ClabureDB: Classified Bug-Reports Database

    /*
     * Core routines and tables shareable across OS platforms.
     *
     * Copyright (c) 1994-2002 Justin T. Gibbs.
     * Copyright (c) 2000-2003 Adaptec Inc.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * Alternatively, this software may be distributed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    * NO WARRANTY
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    * POSSIBILITY OF SUCH DAMAGES.
    *
    * $Id: //depot/aic7xxx/aic7xxx/aic79xx.c#250 $
    */
   
   #ifdef __linux__
   #include "aic79xx_osm.h"
   #include "aic79xx_inline.h"
   #include "aicasm/aicasm_insformat.h"
   #else
   #include <dev/aic7xxx/aic79xx_osm.h>
   #include <dev/aic7xxx/aic79xx_inline.h>
   #include <dev/aic7xxx/aicasm/aicasm_insformat.h>
   #endif
   
   
   /***************************** Lookup Tables **********************************/
   static const char *const ahd_chip_names[] =
   {
           "NONE",
           "aic7901",
           "aic7902",
           "aic7901A"
   };
   static const u_int num_chip_names = ARRAY_SIZE(ahd_chip_names);
   
   /*
    * Hardware error codes.
    */
   struct ahd_hard_error_entry {
           uint8_t errno;
           const char *errmesg;
   };
   
   static const struct ahd_hard_error_entry ahd_hard_errors[] = {
           { DSCTMOUT,        "Discard Timer has timed out" },
           { ILLOPCODE,        "Illegal Opcode in sequencer program" },
           { SQPARERR,        "Sequencer Parity Error" },
           { DPARERR,        "Data-path Parity Error" },
           { MPARERR,        "Scratch or SCB Memory Parity Error" },
           { CIOPARERR,        "CIOBUS Parity Error" },
   };
   static const u_int num_errors = ARRAY_SIZE(ahd_hard_errors);
   
   static const struct ahd_phase_table_entry ahd_phase_table[] =
   {
           { P_DATAOUT,        MSG_NOOP,                "in Data-out phase"        },
           { P_DATAIN,        MSG_INITIATOR_DET_ERR,        "in Data-in phase"        },
           { P_DATAOUT_DT,        MSG_NOOP,                "in DT Data-out phase"        },
           { P_DATAIN_DT,        MSG_INITIATOR_DET_ERR,        "in DT Data-in phase"        },
           { P_COMMAND,        MSG_NOOP,                "in Command phase"        },
           { P_MESGOUT,        MSG_NOOP,                "in Message-out phase"        },
           { P_STATUS,        MSG_INITIATOR_DET_ERR,        "in Status phase"        },
           { P_MESGIN,        MSG_PARITY_ERROR,        "in Message-in phase"        },
           { P_BUSFREE,        MSG_NOOP,                "while idle"                },
           { 0,                MSG_NOOP,                "in unknown phase"        }
   };
   
   /*
    * In most cases we only wish to itterate over real phases, so
    * exclude the last element from the count.
    */
  static const u_int num_phases = ARRAY_SIZE(ahd_phase_table) - 1;
  
  /* Our Sequencer Program */
  #include "aic79xx_seq.h"
  
  /**************************** Function Declarations ***************************/
  static void                ahd_handle_transmission_error(struct ahd_softc *ahd);
  static void                ahd_handle_lqiphase_error(struct ahd_softc *ahd,
                                                    u_int lqistat1);
  static int                ahd_handle_pkt_busfree(struct ahd_softc *ahd,
                                                 u_int busfreetime);
  static int                ahd_handle_nonpkt_busfree(struct ahd_softc *ahd);
  static void                ahd_handle_proto_violation(struct ahd_softc *ahd);
  static void                ahd_force_renegotiation(struct ahd_softc *ahd,
                                                  struct ahd_devinfo *devinfo);
  
  static struct ahd_tmode_tstate*
                          ahd_alloc_tstate(struct ahd_softc *ahd,
                                           u_int scsi_id, char channel);
  #ifdef AHD_TARGET_MODE
  static void                ahd_free_tstate(struct ahd_softc *ahd,
                                          u_int scsi_id, char channel, int force);
  #endif
  static void                ahd_devlimited_syncrate(struct ahd_softc *ahd,
                                                  struct ahd_initiator_tinfo *,
                                                  u_int *period,
                                                  u_int *ppr_options,
                                                  role_t role);
  static void                ahd_update_neg_table(struct ahd_softc *ahd,
                                               struct ahd_devinfo *devinfo,
                                               struct ahd_transinfo *tinfo);
  static void                ahd_update_pending_scbs(struct ahd_softc *ahd);
  static void                ahd_fetch_devinfo(struct ahd_softc *ahd,
                                            struct ahd_devinfo *devinfo);
  static void                ahd_scb_devinfo(struct ahd_softc *ahd,
                                          struct ahd_devinfo *devinfo,
                                          struct scb *scb);
  static void                ahd_setup_initiator_msgout(struct ahd_softc *ahd,
                                                     struct ahd_devinfo *devinfo,
                                                     struct scb *scb);
  static void                ahd_build_transfer_msg(struct ahd_softc *ahd,
                                                 struct ahd_devinfo *devinfo);
  static void                ahd_construct_sdtr(struct ahd_softc *ahd,
                                             struct ahd_devinfo *devinfo,
                                             u_int period, u_int offset);
  static void                ahd_construct_wdtr(struct ahd_softc *ahd,
                                             struct ahd_devinfo *devinfo,
                                             u_int bus_width);
  static void                ahd_construct_ppr(struct ahd_softc *ahd,
                                            struct ahd_devinfo *devinfo,
                                            u_int period, u_int offset,
                                            u_int bus_width, u_int ppr_options);
  static void                ahd_clear_msg_state(struct ahd_softc *ahd);
  static void                ahd_handle_message_phase(struct ahd_softc *ahd);
  typedef enum {
          AHDMSG_1B,
          AHDMSG_2B,
          AHDMSG_EXT
  } ahd_msgtype;
  static int                ahd_sent_msg(struct ahd_softc *ahd, ahd_msgtype type,
                                       u_int msgval, int full);
  static int                ahd_parse_msg(struct ahd_softc *ahd,
                                        struct ahd_devinfo *devinfo);
  static int                ahd_handle_msg_reject(struct ahd_softc *ahd,
                                                struct ahd_devinfo *devinfo);
  static void                ahd_handle_ign_wide_residue(struct ahd_softc *ahd,
                                                  struct ahd_devinfo *devinfo);
  static void                ahd_reinitialize_dataptrs(struct ahd_softc *ahd);
  static void                ahd_handle_devreset(struct ahd_softc *ahd,
                                              struct ahd_devinfo *devinfo,
                                              u_int lun, cam_status status,
                                              char *message, int verbose_level);
  #ifdef AHD_TARGET_MODE
  static void                ahd_setup_target_msgin(struct ahd_softc *ahd,
                                                 struct ahd_devinfo *devinfo,
                                                 struct scb *scb);
  #endif
  
  static u_int                ahd_sglist_size(struct ahd_softc *ahd);
  static u_int                ahd_sglist_allocsize(struct ahd_softc *ahd);
  static bus_dmamap_callback_t
                          ahd_dmamap_cb; 
  static void                ahd_initialize_hscbs(struct ahd_softc *ahd);
  static int                ahd_init_scbdata(struct ahd_softc *ahd);
  static void                ahd_fini_scbdata(struct ahd_softc *ahd);
  static void                ahd_setup_iocell_workaround(struct ahd_softc *ahd);
  static void                ahd_iocell_first_selection(struct ahd_softc *ahd);
  static void                ahd_add_col_list(struct ahd_softc *ahd,
                                           struct scb *scb, u_int col_idx);
  static void                ahd_rem_col_list(struct ahd_softc *ahd,
                                           struct scb *scb);
  static void                ahd_chip_init(struct ahd_softc *ahd);
  static void                ahd_qinfifo_requeue(struct ahd_softc *ahd,
                                              struct scb *prev_scb,
                                              struct scb *scb);
  static int                ahd_qinfifo_count(struct ahd_softc *ahd);
  static int                ahd_search_scb_list(struct ahd_softc *ahd, int target,
                                              char channel, int lun, u_int tag,
                                              role_t role, uint32_t status,
                                              ahd_search_action action,
                                              u_int *list_head, u_int *list_tail,
                                              u_int tid);
  static void                ahd_stitch_tid_list(struct ahd_softc *ahd,
                                              u_int tid_prev, u_int tid_cur,
                                              u_int tid_next);
  static void                ahd_add_scb_to_free_list(struct ahd_softc *ahd,
                                                   u_int scbid);
  static u_int                ahd_rem_wscb(struct ahd_softc *ahd, u_int scbid,
                                       u_int prev, u_int next, u_int tid);
  static void                ahd_reset_current_bus(struct ahd_softc *ahd);
  static ahd_callback_t        ahd_stat_timer;
  #ifdef AHD_DUMP_SEQ
  static void                ahd_dumpseq(struct ahd_softc *ahd);
  #endif
  static void                ahd_loadseq(struct ahd_softc *ahd);
  static int                ahd_check_patch(struct ahd_softc *ahd,
                                          const struct patch **start_patch,
                                          u_int start_instr, u_int *skip_addr);
  static u_int                ahd_resolve_seqaddr(struct ahd_softc *ahd,
                                              u_int address);
  static void                ahd_download_instr(struct ahd_softc *ahd,
                                             u_int instrptr, uint8_t *dconsts);
  static int                ahd_probe_stack_size(struct ahd_softc *ahd);
  static int                ahd_scb_active_in_fifo(struct ahd_softc *ahd,
                                                 struct scb *scb);
  static void                ahd_run_data_fifo(struct ahd_softc *ahd,
                                            struct scb *scb);
  
  #ifdef AHD_TARGET_MODE
  static void                ahd_queue_lstate_event(struct ahd_softc *ahd,
                                                 struct ahd_tmode_lstate *lstate,
                                                 u_int initiator_id,
                                                 u_int event_type,
                                                 u_int event_arg);
  static void                ahd_update_scsiid(struct ahd_softc *ahd,
                                            u_int targid_mask);
  static int                ahd_handle_target_cmd(struct ahd_softc *ahd,
                                                struct target_cmd *cmd);
  #endif
  
  static int                ahd_abort_scbs(struct ahd_softc *ahd, int target,
                                         char channel, int lun, u_int tag,
                                         role_t role, uint32_t status);
  static void                ahd_alloc_scbs(struct ahd_softc *ahd);
  static void                ahd_busy_tcl(struct ahd_softc *ahd, u_int tcl,
                                       u_int scbid);
  static void                ahd_calc_residual(struct ahd_softc *ahd,
                                            struct scb *scb);
  static void                ahd_clear_critical_section(struct ahd_softc *ahd);
  static void                ahd_clear_intstat(struct ahd_softc *ahd);
  static void                ahd_enable_coalescing(struct ahd_softc *ahd,
                                                int enable);
  static u_int                ahd_find_busy_tcl(struct ahd_softc *ahd, u_int tcl);
  static void                ahd_freeze_devq(struct ahd_softc *ahd,
                                          struct scb *scb);
  static void                ahd_handle_scb_status(struct ahd_softc *ahd,
                                                struct scb *scb);
  static const struct ahd_phase_table_entry* ahd_lookup_phase_entry(int phase);
  static void                ahd_shutdown(void *arg);
  static void                ahd_update_coalescing_values(struct ahd_softc *ahd,
                                                       u_int timer,
                                                       u_int maxcmds,
                                                       u_int mincmds);
  static int                ahd_verify_vpd_cksum(struct vpd_config *vpd);
  static int                ahd_wait_seeprom(struct ahd_softc *ahd);
  static int                ahd_match_scb(struct ahd_softc *ahd, struct scb *scb,
                                        int target, char channel, int lun,
                                        u_int tag, role_t role);
  
  static void                ahd_reset_cmds_pending(struct ahd_softc *ahd);
  
  /*************************** Interrupt Services *******************************/
  static void                ahd_run_qoutfifo(struct ahd_softc *ahd);
  #ifdef AHD_TARGET_MODE
  static void                ahd_run_tqinfifo(struct ahd_softc *ahd, int paused);
  #endif
  static void                ahd_handle_hwerrint(struct ahd_softc *ahd);
  static void                ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat);
  static void                ahd_handle_scsiint(struct ahd_softc *ahd,
                                             u_int intstat);
  
  /************************ Sequencer Execution Control *************************/
  void
  ahd_set_modes(struct ahd_softc *ahd, ahd_mode src, ahd_mode dst)
  {
          if (ahd->src_mode == src && ahd->dst_mode == dst)
                  return;
  #ifdef AHD_DEBUG
          if (ahd->src_mode == AHD_MODE_UNKNOWN
           || ahd->dst_mode == AHD_MODE_UNKNOWN)
                  panic("Setting mode prior to saving it.\n");
          if ((ahd_debug & AHD_SHOW_MODEPTR) != 0)
                  printf("%s: Setting mode 0x%x\n", ahd_name(ahd),
                         ahd_build_mode_state(ahd, src, dst));
  #endif
          ahd_outb(ahd, MODE_PTR, ahd_build_mode_state(ahd, src, dst));
          ahd->src_mode = src;
          ahd->dst_mode = dst;
  }
  
  static void
  ahd_update_modes(struct ahd_softc *ahd)
  {
          ahd_mode_state mode_ptr;
          ahd_mode src;
          ahd_mode dst;
  
          mode_ptr = ahd_inb(ahd, MODE_PTR);
  #ifdef AHD_DEBUG
          if ((ahd_debug & AHD_SHOW_MODEPTR) != 0)
                  printf("Reading mode 0x%x\n", mode_ptr);
  #endif
          ahd_extract_mode_state(ahd, mode_ptr, &src, &dst);
          ahd_known_modes(ahd, src, dst);
  }
  
  static void
  ahd_assert_modes(struct ahd_softc *ahd, ahd_mode srcmode,
                   ahd_mode dstmode, const char *file, int line)
  {
  #ifdef AHD_DEBUG
          if ((srcmode & AHD_MK_MSK(ahd->src_mode)) == 0
           || (dstmode & AHD_MK_MSK(ahd->dst_mode)) == 0) {
                  panic("%s:%s:%d: Mode assertion failed.\n",
                         ahd_name(ahd), file, line);
          }
  #endif
  }
  
  #define AHD_ASSERT_MODES(ahd, source, dest) \
          ahd_assert_modes(ahd, source, dest, __FILE__, __LINE__);
  
  ahd_mode_state
  ahd_save_modes(struct ahd_softc *ahd)
  {
          if (ahd->src_mode == AHD_MODE_UNKNOWN
           || ahd->dst_mode == AHD_MODE_UNKNOWN)
                  ahd_update_modes(ahd);
  
          return (ahd_build_mode_state(ahd, ahd->src_mode, ahd->dst_mode));
  }
  
  void
  ahd_restore_modes(struct ahd_softc *ahd, ahd_mode_state state)
  {
          ahd_mode src;
          ahd_mode dst;
  
          ahd_extract_mode_state(ahd, state, &src, &dst);
          ahd_set_modes(ahd, src, dst);
  }
  
  /*
   * Determine whether the sequencer has halted code execution.
   * Returns non-zero status if the sequencer is stopped.
   */
  int
  ahd_is_paused(struct ahd_softc *ahd)
  {
          return ((ahd_inb(ahd, HCNTRL) & PAUSE) != 0);
  }
  
  /*
   * Request that the sequencer stop and wait, indefinitely, for it
   * to stop.  The sequencer will only acknowledge that it is paused
   * once it has reached an instruction boundary and PAUSEDIS is
   * cleared in the SEQCTL register.  The sequencer may use PAUSEDIS
   * for critical sections.
   */
  void
  ahd_pause(struct ahd_softc *ahd)
  {
          ahd_outb(ahd, HCNTRL, ahd->pause);
  
          /*
           * Since the sequencer can disable pausing in a critical section, we
           * must loop until it actually stops.
           */
          while (ahd_is_paused(ahd) == 0)
                  ;
  }
  
  /*
   * Allow the sequencer to continue program execution.
   * We check here to ensure that no additional interrupt
   * sources that would cause the sequencer to halt have been
   * asserted.  If, for example, a SCSI bus reset is detected
   * while we are fielding a different, pausing, interrupt type,
   * we don't want to release the sequencer before going back
   * into our interrupt handler and dealing with this new
   * condition.
   */
  void
  ahd_unpause(struct ahd_softc *ahd)
  {
          /*
           * Automatically restore our modes to those saved
           * prior to the first change of the mode.
           */
          if (ahd->saved_src_mode != AHD_MODE_UNKNOWN
           && ahd->saved_dst_mode != AHD_MODE_UNKNOWN) {
                  if ((ahd->flags & AHD_UPDATE_PEND_CMDS) != 0)
                          ahd_reset_cmds_pending(ahd);
                  ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
          }
  
          if ((ahd_inb(ahd, INTSTAT) & ~CMDCMPLT) == 0)
                  ahd_outb(ahd, HCNTRL, ahd->unpause);
  
          ahd_known_modes(ahd, AHD_MODE_UNKNOWN, AHD_MODE_UNKNOWN);
  }
  
  /*********************** Scatter Gather List Handling *************************/
  void *
  ahd_sg_setup(struct ahd_softc *ahd, struct scb *scb,
               void *sgptr, dma_addr_t addr, bus_size_t len, int last)
  {
          scb->sg_count++;
          if (sizeof(dma_addr_t) > 4
           && (ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                  struct ahd_dma64_seg *sg;
  
                  sg = (struct ahd_dma64_seg *)sgptr;
                  sg->addr = ahd_htole64(addr);
                  sg->len = ahd_htole32(len | (last ? AHD_DMA_LAST_SEG : 0));
                  return (sg + 1);
          } else {
                  struct ahd_dma_seg *sg;
  
                  sg = (struct ahd_dma_seg *)sgptr;
                  sg->addr = ahd_htole32(addr & 0xFFFFFFFF);
                  sg->len = ahd_htole32(len | ((addr >> 8) & 0x7F000000)
                                      | (last ? AHD_DMA_LAST_SEG : 0));
                  return (sg + 1);
          }
  }
  
  static void
  ahd_setup_scb_common(struct ahd_softc *ahd, struct scb *scb)
  {
          /* XXX Handle target mode SCBs. */
          scb->crc_retry_count = 0;
          if ((scb->flags & SCB_PACKETIZED) != 0) {
                  /* XXX what about ACA??  It is type 4, but TAG_TYPE == 0x3. */
                  scb->hscb->task_attribute = scb->hscb->control & SCB_TAG_TYPE;
          } else {
                  if (ahd_get_transfer_length(scb) & 0x01)
                          scb->hscb->task_attribute = SCB_XFERLEN_ODD;
                  else
                          scb->hscb->task_attribute = 0;
          }
  
          if (scb->hscb->cdb_len <= MAX_CDB_LEN_WITH_SENSE_ADDR
           || (scb->hscb->cdb_len & SCB_CDB_LEN_PTR) != 0)
                  scb->hscb->shared_data.idata.cdb_plus_saddr.sense_addr =
                      ahd_htole32(scb->sense_busaddr);
  }
  
  static void
  ahd_setup_data_scb(struct ahd_softc *ahd, struct scb *scb)
  {
          /*
           * Copy the first SG into the "current" data ponter area.
           */
          if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                  struct ahd_dma64_seg *sg;
  
                  sg = (struct ahd_dma64_seg *)scb->sg_list;
                  scb->hscb->dataptr = sg->addr;
                  scb->hscb->datacnt = sg->len;
          } else {
                  struct ahd_dma_seg *sg;
                  uint32_t *dataptr_words;
  
                  sg = (struct ahd_dma_seg *)scb->sg_list;
                  dataptr_words = (uint32_t*)&scb->hscb->dataptr;
                  dataptr_words[0] = sg->addr;
                  dataptr_words[1] = 0;
                  if ((ahd->flags & AHD_39BIT_ADDRESSING) != 0) {
                          uint64_t high_addr;
  
                          high_addr = ahd_le32toh(sg->len) & 0x7F000000;
                          scb->hscb->dataptr |= ahd_htole64(high_addr << 8);
                  }
                  scb->hscb->datacnt = sg->len;
          }
          /*
           * Note where to find the SG entries in bus space.
           * We also set the full residual flag which the
           * sequencer will clear as soon as a data transfer
           * occurs.
           */
          scb->hscb->sgptr = ahd_htole32(scb->sg_list_busaddr|SG_FULL_RESID);
  }
  
  static void
  ahd_setup_noxfer_scb(struct ahd_softc *ahd, struct scb *scb)
  {
          scb->hscb->sgptr = ahd_htole32(SG_LIST_NULL);
          scb->hscb->dataptr = 0;
          scb->hscb->datacnt = 0;
  }
  
  /************************** Memory mapping routines ***************************/
  static void *
  ahd_sg_bus_to_virt(struct ahd_softc *ahd, struct scb *scb, uint32_t sg_busaddr)
  {
          dma_addr_t sg_offset;
  
          /* sg_list_phys points to entry 1, not 0 */
          sg_offset = sg_busaddr - (scb->sg_list_busaddr - ahd_sg_size(ahd));
          return ((uint8_t *)scb->sg_list + sg_offset);
  }
  
  static uint32_t
  ahd_sg_virt_to_bus(struct ahd_softc *ahd, struct scb *scb, void *sg)
  {
          dma_addr_t sg_offset;
  
          /* sg_list_phys points to entry 1, not 0 */
          sg_offset = ((uint8_t *)sg - (uint8_t *)scb->sg_list)
                    - ahd_sg_size(ahd);
  
          return (scb->sg_list_busaddr + sg_offset);
  }
  
  static void
  ahd_sync_scb(struct ahd_softc *ahd, struct scb *scb, int op)
  {
          ahd_dmamap_sync(ahd, ahd->scb_data.hscb_dmat,
                          scb->hscb_map->dmamap,
                          /*offset*/(uint8_t*)scb->hscb - scb->hscb_map->vaddr,
                          /*len*/sizeof(*scb->hscb), op);
  }
  
  void
  ahd_sync_sglist(struct ahd_softc *ahd, struct scb *scb, int op)
  {
          if (scb->sg_count == 0)
                  return;
  
          ahd_dmamap_sync(ahd, ahd->scb_data.sg_dmat,
                          scb->sg_map->dmamap,
                          /*offset*/scb->sg_list_busaddr - ahd_sg_size(ahd),
                          /*len*/ahd_sg_size(ahd) * scb->sg_count, op);
  }
  
  static void
  ahd_sync_sense(struct ahd_softc *ahd, struct scb *scb, int op)
  {
          ahd_dmamap_sync(ahd, ahd->scb_data.sense_dmat,
                          scb->sense_map->dmamap,
                          /*offset*/scb->sense_busaddr,
                          /*len*/AHD_SENSE_BUFSIZE, op);
  }
  
  #ifdef AHD_TARGET_MODE
  static uint32_t
  ahd_targetcmd_offset(struct ahd_softc *ahd, u_int index)
  {
          return (((uint8_t *)&ahd->targetcmds[index])
                 - (uint8_t *)ahd->qoutfifo);
  }
  #endif
  
  /*********************** Miscelaneous Support Functions ***********************/
  /*
   * Return pointers to the transfer negotiation information
   * for the specified our_id/remote_id pair.
   */
  struct ahd_initiator_tinfo *
  ahd_fetch_transinfo(struct ahd_softc *ahd, char channel, u_int our_id,
                      u_int remote_id, struct ahd_tmode_tstate **tstate)
  {
          /*
           * Transfer data structures are stored from the perspective
           * of the target role.  Since the parameters for a connection
           * in the initiator role to a given target are the same as
           * when the roles are reversed, we pretend we are the target.
           */
          if (channel == 'B')
                  our_id += 8;
          *tstate = ahd->enabled_targets[our_id];
          return (&(*tstate)->transinfo[remote_id]);
  }
  
  uint16_t
  ahd_inw(struct ahd_softc *ahd, u_int port)
  {
          /*
           * Read high byte first as some registers increment
           * or have other side effects when the low byte is
           * read.
           */
          uint16_t r = ahd_inb(ahd, port+1) << 8;
          return r | ahd_inb(ahd, port);
  }
  
  void
  ahd_outw(struct ahd_softc *ahd, u_int port, u_int value)
  {
          /*
           * Write low byte first to accomodate registers
           * such as PRGMCNT where the order maters.
           */
          ahd_outb(ahd, port, value & 0xFF);
          ahd_outb(ahd, port+1, (value >> 8) & 0xFF);
  }
  
  uint32_t
  ahd_inl(struct ahd_softc *ahd, u_int port)
  {
          return ((ahd_inb(ahd, port))
                | (ahd_inb(ahd, port+1) << 8)
                | (ahd_inb(ahd, port+2) << 16)
                | (ahd_inb(ahd, port+3) << 24));
  }
  
  void
  ahd_outl(struct ahd_softc *ahd, u_int port, uint32_t value)
  {
          ahd_outb(ahd, port, (value) & 0xFF);
          ahd_outb(ahd, port+1, ((value) >> 8) & 0xFF);
          ahd_outb(ahd, port+2, ((value) >> 16) & 0xFF);
          ahd_outb(ahd, port+3, ((value) >> 24) & 0xFF);
  }
  
  uint64_t
  ahd_inq(struct ahd_softc *ahd, u_int port)
  {
          return ((ahd_inb(ahd, port))
                | (ahd_inb(ahd, port+1) << 8)
                | (ahd_inb(ahd, port+2) << 16)
                | (ahd_inb(ahd, port+3) << 24)
                | (((uint64_t)ahd_inb(ahd, port+4)) << 32)
                | (((uint64_t)ahd_inb(ahd, port+5)) << 40)
                | (((uint64_t)ahd_inb(ahd, port+6)) << 48)
                | (((uint64_t)ahd_inb(ahd, port+7)) << 56));
  }
  
  void
  ahd_outq(struct ahd_softc *ahd, u_int port, uint64_t value)
  {
          ahd_outb(ahd, port, value & 0xFF);
          ahd_outb(ahd, port+1, (value >> 8) & 0xFF);
          ahd_outb(ahd, port+2, (value >> 16) & 0xFF);
          ahd_outb(ahd, port+3, (value >> 24) & 0xFF);
          ahd_outb(ahd, port+4, (value >> 32) & 0xFF);
          ahd_outb(ahd, port+5, (value >> 40) & 0xFF);
          ahd_outb(ahd, port+6, (value >> 48) & 0xFF);
          ahd_outb(ahd, port+7, (value >> 56) & 0xFF);
  }
  
  u_int
  ahd_get_scbptr(struct ahd_softc *ahd)
  {
          AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                           ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
          return (ahd_inb(ahd, SCBPTR) | (ahd_inb(ahd, SCBPTR + 1) << 8));
  }
  
  void
  ahd_set_scbptr(struct ahd_softc *ahd, u_int scbptr)
  {
          AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                           ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
          ahd_outb(ahd, SCBPTR, scbptr & 0xFF);
          ahd_outb(ahd, SCBPTR+1, (scbptr >> 8) & 0xFF);
  }
  
  #if 0 /* unused */
  static u_int
  ahd_get_hnscb_qoff(struct ahd_softc *ahd)
  {
          return (ahd_inw_atomic(ahd, HNSCB_QOFF));
  }
  #endif
  
  static void
  ahd_set_hnscb_qoff(struct ahd_softc *ahd, u_int value)
  {
          ahd_outw_atomic(ahd, HNSCB_QOFF, value);
  }
  
  #if 0 /* unused */
  static u_int
  ahd_get_hescb_qoff(struct ahd_softc *ahd)
  {
          return (ahd_inb(ahd, HESCB_QOFF));
  }
  #endif
  
  static void
  ahd_set_hescb_qoff(struct ahd_softc *ahd, u_int value)
  {
          ahd_outb(ahd, HESCB_QOFF, value);
  }
  
  static u_int
  ahd_get_snscb_qoff(struct ahd_softc *ahd)
  {
          u_int oldvalue;
  
          AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
          oldvalue = ahd_inw(ahd, SNSCB_QOFF);
          ahd_outw(ahd, SNSCB_QOFF, oldvalue);
          return (oldvalue);
  }
  
  static void
  ahd_set_snscb_qoff(struct ahd_softc *ahd, u_int value)
  {
          AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
          ahd_outw(ahd, SNSCB_QOFF, value);
  }
  
  #if 0 /* unused */
  static u_int
  ahd_get_sescb_qoff(struct ahd_softc *ahd)
  {
          AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
          return (ahd_inb(ahd, SESCB_QOFF));
  }
  #endif
  
  static void
  ahd_set_sescb_qoff(struct ahd_softc *ahd, u_int value)
  {
          AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
          ahd_outb(ahd, SESCB_QOFF, value);
  }
  
  #if 0 /* unused */
  static u_int
  ahd_get_sdscb_qoff(struct ahd_softc *ahd)
  {
          AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
          return (ahd_inb(ahd, SDSCB_QOFF) | (ahd_inb(ahd, SDSCB_QOFF + 1) << 8));
  }
  #endif
  
  static void
  ahd_set_sdscb_qoff(struct ahd_softc *ahd, u_int value)
  {
          AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
          ahd_outb(ahd, SDSCB_QOFF, value & 0xFF);
          ahd_outb(ahd, SDSCB_QOFF+1, (value >> 8) & 0xFF);
  }
  
  u_int
  ahd_inb_scbram(struct ahd_softc *ahd, u_int offset)
  {
          u_int value;
  
          /*
           * Workaround PCI-X Rev A. hardware bug.
           * After a host read of SCB memory, the chip
           * may become confused into thinking prefetch
           * was required.  This starts the discard timer
           * running and can cause an unexpected discard
           * timer interrupt.  The work around is to read
           * a normal register prior to the exhaustion of
           * the discard timer.  The mode pointer register
           * has no side effects and so serves well for
           * this purpose.
           *
           * Razor #528
           */
          value = ahd_inb(ahd, offset);
          if ((ahd->bugs & AHD_PCIX_SCBRAM_RD_BUG) != 0)
                  ahd_inb(ahd, MODE_PTR);
          return (value);
  }
  
  u_int
  ahd_inw_scbram(struct ahd_softc *ahd, u_int offset)
  {
          return (ahd_inb_scbram(ahd, offset)
                | (ahd_inb_scbram(ahd, offset+1) << 8));
  }
  
  static uint32_t
  ahd_inl_scbram(struct ahd_softc *ahd, u_int offset)
  {
          return (ahd_inw_scbram(ahd, offset)
                | (ahd_inw_scbram(ahd, offset+2) << 16));
  }
  
  static uint64_t
  ahd_inq_scbram(struct ahd_softc *ahd, u_int offset)
  {
          return (ahd_inl_scbram(ahd, offset)
                | ((uint64_t)ahd_inl_scbram(ahd, offset+4)) << 32);
  }
  
  struct scb *
  ahd_lookup_scb(struct ahd_softc *ahd, u_int tag)
  {
          struct scb* scb;
  
          if (tag >= AHD_SCB_MAX)
                  return (NULL);
          scb = ahd->scb_data.scbindex[tag];
          if (scb != NULL)
                  ahd_sync_scb(ahd, scb,
                               BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
          return (scb);
  }
  
  static void
  ahd_swap_with_next_hscb(struct ahd_softc *ahd, struct scb *scb)
  {
          struct         hardware_scb *q_hscb;
          struct         map_node *q_hscb_map;
          uint32_t saved_hscb_busaddr;
  
          /*
           * Our queuing method is a bit tricky.  The card
           * knows in advance which HSCB (by address) to download,
           * and we can't disappoint it.  To achieve this, the next
           * HSCB to download is saved off in ahd->next_queued_hscb.
           * When we are called to queue "an arbitrary scb",
           * we copy the contents of the incoming HSCB to the one
           * the sequencer knows about, swap HSCB pointers and
           * finally assign the SCB to the tag indexed location
           * in the scb_array.  This makes sure that we can still
           * locate the correct SCB by SCB_TAG.
           */
          q_hscb = ahd->next_queued_hscb;
          q_hscb_map = ahd->next_queued_hscb_map;
          saved_hscb_busaddr = q_hscb->hscb_busaddr;
          memcpy(q_hscb, scb->hscb, sizeof(*scb->hscb));
          q_hscb->hscb_busaddr = saved_hscb_busaddr;
          q_hscb->next_hscb_busaddr = scb->hscb->hscb_busaddr;
  
          /* Now swap HSCB pointers. */
          ahd->next_queued_hscb = scb->hscb;
          ahd->next_queued_hscb_map = scb->hscb_map;
          scb->hscb = q_hscb;
          scb->hscb_map = q_hscb_map;
  
          /* Now define the mapping from tag to SCB in the scbindex */
          ahd->scb_data.scbindex[SCB_GET_TAG(scb)] = scb;
  }
  
  /*
   * Tell the sequencer about a new transaction to execute.
   */
  void
  ahd_queue_scb(struct ahd_softc *ahd, struct scb *scb)
  {
          ahd_swap_with_next_hscb(ahd, scb);
  
          if (SCBID_IS_NULL(SCB_GET_TAG(scb)))
                  panic("Attempt to queue invalid SCB tag %x\n",
                        SCB_GET_TAG(scb));
  
          /*
           * Keep a history of SCBs we've downloaded in the qinfifo.
           */
          ahd->qinfifo[AHD_QIN_WRAP(ahd->qinfifonext)] = SCB_GET_TAG(scb);
          ahd->qinfifonext++;
  
          if (scb->sg_count != 0)
                  ahd_setup_data_scb(ahd, scb);
          else
                  ahd_setup_noxfer_scb(ahd, scb);
          ahd_setup_scb_common(ahd, scb);
  
          /*
           * Make sure our data is consistent from the
           * perspective of the adapter.
           */
          ahd_sync_scb(ahd, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
  
  #ifdef AHD_DEBUG
          if ((ahd_debug & AHD_SHOW_QUEUE) != 0) {
                  uint64_t host_dataptr;
  
                  host_dataptr = ahd_le64toh(scb->hscb->dataptr);
                  printf("%s: Queueing SCB %d:0x%x bus addr 0x%x - 0x%x%x/0x%x\n",
                         ahd_name(ahd),
                         SCB_GET_TAG(scb), scb->hscb->scsiid,
                         ahd_le32toh(scb->hscb->hscb_busaddr),
                         (u_int)((host_dataptr >> 32) & 0xFFFFFFFF),
                         (u_int)(host_dataptr & 0xFFFFFFFF),
                         ahd_le32toh(scb->hscb->datacnt));
          }
  #endif
          /* Tell the adapter about the newly queued SCB */
          ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
  }
  
  /************************** Interrupt Processing ******************************/
  static void
  ahd_sync_qoutfifo(struct ahd_softc *ahd, int op)
  {
          ahd_dmamap_sync(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
                          /*offset*/0,
                          /*len*/AHD_SCB_MAX * sizeof(struct ahd_completion), op);
  }
  
  static void
  ahd_sync_tqinfifo(struct ahd_softc *ahd, int op)
  {
  #ifdef AHD_TARGET_MODE
          if ((ahd->flags & AHD_TARGETROLE) != 0) {
                  ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
                                  ahd->shared_data_map.dmamap,
                                  ahd_targetcmd_offset(ahd, 0),
                                  sizeof(struct target_cmd) * AHD_TMODE_CMDS,
                                  op);
          }
  #endif
  }
  
  /*
   * See if the firmware has posted any completed commands
   * into our in-core command complete fifos.
   */
  #define AHD_RUN_QOUTFIFO 0x1
  #define AHD_RUN_TQINFIFO 0x2
  static u_int
  ahd_check_cmdcmpltqueues(struct ahd_softc *ahd)
  {
          u_int retval;
  
          retval = 0;
          ahd_dmamap_sync(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
                          /*offset*/ahd->qoutfifonext * sizeof(*ahd->qoutfifo),
                          /*len*/sizeof(*ahd->qoutfifo), BUS_DMASYNC_POSTREAD);
          if (ahd->qoutfifo[ahd->qoutfifonext].valid_tag
            == ahd->qoutfifonext_valid_tag)
                  retval |= AHD_RUN_QOUTFIFO;
  #ifdef AHD_TARGET_MODE
          if ((ahd->flags & AHD_TARGETROLE) != 0
           && (ahd->flags & AHD_TQINFIFO_BLOCKED) == 0) {
                  ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
                                  ahd->shared_data_map.dmamap,
                                  ahd_targetcmd_offset(ahd, ahd->tqinfifofnext),
                                  /*len*/sizeof(struct target_cmd),
                                  BUS_DMASYNC_POSTREAD);
                  if (ahd->targetcmds[ahd->tqinfifonext].cmd_valid != 0)
                          retval |= AHD_RUN_TQINFIFO;
          }
  #endif
          return (retval);
  }
  
  /*
   * Catch an interrupt from the adapter
   */
  int
  ahd_intr(struct ahd_softc *ahd)
  {
          u_int        intstat;
  
          if ((ahd->pause & INTEN) == 0) {
                  /*
                   * Our interrupt is not enabled on the chip
                   * and may be disabled for re-entrancy reasons,
                   * so just return.  This is likely just a shared
                   * interrupt.
                   */
                  return (0);
          }
  
          /*
           * Instead of directly reading the interrupt status register,
           * infer the cause of the interrupt by checking our in-core
           * completion queues.  This avoids a costly PCI bus read in
           * most cases.
           */
          if ((ahd->flags & AHD_ALL_INTERRUPTS) == 0
           && (ahd_check_cmdcmpltqueues(ahd) != 0))
                  intstat = CMDCMPLT;
          else
                  intstat = ahd_inb(ahd, INTSTAT);
  
          if ((intstat & INT_PEND) == 0)
                  return (0);
  
          if (intstat & CMDCMPLT) {
                  ahd_outb(ahd, CLRINT, CLRCMDINT);
  
                  /*
                   * Ensure that the chip sees that we've cleared
                   * this interrupt before we walk the output fifo.
                   * Otherwise, we may, due to posted bus writes,
                   * clear the interrupt after we finish the scan,
                   * and after the sequencer has added new entries
                   * and asserted the interrupt again.
                   */
                  if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
                          if (ahd_is_paused(ahd)) {
                                  /*
                                   * Potentially lost SEQINT.
                                   * If SEQINTCODE is non-zero,
                                   * simulate the SEQINT.
                                   */
                                 if (ahd_inb(ahd, SEQINTCODE) != NO_SEQINT)
                                         intstat |= SEQINT;
                         }
                 } else {
                         ahd_flush_device_writes(ahd);
                 }
                 ahd_run_qoutfifo(ahd);
                 ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket]++;
                 ahd->cmdcmplt_total++;
 #ifdef AHD_TARGET_MODE
                 if ((ahd->flags & AHD_TARGETROLE) != 0)
                         ahd_run_tqinfifo(ahd, /*paused*/FALSE);
 #endif
         }
 
         /*
          * Handle statuses that may invalidate our cached
          * copy of INTSTAT separately.
          */
         if (intstat == 0xFF && (ahd->features & AHD_REMOVABLE) != 0) {
                 /* Hot eject.  Do nothing */
         } else if (intstat & HWERRINT) {
                 ahd_handle_hwerrint(ahd);
         } else if ((intstat & (PCIINT|SPLTINT)) != 0) {
                 ahd->bus_intr(ahd);
         } else {
 
                 if ((intstat & SEQINT) != 0)
                         ahd_handle_seqint(ahd, intstat);
 
                 if ((intstat & SCSIINT) != 0)
                         ahd_handle_scsiint(ahd, intstat);
         }
         return (1);
 }
 
 /******************************** Private Inlines *****************************/
 static __inline void
 ahd_assert_atn(struct ahd_softc *ahd)
 {
         ahd_outb(ahd, SCSISIGO, ATNO);
 }
 
 /*
  * Determine if the current connection has a packetized
  * agreement.  This does not necessarily mean that we
  * are currently in a packetized transfer.  We could
  * just as easily be sending or receiving a message.
  */
 static int
 ahd_currently_packetized(struct ahd_softc *ahd)
 {
         ahd_mode_state         saved_modes;
         int                 packetized;
 
         saved_modes = ahd_save_modes(ahd);
         if ((ahd->bugs & AHD_PKTIZED_STATUS_BUG) != 0) {
                 /*
                  * The packetized bit refers to the last
                  * connection, not the current one.  Check
                  * for non-zero LQISTATE instead.
                  */
                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
                 packetized = ahd_inb(ahd, LQISTATE) != 0;
         } else {
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                 packetized = ahd_inb(ahd, LQISTAT2) & PACKETIZED;
         }
         ahd_restore_modes(ahd, saved_modes);
         return (packetized);
 }
 
 static __inline int
 ahd_set_active_fifo(struct ahd_softc *ahd)
 {
         u_int active_fifo;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
         active_fifo = ahd_inb(ahd, DFFSTAT) & CURRFIFO;
         switch (active_fifo) {
         case 0:
         case 1:
                 ahd_set_modes(ahd, active_fifo, active_fifo);
                 return (1);
         default:
                 return (0);
         }
 }
 
 static __inline void
 ahd_unbusy_tcl(struct ahd_softc *ahd, u_int tcl)
 {
         ahd_busy_tcl(ahd, tcl, SCB_LIST_NULL);
 }
 
 /*
  * Determine whether the sequencer reported a residual
  * for this SCB/transaction.
  */
 static __inline void
 ahd_update_residual(struct ahd_softc *ahd, struct scb *scb)
 {
         uint32_t sgptr;
 
         sgptr = ahd_le32toh(scb->hscb->sgptr);
         if ((sgptr & SG_STATUS_VALID) != 0)
                 ahd_calc_residual(ahd, scb);
 }
 
 static __inline void
 ahd_complete_scb(struct ahd_softc *ahd, struct scb *scb)
 {
         uint32_t sgptr;
 
         sgptr = ahd_le32toh(scb->hscb->sgptr);
         if ((sgptr & SG_STATUS_VALID) != 0)
                 ahd_handle_scb_status(ahd, scb);
         else
                 ahd_done(ahd, scb);
 }
 
 
 /************************* Sequencer Execution Control ************************/
 /*
  * Restart the sequencer program from address zero
  */
 static void
 ahd_restart(struct ahd_softc *ahd)
 {
 
         ahd_pause(ahd);
 
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         /* No more pending messages */
         ahd_clear_msg_state(ahd);
         ahd_outb(ahd, SCSISIGO, 0);                /* De-assert BSY */
         ahd_outb(ahd, MSG_OUT, MSG_NOOP);        /* No message to send */
         ahd_outb(ahd, SXFRCTL1, ahd_inb(ahd, SXFRCTL1) & ~BITBUCKET);
         ahd_outb(ahd, SEQINTCTL, 0);
         ahd_outb(ahd, LASTPHASE, P_BUSFREE);
         ahd_outb(ahd, SEQ_FLAGS, 0);
         ahd_outb(ahd, SAVED_SCSIID, 0xFF);
         ahd_outb(ahd, SAVED_LUN, 0xFF);
 
         /*
          * Ensure that the sequencer's idea of TQINPOS
          * matches our own.  The sequencer increments TQINPOS
          * only after it sees a DMA complete and a reset could
          * occur before the increment leaving the kernel to believe
          * the command arrived but the sequencer to not.
          */
         ahd_outb(ahd, TQINPOS, ahd->tqinfifonext);
 
         /* Always allow reselection */
         ahd_outb(ahd, SCSISEQ1,
                  ahd_inb(ahd, SCSISEQ_TEMPLATE) & (ENSELI|ENRSELI|ENAUTOATNP));
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
 
         /*
          * Clear any pending sequencer interrupt.  It is no
          * longer relevant since we're resetting the Program
          * Counter.
          */
         ahd_outb(ahd, CLRINT, CLRSEQINT);
 
         ahd_outb(ahd, SEQCTL0, FASTMODE|SEQRESET);
         ahd_unpause(ahd);
 }
 
 static void
 ahd_clear_fifo(struct ahd_softc *ahd, u_int fifo)
 {
         ahd_mode_state         saved_modes;
 
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_FIFOS) != 0)
                 printf("%s: Clearing FIFO %d\n", ahd_name(ahd), fifo);
 #endif
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, fifo, fifo);
         ahd_outb(ahd, DFFSXFRCTL, RSTCHN|CLRSHCNT);
         if ((ahd_inb(ahd, SG_STATE) & FETCH_INPROG) != 0)
                 ahd_outb(ahd, CCSGCTL, CCSGRESET);
         ahd_outb(ahd, LONGJMP_ADDR + 1, INVALID_ADDR);
         ahd_outb(ahd, SG_STATE, 0);
         ahd_restore_modes(ahd, saved_modes);
 }
 
 /************************* Input/Output Queues ********************************/
 /*
  * Flush and completed commands that are sitting in the command
  * complete queues down on the chip but have yet to be dma'ed back up.
  */
 static void
 ahd_flush_qoutfifo(struct ahd_softc *ahd)
 {
         struct                scb *scb;
         ahd_mode_state        saved_modes;
         u_int                saved_scbptr;
         u_int                ccscbctl;
         u_int                scbid;
         u_int                next_scbid;
 
         saved_modes = ahd_save_modes(ahd);
 
         /*
          * Flush the good status FIFO for completed packetized commands.
          */
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         saved_scbptr = ahd_get_scbptr(ahd);
         while ((ahd_inb(ahd, LQISTAT2) & LQIGSAVAIL) != 0) {
                 u_int fifo_mode;
                 u_int i;
                 
                 scbid = ahd_inw(ahd, GSFIFO);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: Warning - GSFIFO SCB %d invalid\n",
                                ahd_name(ahd), scbid);
                         continue;
                 }
                 /*
                  * Determine if this transaction is still active in
                  * any FIFO.  If it is, we must flush that FIFO to
                  * the host before completing the  command.
                  */
                 fifo_mode = 0;
 rescan_fifos:
                 for (i = 0; i < 2; i++) {
                         /* Toggle to the other mode. */
                         fifo_mode ^= 1;
                         ahd_set_modes(ahd, fifo_mode, fifo_mode);
 
                         if (ahd_scb_active_in_fifo(ahd, scb) == 0)
                                 continue;
 
                         ahd_run_data_fifo(ahd, scb);
 
                         /*
                          * Running this FIFO may cause a CFG4DATA for
                          * this same transaction to assert in the other
                          * FIFO or a new snapshot SAVEPTRS interrupt
                          * in this FIFO.  Even running a FIFO may not
                          * clear the transaction if we are still waiting
                          * for data to drain to the host. We must loop
                          * until the transaction is not active in either
                          * FIFO just to be sure.  Reset our loop counter
                          * so we will visit both FIFOs again before
                          * declaring this transaction finished.  We
                          * also delay a bit so that status has a chance
                          * to change before we look at this FIFO again.
                          */
                         ahd_delay(200);
                         goto rescan_fifos;
                 }
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                 ahd_set_scbptr(ahd, scbid);
                 if ((ahd_inb_scbram(ahd, SCB_SGPTR) & SG_LIST_NULL) == 0
                  && ((ahd_inb_scbram(ahd, SCB_SGPTR) & SG_FULL_RESID) != 0
                   || (ahd_inb_scbram(ahd, SCB_RESIDUAL_SGPTR)
                       & SG_LIST_NULL) != 0)) {
                         u_int comp_head;
 
                         /*
                          * The transfer completed with a residual.
                          * Place this SCB on the complete DMA list
                          * so that we update our in-core copy of the
                          * SCB before completing the command.
                          */
                         ahd_outb(ahd, SCB_SCSI_STATUS, 0);
                         ahd_outb(ahd, SCB_SGPTR,
                                  ahd_inb_scbram(ahd, SCB_SGPTR)
                                  | SG_STATUS_VALID);
                         ahd_outw(ahd, SCB_TAG, scbid);
                         ahd_outw(ahd, SCB_NEXT_COMPLETE, SCB_LIST_NULL);
                         comp_head = ahd_inw(ahd, COMPLETE_DMA_SCB_HEAD);
                         if (SCBID_IS_NULL(comp_head)) {
                                 ahd_outw(ahd, COMPLETE_DMA_SCB_HEAD, scbid);
                                 ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, scbid);
                         } else {
                                 u_int tail;
 
                                 tail = ahd_inw(ahd, COMPLETE_DMA_SCB_TAIL);
                                 ahd_set_scbptr(ahd, tail);
                                 ahd_outw(ahd, SCB_NEXT_COMPLETE, scbid);
                                 ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, scbid);
                                 ahd_set_scbptr(ahd, scbid);
                         }
                 } else
                         ahd_complete_scb(ahd, scb);
         }
         ahd_set_scbptr(ahd, saved_scbptr);
 
         /*
          * Setup for command channel portion of flush.
          */
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
 
         /*
          * Wait for any inprogress DMA to complete and clear DMA state
          * if this if for an SCB in the qinfifo.
          */
         while (((ccscbctl = ahd_inb(ahd, CCSCBCTL)) & (CCARREN|CCSCBEN)) != 0) {
 
                 if ((ccscbctl & (CCSCBDIR|CCARREN)) == (CCSCBDIR|CCARREN)) {
                         if ((ccscbctl & ARRDONE) != 0)
                                 break;
                 } else if ((ccscbctl & CCSCBDONE) != 0)
                         break;
                 ahd_delay(200);
         }
         /*
          * We leave the sequencer to cleanup in the case of DMA's to
          * update the qoutfifo.  In all other cases (DMA's to the
          * chip or a push of an SCB from the COMPLETE_DMA_SCB list),
          * we disable the DMA engine so that the sequencer will not
          * attempt to handle the DMA completion.
          */
         if ((ccscbctl & CCSCBDIR) != 0 || (ccscbctl & ARRDONE) != 0)
                 ahd_outb(ahd, CCSCBCTL, ccscbctl & ~(CCARREN|CCSCBEN));
 
         /*
          * Complete any SCBs that just finished
          * being DMA'ed into the qoutfifo.
          */
         ahd_run_qoutfifo(ahd);
 
         saved_scbptr = ahd_get_scbptr(ahd);
         /*
          * Manually update/complete any completed SCBs that are waiting to be
          * DMA'ed back up to the host.
          */
         scbid = ahd_inw(ahd, COMPLETE_DMA_SCB_HEAD);
         while (!SCBID_IS_NULL(scbid)) {
                 uint8_t *hscb_ptr;
                 u_int         i;
                 
                 ahd_set_scbptr(ahd, scbid);
                 next_scbid = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: Warning - DMA-up and complete "
                                "SCB %d invalid\n", ahd_name(ahd), scbid);
                         continue;
                 }
                 hscb_ptr = (uint8_t *)scb->hscb;
                 for (i = 0; i < sizeof(struct hardware_scb); i++)
                         *hscb_ptr++ = ahd_inb_scbram(ahd, SCB_BASE + i);
 
                 ahd_complete_scb(ahd, scb);
                 scbid = next_scbid;
         }
         ahd_outw(ahd, COMPLETE_DMA_SCB_HEAD, SCB_LIST_NULL);
         ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, SCB_LIST_NULL);
 
         scbid = ahd_inw(ahd, COMPLETE_ON_QFREEZE_HEAD);
         while (!SCBID_IS_NULL(scbid)) {
 
                 ahd_set_scbptr(ahd, scbid);
                 next_scbid = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: Warning - Complete Qfrz SCB %d invalid\n",
                                ahd_name(ahd), scbid);
                         continue;
                 }
 
                 ahd_complete_scb(ahd, scb);
                 scbid = next_scbid;
         }
         ahd_outw(ahd, COMPLETE_ON_QFREEZE_HEAD, SCB_LIST_NULL);
 
         scbid = ahd_inw(ahd, COMPLETE_SCB_HEAD);
         while (!SCBID_IS_NULL(scbid)) {
 
                 ahd_set_scbptr(ahd, scbid);
                 next_scbid = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: Warning - Complete SCB %d invalid\n",
                                ahd_name(ahd), scbid);
                         continue;
                 }
 
                 ahd_complete_scb(ahd, scb);
                 scbid = next_scbid;
         }
         ahd_outw(ahd, COMPLETE_SCB_HEAD, SCB_LIST_NULL);
 
         /*
          * Restore state.
          */
         ahd_set_scbptr(ahd, saved_scbptr);
         ahd_restore_modes(ahd, saved_modes);
         ahd->flags |= AHD_UPDATE_PEND_CMDS;
 }
 
 /*
  * Determine if an SCB for a packetized transaction
  * is active in a FIFO.
  */
 static int
 ahd_scb_active_in_fifo(struct ahd_softc *ahd, struct scb *scb)
 {
 
         /*
          * The FIFO is only active for our transaction if
          * the SCBPTR matches the SCB's ID and the firmware
          * has installed a handler for the FIFO or we have
          * a pending SAVEPTRS or CFG4DATA interrupt.
          */
         if (ahd_get_scbptr(ahd) != SCB_GET_TAG(scb)
          || ((ahd_inb(ahd, LONGJMP_ADDR+1) & INVALID_ADDR) != 0
           && (ahd_inb(ahd, SEQINTSRC) & (CFG4DATA|SAVEPTRS)) == 0))
                 return (0);
 
         return (1);
 }
 
 /*
  * Run a data fifo to completion for a transaction we know
  * has completed across the SCSI bus (good status has been
  * received).  We are already set to the correct FIFO mode
  * on entry to this routine.
  *
  * This function attempts to operate exactly as the firmware
  * would when running this FIFO.  Care must be taken to update
  * this routine any time the firmware's FIFO algorithm is
  * changed.
  */
 static void
 ahd_run_data_fifo(struct ahd_softc *ahd, struct scb *scb)
 {
         u_int seqintsrc;
 
         seqintsrc = ahd_inb(ahd, SEQINTSRC);
         if ((seqintsrc & CFG4DATA) != 0) {
                 uint32_t datacnt;
                 uint32_t sgptr;
 
                 /*
                  * Clear full residual flag.
                  */
                 sgptr = ahd_inl_scbram(ahd, SCB_SGPTR) & ~SG_FULL_RESID;
                 ahd_outb(ahd, SCB_SGPTR, sgptr);
 
                 /*
                  * Load datacnt and address.
                  */
                 datacnt = ahd_inl_scbram(ahd, SCB_DATACNT);
                 if ((datacnt & AHD_DMA_LAST_SEG) != 0) {
                         sgptr |= LAST_SEG;
                         ahd_outb(ahd, SG_STATE, 0);
                 } else
                         ahd_outb(ahd, SG_STATE, LOADING_NEEDED);
                 ahd_outq(ahd, HADDR, ahd_inq_scbram(ahd, SCB_DATAPTR));
                 ahd_outl(ahd, HCNT, datacnt & AHD_SG_LEN_MASK);
                 ahd_outb(ahd, SG_CACHE_PRE, sgptr);
                 ahd_outb(ahd, DFCNTRL, PRELOADEN|SCSIEN|HDMAEN);
 
                 /*
                  * Initialize Residual Fields.
                  */
                 ahd_outb(ahd, SCB_RESIDUAL_DATACNT+3, datacnt >> 24);
                 ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr & SG_PTR_MASK);
 
                 /*
                  * Mark the SCB as having a FIFO in use.
                  */
                 ahd_outb(ahd, SCB_FIFO_USE_COUNT,
                          ahd_inb_scbram(ahd, SCB_FIFO_USE_COUNT) + 1);
 
                 /*
                  * Install a "fake" handler for this FIFO.
                  */
                 ahd_outw(ahd, LONGJMP_ADDR, 0);
 
                 /*
                  * Notify the hardware that we have satisfied
                  * this sequencer interrupt.
                  */
                 ahd_outb(ahd, CLRSEQINTSRC, CLRCFG4DATA);
         } else if ((seqintsrc & SAVEPTRS) != 0) {
                 uint32_t sgptr;
                 uint32_t resid;
 
                 if ((ahd_inb(ahd, LONGJMP_ADDR+1)&INVALID_ADDR) != 0) {
                         /*
                          * Snapshot Save Pointers.  All that
                          * is necessary to clear the snapshot
                          * is a CLRCHN.
                          */
                         goto clrchn;
                 }
 
                 /*
                  * Disable S/G fetch so the DMA engine
                  * is available to future users.
                  */
                 if ((ahd_inb(ahd, SG_STATE) & FETCH_INPROG) != 0)
                         ahd_outb(ahd, CCSGCTL, 0);
                 ahd_outb(ahd, SG_STATE, 0);
 
                 /*
                  * Flush the data FIFO.  Strickly only
                  * necessary for Rev A parts.
                  */
                 ahd_outb(ahd, DFCNTRL, ahd_inb(ahd, DFCNTRL) | FIFOFLUSH);
 
                 /*
                  * Calculate residual.
                  */
                 sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
                 resid = ahd_inl(ahd, SHCNT);
                 resid |= ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT+3) << 24;
                 ahd_outl(ahd, SCB_RESIDUAL_DATACNT, resid);
                 if ((ahd_inb(ahd, SG_CACHE_SHADOW) & LAST_SEG) == 0) {
                         /*
                          * Must back up to the correct S/G element.
                          * Typically this just means resetting our
                          * low byte to the offset in the SG_CACHE,
                          * but if we wrapped, we have to correct
                          * the other bytes of the sgptr too.
                          */
                         if ((ahd_inb(ahd, SG_CACHE_SHADOW) & 0x80) != 0
                          && (sgptr & 0x80) == 0)
                                 sgptr -= 0x100;
                         sgptr &= ~0xFF;
                         sgptr |= ahd_inb(ahd, SG_CACHE_SHADOW)
                                & SG_ADDR_MASK;
                         ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr);
                         ahd_outb(ahd, SCB_RESIDUAL_DATACNT + 3, 0);
                 } else if ((resid & AHD_SG_LEN_MASK) == 0) {
                         ahd_outb(ahd, SCB_RESIDUAL_SGPTR,
                                  sgptr | SG_LIST_NULL);
                 }
                 /*
                  * Save Pointers.
                  */
                 ahd_outq(ahd, SCB_DATAPTR, ahd_inq(ahd, SHADDR));
                 ahd_outl(ahd, SCB_DATACNT, resid);
                 ahd_outl(ahd, SCB_SGPTR, sgptr);
                 ahd_outb(ahd, CLRSEQINTSRC, CLRSAVEPTRS);
                 ahd_outb(ahd, SEQIMODE,
                          ahd_inb(ahd, SEQIMODE) | ENSAVEPTRS);
                 /*
                  * If the data is to the SCSI bus, we are
                  * done, otherwise wait for FIFOEMP.
                  */
                 if ((ahd_inb(ahd, DFCNTRL) & DIRECTION) != 0)
                         goto clrchn;
         } else if ((ahd_inb(ahd, SG_STATE) & LOADING_NEEDED) != 0) {
                 uint32_t sgptr;
                 uint64_t data_addr;
                 uint32_t data_len;
                 u_int         dfcntrl;
 
                 /*
                  * Disable S/G fetch so the DMA engine
                  * is available to future users.  We won't
                  * be using the DMA engine to load segments.
                  */
                 if ((ahd_inb(ahd, SG_STATE) & FETCH_INPROG) != 0) {
                         ahd_outb(ahd, CCSGCTL, 0);
                         ahd_outb(ahd, SG_STATE, LOADING_NEEDED);
                 }
 
                 /*
                  * Wait for the DMA engine to notice that the
                  * host transfer is enabled and that there is
                  * space in the S/G FIFO for new segments before
                  * loading more segments.
                  */
                 if ((ahd_inb(ahd, DFSTATUS) & PRELOAD_AVAIL) != 0
                  && (ahd_inb(ahd, DFCNTRL) & HDMAENACK) != 0) {
 
                         /*
                          * Determine the offset of the next S/G
                          * element to load.
                          */
                         sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
                         sgptr &= SG_PTR_MASK;
                         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                                 struct ahd_dma64_seg *sg;
 
                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
                                 data_addr = sg->addr;
                                 data_len = sg->len;
                                 sgptr += sizeof(*sg);
                         } else {
                                 struct        ahd_dma_seg *sg;
 
                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
                                 data_addr = sg->len & AHD_SG_HIGH_ADDR_MASK;
                                 data_addr <<= 8;
                                 data_addr |= sg->addr;
                                 data_len = sg->len;
                                 sgptr += sizeof(*sg);
                         }
 
                         /*
                          * Update residual information.
                          */
                         ahd_outb(ahd, SCB_RESIDUAL_DATACNT+3, data_len >> 24);
                         ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr);
 
                         /*
                          * Load the S/G.
                          */
                         if (data_len & AHD_DMA_LAST_SEG) {
                                 sgptr |= LAST_SEG;
                                 ahd_outb(ahd, SG_STATE, 0);
                         }
                         ahd_outq(ahd, HADDR, data_addr);
                         ahd_outl(ahd, HCNT, data_len & AHD_SG_LEN_MASK);
                         ahd_outb(ahd, SG_CACHE_PRE, sgptr & 0xFF);
 
                         /*
                          * Advertise the segment to the hardware.
                          */
                         dfcntrl = ahd_inb(ahd, DFCNTRL)|PRELOADEN|HDMAEN;
                         if ((ahd->features & AHD_NEW_DFCNTRL_OPTS) != 0) {
                                 /*
                                  * Use SCSIENWRDIS so that SCSIEN
                                  * is never modified by this
                                  * operation.
                                  */
                                 dfcntrl |= SCSIENWRDIS;
                         }
                         ahd_outb(ahd, DFCNTRL, dfcntrl);
                 }
         } else if ((ahd_inb(ahd, SG_CACHE_SHADOW) & LAST_SEG_DONE) != 0) {
 
                 /*
                  * Transfer completed to the end of SG list
                  * and has flushed to the host.
                  */
                 ahd_outb(ahd, SCB_SGPTR,
                          ahd_inb_scbram(ahd, SCB_SGPTR) | SG_LIST_NULL);
                 goto clrchn;
         } else if ((ahd_inb(ahd, DFSTATUS) & FIFOEMP) != 0) {
 clrchn:
                 /*
                  * Clear any handler for this FIFO, decrement
                  * the FIFO use count for the SCB, and release
                  * the FIFO.
                  */
                 ahd_outb(ahd, LONGJMP_ADDR + 1, INVALID_ADDR);
                 ahd_outb(ahd, SCB_FIFO_USE_COUNT,
                          ahd_inb_scbram(ahd, SCB_FIFO_USE_COUNT) - 1);
                 ahd_outb(ahd, DFFSXFRCTL, CLRCHN);
         }
 }
 
 /*
  * Look for entries in the QoutFIFO that have completed.
  * The valid_tag completion field indicates the validity
  * of the entry - the valid value toggles each time through
  * the queue. We use the sg_status field in the completion
  * entry to avoid referencing the hscb if the completion
  * occurred with no errors and no residual.  sg_status is
  * a copy of the first byte (little endian) of the sgptr
  * hscb field.
  */
 static void
 ahd_run_qoutfifo(struct ahd_softc *ahd)
 {
         struct ahd_completion *completion;
         struct scb *scb;
         u_int  scb_index;
 
         if ((ahd->flags & AHD_RUNNING_QOUTFIFO) != 0)
                 panic("ahd_run_qoutfifo recursion");
         ahd->flags |= AHD_RUNNING_QOUTFIFO;
         ahd_sync_qoutfifo(ahd, BUS_DMASYNC_POSTREAD);
         for (;;) {
                 completion = &ahd->qoutfifo[ahd->qoutfifonext];
 
                 if (completion->valid_tag != ahd->qoutfifonext_valid_tag)
                         break;
 
                 scb_index = ahd_le16toh(completion->tag);
                 scb = ahd_lookup_scb(ahd, scb_index);
                 if (scb == NULL) {
                         printf("%s: WARNING no command for scb %d "
                                "(cmdcmplt)\nQOUTPOS = %d\n",
                                ahd_name(ahd), scb_index,
                                ahd->qoutfifonext);
                         ahd_dump_card_state(ahd);
                 } else if ((completion->sg_status & SG_STATUS_VALID) != 0) {
                         ahd_handle_scb_status(ahd, scb);
                 } else {
                         ahd_done(ahd, scb);
                 }
 
                 ahd->qoutfifonext = (ahd->qoutfifonext+1) & (AHD_QOUT_SIZE-1);
                 if (ahd->qoutfifonext == 0)
                         ahd->qoutfifonext_valid_tag ^= QOUTFIFO_ENTRY_VALID;
         }
         ahd->flags &= ~AHD_RUNNING_QOUTFIFO;
 }
 
 /************************* Interrupt Handling *********************************/
 static void
 ahd_handle_hwerrint(struct ahd_softc *ahd)
 {
         /*
          * Some catastrophic hardware error has occurred.
          * Print it for the user and disable the controller.
          */
         int i;
         int error;
 
         error = ahd_inb(ahd, ERROR);
         for (i = 0; i < num_errors; i++) {
                 if ((error & ahd_hard_errors[i].errno) != 0)
                         printf("%s: hwerrint, %s\n",
                                ahd_name(ahd), ahd_hard_errors[i].errmesg);
         }
 
         ahd_dump_card_state(ahd);
         panic("BRKADRINT");
 
         /* Tell everyone that this HBA is no longer available */
         ahd_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
                        CAM_LUN_WILDCARD, SCB_LIST_NULL, ROLE_UNKNOWN,
                        CAM_NO_HBA);
 
         /* Tell the system that this controller has gone away. */
         ahd_free(ahd);
 }
 
 #ifdef AHD_DEBUG
 static void
 ahd_dump_sglist(struct scb *scb)
 {
         int i;
 
         if (scb->sg_count > 0) {
                 if ((scb->ahd_softc->flags & AHD_64BIT_ADDRESSING) != 0) {
                         struct ahd_dma64_seg *sg_list;
 
                         sg_list = (struct ahd_dma64_seg*)scb->sg_list;
                         for (i = 0; i < scb->sg_count; i++) {
                                 uint64_t addr;
                                 uint32_t len;
 
                                 addr = ahd_le64toh(sg_list[i].addr);
                                 len = ahd_le32toh(sg_list[i].len);
                                 printf("sg[%d] - Addr 0x%x%x : Length %d%s\n",
                                        i,
                                        (uint32_t)((addr >> 32) & 0xFFFFFFFF),
                                        (uint32_t)(addr & 0xFFFFFFFF),
                                        sg_list[i].len & AHD_SG_LEN_MASK,
                                        (sg_list[i].len & AHD_DMA_LAST_SEG)
                                      ? " Last" : "");
                         }
                 } else {
                         struct ahd_dma_seg *sg_list;
 
                         sg_list = (struct ahd_dma_seg*)scb->sg_list;
                         for (i = 0; i < scb->sg_count; i++) {
                                 uint32_t len;
 
                                 len = ahd_le32toh(sg_list[i].len);
                                 printf("sg[%d] - Addr 0x%x%x : Length %d%s\n",
                                        i,
                                        (len & AHD_SG_HIGH_ADDR_MASK) >> 24,
                                        ahd_le32toh(sg_list[i].addr),
                                        len & AHD_SG_LEN_MASK,
                                        len & AHD_DMA_LAST_SEG ? " Last" : "");
                         }
                 }
         }
 }
 #endif  /*  AHD_DEBUG  */
 
 static void
 ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat)
 {
         u_int seqintcode;
 
         /*
          * Save the sequencer interrupt code and clear the SEQINT
          * bit. We will unpause the sequencer, if appropriate,
          * after servicing the request.
          */
         seqintcode = ahd_inb(ahd, SEQINTCODE);
         ahd_outb(ahd, CLRINT, CLRSEQINT);
         if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
                 /*
                  * Unpause the sequencer and let it clear
                  * SEQINT by writing NO_SEQINT to it.  This
                  * will cause the sequencer to be paused again,
                  * which is the expected state of this routine.
                  */
                 ahd_unpause(ahd);
                 while (!ahd_is_paused(ahd))
                         ;
                 ahd_outb(ahd, CLRINT, CLRSEQINT);
         }
         ahd_update_modes(ahd);
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MISC) != 0)
                 printf("%s: Handle Seqint Called for code %d\n",
                        ahd_name(ahd), seqintcode);
 #endif
         switch (seqintcode) {
         case ENTERING_NONPACK:
         {
                 struct        scb *scb;
                 u_int        scbid;
 
                 AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                                  ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         /*
                          * Somehow need to know if this
                          * is from a selection or reselection.
                          * From that, we can determine target
                          * ID so we at least have an I_T nexus.
                          */
                 } else {
                         ahd_outb(ahd, SAVED_SCSIID, scb->hscb->scsiid);
                         ahd_outb(ahd, SAVED_LUN, scb->hscb->lun);
                         ahd_outb(ahd, SEQ_FLAGS, 0x0);
                 }
                 if ((ahd_inb(ahd, LQISTAT2) & LQIPHASE_OUTPKT) != 0
                  && (ahd_inb(ahd, SCSISIGO) & ATNO) != 0) {
                         /*
                          * Phase change after read stream with
                          * CRC error with P0 asserted on last
                          * packet.
                          */
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
                                 printf("%s: Assuming LQIPHASE_NLQ with "
                                        "P0 assertion\n", ahd_name(ahd));
 #endif
                 }
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
                         printf("%s: Entering NONPACK\n", ahd_name(ahd));
 #endif
                 break;
         }
         case INVALID_SEQINT:
                 printf("%s: Invalid Sequencer interrupt occurred, "
                        "resetting channel.\n",
                        ahd_name(ahd));
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
                         ahd_dump_card_state(ahd);
 #endif
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                 break;
         case STATUS_OVERRUN:
         {
                 struct        scb *scb;
                 u_int        scbid;
 
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb != NULL)
                         ahd_print_path(ahd, scb);
                 else
                         printf("%s: ", ahd_name(ahd));
                 printf("SCB %d Packetized Status Overrun", scbid);
                 ahd_dump_card_state(ahd);
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                 break;
         }
         case CFG4ISTAT_INTR:
         {
                 struct        scb *scb;
                 u_int        scbid;
 
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         ahd_dump_card_state(ahd);
                         printf("CFG4ISTAT: Free SCB %d referenced", scbid);
                         panic("For safety");
                 }
                 ahd_outq(ahd, HADDR, scb->sense_busaddr);
                 ahd_outw(ahd, HCNT, AHD_SENSE_BUFSIZE);
                 ahd_outb(ahd, HCNT + 2, 0);
                 ahd_outb(ahd, SG_CACHE_PRE, SG_LAST_SEG);
                 ahd_outb(ahd, DFCNTRL, PRELOADEN|SCSIEN|HDMAEN);
                 break;
         }
         case ILLEGAL_PHASE:
         {
                 u_int bus_phase;
 
                 bus_phase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
                 printf("%s: ILLEGAL_PHASE 0x%x\n",
                        ahd_name(ahd), bus_phase);
 
                 switch (bus_phase) {
                 case P_DATAOUT:
                 case P_DATAIN:
                 case P_DATAOUT_DT:
                 case P_DATAIN_DT:
                 case P_MESGOUT:
                 case P_STATUS:
                 case P_MESGIN:
                         ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                         printf("%s: Issued Bus Reset.\n", ahd_name(ahd));
                         break;
                 case P_COMMAND:
                 {
                         struct        ahd_devinfo devinfo;
                         struct        scb *scb;
                         struct        ahd_initiator_tinfo *targ_info;
                         struct        ahd_tmode_tstate *tstate;
                         struct        ahd_transinfo *tinfo;
                         u_int        scbid;
 
                         /*
                          * If a target takes us into the command phase
                          * assume that it has been externally reset and
                          * has thus lost our previous packetized negotiation
                          * agreement.  Since we have not sent an identify
                          * message and may not have fully qualified the
                          * connection, we change our command to TUR, assert
                          * ATN and ABORT the task when we go to message in
                          * phase.  The OSM will see the REQUEUE_REQUEST
                          * status and retry the command.
                          */
                         scbid = ahd_get_scbptr(ahd);
                         scb = ahd_lookup_scb(ahd, scbid);
                         if (scb == NULL) {
                                 printf("Invalid phase with no valid SCB.  "
                                        "Resetting bus.\n");
                                 ahd_reset_channel(ahd, 'A',
                                                   /*Initiate Reset*/TRUE);
                                 break;
                         }
                         ahd_compile_devinfo(&devinfo, SCB_GET_OUR_ID(scb),
                                             SCB_GET_TARGET(ahd, scb),
                                             SCB_GET_LUN(scb),
                                             SCB_GET_CHANNEL(ahd, scb),
                                             ROLE_INITIATOR);
                         targ_info = ahd_fetch_transinfo(ahd,
                                                         devinfo.channel,
                                                         devinfo.our_scsiid,
                                                         devinfo.target,
                                                         &tstate);
                         tinfo = &targ_info->curr;
                         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                                       AHD_TRANS_ACTIVE, /*paused*/TRUE);
                         ahd_set_syncrate(ahd, &devinfo, /*period*/0,
                                          /*offset*/0, /*ppr_options*/0,
                                          AHD_TRANS_ACTIVE, /*paused*/TRUE);
                         /* Hand-craft TUR command */
                         ahd_outb(ahd, SCB_CDB_STORE, 0);
                         ahd_outb(ahd, SCB_CDB_STORE+1, 0);
                         ahd_outb(ahd, SCB_CDB_STORE+2, 0);
                         ahd_outb(ahd, SCB_CDB_STORE+3, 0);
                         ahd_outb(ahd, SCB_CDB_STORE+4, 0);
                         ahd_outb(ahd, SCB_CDB_STORE+5, 0);
                         ahd_outb(ahd, SCB_CDB_LEN, 6);
                         scb->hscb->control &= ~(TAG_ENB|SCB_TAG_TYPE);
                         scb->hscb->control |= MK_MESSAGE;
                         ahd_outb(ahd, SCB_CONTROL, scb->hscb->control);
                         ahd_outb(ahd, MSG_OUT, HOST_MSG);
                         ahd_outb(ahd, SAVED_SCSIID, scb->hscb->scsiid);
                         /*
                          * The lun is 0, regardless of the SCB's lun
                          * as we have not sent an identify message.
                          */
                         ahd_outb(ahd, SAVED_LUN, 0);
                         ahd_outb(ahd, SEQ_FLAGS, 0);
                         ahd_assert_atn(ahd);
                         scb->flags &= ~SCB_PACKETIZED;
                         scb->flags |= SCB_ABORT|SCB_EXTERNAL_RESET;
                         ahd_freeze_devq(ahd, scb);
                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
                         ahd_freeze_scb(scb);
 
                         /* Notify XPT */
                         ahd_send_async(ahd, devinfo.channel, devinfo.target,
                                        CAM_LUN_WILDCARD, AC_SENT_BDR);
 
                         /*
                          * Allow the sequencer to continue with
                          * non-pack processing.
                          */
                         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                         ahd_outb(ahd, CLRLQOINT1, CLRLQOPHACHGINPKT);
                         if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
                                 ahd_outb(ahd, CLRLQOINT1, 0);
                         }
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
                                 ahd_print_path(ahd, scb);
                                 printf("Unexpected command phase from "
                                        "packetized target\n");
                         }
 #endif
                         break;
                 }
                 }
                 break;
         }
         case CFG4OVERRUN:
         {
                 struct        scb *scb;
                 u_int        scb_index;
                 
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
                         printf("%s: CFG4OVERRUN mode = %x\n", ahd_name(ahd),
                                ahd_inb(ahd, MODE_PTR));
                 }
 #endif
                 scb_index = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scb_index);
                 if (scb == NULL) {
                         /*
                          * Attempt to transfer to an SCB that is
                          * not outstanding.
                          */
                         ahd_assert_atn(ahd);
                         ahd_outb(ahd, MSG_OUT, HOST_MSG);
                         ahd->msgout_buf[0] = MSG_ABORT_TASK;
                         ahd->msgout_len = 1;
                         ahd->msgout_index = 0;
                         ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
                         /*
                          * Clear status received flag to prevent any
                          * attempt to complete this bogus SCB.
                          */
                         ahd_outb(ahd, SCB_CONTROL,
                                  ahd_inb_scbram(ahd, SCB_CONTROL)
                                  & ~STATUS_RCVD);
                 }
                 break;
         }
         case DUMP_CARD_STATE:
         {
                 ahd_dump_card_state(ahd);
                 break;
         }
         case PDATA_REINIT:
         {
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
                         printf("%s: PDATA_REINIT - DFCNTRL = 0x%x "
                                "SG_CACHE_SHADOW = 0x%x\n",
                                ahd_name(ahd), ahd_inb(ahd, DFCNTRL),
                                ahd_inb(ahd, SG_CACHE_SHADOW));
                 }
 #endif
                 ahd_reinitialize_dataptrs(ahd);
                 break;
         }
         case HOST_MSG_LOOP:
         {
                 struct ahd_devinfo devinfo;
 
                 /*
                  * The sequencer has encountered a message phase
                  * that requires host assistance for completion.
                  * While handling the message phase(s), we will be
                  * notified by the sequencer after each byte is
                  * transfered so we can track bus phase changes.
                  *
                  * If this is the first time we've seen a HOST_MSG_LOOP
                  * interrupt, initialize the state of the host message
                  * loop.
                  */
                 ahd_fetch_devinfo(ahd, &devinfo);
                 if (ahd->msg_type == MSG_TYPE_NONE) {
                         struct scb *scb;
                         u_int scb_index;
                         u_int bus_phase;
 
                         bus_phase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
                         if (bus_phase != P_MESGIN
                          && bus_phase != P_MESGOUT) {
                                 printf("ahd_intr: HOST_MSG_LOOP bad "
                                        "phase 0x%x\n", bus_phase);
                                 /*
                                  * Probably transitioned to bus free before
                                  * we got here.  Just punt the message.
                                  */
                                 ahd_dump_card_state(ahd);
                                 ahd_clear_intstat(ahd);
                                 ahd_restart(ahd);
                                 return;
                         }
 
                         scb_index = ahd_get_scbptr(ahd);
                         scb = ahd_lookup_scb(ahd, scb_index);
                         if (devinfo.role == ROLE_INITIATOR) {
                                 if (bus_phase == P_MESGOUT)
                                         ahd_setup_initiator_msgout(ahd,
                                                                    &devinfo,
                                                                    scb);
                                 else {
                                         ahd->msg_type =
                                             MSG_TYPE_INITIATOR_MSGIN;
                                         ahd->msgin_index = 0;
                                 }
                         }
 #ifdef AHD_TARGET_MODE
                         else {
                                 if (bus_phase == P_MESGOUT) {
                                         ahd->msg_type =
                                             MSG_TYPE_TARGET_MSGOUT;
                                         ahd->msgin_index = 0;
                                 }
                                 else 
                                         ahd_setup_target_msgin(ahd,
                                                                &devinfo,
                                                                scb);
                         }
 #endif
                 }
 
                 ahd_handle_message_phase(ahd);
                 break;
         }
         case NO_MATCH:
         {
                 /* Ensure we don't leave the selection hardware on */
                 AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
                 ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
 
                 printf("%s:%c:%d: no active SCB for reconnecting "
                        "target - issuing BUS DEVICE RESET\n",
                        ahd_name(ahd), 'A', ahd_inb(ahd, SELID) >> 4);
                 printf("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
                        "REG0 == 0x%x ACCUM = 0x%x\n",
                        ahd_inb(ahd, SAVED_SCSIID), ahd_inb(ahd, SAVED_LUN),
                        ahd_inw(ahd, REG0), ahd_inb(ahd, ACCUM));
                 printf("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
                        "SINDEX == 0x%x\n",
                        ahd_inb(ahd, SEQ_FLAGS), ahd_get_scbptr(ahd),
                        ahd_find_busy_tcl(ahd,
                                          BUILD_TCL(ahd_inb(ahd, SAVED_SCSIID),
                                                    ahd_inb(ahd, SAVED_LUN))),
                        ahd_inw(ahd, SINDEX));
                 printf("SELID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
                        "SCB_CONTROL == 0x%x\n",
                        ahd_inb(ahd, SELID), ahd_inb_scbram(ahd, SCB_SCSIID),
                        ahd_inb_scbram(ahd, SCB_LUN),
                        ahd_inb_scbram(ahd, SCB_CONTROL));
                 printf("SCSIBUS[0] == 0x%x, SCSISIGI == 0x%x\n",
                        ahd_inb(ahd, SCSIBUS), ahd_inb(ahd, SCSISIGI));
                 printf("SXFRCTL0 == 0x%x\n", ahd_inb(ahd, SXFRCTL0));
                 printf("SEQCTL0 == 0x%x\n", ahd_inb(ahd, SEQCTL0));
                 ahd_dump_card_state(ahd);
                 ahd->msgout_buf[0] = MSG_BUS_DEV_RESET;
                 ahd->msgout_len = 1;
                 ahd->msgout_index = 0;
                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
                 ahd_assert_atn(ahd);
                 break;
         }
         case PROTO_VIOLATION:
         {
                 ahd_handle_proto_violation(ahd);
                 break;
         }
         case IGN_WIDE_RES:
         {
                 struct ahd_devinfo devinfo;
 
                 ahd_fetch_devinfo(ahd, &devinfo);
                 ahd_handle_ign_wide_residue(ahd, &devinfo);
                 break;
         }
         case BAD_PHASE:
         {
                 u_int lastphase;
 
                 lastphase = ahd_inb(ahd, LASTPHASE);
                 printf("%s:%c:%d: unknown scsi bus phase %x, "
                        "lastphase = 0x%x.  Attempting to continue\n",
                        ahd_name(ahd), 'A',
                        SCSIID_TARGET(ahd, ahd_inb(ahd, SAVED_SCSIID)),
                        lastphase, ahd_inb(ahd, SCSISIGI));
                 break;
         }
         case MISSED_BUSFREE:
         {
                 u_int lastphase;
 
                 lastphase = ahd_inb(ahd, LASTPHASE);
                 printf("%s:%c:%d: Missed busfree. "
                        "Lastphase = 0x%x, Curphase = 0x%x\n",
                        ahd_name(ahd), 'A',
                        SCSIID_TARGET(ahd, ahd_inb(ahd, SAVED_SCSIID)),
                        lastphase, ahd_inb(ahd, SCSISIGI));
                 ahd_restart(ahd);
                 return;
         }
         case DATA_OVERRUN:
         {
                 /*
                  * When the sequencer detects an overrun, it
                  * places the controller in "BITBUCKET" mode
                  * and allows the target to complete its transfer.
                  * Unfortunately, none of the counters get updated
                  * when the controller is in this mode, so we have
                  * no way of knowing how large the overrun was.
                  */
                 struct        scb *scb;
                 u_int        scbindex;
 #ifdef AHD_DEBUG
                 u_int        lastphase;
 #endif
 
                 scbindex = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbindex);
 #ifdef AHD_DEBUG
                 lastphase = ahd_inb(ahd, LASTPHASE);
                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
                         ahd_print_path(ahd, scb);
                         printf("data overrun detected %s.  Tag == 0x%x.\n",
                                ahd_lookup_phase_entry(lastphase)->phasemsg,
                                SCB_GET_TAG(scb));
                         ahd_print_path(ahd, scb);
                         printf("%s seen Data Phase.  Length = %ld.  "
                                "NumSGs = %d.\n",
                                ahd_inb(ahd, SEQ_FLAGS) & DPHASE
                                ? "Have" : "Haven't",
                                ahd_get_transfer_length(scb), scb->sg_count);
                         ahd_dump_sglist(scb);
                 }
 #endif
 
                 /*
                  * Set this and it will take effect when the
                  * target does a command complete.
                  */
                 ahd_freeze_devq(ahd, scb);
                 ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
                 ahd_freeze_scb(scb);
                 break;
         }
         case MKMSG_FAILED:
         {
                 struct ahd_devinfo devinfo;
                 struct scb *scb;
                 u_int scbid;
 
                 ahd_fetch_devinfo(ahd, &devinfo);
                 printf("%s:%c:%d:%d: Attempt to issue message failed\n",
                        ahd_name(ahd), devinfo.channel, devinfo.target,
                        devinfo.lun);
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb != NULL
                  && (scb->flags & SCB_RECOVERY_SCB) != 0)
                         /*
                          * Ensure that we didn't put a second instance of this
                          * SCB into the QINFIFO.
                          */
                         ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
                                            SCB_GET_CHANNEL(ahd, scb),
                                            SCB_GET_LUN(scb), SCB_GET_TAG(scb),
                                            ROLE_INITIATOR, /*status*/0,
                                            SEARCH_REMOVE);
                 ahd_outb(ahd, SCB_CONTROL,
                          ahd_inb_scbram(ahd, SCB_CONTROL) & ~MK_MESSAGE);
                 break;
         }
         case TASKMGMT_FUNC_COMPLETE:
         {
                 u_int        scbid;
                 struct        scb *scb;
 
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb != NULL) {
                         u_int           lun;
                         u_int           tag;
                         cam_status error;
 
                         ahd_print_path(ahd, scb);
                         printf("Task Management Func 0x%x Complete\n",
                                scb->hscb->task_management);
                         lun = CAM_LUN_WILDCARD;
                         tag = SCB_LIST_NULL;
 
                         switch (scb->hscb->task_management) {
                         case SIU_TASKMGMT_ABORT_TASK:
                                 tag = SCB_GET_TAG(scb);
                         case SIU_TASKMGMT_ABORT_TASK_SET:
                         case SIU_TASKMGMT_CLEAR_TASK_SET:
                                 lun = scb->hscb->lun;
                                 error = CAM_REQ_ABORTED;
                                 ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
                                                'A', lun, tag, ROLE_INITIATOR,
                                                error);
                                 break;
                         case SIU_TASKMGMT_LUN_RESET:
                                 lun = scb->hscb->lun;
                         case SIU_TASKMGMT_TARGET_RESET:
                         {
                                 struct ahd_devinfo devinfo;
 
                                 ahd_scb_devinfo(ahd, &devinfo, scb);
                                 error = CAM_BDR_SENT;
                                 ahd_handle_devreset(ahd, &devinfo, lun,
                                                     CAM_BDR_SENT,
                                                     lun != CAM_LUN_WILDCARD
                                                     ? "Lun Reset"
                                                     : "Target Reset",
                                                     /*verbose_level*/0);
                                 break;
                         }
                         default:
                                 panic("Unexpected TaskMgmt Func\n");
                                 break;
                         }
                 }
                 break;
         }
         case TASKMGMT_CMD_CMPLT_OKAY:
         {
                 u_int        scbid;
                 struct        scb *scb;
 
                 /*
                  * An ABORT TASK TMF failed to be delivered before
                  * the targeted command completed normally.
                  */
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb != NULL) {
                         /*
                          * Remove the second instance of this SCB from
                          * the QINFIFO if it is still there.
                          */
                         ahd_print_path(ahd, scb);
                         printf("SCB completes before TMF\n");
                         /*
                          * Handle losing the race.  Wait until any
                          * current selection completes.  We will then
                          * set the TMF back to zero in this SCB so that
                          * the sequencer doesn't bother to issue another
                          * sequencer interrupt for its completion.
                          */
                         while ((ahd_inb(ahd, SCSISEQ0) & ENSELO) != 0
                             && (ahd_inb(ahd, SSTAT0) & SELDO) == 0
                             && (ahd_inb(ahd, SSTAT1) & SELTO) == 0)
                                 ;
                         ahd_outb(ahd, SCB_TASK_MANAGEMENT, 0);
                         ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
                                            SCB_GET_CHANNEL(ahd, scb),  
                                            SCB_GET_LUN(scb), SCB_GET_TAG(scb), 
                                            ROLE_INITIATOR, /*status*/0,   
                                            SEARCH_REMOVE);
                 }
                 break;
         }
         case TRACEPOINT0:
         case TRACEPOINT1:
         case TRACEPOINT2:
         case TRACEPOINT3:
                 printf("%s: Tracepoint %d\n", ahd_name(ahd),
                        seqintcode - TRACEPOINT0);
                 break;
         case NO_SEQINT:
                 break;
         case SAW_HWERR:
                 ahd_handle_hwerrint(ahd);
                 break;
         default:
                 printf("%s: Unexpected SEQINTCODE %d\n", ahd_name(ahd),
                        seqintcode);
                 break;
         }
         /*
          *  The sequencer is paused immediately on
          *  a SEQINT, so we should restart it when
          *  we're done.
          */
         ahd_unpause(ahd);
 }
 
 static void
 ahd_handle_scsiint(struct ahd_softc *ahd, u_int intstat)
 {
         struct scb        *scb;
         u_int                 status0;
         u_int                 status3;
         u_int                 status;
         u_int                 lqistat1;
         u_int                 lqostat0;
         u_int                 scbid;
         u_int                 busfreetime;
 
         ahd_update_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         status3 = ahd_inb(ahd, SSTAT3) & (NTRAMPERR|OSRAMPERR);
         status0 = ahd_inb(ahd, SSTAT0) & (IOERR|OVERRUN|SELDI|SELDO);
         status = ahd_inb(ahd, SSTAT1) & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
         lqistat1 = ahd_inb(ahd, LQISTAT1);
         lqostat0 = ahd_inb(ahd, LQOSTAT0);
         busfreetime = ahd_inb(ahd, SSTAT2) & BUSFREETIME;
 
         /*
          * Ignore external resets after a bus reset.
          */
         if (((status & SCSIRSTI) != 0) && (ahd->flags & AHD_BUS_RESET_ACTIVE)) {
                 ahd_outb(ahd, CLRSINT1, CLRSCSIRSTI);
                 return;
         }
 
         /*
          * Clear bus reset flag
          */
         ahd->flags &= ~AHD_BUS_RESET_ACTIVE;
 
         if ((status0 & (SELDI|SELDO)) != 0) {
                 u_int simode0;
 
                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
                 simode0 = ahd_inb(ahd, SIMODE0);
                 status0 &= simode0 & (IOERR|OVERRUN|SELDI|SELDO);
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         }
         scbid = ahd_get_scbptr(ahd);
         scb = ahd_lookup_scb(ahd, scbid);
         if (scb != NULL
          && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
                 scb = NULL;
 
         if ((status0 & IOERR) != 0) {
                 u_int now_lvd;
 
                 now_lvd = ahd_inb(ahd, SBLKCTL) & ENAB40;
                 printf("%s: Transceiver State Has Changed to %s mode\n",
                        ahd_name(ahd), now_lvd ? "LVD" : "SE");
                 ahd_outb(ahd, CLRSINT0, CLRIOERR);
                 /*
                  * A change in I/O mode is equivalent to a bus reset.
                  */
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                 ahd_pause(ahd);
                 ahd_setup_iocell_workaround(ahd);
                 ahd_unpause(ahd);
         } else if ((status0 & OVERRUN) != 0) {
 
                 printf("%s: SCSI offset overrun detected.  Resetting bus.\n",
                        ahd_name(ahd));
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
         } else if ((status & SCSIRSTI) != 0) {
 
                 printf("%s: Someone reset channel A\n", ahd_name(ahd));
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/FALSE);
         } else if ((status & SCSIPERR) != 0) {
 
                 /* Make sure the sequencer is in a safe location. */
                 ahd_clear_critical_section(ahd);
 
                 ahd_handle_transmission_error(ahd);
         } else if (lqostat0 != 0) {
 
                 printf("%s: lqostat0 == 0x%x!\n", ahd_name(ahd), lqostat0);
                 ahd_outb(ahd, CLRLQOINT0, lqostat0);
                 if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0)
                         ahd_outb(ahd, CLRLQOINT1, 0);
         } else if ((status & SELTO) != 0) {
                 /* Stop the selection */
                 ahd_outb(ahd, SCSISEQ0, 0);
 
                 /* Make sure the sequencer is in a safe location. */
                 ahd_clear_critical_section(ahd);
 
                 /* No more pending messages */
                 ahd_clear_msg_state(ahd);
 
                 /* Clear interrupt state */
                 ahd_outb(ahd, CLRSINT1, CLRSELTIMEO|CLRBUSFREE|CLRSCSIPERR);
 
                 /*
                  * Although the driver does not care about the
                  * 'Selection in Progress' status bit, the busy
                  * LED does.  SELINGO is only cleared by a sucessfull
                  * selection, so we must manually clear it to insure
                  * the LED turns off just incase no future successful
                  * selections occur (e.g. no devices on the bus).
                  */
                 ahd_outb(ahd, CLRSINT0, CLRSELINGO);
 
                 scbid = ahd_inw(ahd, WAITING_TID_HEAD);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: ahd_intr - referenced scb not "
                                "valid during SELTO scb(0x%x)\n",
                                ahd_name(ahd), scbid);
                         ahd_dump_card_state(ahd);
                 } else {
                         struct ahd_devinfo devinfo;
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_SELTO) != 0) {
                                 ahd_print_path(ahd, scb);
                                 printf("Saw Selection Timeout for SCB 0x%x\n",
                                        scbid);
                         }
 #endif
                         ahd_scb_devinfo(ahd, &devinfo, scb);
                         ahd_set_transaction_status(scb, CAM_SEL_TIMEOUT);
                         ahd_freeze_devq(ahd, scb);
 
                         /*
                          * Cancel any pending transactions on the device
                          * now that it seems to be missing.  This will
                          * also revert us to async/narrow transfers until
                          * we can renegotiate with the device.
                          */
                         ahd_handle_devreset(ahd, &devinfo,
                                             CAM_LUN_WILDCARD,
                                             CAM_SEL_TIMEOUT,
                                             "Selection Timeout",
                                             /*verbose_level*/1);
                 }
                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
                 ahd_iocell_first_selection(ahd);
                 ahd_unpause(ahd);
         } else if ((status0 & (SELDI|SELDO)) != 0) {
 
                 ahd_iocell_first_selection(ahd);
                 ahd_unpause(ahd);
         } else if (status3 != 0) {
                 printf("%s: SCSI Cell parity error SSTAT3 == 0x%x\n",
                        ahd_name(ahd), status3);
                 ahd_outb(ahd, CLRSINT3, status3);
         } else if ((lqistat1 & (LQIPHASE_LQ|LQIPHASE_NLQ)) != 0) {
 
                 /* Make sure the sequencer is in a safe location. */
                 ahd_clear_critical_section(ahd);
 
                 ahd_handle_lqiphase_error(ahd, lqistat1);
         } else if ((lqistat1 & LQICRCI_NLQ) != 0) {
                 /*
                  * This status can be delayed during some
                  * streaming operations.  The SCSIPHASE
                  * handler has already dealt with this case
                  * so just clear the error.
                  */
                 ahd_outb(ahd, CLRLQIINT1, CLRLQICRCI_NLQ);
         } else if ((status & BUSFREE) != 0
                 || (lqistat1 & LQOBUSFREE) != 0) {
                 u_int lqostat1;
                 int   restart;
                 int   clear_fifo;
                 int   packetized;
                 u_int mode;
 
                 /*
                  * Clear our selection hardware as soon as possible.
                  * We may have an entry in the waiting Q for this target,
                  * that is affected by this busfree and we don't want to
                  * go about selecting the target while we handle the event.
                  */
                 ahd_outb(ahd, SCSISEQ0, 0);
 
                 /* Make sure the sequencer is in a safe location. */
                 ahd_clear_critical_section(ahd);
 
                 /*
                  * Determine what we were up to at the time of
                  * the busfree.
                  */
                 mode = AHD_MODE_SCSI;
                 busfreetime = ahd_inb(ahd, SSTAT2) & BUSFREETIME;
                 lqostat1 = ahd_inb(ahd, LQOSTAT1);
                 switch (busfreetime) {
                 case BUSFREE_DFF0:
                 case BUSFREE_DFF1:
                 {
                         mode = busfreetime == BUSFREE_DFF0
                              ? AHD_MODE_DFF0 : AHD_MODE_DFF1;
                         ahd_set_modes(ahd, mode, mode);
                         scbid = ahd_get_scbptr(ahd);
                         scb = ahd_lookup_scb(ahd, scbid);
                         if (scb == NULL) {
                                 printf("%s: Invalid SCB %d in DFF%d "
                                        "during unexpected busfree\n",
                                        ahd_name(ahd), scbid, mode);
                                 packetized = 0;
                         } else
                                 packetized = (scb->flags & SCB_PACKETIZED) != 0;
                         clear_fifo = 1;
                         break;
                 }
                 case BUSFREE_LQO:
                         clear_fifo = 0;
                         packetized = 1;
                         break;
                 default:
                         clear_fifo = 0;
                         packetized =  (lqostat1 & LQOBUSFREE) != 0;
                         if (!packetized
                          && ahd_inb(ahd, LASTPHASE) == P_BUSFREE
                          && (ahd_inb(ahd, SSTAT0) & SELDI) == 0
                          && ((ahd_inb(ahd, SSTAT0) & SELDO) == 0
                           || (ahd_inb(ahd, SCSISEQ0) & ENSELO) == 0))
                                 /*
                                  * Assume packetized if we are not
                                  * on the bus in a non-packetized
                                  * capacity and any pending selection
                                  * was a packetized selection.
                                  */
                                 packetized = 1;
                         break;
                 }
 
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
                         printf("Saw Busfree.  Busfreetime = 0x%x.\n",
                                busfreetime);
 #endif
                 /*
                  * Busfrees that occur in non-packetized phases are
                  * handled by the nonpkt_busfree handler.
                  */
                 if (packetized && ahd_inb(ahd, LASTPHASE) == P_BUSFREE) {
                         restart = ahd_handle_pkt_busfree(ahd, busfreetime);
                 } else {
                         packetized = 0;
                         restart = ahd_handle_nonpkt_busfree(ahd);
                 }
                 /*
                  * Clear the busfree interrupt status.  The setting of
                  * the interrupt is a pulse, so in a perfect world, we
                  * would not need to muck with the ENBUSFREE logic.  This
                  * would ensure that if the bus moves on to another
                  * connection, busfree protection is still in force.  If
                  * BUSFREEREV is broken, however, we must manually clear
                  * the ENBUSFREE if the busfree occurred during a non-pack
                  * connection so that we don't get false positives during
                  * future, packetized, connections.
                  */
                 ahd_outb(ahd, CLRSINT1, CLRBUSFREE);
                 if (packetized == 0
                  && (ahd->bugs & AHD_BUSFREEREV_BUG) != 0)
                         ahd_outb(ahd, SIMODE1,
                                  ahd_inb(ahd, SIMODE1) & ~ENBUSFREE);
 
                 if (clear_fifo)
                         ahd_clear_fifo(ahd, mode);
 
                 ahd_clear_msg_state(ahd);
                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
                 if (restart) {
                         ahd_restart(ahd);
                 } else {
                         ahd_unpause(ahd);
                 }
         } else {
                 printf("%s: Missing case in ahd_handle_scsiint. status = %x\n",
                        ahd_name(ahd), status);
                 ahd_dump_card_state(ahd);
                 ahd_clear_intstat(ahd);
                 ahd_unpause(ahd);
         }
 }
 
 static void
 ahd_handle_transmission_error(struct ahd_softc *ahd)
 {
         struct        scb *scb;
         u_int        scbid;
         u_int        lqistat1;
         u_int        lqistat2;
         u_int        msg_out;
         u_int        curphase;
         u_int        lastphase;
         u_int        perrdiag;
         u_int        cur_col;
         int        silent;
 
         scb = NULL;
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         lqistat1 = ahd_inb(ahd, LQISTAT1) & ~(LQIPHASE_LQ|LQIPHASE_NLQ);
         lqistat2 = ahd_inb(ahd, LQISTAT2);
         if ((lqistat1 & (LQICRCI_NLQ|LQICRCI_LQ)) == 0
          && (ahd->bugs & AHD_NLQICRC_DELAYED_BUG) != 0) {
                 u_int lqistate;
 
                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
                 lqistate = ahd_inb(ahd, LQISTATE);
                 if ((lqistate >= 0x1E && lqistate <= 0x24)
                  || (lqistate == 0x29)) {
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
                                 printf("%s: NLQCRC found via LQISTATE\n",
                                        ahd_name(ahd));
                         }
 #endif
                         lqistat1 |= LQICRCI_NLQ;
                 }
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         }
 
         ahd_outb(ahd, CLRLQIINT1, lqistat1);
         lastphase = ahd_inb(ahd, LASTPHASE);
         curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
         perrdiag = ahd_inb(ahd, PERRDIAG);
         msg_out = MSG_INITIATOR_DET_ERR;
         ahd_outb(ahd, CLRSINT1, CLRSCSIPERR);
         
         /*
          * Try to find the SCB associated with this error.
          */
         silent = FALSE;
         if (lqistat1 == 0
          || (lqistat1 & LQICRCI_NLQ) != 0) {
                  if ((lqistat1 & (LQICRCI_NLQ|LQIOVERI_NLQ)) != 0)
                         ahd_set_active_fifo(ahd);
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb != NULL && SCB_IS_SILENT(scb))
                         silent = TRUE;
         }
 
         cur_col = 0;
         if (silent == FALSE) {
                 printf("%s: Transmission error detected\n", ahd_name(ahd));
                 ahd_lqistat1_print(lqistat1, &cur_col, 50);
                 ahd_lastphase_print(lastphase, &cur_col, 50);
                 ahd_scsisigi_print(curphase, &cur_col, 50);
                 ahd_perrdiag_print(perrdiag, &cur_col, 50);
                 printf("\n");
                 ahd_dump_card_state(ahd);
         }
 
         if ((lqistat1 & (LQIOVERI_LQ|LQIOVERI_NLQ)) != 0) {
                 if (silent == FALSE) {
                         printf("%s: Gross protocol error during incoming "
                                "packet.  lqistat1 == 0x%x.  Resetting bus.\n",
                                ahd_name(ahd), lqistat1);
                 }
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                 return;
         } else if ((lqistat1 & LQICRCI_LQ) != 0) {
                 /*
                  * A CRC error has been detected on an incoming LQ.
                  * The bus is currently hung on the last ACK.
                  * Hit LQIRETRY to release the last ack, and
                  * wait for the sequencer to determine that ATNO
                  * is asserted while in message out to take us
                  * to our host message loop.  No NONPACKREQ or
                  * LQIPHASE type errors will occur in this
                  * scenario.  After this first LQIRETRY, the LQI
                  * manager will be in ISELO where it will
                  * happily sit until another packet phase begins.
                  * Unexpected bus free detection is enabled
                  * through any phases that occur after we release
                  * this last ack until the LQI manager sees a
                  * packet phase.  This implies we may have to
                  * ignore a perfectly valid "unexected busfree"
                  * after our "initiator detected error" message is
                  * sent.  A busfree is the expected response after
                  * we tell the target that it's L_Q was corrupted.
                  * (SPI4R09 10.7.3.3.3)
                  */
                 ahd_outb(ahd, LQCTL2, LQIRETRY);
                 printf("LQIRetry for LQICRCI_LQ to release ACK\n");
         } else if ((lqistat1 & LQICRCI_NLQ) != 0) {
                 /*
                  * We detected a CRC error in a NON-LQ packet.
                  * The hardware has varying behavior in this situation
                  * depending on whether this packet was part of a
                  * stream or not.
                  *
                  * PKT by PKT mode:
                  * The hardware has already acked the complete packet.
                  * If the target honors our outstanding ATN condition,
                  * we should be (or soon will be) in MSGOUT phase.
                  * This will trigger the LQIPHASE_LQ status bit as the
                  * hardware was expecting another LQ.  Unexpected
                  * busfree detection is enabled.  Once LQIPHASE_LQ is
                  * true (first entry into host message loop is much
                  * the same), we must clear LQIPHASE_LQ and hit
                  * LQIRETRY so the hardware is ready to handle
                  * a future LQ.  NONPACKREQ will not be asserted again
                  * once we hit LQIRETRY until another packet is
                  * processed.  The target may either go busfree
                  * or start another packet in response to our message.
                  *
                  * Read Streaming P0 asserted:
                  * If we raise ATN and the target completes the entire
                  * stream (P0 asserted during the last packet), the
                  * hardware will ack all data and return to the ISTART
                  * state.  When the target reponds to our ATN condition,
                  * LQIPHASE_LQ will be asserted.  We should respond to
                  * this with an LQIRETRY to prepare for any future
                  * packets.  NONPACKREQ will not be asserted again
                  * once we hit LQIRETRY until another packet is
                  * processed.  The target may either go busfree or
                  * start another packet in response to our message.
                  * Busfree detection is enabled.
                  *
                  * Read Streaming P0 not asserted:
                  * If we raise ATN and the target transitions to
                  * MSGOUT in or after a packet where P0 is not
                  * asserted, the hardware will assert LQIPHASE_NLQ.
                  * We should respond to the LQIPHASE_NLQ with an
                  * LQIRETRY.  Should the target stay in a non-pkt
                  * phase after we send our message, the hardware
                  * will assert LQIPHASE_LQ.  Recovery is then just as
                  * listed above for the read streaming with P0 asserted.
                  * Busfree detection is enabled.
                  */
                 if (silent == FALSE)
                         printf("LQICRC_NLQ\n");
                 if (scb == NULL) {
                         printf("%s: No SCB valid for LQICRC_NLQ.  "
                                "Resetting bus\n", ahd_name(ahd));
                         ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                         return;
                 }
         } else if ((lqistat1 & LQIBADLQI) != 0) {
                 printf("Need to handle BADLQI!\n");
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
                 return;
         } else if ((perrdiag & (PARITYERR|PREVPHASE)) == PARITYERR) {
                 if ((curphase & ~P_DATAIN_DT) != 0) {
                         /* Ack the byte.  So we can continue. */
                         if (silent == FALSE)
                                 printf("Acking %s to clear perror\n",
                                     ahd_lookup_phase_entry(curphase)->phasemsg);
                         ahd_inb(ahd, SCSIDAT);
                 }
         
                 if (curphase == P_MESGIN)
                         msg_out = MSG_PARITY_ERROR;
         }
 
         /*
          * We've set the hardware to assert ATN if we 
          * get a parity error on "in" phases, so all we
          * need to do is stuff the message buffer with
          * the appropriate message.  "In" phases have set
          * mesg_out to something other than MSG_NOP.
          */
         ahd->send_msg_perror = msg_out;
         if (scb != NULL && msg_out == MSG_INITIATOR_DET_ERR)
                 scb->flags |= SCB_TRANSMISSION_ERROR;
         ahd_outb(ahd, MSG_OUT, HOST_MSG);
         ahd_outb(ahd, CLRINT, CLRSCSIINT);
         ahd_unpause(ahd);
 }
 
 static void
 ahd_handle_lqiphase_error(struct ahd_softc *ahd, u_int lqistat1)
 {
         /*
          * Clear the sources of the interrupts.
          */
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         ahd_outb(ahd, CLRLQIINT1, lqistat1);
 
         /*
          * If the "illegal" phase changes were in response
          * to our ATN to flag a CRC error, AND we ended up
          * on packet boundaries, clear the error, restart the
          * LQI manager as appropriate, and go on our merry
          * way toward sending the message.  Otherwise, reset
          * the bus to clear the error.
          */
         ahd_set_active_fifo(ahd);
         if ((ahd_inb(ahd, SCSISIGO) & ATNO) != 0
          && (ahd_inb(ahd, MDFFSTAT) & DLZERO) != 0) {
                 if ((lqistat1 & LQIPHASE_LQ) != 0) {
                         printf("LQIRETRY for LQIPHASE_LQ\n");
                         ahd_outb(ahd, LQCTL2, LQIRETRY);
                 } else if ((lqistat1 & LQIPHASE_NLQ) != 0) {
                         printf("LQIRETRY for LQIPHASE_NLQ\n");
                         ahd_outb(ahd, LQCTL2, LQIRETRY);
                 } else
                         panic("ahd_handle_lqiphase_error: No phase errors\n");
                 ahd_dump_card_state(ahd);
                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
                 ahd_unpause(ahd);
         } else {
                 printf("Reseting Channel for LQI Phase error\n");
                 ahd_dump_card_state(ahd);
                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
         }
 }
 
 /*
  * Packetized unexpected or expected busfree.
  * Entered in mode based on busfreetime.
  */
 static int
 ahd_handle_pkt_busfree(struct ahd_softc *ahd, u_int busfreetime)
 {
         u_int lqostat1;
 
         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
         lqostat1 = ahd_inb(ahd, LQOSTAT1);
         if ((lqostat1 & LQOBUSFREE) != 0) {
                 struct scb *scb;
                 u_int scbid;
                 u_int saved_scbptr;
                 u_int waiting_h;
                 u_int waiting_t;
                 u_int next;
 
                 /*
                  * The LQO manager detected an unexpected busfree
                  * either:
                  *
                  * 1) During an outgoing LQ.
                  * 2) After an outgoing LQ but before the first
                  *    REQ of the command packet.
                  * 3) During an outgoing command packet.
                  *
                  * In all cases, CURRSCB is pointing to the
                  * SCB that encountered the failure.  Clean
                  * up the queue, clear SELDO and LQOBUSFREE,
                  * and allow the sequencer to restart the select
                  * out at its lesure.
                  */
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                 scbid = ahd_inw(ahd, CURRSCB);
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL)
                        panic("SCB not valid during LQOBUSFREE");
                 /*
                  * Clear the status.
                  */
                 ahd_outb(ahd, CLRLQOINT1, CLRLQOBUSFREE);
                 if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0)
                         ahd_outb(ahd, CLRLQOINT1, 0);
                 ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
                 ahd_flush_device_writes(ahd);
                 ahd_outb(ahd, CLRSINT0, CLRSELDO);
 
                 /*
                  * Return the LQO manager to its idle loop.  It will
                  * not do this automatically if the busfree occurs
                  * after the first REQ of either the LQ or command
                  * packet or between the LQ and command packet.
                  */
                 ahd_outb(ahd, LQCTL2, ahd_inb(ahd, LQCTL2) | LQOTOIDLE);
 
                 /*
                  * Update the waiting for selection queue so
                  * we restart on the correct SCB.
                  */
                 waiting_h = ahd_inw(ahd, WAITING_TID_HEAD);
                 saved_scbptr = ahd_get_scbptr(ahd);
                 if (waiting_h != scbid) {
 
                         ahd_outw(ahd, WAITING_TID_HEAD, scbid);
                         waiting_t = ahd_inw(ahd, WAITING_TID_TAIL);
                         if (waiting_t == waiting_h) {
                                 ahd_outw(ahd, WAITING_TID_TAIL, scbid);
                                 next = SCB_LIST_NULL;
                         } else {
                                 ahd_set_scbptr(ahd, waiting_h);
                                 next = ahd_inw_scbram(ahd, SCB_NEXT2);
                         }
                         ahd_set_scbptr(ahd, scbid);
                         ahd_outw(ahd, SCB_NEXT2, next);
                 }
                 ahd_set_scbptr(ahd, saved_scbptr);
                 if (scb->crc_retry_count < AHD_MAX_LQ_CRC_ERRORS) {
                         if (SCB_IS_SILENT(scb) == FALSE) {
                                 ahd_print_path(ahd, scb);
                                 printf("Probable outgoing LQ CRC error.  "
                                        "Retrying command\n");
                         }
                         scb->crc_retry_count++;
                 } else {
                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
                         ahd_freeze_scb(scb);
                         ahd_freeze_devq(ahd, scb);
                 }
                 /* Return unpausing the sequencer. */
                 return (0);
         } else if ((ahd_inb(ahd, PERRDIAG) & PARITYERR) != 0) {
                 /*
                  * Ignore what are really parity errors that
                  * occur on the last REQ of a free running
                  * clock prior to going busfree.  Some drives
                  * do not properly active negate just before
                  * going busfree resulting in a parity glitch.
                  */
                 ahd_outb(ahd, CLRSINT1, CLRSCSIPERR|CLRBUSFREE);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MASKED_ERRORS) != 0)
                         printf("%s: Parity on last REQ detected "
                                "during busfree phase.\n",
                                ahd_name(ahd));
 #endif
                 /* Return unpausing the sequencer. */
                 return (0);
         }
         if (ahd->src_mode != AHD_MODE_SCSI) {
                 u_int        scbid;
                 struct        scb *scb;
 
                 scbid = ahd_get_scbptr(ahd);
                 scb = ahd_lookup_scb(ahd, scbid);
                 ahd_print_path(ahd, scb);
                 printf("Unexpected PKT busfree condition\n");
                 ahd_dump_card_state(ahd);
                 ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb), 'A',
                                SCB_GET_LUN(scb), SCB_GET_TAG(scb),
                                ROLE_INITIATOR, CAM_UNEXP_BUSFREE);
 
                 /* Return restarting the sequencer. */
                 return (1);
         }
         printf("%s: Unexpected PKT busfree condition\n", ahd_name(ahd));
         ahd_dump_card_state(ahd);
         /* Restart the sequencer. */
         return (1);
 }
 
 /*
  * Non-packetized unexpected or expected busfree.
  */
 static int
 ahd_handle_nonpkt_busfree(struct ahd_softc *ahd)
 {
         struct        ahd_devinfo devinfo;
         struct        scb *scb;
         u_int        lastphase;
         u_int        saved_scsiid;
         u_int        saved_lun;
         u_int        target;
         u_int        initiator_role_id;
         u_int        scbid;
         u_int        ppr_busfree;
         int        printerror;
 
         /*
          * Look at what phase we were last in.  If its message out,
          * chances are pretty good that the busfree was in response
          * to one of our abort requests.
          */
         lastphase = ahd_inb(ahd, LASTPHASE);
         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
         saved_lun = ahd_inb(ahd, SAVED_LUN);
         target = SCSIID_TARGET(ahd, saved_scsiid);
         initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
         ahd_compile_devinfo(&devinfo, initiator_role_id,
                             target, saved_lun, 'A', ROLE_INITIATOR);
         printerror = 1;
 
         scbid = ahd_get_scbptr(ahd);
         scb = ahd_lookup_scb(ahd, scbid);
         if (scb != NULL
          && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
                 scb = NULL;
 
         ppr_busfree = (ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0;
         if (lastphase == P_MESGOUT) {
                 u_int tag;
 
                 tag = SCB_LIST_NULL;
                 if (ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT_TAG, TRUE)
                  || ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT, TRUE)) {
                         int found;
                         int sent_msg;
 
                         if (scb == NULL) {
                                 ahd_print_devinfo(ahd, &devinfo);
                                 printf("Abort for unidentified "
                                        "connection completed.\n");
                                 /* restart the sequencer. */
                                 return (1);
                         }
                         sent_msg = ahd->msgout_buf[ahd->msgout_index - 1];
                         ahd_print_path(ahd, scb);
                         printf("SCB %d - Abort%s Completed.\n",
                                SCB_GET_TAG(scb),
                                sent_msg == MSG_ABORT_TAG ? "" : " Tag");
 
                         if (sent_msg == MSG_ABORT_TAG)
                                 tag = SCB_GET_TAG(scb);
 
                         if ((scb->flags & SCB_EXTERNAL_RESET) != 0) {
                                 /*
                                  * This abort is in response to an
                                  * unexpected switch to command phase
                                  * for a packetized connection.  Since
                                  * the identify message was never sent,
                                  * "saved lun" is 0.  We really want to
                                  * abort only the SCB that encountered
                                  * this error, which could have a different
                                  * lun.  The SCB will be retried so the OS
                                  * will see the UA after renegotiating to
                                  * packetized.
                                  */
                                 tag = SCB_GET_TAG(scb);
                                 saved_lun = scb->hscb->lun;
                         }
                         found = ahd_abort_scbs(ahd, target, 'A', saved_lun,
                                                tag, ROLE_INITIATOR,
                                                CAM_REQ_ABORTED);
                         printf("found == 0x%x\n", found);
                         printerror = 0;
                 } else if (ahd_sent_msg(ahd, AHDMSG_1B,
                                         MSG_BUS_DEV_RESET, TRUE)) {
 #ifdef __FreeBSD__
                         /*
                          * Don't mark the user's request for this BDR
                          * as completing with CAM_BDR_SENT.  CAM3
                          * specifies CAM_REQ_CMP.
                          */
                         if (scb != NULL
                          && scb->io_ctx->ccb_h.func_code== XPT_RESET_DEV
                          && ahd_match_scb(ahd, scb, target, 'A',
                                           CAM_LUN_WILDCARD, SCB_LIST_NULL,
                                           ROLE_INITIATOR))
                                 ahd_set_transaction_status(scb, CAM_REQ_CMP);
 #endif
                         ahd_handle_devreset(ahd, &devinfo, CAM_LUN_WILDCARD,
                                             CAM_BDR_SENT, "Bus Device Reset",
                                             /*verbose_level*/0);
                         printerror = 0;
                 } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, FALSE)
                         && ppr_busfree == 0) {
                         struct ahd_initiator_tinfo *tinfo;
                         struct ahd_tmode_tstate *tstate;
 
                         /*
                          * PPR Rejected.
                          *
                          * If the previous negotiation was packetized,
                          * this could be because the device has been
                          * reset without our knowledge.  Force our
                          * current negotiation to async and retry the
                          * negotiation.  Otherwise retry the command
                          * with non-ppr negotiation.
                          */
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf("PPR negotiation rejected busfree.\n");
 #endif
                         tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
                                                     devinfo.our_scsiid,
                                                     devinfo.target, &tstate);
                         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ)!=0) {
                                 ahd_set_width(ahd, &devinfo,
                                               MSG_EXT_WDTR_BUS_8_BIT,
                                               AHD_TRANS_CUR,
                                               /*paused*/TRUE);
                                 ahd_set_syncrate(ahd, &devinfo,
                                                 /*period*/0, /*offset*/0,
                                                 /*ppr_options*/0,
                                                 AHD_TRANS_CUR,
                                                 /*paused*/TRUE);
                                 /*
                                  * The expect PPR busfree handler below
                                  * will effect the retry and necessary
                                  * abort.
                                  */
                         } else {
                                 tinfo->curr.transport_version = 2;
                                 tinfo->goal.transport_version = 2;
                                 tinfo->goal.ppr_options = 0;
                                 /*
                                  * Remove any SCBs in the waiting for selection
                                  * queue that may also be for this target so
                                  * that command ordering is preserved.
                                  */
                                 ahd_freeze_devq(ahd, scb);
                                 ahd_qinfifo_requeue_tail(ahd, scb);
                                 printerror = 0;
                         }
                 } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, FALSE)
                         && ppr_busfree == 0) {
                         /*
                          * Negotiation Rejected.  Go-narrow and
                          * retry command.
                          */
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf("WDTR negotiation rejected busfree.\n");
 #endif
                         ahd_set_width(ahd, &devinfo,
                                       MSG_EXT_WDTR_BUS_8_BIT,
                                       AHD_TRANS_CUR|AHD_TRANS_GOAL,
                                       /*paused*/TRUE);
                         /*
                          * Remove any SCBs in the waiting for selection
                          * queue that may also be for this target so that
                          * command ordering is preserved.
                          */
                         ahd_freeze_devq(ahd, scb);
                         ahd_qinfifo_requeue_tail(ahd, scb);
                         printerror = 0;
                 } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, FALSE)
                         && ppr_busfree == 0) {
                         /*
                          * Negotiation Rejected.  Go-async and
                          * retry command.
                          */
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf("SDTR negotiation rejected busfree.\n");
 #endif
                         ahd_set_syncrate(ahd, &devinfo,
                                         /*period*/0, /*offset*/0,
                                         /*ppr_options*/0,
                                         AHD_TRANS_CUR|AHD_TRANS_GOAL,
                                         /*paused*/TRUE);
                         /*
                          * Remove any SCBs in the waiting for selection
                          * queue that may also be for this target so that
                          * command ordering is preserved.
                          */
                         ahd_freeze_devq(ahd, scb);
                         ahd_qinfifo_requeue_tail(ahd, scb);
                         printerror = 0;
                 } else if ((ahd->msg_flags & MSG_FLAG_EXPECT_IDE_BUSFREE) != 0
                         && ahd_sent_msg(ahd, AHDMSG_1B,
                                          MSG_INITIATOR_DET_ERR, TRUE)) {
 
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf("Expected IDE Busfree\n");
 #endif
                         printerror = 0;
                 } else if ((ahd->msg_flags & MSG_FLAG_EXPECT_QASREJ_BUSFREE)
                         && ahd_sent_msg(ahd, AHDMSG_1B,
                                         MSG_MESSAGE_REJECT, TRUE)) {
 
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf("Expected QAS Reject Busfree\n");
 #endif
                         printerror = 0;
                 }
         }
 
         /*
          * The busfree required flag is honored at the end of
          * the message phases.  We check it last in case we
          * had to send some other message that caused a busfree.
          */
         if (printerror != 0
          && (lastphase == P_MESGIN || lastphase == P_MESGOUT)
          && ((ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0)) {
 
                 ahd_freeze_devq(ahd, scb);
                 ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
                 ahd_freeze_scb(scb);
                 if ((ahd->msg_flags & MSG_FLAG_IU_REQ_CHANGED) != 0) {
                         ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
                                        SCB_GET_CHANNEL(ahd, scb),
                                        SCB_GET_LUN(scb), SCB_LIST_NULL,
                                        ROLE_INITIATOR, CAM_REQ_ABORTED);
                 } else {
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf("PPR Negotiation Busfree.\n");
 #endif
                         ahd_done(ahd, scb);
                 }
                 printerror = 0;
         }
         if (printerror != 0) {
                 int aborted;
 
                 aborted = 0;
                 if (scb != NULL) {
                         u_int tag;
 
                         if ((scb->hscb->control & TAG_ENB) != 0)
                                 tag = SCB_GET_TAG(scb);
                         else
                                 tag = SCB_LIST_NULL;
                         ahd_print_path(ahd, scb);
                         aborted = ahd_abort_scbs(ahd, target, 'A',
                                        SCB_GET_LUN(scb), tag,
                                        ROLE_INITIATOR,
                                        CAM_UNEXP_BUSFREE);
                 } else {
                         /*
                          * We had not fully identified this connection,
                          * so we cannot abort anything.
                          */
                         printf("%s: ", ahd_name(ahd));
                 }
                 printf("Unexpected busfree %s, %d SCBs aborted, "
                        "PRGMCNT == 0x%x\n",
                        ahd_lookup_phase_entry(lastphase)->phasemsg,
                        aborted,
                        ahd_inw(ahd, PRGMCNT));
                 ahd_dump_card_state(ahd);
                 if (lastphase != P_BUSFREE)
                         ahd_force_renegotiation(ahd, &devinfo);
         }
         /* Always restart the sequencer. */
         return (1);
 }
 
 static void
 ahd_handle_proto_violation(struct ahd_softc *ahd)
 {
         struct        ahd_devinfo devinfo;
         struct        scb *scb;
         u_int        scbid;
         u_int        seq_flags;
         u_int        curphase;
         u_int        lastphase;
         int        found;
 
         ahd_fetch_devinfo(ahd, &devinfo);
         scbid = ahd_get_scbptr(ahd);
         scb = ahd_lookup_scb(ahd, scbid);
         seq_flags = ahd_inb(ahd, SEQ_FLAGS);
         curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
         lastphase = ahd_inb(ahd, LASTPHASE);
         if ((seq_flags & NOT_IDENTIFIED) != 0) {
 
                 /*
                  * The reconnecting target either did not send an
                  * identify message, or did, but we didn't find an SCB
                  * to match.
                  */
                 ahd_print_devinfo(ahd, &devinfo);
                 printf("Target did not send an IDENTIFY message. "
                        "LASTPHASE = 0x%x.\n", lastphase);
                 scb = NULL;
         } else if (scb == NULL) {
                 /*
                  * We don't seem to have an SCB active for this
                  * transaction.  Print an error and reset the bus.
                  */
                 ahd_print_devinfo(ahd, &devinfo);
                 printf("No SCB found during protocol violation\n");
                 goto proto_violation_reset;
         } else {
                 ahd_set_transaction_status(scb, CAM_SEQUENCE_FAIL);
                 if ((seq_flags & NO_CDB_SENT) != 0) {
                         ahd_print_path(ahd, scb);
                         printf("No or incomplete CDB sent to device.\n");
                 } else if ((ahd_inb_scbram(ahd, SCB_CONTROL)
                           & STATUS_RCVD) == 0) {
                         /*
                          * The target never bothered to provide status to
                          * us prior to completing the command.  Since we don't
                          * know the disposition of this command, we must attempt
                          * to abort it.  Assert ATN and prepare to send an abort
                          * message.
                          */
                         ahd_print_path(ahd, scb);
                         printf("Completed command without status.\n");
                 } else {
                         ahd_print_path(ahd, scb);
                         printf("Unknown protocol violation.\n");
                         ahd_dump_card_state(ahd);
                 }
         }
         if ((lastphase & ~P_DATAIN_DT) == 0
          || lastphase == P_COMMAND) {
 proto_violation_reset:
                 /*
                  * Target either went directly to data
                  * phase or didn't respond to our ATN.
                  * The only safe thing to do is to blow
                  * it away with a bus reset.
                  */
                 found = ahd_reset_channel(ahd, 'A', TRUE);
                 printf("%s: Issued Channel %c Bus Reset. "
                        "%d SCBs aborted\n", ahd_name(ahd), 'A', found);
         } else {
                 /*
                  * Leave the selection hardware off in case
                  * this abort attempt will affect yet to
                  * be sent commands.
                  */
                 ahd_outb(ahd, SCSISEQ0,
                          ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
                 ahd_assert_atn(ahd);
                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
                 if (scb == NULL) {
                         ahd_print_devinfo(ahd, &devinfo);
                         ahd->msgout_buf[0] = MSG_ABORT_TASK;
                         ahd->msgout_len = 1;
                         ahd->msgout_index = 0;
                         ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
                 } else {
                         ahd_print_path(ahd, scb);
                         scb->flags |= SCB_ABORT;
                 }
                 printf("Protocol violation %s.  Attempting to abort.\n",
                        ahd_lookup_phase_entry(curphase)->phasemsg);
         }
 }
 
 /*
  * Force renegotiation to occur the next time we initiate
  * a command to the current device.
  */
 static void
 ahd_force_renegotiation(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         struct        ahd_initiator_tinfo *targ_info;
         struct        ahd_tmode_tstate *tstate;
 
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                 ahd_print_devinfo(ahd, devinfo);
                 printf("Forcing renegotiation\n");
         }
 #endif
         targ_info = ahd_fetch_transinfo(ahd,
                                         devinfo->channel,
                                         devinfo->our_scsiid,
                                         devinfo->target,
                                         &tstate);
         ahd_update_neg_request(ahd, devinfo, tstate,
                                targ_info, AHD_NEG_IF_NON_ASYNC);
 }
 
 #define AHD_MAX_STEPS 2000
 static void
 ahd_clear_critical_section(struct ahd_softc *ahd)
 {
         ahd_mode_state        saved_modes;
         int                stepping;
         int                steps;
         int                first_instr;
         u_int                simode0;
         u_int                simode1;
         u_int                simode3;
         u_int                lqimode0;
         u_int                lqimode1;
         u_int                lqomode0;
         u_int                lqomode1;
 
         if (ahd->num_critical_sections == 0)
                 return;
 
         stepping = FALSE;
         steps = 0;
         first_instr = 0;
         simode0 = 0;
         simode1 = 0;
         simode3 = 0;
         lqimode0 = 0;
         lqimode1 = 0;
         lqomode0 = 0;
         lqomode1 = 0;
         saved_modes = ahd_save_modes(ahd);
         for (;;) {
                 struct        cs *cs;
                 u_int        seqaddr;
                 u_int        i;
 
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                 seqaddr = ahd_inw(ahd, CURADDR);
 
                 cs = ahd->critical_sections;
                 for (i = 0; i < ahd->num_critical_sections; i++, cs++) {
                         
                         if (cs->begin < seqaddr && cs->end >= seqaddr)
                                 break;
                 }
 
                 if (i == ahd->num_critical_sections)
                         break;
 
                 if (steps > AHD_MAX_STEPS) {
                         printf("%s: Infinite loop in critical section\n"
                                "%s: First Instruction 0x%x now 0x%x\n",
                                ahd_name(ahd), ahd_name(ahd), first_instr,
                                seqaddr);
                         ahd_dump_card_state(ahd);
                         panic("critical section loop");
                 }
 
                 steps++;
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
                         printf("%s: Single stepping at 0x%x\n", ahd_name(ahd),
                                seqaddr);
 #endif
                 if (stepping == FALSE) {
 
                         first_instr = seqaddr;
                           ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
                           simode0 = ahd_inb(ahd, SIMODE0);
                         simode3 = ahd_inb(ahd, SIMODE3);
                         lqimode0 = ahd_inb(ahd, LQIMODE0);
                         lqimode1 = ahd_inb(ahd, LQIMODE1);
                         lqomode0 = ahd_inb(ahd, LQOMODE0);
                         lqomode1 = ahd_inb(ahd, LQOMODE1);
                         ahd_outb(ahd, SIMODE0, 0);
                         ahd_outb(ahd, SIMODE3, 0);
                         ahd_outb(ahd, LQIMODE0, 0);
                         ahd_outb(ahd, LQIMODE1, 0);
                         ahd_outb(ahd, LQOMODE0, 0);
                         ahd_outb(ahd, LQOMODE1, 0);
                         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                         simode1 = ahd_inb(ahd, SIMODE1);
                         /*
                          * We don't clear ENBUSFREE.  Unfortunately
                          * we cannot re-enable busfree detection within
                          * the current connection, so we must leave it
                          * on while single stepping.
                          */
                         ahd_outb(ahd, SIMODE1, simode1 & ENBUSFREE);
                         ahd_outb(ahd, SEQCTL0, ahd_inb(ahd, SEQCTL0) | STEP);
                         stepping = TRUE;
                 }
                 ahd_outb(ahd, CLRSINT1, CLRBUSFREE);
                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
                 ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
                 ahd_outb(ahd, HCNTRL, ahd->unpause);
                 while (!ahd_is_paused(ahd))
                         ahd_delay(200);
                 ahd_update_modes(ahd);
         }
         if (stepping) {
                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
                 ahd_outb(ahd, SIMODE0, simode0);
                 ahd_outb(ahd, SIMODE3, simode3);
                 ahd_outb(ahd, LQIMODE0, lqimode0);
                 ahd_outb(ahd, LQIMODE1, lqimode1);
                 ahd_outb(ahd, LQOMODE0, lqomode0);
                 ahd_outb(ahd, LQOMODE1, lqomode1);
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                 ahd_outb(ahd, SEQCTL0, ahd_inb(ahd, SEQCTL0) & ~STEP);
                   ahd_outb(ahd, SIMODE1, simode1);
                 /*
                  * SCSIINT seems to glitch occassionally when
                  * the interrupt masks are restored.  Clear SCSIINT
                  * one more time so that only persistent errors
                  * are seen as a real interrupt.
                  */
                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
         }
         ahd_restore_modes(ahd, saved_modes);
 }
 
 /*
  * Clear any pending interrupt status.
  */
 static void
 ahd_clear_intstat(struct ahd_softc *ahd)
 {
         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
         /* Clear any interrupt conditions this may have caused */
         ahd_outb(ahd, CLRLQIINT0, CLRLQIATNQAS|CLRLQICRCT1|CLRLQICRCT2
                                  |CLRLQIBADLQT|CLRLQIATNLQ|CLRLQIATNCMD);
         ahd_outb(ahd, CLRLQIINT1, CLRLQIPHASE_LQ|CLRLQIPHASE_NLQ|CLRLIQABORT
                                  |CLRLQICRCI_LQ|CLRLQICRCI_NLQ|CLRLQIBADLQI
                                  |CLRLQIOVERI_LQ|CLRLQIOVERI_NLQ|CLRNONPACKREQ);
         ahd_outb(ahd, CLRLQOINT0, CLRLQOTARGSCBPERR|CLRLQOSTOPT2|CLRLQOATNLQ
                                  |CLRLQOATNPKT|CLRLQOTCRC);
         ahd_outb(ahd, CLRLQOINT1, CLRLQOINITSCBPERR|CLRLQOSTOPI2|CLRLQOBADQAS
                                  |CLRLQOBUSFREE|CLRLQOPHACHGINPKT);
         if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
                 ahd_outb(ahd, CLRLQOINT0, 0);
                 ahd_outb(ahd, CLRLQOINT1, 0);
         }
         ahd_outb(ahd, CLRSINT3, CLRNTRAMPERR|CLROSRAMPERR);
         ahd_outb(ahd, CLRSINT1, CLRSELTIMEO|CLRATNO|CLRSCSIRSTI
                                 |CLRBUSFREE|CLRSCSIPERR|CLRREQINIT);
         ahd_outb(ahd, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO
                                 |CLRIOERR|CLROVERRUN);
         ahd_outb(ahd, CLRINT, CLRSCSIINT);
 }
 
 /**************************** Debugging Routines ******************************/
 #ifdef AHD_DEBUG
 uint32_t ahd_debug = AHD_DEBUG_OPTS;
 #endif
 
 #if 0
 void
 ahd_print_scb(struct scb *scb)
 {
         struct hardware_scb *hscb;
         int i;
 
         hscb = scb->hscb;
         printf("scb:%p control:0x%x scsiid:0x%x lun:%d cdb_len:%d\n",
                (void *)scb,
                hscb->control,
                hscb->scsiid,
                hscb->lun,
                hscb->cdb_len);
         printf("Shared Data: ");
         for (i = 0; i < sizeof(hscb->shared_data.idata.cdb); i++)
                 printf("%#02x", hscb->shared_data.idata.cdb[i]);
         printf("        dataptr:%#x%x datacnt:%#x sgptr:%#x tag:%#x\n",
                (uint32_t)((ahd_le64toh(hscb->dataptr) >> 32) & 0xFFFFFFFF),
                (uint32_t)(ahd_le64toh(hscb->dataptr) & 0xFFFFFFFF),
                ahd_le32toh(hscb->datacnt),
                ahd_le32toh(hscb->sgptr),
                SCB_GET_TAG(scb));
         ahd_dump_sglist(scb);
 }
 #endif  /*  0  */
 
 /************************* Transfer Negotiation *******************************/
 /*
  * Allocate per target mode instance (ID we respond to as a target)
  * transfer negotiation data structures.
  */
 static struct ahd_tmode_tstate *
 ahd_alloc_tstate(struct ahd_softc *ahd, u_int scsi_id, char channel)
 {
         struct ahd_tmode_tstate *master_tstate;
         struct ahd_tmode_tstate *tstate;
         int i;
 
         master_tstate = ahd->enabled_targets[ahd->our_id];
         if (ahd->enabled_targets[scsi_id] != NULL
          && ahd->enabled_targets[scsi_id] != master_tstate)
                 panic("%s: ahd_alloc_tstate - Target already allocated",
                       ahd_name(ahd));
         tstate = malloc(sizeof(*tstate), M_DEVBUF, M_NOWAIT);
         if (tstate == NULL)
                 return (NULL);
 
         /*
          * If we have allocated a master tstate, copy user settings from
          * the master tstate (taken from SRAM or the EEPROM) for this
          * channel, but reset our current and goal settings to async/narrow
          * until an initiator talks to us.
          */
         if (master_tstate != NULL) {
                 memcpy(tstate, master_tstate, sizeof(*tstate));
                 memset(tstate->enabled_luns, 0, sizeof(tstate->enabled_luns));
                 for (i = 0; i < 16; i++) {
                         memset(&tstate->transinfo[i].curr, 0,
                               sizeof(tstate->transinfo[i].curr));
                         memset(&tstate->transinfo[i].goal, 0,
                               sizeof(tstate->transinfo[i].goal));
                 }
         } else
                 memset(tstate, 0, sizeof(*tstate));
         ahd->enabled_targets[scsi_id] = tstate;
         return (tstate);
 }
 
 #ifdef AHD_TARGET_MODE
 /*
  * Free per target mode instance (ID we respond to as a target)
  * transfer negotiation data structures.
  */
 static void
 ahd_free_tstate(struct ahd_softc *ahd, u_int scsi_id, char channel, int force)
 {
         struct ahd_tmode_tstate *tstate;
 
         /*
          * Don't clean up our "master" tstate.
          * It has our default user settings.
          */
         if (scsi_id == ahd->our_id
          && force == FALSE)
                 return;
 
         tstate = ahd->enabled_targets[scsi_id];
         if (tstate != NULL)
                 free(tstate, M_DEVBUF);
         ahd->enabled_targets[scsi_id] = NULL;
 }
 #endif
 
 /*
  * Called when we have an active connection to a target on the bus,
  * this function finds the nearest period to the input period limited
  * by the capabilities of the bus connectivity of and sync settings for
  * the target.
  */
 static void
 ahd_devlimited_syncrate(struct ahd_softc *ahd,
                         struct ahd_initiator_tinfo *tinfo,
                         u_int *period, u_int *ppr_options, role_t role)
 {
         struct        ahd_transinfo *transinfo;
         u_int        maxsync;
 
         if ((ahd_inb(ahd, SBLKCTL) & ENAB40) != 0
          && (ahd_inb(ahd, SSTAT2) & EXP_ACTIVE) == 0) {
                 maxsync = AHD_SYNCRATE_PACED;
         } else {
                 maxsync = AHD_SYNCRATE_ULTRA;
                 /* Can't do DT related options on an SE bus */
                 *ppr_options &= MSG_EXT_PPR_QAS_REQ;
         }
         /*
          * Never allow a value higher than our current goal
          * period otherwise we may allow a target initiated
          * negotiation to go above the limit as set by the
          * user.  In the case of an initiator initiated
          * sync negotiation, we limit based on the user
          * setting.  This allows the system to still accept
          * incoming negotiations even if target initiated
          * negotiation is not performed.
          */
         if (role == ROLE_TARGET)
                 transinfo = &tinfo->user;
         else 
                 transinfo = &tinfo->goal;
         *ppr_options &= (transinfo->ppr_options|MSG_EXT_PPR_PCOMP_EN);
         if (transinfo->width == MSG_EXT_WDTR_BUS_8_BIT) {
                 maxsync = max(maxsync, (u_int)AHD_SYNCRATE_ULTRA2);
                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
         }
         if (transinfo->period == 0) {
                 *period = 0;
                 *ppr_options = 0;
         } else {
                 *period = max(*period, (u_int)transinfo->period);
                 ahd_find_syncrate(ahd, period, ppr_options, maxsync);
         }
 }
 
 /*
  * Look up the valid period to SCSIRATE conversion in our table.
  * Return the period and offset that should be sent to the target
  * if this was the beginning of an SDTR.
  */
 void
 ahd_find_syncrate(struct ahd_softc *ahd, u_int *period,
                   u_int *ppr_options, u_int maxsync)
 {
         if (*period < maxsync)
                 *period = maxsync;
 
         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) != 0
          && *period > AHD_SYNCRATE_MIN_DT)
                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
                 
         if (*period > AHD_SYNCRATE_MIN)
                 *period = 0;
 
         /* Honor PPR option conformance rules. */
         if (*period > AHD_SYNCRATE_PACED)
                 *ppr_options &= ~MSG_EXT_PPR_RTI;
 
         if ((*ppr_options & MSG_EXT_PPR_IU_REQ) == 0)
                 *ppr_options &= (MSG_EXT_PPR_DT_REQ|MSG_EXT_PPR_QAS_REQ);
 
         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) == 0)
                 *ppr_options &= MSG_EXT_PPR_QAS_REQ;
 
         /* Skip all PACED only entries if IU is not available */
         if ((*ppr_options & MSG_EXT_PPR_IU_REQ) == 0
          && *period < AHD_SYNCRATE_DT)
                 *period = AHD_SYNCRATE_DT;
 
         /* Skip all DT only entries if DT is not available */
         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) == 0
          && *period < AHD_SYNCRATE_ULTRA2)
                 *period = AHD_SYNCRATE_ULTRA2;
 }
 
 /*
  * Truncate the given synchronous offset to a value the
  * current adapter type and syncrate are capable of.
  */
 static void
 ahd_validate_offset(struct ahd_softc *ahd,
                     struct ahd_initiator_tinfo *tinfo,
                     u_int period, u_int *offset, int wide,
                     role_t role)
 {
         u_int maxoffset;
 
         /* Limit offset to what we can do */
         if (period == 0)
                 maxoffset = 0;
         else if (period <= AHD_SYNCRATE_PACED) {
                 if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0)
                         maxoffset = MAX_OFFSET_PACED_BUG;
                 else
                         maxoffset = MAX_OFFSET_PACED;
         } else
                 maxoffset = MAX_OFFSET_NON_PACED;
         *offset = min(*offset, maxoffset);
         if (tinfo != NULL) {
                 if (role == ROLE_TARGET)
                         *offset = min(*offset, (u_int)tinfo->user.offset);
                 else
                         *offset = min(*offset, (u_int)tinfo->goal.offset);
         }
 }
 
 /*
  * Truncate the given transfer width parameter to a value the
  * current adapter type is capable of.
  */
 static void
 ahd_validate_width(struct ahd_softc *ahd, struct ahd_initiator_tinfo *tinfo,
                    u_int *bus_width, role_t role)
 {
         switch (*bus_width) {
         default:
                 if (ahd->features & AHD_WIDE) {
                         /* Respond Wide */
                         *bus_width = MSG_EXT_WDTR_BUS_16_BIT;
                         break;
                 }
                 /* FALLTHROUGH */
         case MSG_EXT_WDTR_BUS_8_BIT:
                 *bus_width = MSG_EXT_WDTR_BUS_8_BIT;
                 break;
         }
         if (tinfo != NULL) {
                 if (role == ROLE_TARGET)
                         *bus_width = min((u_int)tinfo->user.width, *bus_width);
                 else
                         *bus_width = min((u_int)tinfo->goal.width, *bus_width);
         }
 }
 
 /*
  * Update the bitmask of targets for which the controller should
  * negotiate with at the next convenient oportunity.  This currently
  * means the next time we send the initial identify messages for
  * a new transaction.
  */
 int
 ahd_update_neg_request(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                        struct ahd_tmode_tstate *tstate,
                        struct ahd_initiator_tinfo *tinfo, ahd_neg_type neg_type)
 {
         u_int auto_negotiate_orig;
 
         auto_negotiate_orig = tstate->auto_negotiate;
         if (neg_type == AHD_NEG_ALWAYS) {
                 /*
                  * Force our "current" settings to be
                  * unknown so that unless a bus reset
                  * occurs the need to renegotiate is
                  * recorded persistently.
                  */
                 if ((ahd->features & AHD_WIDE) != 0)
                         tinfo->curr.width = AHD_WIDTH_UNKNOWN;
                 tinfo->curr.period = AHD_PERIOD_UNKNOWN;
                 tinfo->curr.offset = AHD_OFFSET_UNKNOWN;
         }
         if (tinfo->curr.period != tinfo->goal.period
          || tinfo->curr.width != tinfo->goal.width
          || tinfo->curr.offset != tinfo->goal.offset
          || tinfo->curr.ppr_options != tinfo->goal.ppr_options
          || (neg_type == AHD_NEG_IF_NON_ASYNC
           && (tinfo->goal.offset != 0
            || tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT
            || tinfo->goal.ppr_options != 0)))
                 tstate->auto_negotiate |= devinfo->target_mask;
         else
                 tstate->auto_negotiate &= ~devinfo->target_mask;
 
         return (auto_negotiate_orig != tstate->auto_negotiate);
 }
 
 /*
  * Update the user/goal/curr tables of synchronous negotiation
  * parameters as well as, in the case of a current or active update,
  * any data structures on the host controller.  In the case of an
  * active update, the specified target is currently talking to us on
  * the bus, so the transfer parameter update must take effect
  * immediately.
  */
 void
 ahd_set_syncrate(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                  u_int period, u_int offset, u_int ppr_options,
                  u_int type, int paused)
 {
         struct        ahd_initiator_tinfo *tinfo;
         struct        ahd_tmode_tstate *tstate;
         u_int        old_period;
         u_int        old_offset;
         u_int        old_ppr;
         int        active;
         int        update_needed;
 
         active = (type & AHD_TRANS_ACTIVE) == AHD_TRANS_ACTIVE;
         update_needed = 0;
 
         if (period == 0 || offset == 0) {
                 period = 0;
                 offset = 0;
         }
 
         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
                                     devinfo->target, &tstate);
 
         if ((type & AHD_TRANS_USER) != 0) {
                 tinfo->user.period = period;
                 tinfo->user.offset = offset;
                 tinfo->user.ppr_options = ppr_options;
         }
 
         if ((type & AHD_TRANS_GOAL) != 0) {
                 tinfo->goal.period = period;
                 tinfo->goal.offset = offset;
                 tinfo->goal.ppr_options = ppr_options;
         }
 
         old_period = tinfo->curr.period;
         old_offset = tinfo->curr.offset;
         old_ppr           = tinfo->curr.ppr_options;
 
         if ((type & AHD_TRANS_CUR) != 0
          && (old_period != period
           || old_offset != offset
           || old_ppr != ppr_options)) {
 
                 update_needed++;
 
                 tinfo->curr.period = period;
                 tinfo->curr.offset = offset;
                 tinfo->curr.ppr_options = ppr_options;
 
                 ahd_send_async(ahd, devinfo->channel, devinfo->target,
                                CAM_LUN_WILDCARD, AC_TRANSFER_NEG);
                 if (bootverbose) {
                         if (offset != 0) {
                                 int options;
 
                                 printf("%s: target %d synchronous with "
                                        "period = 0x%x, offset = 0x%x",
                                        ahd_name(ahd), devinfo->target,
                                        period, offset);
                                 options = 0;
                                 if ((ppr_options & MSG_EXT_PPR_RD_STRM) != 0) {
                                         printf("(RDSTRM");
                                         options++;
                                 }
                                 if ((ppr_options & MSG_EXT_PPR_DT_REQ) != 0) {
                                         printf("%s", options ? "|DT" : "(DT");
                                         options++;
                                 }
                                 if ((ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
                                         printf("%s", options ? "|IU" : "(IU");
                                         options++;
                                 }
                                 if ((ppr_options & MSG_EXT_PPR_RTI) != 0) {
                                         printf("%s", options ? "|RTI" : "(RTI");
                                         options++;
                                 }
                                 if ((ppr_options & MSG_EXT_PPR_QAS_REQ) != 0) {
                                         printf("%s", options ? "|QAS" : "(QAS");
                                         options++;
                                 }
                                 if (options != 0)
                                         printf(")\n");
                                 else
                                         printf("\n");
                         } else {
                                 printf("%s: target %d using "
                                        "asynchronous transfers%s\n",
                                        ahd_name(ahd), devinfo->target,
                                        (ppr_options & MSG_EXT_PPR_QAS_REQ) != 0
                                      ?  "(QAS)" : "");
                         }
                 }
         }
         /*
          * Always refresh the neg-table to handle the case of the
          * sequencer setting the ENATNO bit for a MK_MESSAGE request.
          * We will always renegotiate in that case if this is a
          * packetized request.  Also manage the busfree expected flag
          * from this common routine so that we catch changes due to
          * WDTR or SDTR messages.
          */
         if ((type & AHD_TRANS_CUR) != 0) {
                 if (!paused)
                         ahd_pause(ahd);
                 ahd_update_neg_table(ahd, devinfo, &tinfo->curr);
                 if (!paused)
                         ahd_unpause(ahd);
                 if (ahd->msg_type != MSG_TYPE_NONE) {
                         if ((old_ppr & MSG_EXT_PPR_IU_REQ)
                          != (ppr_options & MSG_EXT_PPR_IU_REQ)) {
 #ifdef AHD_DEBUG
                                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                                         ahd_print_devinfo(ahd, devinfo);
                                         printf("Expecting IU Change busfree\n");
                                 }
 #endif
                                 ahd->msg_flags |= MSG_FLAG_EXPECT_PPR_BUSFREE
                                                |  MSG_FLAG_IU_REQ_CHANGED;
                         }
                         if ((old_ppr & MSG_EXT_PPR_IU_REQ) != 0) {
 #ifdef AHD_DEBUG
                                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                         printf("PPR with IU_REQ outstanding\n");
 #endif
                                 ahd->msg_flags |= MSG_FLAG_EXPECT_PPR_BUSFREE;
                         }
                 }
         }
 
         update_needed += ahd_update_neg_request(ahd, devinfo, tstate,
                                                 tinfo, AHD_NEG_TO_GOAL);
 
         if (update_needed && active)
                 ahd_update_pending_scbs(ahd);
 }
 
 /*
  * Update the user/goal/curr tables of wide negotiation
  * parameters as well as, in the case of a current or active update,
  * any data structures on the host controller.  In the case of an
  * active update, the specified target is currently talking to us on
  * the bus, so the transfer parameter update must take effect
  * immediately.
  */
 void
 ahd_set_width(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
               u_int width, u_int type, int paused)
 {
         struct        ahd_initiator_tinfo *tinfo;
         struct        ahd_tmode_tstate *tstate;
         u_int        oldwidth;
         int        active;
         int        update_needed;
 
         active = (type & AHD_TRANS_ACTIVE) == AHD_TRANS_ACTIVE;
         update_needed = 0;
         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
                                     devinfo->target, &tstate);
 
         if ((type & AHD_TRANS_USER) != 0)
                 tinfo->user.width = width;
 
         if ((type & AHD_TRANS_GOAL) != 0)
                 tinfo->goal.width = width;
 
         oldwidth = tinfo->curr.width;
         if ((type & AHD_TRANS_CUR) != 0 && oldwidth != width) {
 
                 update_needed++;
 
                 tinfo->curr.width = width;
                 ahd_send_async(ahd, devinfo->channel, devinfo->target,
                                CAM_LUN_WILDCARD, AC_TRANSFER_NEG);
                 if (bootverbose) {
                         printf("%s: target %d using %dbit transfers\n",
                                ahd_name(ahd), devinfo->target,
                                8 * (0x01 << width));
                 }
         }
 
         if ((type & AHD_TRANS_CUR) != 0) {
                 if (!paused)
                         ahd_pause(ahd);
                 ahd_update_neg_table(ahd, devinfo, &tinfo->curr);
                 if (!paused)
                         ahd_unpause(ahd);
         }
 
         update_needed += ahd_update_neg_request(ahd, devinfo, tstate,
                                                 tinfo, AHD_NEG_TO_GOAL);
         if (update_needed && active)
                 ahd_update_pending_scbs(ahd);
 
 }
 
 /*
  * Update the current state of tagged queuing for a given target.
  */
 static void
 ahd_set_tags(struct ahd_softc *ahd, struct scsi_cmnd *cmd,
              struct ahd_devinfo *devinfo, ahd_queue_alg alg)
 {
         struct scsi_device *sdev = cmd->device;
 
         ahd_platform_set_tags(ahd, sdev, devinfo, alg);
         ahd_send_async(ahd, devinfo->channel, devinfo->target,
                        devinfo->lun, AC_TRANSFER_NEG);
 }
 
 static void
 ahd_update_neg_table(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                      struct ahd_transinfo *tinfo)
 {
         ahd_mode_state        saved_modes;
         u_int                period;
         u_int                ppr_opts;
         u_int                con_opts;
         u_int                offset;
         u_int                saved_negoaddr;
         uint8_t                iocell_opts[sizeof(ahd->iocell_opts)];
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         saved_negoaddr = ahd_inb(ahd, NEGOADDR);
         ahd_outb(ahd, NEGOADDR, devinfo->target);
         period = tinfo->period;
         offset = tinfo->offset;
         memcpy(iocell_opts, ahd->iocell_opts, sizeof(ahd->iocell_opts)); 
         ppr_opts = tinfo->ppr_options & (MSG_EXT_PPR_QAS_REQ|MSG_EXT_PPR_DT_REQ
                                         |MSG_EXT_PPR_IU_REQ|MSG_EXT_PPR_RTI);
         con_opts = 0;
         if (period == 0)
                 period = AHD_SYNCRATE_ASYNC;
         if (period == AHD_SYNCRATE_160) {
 
                 if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0) {
                         /*
                          * When the SPI4 spec was finalized, PACE transfers
                          * was not made a configurable option in the PPR
                          * message.  Instead it is assumed to be enabled for
                          * any syncrate faster than 80MHz.  Nevertheless,
                          * Harpoon2A4 allows this to be configurable.
                          *
                          * Harpoon2A4 also assumes at most 2 data bytes per
                          * negotiated REQ/ACK offset.  Paced transfers take
                          * 4, so we must adjust our offset.
                          */
                         ppr_opts |= PPROPT_PACE;
                         offset *= 2;
 
                         /*
                          * Harpoon2A assumed that there would be a
                          * fallback rate between 160MHz and 80MHz,
                          * so 7 is used as the period factor rather
                          * than 8 for 160MHz.
                          */
                         period = AHD_SYNCRATE_REVA_160;
                 }
                 if ((tinfo->ppr_options & MSG_EXT_PPR_PCOMP_EN) == 0)
                         iocell_opts[AHD_PRECOMP_SLEW_INDEX] &=
                             ~AHD_PRECOMP_MASK;
         } else {
                 /*
                  * Precomp should be disabled for non-paced transfers.
                  */
                 iocell_opts[AHD_PRECOMP_SLEW_INDEX] &= ~AHD_PRECOMP_MASK;
 
                 if ((ahd->features & AHD_NEW_IOCELL_OPTS) != 0
                  && (ppr_opts & MSG_EXT_PPR_DT_REQ) != 0
                  && (ppr_opts & MSG_EXT_PPR_IU_REQ) == 0) {
                         /*
                          * Slow down our CRC interval to be
                          * compatible with non-packetized
                          * U160 devices that can't handle a
                          * CRC at full speed.
                          */
                         con_opts |= ENSLOWCRC;
                 }
 
                 if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0) {
                         /*
                          * On H2A4, revert to a slower slewrate
                          * on non-paced transfers.
                          */
                         iocell_opts[AHD_PRECOMP_SLEW_INDEX] &=
                             ~AHD_SLEWRATE_MASK;
                 }
         }
 
         ahd_outb(ahd, ANNEXCOL, AHD_ANNEXCOL_PRECOMP_SLEW);
         ahd_outb(ahd, ANNEXDAT, iocell_opts[AHD_PRECOMP_SLEW_INDEX]);
         ahd_outb(ahd, ANNEXCOL, AHD_ANNEXCOL_AMPLITUDE);
         ahd_outb(ahd, ANNEXDAT, iocell_opts[AHD_AMPLITUDE_INDEX]);
 
         ahd_outb(ahd, NEGPERIOD, period);
         ahd_outb(ahd, NEGPPROPTS, ppr_opts);
         ahd_outb(ahd, NEGOFFSET, offset);
 
         if (tinfo->width == MSG_EXT_WDTR_BUS_16_BIT)
                 con_opts |= WIDEXFER;
 
         /*
          * Slow down our CRC interval to be
          * compatible with packetized U320 devices
          * that can't handle a CRC at full speed
          */
         if (ahd->features & AHD_AIC79XXB_SLOWCRC) {
                 con_opts |= ENSLOWCRC;
         }
 
         /*
          * During packetized transfers, the target will
          * give us the oportunity to send command packets
          * without us asserting attention.
          */
         if ((tinfo->ppr_options & MSG_EXT_PPR_IU_REQ) == 0)
                 con_opts |= ENAUTOATNO;
         ahd_outb(ahd, NEGCONOPTS, con_opts);
         ahd_outb(ahd, NEGOADDR, saved_negoaddr);
         ahd_restore_modes(ahd, saved_modes);
 }
 
 /*
  * When the transfer settings for a connection change, setup for
  * negotiation in pending SCBs to effect the change as quickly as
  * possible.  We also cancel any negotiations that are scheduled
  * for inflight SCBs that have not been started yet.
  */
 static void
 ahd_update_pending_scbs(struct ahd_softc *ahd)
 {
         struct                scb *pending_scb;
         int                pending_scb_count;
         int                paused;
         u_int                saved_scbptr;
         ahd_mode_state        saved_modes;
 
         /*
          * Traverse the pending SCB list and ensure that all of the
          * SCBs there have the proper settings.  We can only safely
          * clear the negotiation required flag (setting requires the
          * execution queue to be modified) and this is only possible
          * if we are not already attempting to select out for this
          * SCB.  For this reason, all callers only call this routine
          * if we are changing the negotiation settings for the currently
          * active transaction on the bus.
          */
         pending_scb_count = 0;
         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
                 struct ahd_devinfo devinfo;
                 struct ahd_initiator_tinfo *tinfo;
                 struct ahd_tmode_tstate *tstate;
 
                 ahd_scb_devinfo(ahd, &devinfo, pending_scb);
                 tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
                                             devinfo.our_scsiid,
                                             devinfo.target, &tstate);
                 if ((tstate->auto_negotiate & devinfo.target_mask) == 0
                  && (pending_scb->flags & SCB_AUTO_NEGOTIATE) != 0) {
                         pending_scb->flags &= ~SCB_AUTO_NEGOTIATE;
                         pending_scb->hscb->control &= ~MK_MESSAGE;
                 }
                 ahd_sync_scb(ahd, pending_scb,
                              BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
                 pending_scb_count++;
         }
 
         if (pending_scb_count == 0)
                 return;
 
         if (ahd_is_paused(ahd)) {
                 paused = 1;
         } else {
                 paused = 0;
                 ahd_pause(ahd);
         }
 
         /*
          * Force the sequencer to reinitialize the selection for
          * the command at the head of the execution queue if it
          * has already been setup.  The negotiation changes may
          * effect whether we select-out with ATN.  It is only
          * safe to clear ENSELO when the bus is not free and no
          * selection is in progres or completed.
          */
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         if ((ahd_inb(ahd, SCSISIGI) & BSYI) != 0
          && (ahd_inb(ahd, SSTAT0) & (SELDO|SELINGO)) == 0)
                 ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
         saved_scbptr = ahd_get_scbptr(ahd);
         /* Ensure that the hscbs down on the card match the new information */
         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
                 u_int        scb_tag;
                 u_int        control;
 
                 scb_tag = SCB_GET_TAG(pending_scb);
                 ahd_set_scbptr(ahd, scb_tag);
                 control = ahd_inb_scbram(ahd, SCB_CONTROL);
                 control &= ~MK_MESSAGE;
                 control |= pending_scb->hscb->control & MK_MESSAGE;
                 ahd_outb(ahd, SCB_CONTROL, control);
         }
         ahd_set_scbptr(ahd, saved_scbptr);
         ahd_restore_modes(ahd, saved_modes);
 
         if (paused == 0)
                 ahd_unpause(ahd);
 }
 
 /**************************** Pathing Information *****************************/
 static void
 ahd_fetch_devinfo(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         ahd_mode_state        saved_modes;
         u_int                saved_scsiid;
         role_t                role;
         int                our_id;
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         if (ahd_inb(ahd, SSTAT0) & TARGET)
                 role = ROLE_TARGET;
         else
                 role = ROLE_INITIATOR;
 
         if (role == ROLE_TARGET
          && (ahd_inb(ahd, SEQ_FLAGS) & CMDPHASE_PENDING) != 0) {
                 /* We were selected, so pull our id from TARGIDIN */
                 our_id = ahd_inb(ahd, TARGIDIN) & OID;
         } else if (role == ROLE_TARGET)
                 our_id = ahd_inb(ahd, TOWNID);
         else
                 our_id = ahd_inb(ahd, IOWNID);
 
         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
         ahd_compile_devinfo(devinfo,
                             our_id,
                             SCSIID_TARGET(ahd, saved_scsiid),
                             ahd_inb(ahd, SAVED_LUN),
                             SCSIID_CHANNEL(ahd, saved_scsiid),
                             role);
         ahd_restore_modes(ahd, saved_modes);
 }
 
 void
 ahd_print_devinfo(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         printf("%s:%c:%d:%d: ", ahd_name(ahd), 'A',
                devinfo->target, devinfo->lun);
 }
 
 static const struct ahd_phase_table_entry*
 ahd_lookup_phase_entry(int phase)
 {
         const struct ahd_phase_table_entry *entry;
         const struct ahd_phase_table_entry *last_entry;
 
         /*
          * num_phases doesn't include the default entry which
          * will be returned if the phase doesn't match.
          */
         last_entry = &ahd_phase_table[num_phases];
         for (entry = ahd_phase_table; entry < last_entry; entry++) {
                 if (phase == entry->phase)
                         break;
         }
         return (entry);
 }
 
 void
 ahd_compile_devinfo(struct ahd_devinfo *devinfo, u_int our_id, u_int target,
                     u_int lun, char channel, role_t role)
 {
         devinfo->our_scsiid = our_id;
         devinfo->target = target;
         devinfo->lun = lun;
         devinfo->target_offset = target;
         devinfo->channel = channel;
         devinfo->role = role;
         if (channel == 'B')
                 devinfo->target_offset += 8;
         devinfo->target_mask = (0x01 << devinfo->target_offset);
 }
 
 static void
 ahd_scb_devinfo(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                 struct scb *scb)
 {
         role_t        role;
         int        our_id;
 
         our_id = SCSIID_OUR_ID(scb->hscb->scsiid);
         role = ROLE_INITIATOR;
         if ((scb->hscb->control & TARGET_SCB) != 0)
                 role = ROLE_TARGET;
         ahd_compile_devinfo(devinfo, our_id, SCB_GET_TARGET(ahd, scb),
                             SCB_GET_LUN(scb), SCB_GET_CHANNEL(ahd, scb), role);
 }
 
 
 /************************ Message Phase Processing ****************************/
 /*
  * When an initiator transaction with the MK_MESSAGE flag either reconnects
  * or enters the initial message out phase, we are interrupted.  Fill our
  * outgoing message buffer with the appropriate message and beging handing
  * the message phase(s) manually.
  */
 static void
 ahd_setup_initiator_msgout(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                            struct scb *scb)
 {
         /*
          * To facilitate adding multiple messages together,
          * each routine should increment the index and len
          * variables instead of setting them explicitly.
          */
         ahd->msgout_index = 0;
         ahd->msgout_len = 0;
 
         if (ahd_currently_packetized(ahd))
                 ahd->msg_flags |= MSG_FLAG_PACKETIZED;
 
         if (ahd->send_msg_perror
          && ahd_inb(ahd, MSG_OUT) == HOST_MSG) {
                 ahd->msgout_buf[ahd->msgout_index++] = ahd->send_msg_perror;
                 ahd->msgout_len++;
                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                         printf("Setting up for Parity Error delivery\n");
 #endif
                 return;
         } else if (scb == NULL) {
                 printf("%s: WARNING. No pending message for "
                        "I_T msgin.  Issuing NO-OP\n", ahd_name(ahd));
                 ahd->msgout_buf[ahd->msgout_index++] = MSG_NOOP;
                 ahd->msgout_len++;
                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
                 return;
         }
 
         if ((scb->flags & SCB_DEVICE_RESET) == 0
          && (scb->flags & SCB_PACKETIZED) == 0
          && ahd_inb(ahd, MSG_OUT) == MSG_IDENTIFYFLAG) {
                 u_int identify_msg;
 
                 identify_msg = MSG_IDENTIFYFLAG | SCB_GET_LUN(scb);
                 if ((scb->hscb->control & DISCENB) != 0)
                         identify_msg |= MSG_IDENTIFY_DISCFLAG;
                 ahd->msgout_buf[ahd->msgout_index++] = identify_msg;
                 ahd->msgout_len++;
 
                 if ((scb->hscb->control & TAG_ENB) != 0) {
                         ahd->msgout_buf[ahd->msgout_index++] =
                             scb->hscb->control & (TAG_ENB|SCB_TAG_TYPE);
                         ahd->msgout_buf[ahd->msgout_index++] = SCB_GET_TAG(scb);
                         ahd->msgout_len += 2;
                 }
         }
 
         if (scb->flags & SCB_DEVICE_RESET) {
                 ahd->msgout_buf[ahd->msgout_index++] = MSG_BUS_DEV_RESET;
                 ahd->msgout_len++;
                 ahd_print_path(ahd, scb);
                 printf("Bus Device Reset Message Sent\n");
                 /*
                  * Clear our selection hardware in advance of
                  * the busfree.  We may have an entry in the waiting
                  * Q for this target, and we don't want to go about
                  * selecting while we handle the busfree and blow it
                  * away.
                  */
                 ahd_outb(ahd, SCSISEQ0, 0);
         } else if ((scb->flags & SCB_ABORT) != 0) {
 
                 if ((scb->hscb->control & TAG_ENB) != 0) {
                         ahd->msgout_buf[ahd->msgout_index++] = MSG_ABORT_TAG;
                 } else {
                         ahd->msgout_buf[ahd->msgout_index++] = MSG_ABORT;
                 }
                 ahd->msgout_len++;
                 ahd_print_path(ahd, scb);
                 printf("Abort%s Message Sent\n",
                        (scb->hscb->control & TAG_ENB) != 0 ? " Tag" : "");
                 /*
                  * Clear our selection hardware in advance of
                  * the busfree.  We may have an entry in the waiting
                  * Q for this target, and we don't want to go about
                  * selecting while we handle the busfree and blow it
                  * away.
                  */
                 ahd_outb(ahd, SCSISEQ0, 0);
         } else if ((scb->flags & (SCB_AUTO_NEGOTIATE|SCB_NEGOTIATE)) != 0) {
                 ahd_build_transfer_msg(ahd, devinfo);
                 /*
                  * Clear our selection hardware in advance of potential
                  * PPR IU status change busfree.  We may have an entry in
                  * the waiting Q for this target, and we don't want to go
                  * about selecting while we handle the busfree and blow
                  * it away.
                  */
                 ahd_outb(ahd, SCSISEQ0, 0);
         } else {
                 printf("ahd_intr: AWAITING_MSG for an SCB that "
                        "does not have a waiting message\n");
                 printf("SCSIID = %x, target_mask = %x\n", scb->hscb->scsiid,
                        devinfo->target_mask);
                 panic("SCB = %d, SCB Control = %x:%x, MSG_OUT = %x "
                       "SCB flags = %x", SCB_GET_TAG(scb), scb->hscb->control,
                       ahd_inb_scbram(ahd, SCB_CONTROL), ahd_inb(ahd, MSG_OUT),
                       scb->flags);
         }
 
         /*
          * Clear the MK_MESSAGE flag from the SCB so we aren't
          * asked to send this message again.
          */
         ahd_outb(ahd, SCB_CONTROL,
                  ahd_inb_scbram(ahd, SCB_CONTROL) & ~MK_MESSAGE);
         scb->hscb->control &= ~MK_MESSAGE;
         ahd->msgout_index = 0;
         ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
 }
 
 /*
  * Build an appropriate transfer negotiation message for the
  * currently active target.
  */
 static void
 ahd_build_transfer_msg(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         /*
          * We need to initiate transfer negotiations.
          * If our current and goal settings are identical,
          * we want to renegotiate due to a check condition.
          */
         struct        ahd_initiator_tinfo *tinfo;
         struct        ahd_tmode_tstate *tstate;
         int        dowide;
         int        dosync;
         int        doppr;
         u_int        period;
         u_int        ppr_options;
         u_int        offset;
 
         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
                                     devinfo->target, &tstate);
         /*
          * Filter our period based on the current connection.
          * If we can't perform DT transfers on this segment (not in LVD
          * mode for instance), then our decision to issue a PPR message
          * may change.
          */
         period = tinfo->goal.period;
         offset = tinfo->goal.offset;
         ppr_options = tinfo->goal.ppr_options;
         /* Target initiated PPR is not allowed in the SCSI spec */
         if (devinfo->role == ROLE_TARGET)
                 ppr_options = 0;
         ahd_devlimited_syncrate(ahd, tinfo, &period,
                                 &ppr_options, devinfo->role);
         dowide = tinfo->curr.width != tinfo->goal.width;
         dosync = tinfo->curr.offset != offset || tinfo->curr.period != period;
         /*
          * Only use PPR if we have options that need it, even if the device
          * claims to support it.  There might be an expander in the way
          * that doesn't.
          */
         doppr = ppr_options != 0;
 
         if (!dowide && !dosync && !doppr) {
                 dowide = tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT;
                 dosync = tinfo->goal.offset != 0;
         }
 
         if (!dowide && !dosync && !doppr) {
                 /*
                  * Force async with a WDTR message if we have a wide bus,
                  * or just issue an SDTR with a 0 offset.
                  */
                 if ((ahd->features & AHD_WIDE) != 0)
                         dowide = 1;
                 else
                         dosync = 1;
 
                 if (bootverbose) {
                         ahd_print_devinfo(ahd, devinfo);
                         printf("Ensuring async\n");
                 }
         }
         /* Target initiated PPR is not allowed in the SCSI spec */
         if (devinfo->role == ROLE_TARGET)
                 doppr = 0;
 
         /*
          * Both the PPR message and SDTR message require the
          * goal syncrate to be limited to what the target device
          * is capable of handling (based on whether an LVD->SE
          * expander is on the bus), so combine these two cases.
          * Regardless, guarantee that if we are using WDTR and SDTR
          * messages that WDTR comes first.
          */
         if (doppr || (dosync && !dowide)) {
 
                 offset = tinfo->goal.offset;
                 ahd_validate_offset(ahd, tinfo, period, &offset,
                                     doppr ? tinfo->goal.width
                                           : tinfo->curr.width,
                                     devinfo->role);
                 if (doppr) {
                         ahd_construct_ppr(ahd, devinfo, period, offset,
                                           tinfo->goal.width, ppr_options);
                 } else {
                         ahd_construct_sdtr(ahd, devinfo, period, offset);
                 }
         } else {
                 ahd_construct_wdtr(ahd, devinfo, tinfo->goal.width);
         }
 }
 
 /*
  * Build a synchronous negotiation message in our message
  * buffer based on the input parameters.
  */
 static void
 ahd_construct_sdtr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                    u_int period, u_int offset)
 {
         if (offset == 0)
                 period = AHD_ASYNC_XFER_PERIOD;
         ahd->msgout_index += spi_populate_sync_msg(
                         ahd->msgout_buf + ahd->msgout_index, period, offset);
         ahd->msgout_len += 5;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending SDTR period %x, offset %x\n",
                        ahd_name(ahd), devinfo->channel, devinfo->target,
                        devinfo->lun, period, offset);
         }
 }
 
 /*
  * Build a wide negotiateion message in our message
  * buffer based on the input parameters.
  */
 static void
 ahd_construct_wdtr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                    u_int bus_width)
 {
         ahd->msgout_index += spi_populate_width_msg(
                         ahd->msgout_buf + ahd->msgout_index, bus_width);
         ahd->msgout_len += 4;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending WDTR %x\n",
                        ahd_name(ahd), devinfo->channel, devinfo->target,
                        devinfo->lun, bus_width);
         }
 }
 
 /*
  * Build a parallel protocol request message in our message
  * buffer based on the input parameters.
  */
 static void
 ahd_construct_ppr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                   u_int period, u_int offset, u_int bus_width,
                   u_int ppr_options)
 {
         /*
          * Always request precompensation from
          * the other target if we are running
          * at paced syncrates.
          */
         if (period <= AHD_SYNCRATE_PACED)
                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
         if (offset == 0)
                 period = AHD_ASYNC_XFER_PERIOD;
         ahd->msgout_index += spi_populate_ppr_msg(
                         ahd->msgout_buf + ahd->msgout_index, period, offset,
                         bus_width, ppr_options);
         ahd->msgout_len += 8;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending PPR bus_width %x, period %x, "
                        "offset %x, ppr_options %x\n", ahd_name(ahd),
                        devinfo->channel, devinfo->target, devinfo->lun,
                        bus_width, period, offset, ppr_options);
         }
 }
 
 /*
  * Clear any active message state.
  */
 static void
 ahd_clear_msg_state(struct ahd_softc *ahd)
 {
         ahd_mode_state saved_modes;
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         ahd->send_msg_perror = 0;
         ahd->msg_flags = MSG_FLAG_NONE;
         ahd->msgout_len = 0;
         ahd->msgin_index = 0;
         ahd->msg_type = MSG_TYPE_NONE;
         if ((ahd_inb(ahd, SCSISIGO) & ATNO) != 0) {
                 /*
                  * The target didn't care to respond to our
                  * message request, so clear ATN.
                  */
                 ahd_outb(ahd, CLRSINT1, CLRATNO);
         }
         ahd_outb(ahd, MSG_OUT, MSG_NOOP);
         ahd_outb(ahd, SEQ_FLAGS2,
                  ahd_inb(ahd, SEQ_FLAGS2) & ~TARGET_MSG_PENDING);
         ahd_restore_modes(ahd, saved_modes);
 }
 
 /*
  * Manual message loop handler.
  */
 static void
 ahd_handle_message_phase(struct ahd_softc *ahd)
 {
         struct        ahd_devinfo devinfo;
         u_int        bus_phase;
         int        end_session;
 
         ahd_fetch_devinfo(ahd, &devinfo);
         end_session = FALSE;
         bus_phase = ahd_inb(ahd, LASTPHASE);
 
         if ((ahd_inb(ahd, LQISTAT2) & LQIPHASE_OUTPKT) != 0) {
                 printf("LQIRETRY for LQIPHASE_OUTPKT\n");
                 ahd_outb(ahd, LQCTL2, LQIRETRY);
         }
 reswitch:
         switch (ahd->msg_type) {
         case MSG_TYPE_INITIATOR_MSGOUT:
         {
                 int lastbyte;
                 int phasemis;
                 int msgdone;
 
                 if (ahd->msgout_len == 0 && ahd->send_msg_perror == 0)
                         panic("HOST_MSG_LOOP interrupt with no active message");
 
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                         ahd_print_devinfo(ahd, &devinfo);
                         printf("INITIATOR_MSG_OUT");
                 }
 #endif
                 phasemis = bus_phase != P_MESGOUT;
                 if (phasemis) {
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                                 printf(" PHASEMIS %s\n",
                                        ahd_lookup_phase_entry(bus_phase)
                                                              ->phasemsg);
                         }
 #endif
                         if (bus_phase == P_MESGIN) {
                                 /*
                                  * Change gears and see if
                                  * this messages is of interest to
                                  * us or should be passed back to
                                  * the sequencer.
                                  */
                                 ahd_outb(ahd, CLRSINT1, CLRATNO);
                                 ahd->send_msg_perror = 0;
                                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGIN;
                                 ahd->msgin_index = 0;
                                 goto reswitch;
                         }
                         end_session = TRUE;
                         break;
                 }
 
                 if (ahd->send_msg_perror) {
                         ahd_outb(ahd, CLRSINT1, CLRATNO);
                         ahd_outb(ahd, CLRSINT1, CLRREQINIT);
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                                 printf(" byte 0x%x\n", ahd->send_msg_perror);
 #endif
                         /*
                          * If we are notifying the target of a CRC error
                          * during packetized operations, the target is
                          * within its rights to acknowledge our message
                          * with a busfree.
                          */
                         if ((ahd->msg_flags & MSG_FLAG_PACKETIZED) != 0
                          && ahd->send_msg_perror == MSG_INITIATOR_DET_ERR)
                                 ahd->msg_flags |= MSG_FLAG_EXPECT_IDE_BUSFREE;
 
                         ahd_outb(ahd, RETURN_2, ahd->send_msg_perror);
                         ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_WRITE);
                         break;
                 }
 
                 msgdone        = ahd->msgout_index == ahd->msgout_len;
                 if (msgdone) {
                         /*
                          * The target has requested a retry.
                          * Re-assert ATN, reset our message index to
                          * 0, and try again.
                          */
                         ahd->msgout_index = 0;
                         ahd_assert_atn(ahd);
                 }
 
                 lastbyte = ahd->msgout_index == (ahd->msgout_len - 1);
                 if (lastbyte) {
                         /* Last byte is signified by dropping ATN */
                         ahd_outb(ahd, CLRSINT1, CLRATNO);
                 }
 
                 /*
                  * Clear our interrupt status and present
                  * the next byte on the bus.
                  */
                 ahd_outb(ahd, CLRSINT1, CLRREQINIT);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                         printf(" byte 0x%x\n",
                                ahd->msgout_buf[ahd->msgout_index]);
 #endif
                 ahd_outb(ahd, RETURN_2, ahd->msgout_buf[ahd->msgout_index++]);
                 ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_WRITE);
                 break;
         }
         case MSG_TYPE_INITIATOR_MSGIN:
         {
                 int phasemis;
                 int message_done;
 
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                         ahd_print_devinfo(ahd, &devinfo);
                         printf("INITIATOR_MSG_IN");
                 }
 #endif
                 phasemis = bus_phase != P_MESGIN;
                 if (phasemis) {
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                                 printf(" PHASEMIS %s\n",
                                        ahd_lookup_phase_entry(bus_phase)
                                                              ->phasemsg);
                         }
 #endif
                         ahd->msgin_index = 0;
                         if (bus_phase == P_MESGOUT
                          && (ahd->send_msg_perror != 0
                           || (ahd->msgout_len != 0
                            && ahd->msgout_index == 0))) {
                                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
                                 goto reswitch;
                         }
                         end_session = TRUE;
                         break;
                 }
 
                 /* Pull the byte in without acking it */
                 ahd->msgin_buf[ahd->msgin_index] = ahd_inb(ahd, SCSIBUS);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                         printf(" byte 0x%x\n",
                                ahd->msgin_buf[ahd->msgin_index]);
 #endif
 
                 message_done = ahd_parse_msg(ahd, &devinfo);
 
                 if (message_done) {
                         /*
                          * Clear our incoming message buffer in case there
                          * is another message following this one.
                          */
                         ahd->msgin_index = 0;
 
                         /*
                          * If this message illicited a response,
                          * assert ATN so the target takes us to the
                          * message out phase.
                          */
                         if (ahd->msgout_len != 0) {
 #ifdef AHD_DEBUG
                                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
                                         ahd_print_devinfo(ahd, &devinfo);
                                         printf("Asserting ATN for response\n");
                                 }
 #endif
                                 ahd_assert_atn(ahd);
                         }
                 } else 
                         ahd->msgin_index++;
 
                 if (message_done == MSGLOOP_TERMINATED) {
                         end_session = TRUE;
                 } else {
                         /* Ack the byte */
                         ahd_outb(ahd, CLRSINT1, CLRREQINIT);
                         ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_READ);
                 }
                 break;
         }
         case MSG_TYPE_TARGET_MSGIN:
         {
                 int msgdone;
                 int msgout_request;
 
                 /*
                  * By default, the message loop will continue.
                  */
                 ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_TARG);
 
                 if (ahd->msgout_len == 0)
                         panic("Target MSGIN with no active message");
 
                 /*
                  * If we interrupted a mesgout session, the initiator
                  * will not know this until our first REQ.  So, we
                  * only honor mesgout requests after we've sent our
                  * first byte.
                  */
                 if ((ahd_inb(ahd, SCSISIGI) & ATNI) != 0
                  && ahd->msgout_index > 0)
                         msgout_request = TRUE;
                 else
                         msgout_request = FALSE;
 
                 if (msgout_request) {
 
                         /*
                          * Change gears and see if
                          * this messages is of interest to
                          * us or should be passed back to
                          * the sequencer.
                          */
                         ahd->msg_type = MSG_TYPE_TARGET_MSGOUT;
                         ahd_outb(ahd, SCSISIGO, P_MESGOUT | BSYO);
                         ahd->msgin_index = 0;
                         /* Dummy read to REQ for first byte */
                         ahd_inb(ahd, SCSIDAT);
                         ahd_outb(ahd, SXFRCTL0,
                                  ahd_inb(ahd, SXFRCTL0) | SPIOEN);
                         break;
                 }
 
                 msgdone = ahd->msgout_index == ahd->msgout_len;
                 if (msgdone) {
                         ahd_outb(ahd, SXFRCTL0,
                                  ahd_inb(ahd, SXFRCTL0) & ~SPIOEN);
                         end_session = TRUE;
                         break;
                 }
 
                 /*
                  * Present the next byte on the bus.
                  */
                 ahd_outb(ahd, SXFRCTL0, ahd_inb(ahd, SXFRCTL0) | SPIOEN);
                 ahd_outb(ahd, SCSIDAT, ahd->msgout_buf[ahd->msgout_index++]);
                 break;
         }
         case MSG_TYPE_TARGET_MSGOUT:
         {
                 int lastbyte;
                 int msgdone;
 
                 /*
                  * By default, the message loop will continue.
                  */
                 ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_TARG);
 
                 /*
                  * The initiator signals that this is
                  * the last byte by dropping ATN.
                  */
                 lastbyte = (ahd_inb(ahd, SCSISIGI) & ATNI) == 0;
 
                 /*
                  * Read the latched byte, but turn off SPIOEN first
                  * so that we don't inadvertently cause a REQ for the
                  * next byte.
                  */
                 ahd_outb(ahd, SXFRCTL0, ahd_inb(ahd, SXFRCTL0) & ~SPIOEN);
                 ahd->msgin_buf[ahd->msgin_index] = ahd_inb(ahd, SCSIDAT);
                 msgdone = ahd_parse_msg(ahd, &devinfo);
                 if (msgdone == MSGLOOP_TERMINATED) {
                         /*
                          * The message is *really* done in that it caused
                          * us to go to bus free.  The sequencer has already
                          * been reset at this point, so pull the ejection
                          * handle.
                          */
                         return;
                 }
                 
                 ahd->msgin_index++;
 
                 /*
                  * XXX Read spec about initiator dropping ATN too soon
                  *     and use msgdone to detect it.
                  */
                 if (msgdone == MSGLOOP_MSGCOMPLETE) {
                         ahd->msgin_index = 0;
 
                         /*
                          * If this message illicited a response, transition
                          * to the Message in phase and send it.
                          */
                         if (ahd->msgout_len != 0) {
                                 ahd_outb(ahd, SCSISIGO, P_MESGIN | BSYO);
                                 ahd_outb(ahd, SXFRCTL0,
                                          ahd_inb(ahd, SXFRCTL0) | SPIOEN);
                                 ahd->msg_type = MSG_TYPE_TARGET_MSGIN;
                                 ahd->msgin_index = 0;
                                 break;
                         }
                 }
 
                 if (lastbyte)
                         end_session = TRUE;
                 else {
                         /* Ask for the next byte. */
                         ahd_outb(ahd, SXFRCTL0,
                                  ahd_inb(ahd, SXFRCTL0) | SPIOEN);
                 }
 
                 break;
         }
         default:
                 panic("Unknown REQINIT message type");
         }
 
         if (end_session) {
                 if ((ahd->msg_flags & MSG_FLAG_PACKETIZED) != 0) {
                         printf("%s: Returning to Idle Loop\n",
                                ahd_name(ahd));
                         ahd_clear_msg_state(ahd);
 
                         /*
                          * Perform the equivalent of a clear_target_state.
                          */
                         ahd_outb(ahd, LASTPHASE, P_BUSFREE);
                         ahd_outb(ahd, SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT);
                         ahd_outb(ahd, SEQCTL0, FASTMODE|SEQRESET);
                 } else {
                         ahd_clear_msg_state(ahd);
                         ahd_outb(ahd, RETURN_1, EXIT_MSG_LOOP);
                 }
         }
 }
 
 /*
  * See if we sent a particular extended message to the target.
  * If "full" is true, return true only if the target saw the full
  * message.  If "full" is false, return true if the target saw at
  * least the first byte of the message.
  */
 static int
 ahd_sent_msg(struct ahd_softc *ahd, ahd_msgtype type, u_int msgval, int full)
 {
         int found;
         u_int index;
 
         found = FALSE;
         index = 0;
 
         while (index < ahd->msgout_len) {
                 if (ahd->msgout_buf[index] == MSG_EXTENDED) {
                         u_int end_index;
 
                         end_index = index + 1 + ahd->msgout_buf[index + 1];
                         if (ahd->msgout_buf[index+2] == msgval
                          && type == AHDMSG_EXT) {
 
                                 if (full) {
                                         if (ahd->msgout_index > end_index)
                                                 found = TRUE;
                                 } else if (ahd->msgout_index > index)
                                         found = TRUE;
                         }
                         index = end_index;
                 } else if (ahd->msgout_buf[index] >= MSG_SIMPLE_TASK
                         && ahd->msgout_buf[index] <= MSG_IGN_WIDE_RESIDUE) {
 
                         /* Skip tag type and tag id or residue param*/
                         index += 2;
                 } else {
                         /* Single byte message */
                         if (type == AHDMSG_1B
                          && ahd->msgout_index > index
                          && (ahd->msgout_buf[index] == msgval
                           || ((ahd->msgout_buf[index] & MSG_IDENTIFYFLAG) != 0
                            && msgval == MSG_IDENTIFYFLAG)))
                                 found = TRUE;
                         index++;
                 }
 
                 if (found)
                         break;
         }
         return (found);
 }
 
 /*
  * Wait for a complete incoming message, parse it, and respond accordingly.
  */
 static int
 ahd_parse_msg(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         struct        ahd_initiator_tinfo *tinfo;
         struct        ahd_tmode_tstate *tstate;
         int        reject;
         int        done;
         int        response;
 
         done = MSGLOOP_IN_PROG;
         response = FALSE;
         reject = FALSE;
         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
                                     devinfo->target, &tstate);
 
         /*
          * Parse as much of the message as is available,
          * rejecting it if we don't support it.  When
          * the entire message is available and has been
          * handled, return MSGLOOP_MSGCOMPLETE, indicating
          * that we have parsed an entire message.
          *
          * In the case of extended messages, we accept the length
          * byte outright and perform more checking once we know the
          * extended message type.
          */
         switch (ahd->msgin_buf[0]) {
         case MSG_DISCONNECT:
         case MSG_SAVEDATAPOINTER:
         case MSG_CMDCOMPLETE:
         case MSG_RESTOREPOINTERS:
         case MSG_IGN_WIDE_RESIDUE:
                 /*
                  * End our message loop as these are messages
                  * the sequencer handles on its own.
                  */
                 done = MSGLOOP_TERMINATED;
                 break;
         case MSG_MESSAGE_REJECT:
                 response = ahd_handle_msg_reject(ahd, devinfo);
                 /* FALLTHROUGH */
         case MSG_NOOP:
                 done = MSGLOOP_MSGCOMPLETE;
                 break;
         case MSG_EXTENDED:
         {
                 /* Wait for enough of the message to begin validation */
                 if (ahd->msgin_index < 2)
                         break;
                 switch (ahd->msgin_buf[2]) {
                 case MSG_EXT_SDTR:
                 {
                         u_int         period;
                         u_int         ppr_options;
                         u_int         offset;
                         u_int         saved_offset;
                         
                         if (ahd->msgin_buf[1] != MSG_EXT_SDTR_LEN) {
                                 reject = TRUE;
                                 break;
                         }
 
                         /*
                          * Wait until we have both args before validating
                          * and acting on this message.
                          *
                          * Add one to MSG_EXT_SDTR_LEN to account for
                          * the extended message preamble.
                          */
                         if (ahd->msgin_index < (MSG_EXT_SDTR_LEN + 1))
                                 break;
 
                         period = ahd->msgin_buf[3];
                         ppr_options = 0;
                         saved_offset = offset = ahd->msgin_buf[4];
                         ahd_devlimited_syncrate(ahd, tinfo, &period,
                                                 &ppr_options, devinfo->role);
                         ahd_validate_offset(ahd, tinfo, period, &offset,
                                             tinfo->curr.width, devinfo->role);
                         if (bootverbose) {
                                 printf("(%s:%c:%d:%d): Received "
                                        "SDTR period %x, offset %x\n\t"
                                        "Filtered to period %x, offset %x\n",
                                        ahd_name(ahd), devinfo->channel,
                                        devinfo->target, devinfo->lun,
                                        ahd->msgin_buf[3], saved_offset,
                                        period, offset);
                         }
                         ahd_set_syncrate(ahd, devinfo, period,
                                          offset, ppr_options,
                                          AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
                                          /*paused*/TRUE);
 
                         /*
                          * See if we initiated Sync Negotiation
                          * and didn't have to fall down to async
                          * transfers.
                          */
                         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, TRUE)) {
                                 /* We started it */
                                 if (saved_offset != offset) {
                                         /* Went too low - force async */
                                         reject = TRUE;
                                 }
                         } else {
                                 /*
                                  * Send our own SDTR in reply
                                  */
                                 if (bootverbose
                                  && devinfo->role == ROLE_INITIATOR) {
                                         printf("(%s:%c:%d:%d): Target "
                                                "Initiated SDTR\n",
                                                ahd_name(ahd), devinfo->channel,
                                                devinfo->target, devinfo->lun);
                                 }
                                 ahd->msgout_index = 0;
                                 ahd->msgout_len = 0;
                                 ahd_construct_sdtr(ahd, devinfo,
                                                    period, offset);
                                 ahd->msgout_index = 0;
                                 response = TRUE;
                         }
                         done = MSGLOOP_MSGCOMPLETE;
                         break;
                 }
                 case MSG_EXT_WDTR:
                 {
                         u_int bus_width;
                         u_int saved_width;
                         u_int sending_reply;
 
                         sending_reply = FALSE;
                         if (ahd->msgin_buf[1] != MSG_EXT_WDTR_LEN) {
                                 reject = TRUE;
                                 break;
                         }
 
                         /*
                          * Wait until we have our arg before validating
                          * and acting on this message.
                          *
                          * Add one to MSG_EXT_WDTR_LEN to account for
                          * the extended message preamble.
                          */
                         if (ahd->msgin_index < (MSG_EXT_WDTR_LEN + 1))
                                 break;
 
                         bus_width = ahd->msgin_buf[3];
                         saved_width = bus_width;
                         ahd_validate_width(ahd, tinfo, &bus_width,
                                            devinfo->role);
                         if (bootverbose) {
                                 printf("(%s:%c:%d:%d): Received WDTR "
                                        "%x filtered to %x\n",
                                        ahd_name(ahd), devinfo->channel,
                                        devinfo->target, devinfo->lun,
                                        saved_width, bus_width);
                         }
 
                         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, TRUE)) {
                                 /*
                                  * Don't send a WDTR back to the
                                  * target, since we asked first.
                                  * If the width went higher than our
                                  * request, reject it.
                                  */
                                 if (saved_width > bus_width) {
                                         reject = TRUE;
                                         printf("(%s:%c:%d:%d): requested %dBit "
                                                "transfers.  Rejecting...\n",
                                                ahd_name(ahd), devinfo->channel,
                                                devinfo->target, devinfo->lun,
                                                8 * (0x01 << bus_width));
                                         bus_width = 0;
                                 }
                         } else {
                                 /*
                                  * Send our own WDTR in reply
                                  */
                                 if (bootverbose
                                  && devinfo->role == ROLE_INITIATOR) {
                                         printf("(%s:%c:%d:%d): Target "
                                                "Initiated WDTR\n",
                                                ahd_name(ahd), devinfo->channel,
                                                devinfo->target, devinfo->lun);
                                 }
                                 ahd->msgout_index = 0;
                                 ahd->msgout_len = 0;
                                 ahd_construct_wdtr(ahd, devinfo, bus_width);
                                 ahd->msgout_index = 0;
                                 response = TRUE;
                                 sending_reply = TRUE;
                         }
                         /*
                          * After a wide message, we are async, but
                          * some devices don't seem to honor this portion
                          * of the spec.  Force a renegotiation of the
                          * sync component of our transfer agreement even
                          * if our goal is async.  By updating our width
                          * after forcing the negotiation, we avoid
                          * renegotiating for width.
                          */
                         ahd_update_neg_request(ahd, devinfo, tstate,
                                                tinfo, AHD_NEG_ALWAYS);
                         ahd_set_width(ahd, devinfo, bus_width,
                                       AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
                                       /*paused*/TRUE);
                         if (sending_reply == FALSE && reject == FALSE) {
 
                                 /*
                                  * We will always have an SDTR to send.
                                  */
                                 ahd->msgout_index = 0;
                                 ahd->msgout_len = 0;
                                 ahd_build_transfer_msg(ahd, devinfo);
                                 ahd->msgout_index = 0;
                                 response = TRUE;
                         }
                         done = MSGLOOP_MSGCOMPLETE;
                         break;
                 }
                 case MSG_EXT_PPR:
                 {
                         u_int        period;
                         u_int        offset;
                         u_int        bus_width;
                         u_int        ppr_options;
                         u_int        saved_width;
                         u_int        saved_offset;
                         u_int        saved_ppr_options;
 
                         if (ahd->msgin_buf[1] != MSG_EXT_PPR_LEN) {
                                 reject = TRUE;
                                 break;
                         }
 
                         /*
                          * Wait until we have all args before validating
                          * and acting on this message.
                          *
                          * Add one to MSG_EXT_PPR_LEN to account for
                          * the extended message preamble.
                          */
                         if (ahd->msgin_index < (MSG_EXT_PPR_LEN + 1))
                                 break;
 
                         period = ahd->msgin_buf[3];
                         offset = ahd->msgin_buf[5];
                         bus_width = ahd->msgin_buf[6];
                         saved_width = bus_width;
                         ppr_options = ahd->msgin_buf[7];
                         /*
                          * According to the spec, a DT only
                          * period factor with no DT option
                          * set implies async.
                          */
                         if ((ppr_options & MSG_EXT_PPR_DT_REQ) == 0
                          && period <= 9)
                                 offset = 0;
                         saved_ppr_options = ppr_options;
                         saved_offset = offset;
 
                         /*
                          * Transfer options are only available if we
                          * are negotiating wide.
                          */
                         if (bus_width == 0)
                                 ppr_options &= MSG_EXT_PPR_QAS_REQ;
 
                         ahd_validate_width(ahd, tinfo, &bus_width,
                                            devinfo->role);
                         ahd_devlimited_syncrate(ahd, tinfo, &period,
                                                 &ppr_options, devinfo->role);
                         ahd_validate_offset(ahd, tinfo, period, &offset,
                                             bus_width, devinfo->role);
 
                         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, TRUE)) {
                                 /*
                                  * If we are unable to do any of the
                                  * requested options (we went too low),
                                  * then we'll have to reject the message.
                                  */
                                 if (saved_width > bus_width
                                  || saved_offset != offset
                                  || saved_ppr_options != ppr_options) {
                                         reject = TRUE;
                                         period = 0;
                                         offset = 0;
                                         bus_width = 0;
                                         ppr_options = 0;
                                 }
                         } else {
                                 if (devinfo->role != ROLE_TARGET)
                                         printf("(%s:%c:%d:%d): Target "
                                                "Initiated PPR\n",
                                                ahd_name(ahd), devinfo->channel,
                                                devinfo->target, devinfo->lun);
                                 else
                                         printf("(%s:%c:%d:%d): Initiator "
                                                "Initiated PPR\n",
                                                ahd_name(ahd), devinfo->channel,
                                                devinfo->target, devinfo->lun);
                                 ahd->msgout_index = 0;
                                 ahd->msgout_len = 0;
                                 ahd_construct_ppr(ahd, devinfo, period, offset,
                                                   bus_width, ppr_options);
                                 ahd->msgout_index = 0;
                                 response = TRUE;
                         }
                         if (bootverbose) {
                                 printf("(%s:%c:%d:%d): Received PPR width %x, "
                                        "period %x, offset %x,options %x\n"
                                        "\tFiltered to width %x, period %x, "
                                        "offset %x, options %x\n",
                                        ahd_name(ahd), devinfo->channel,
                                        devinfo->target, devinfo->lun,
                                        saved_width, ahd->msgin_buf[3],
                                        saved_offset, saved_ppr_options,
                                        bus_width, period, offset, ppr_options);
                         }
                         ahd_set_width(ahd, devinfo, bus_width,
                                       AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
                                       /*paused*/TRUE);
                         ahd_set_syncrate(ahd, devinfo, period,
                                          offset, ppr_options,
                                          AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
                                          /*paused*/TRUE);
 
                         done = MSGLOOP_MSGCOMPLETE;
                         break;
                 }
                 default:
                         /* Unknown extended message.  Reject it. */
                         reject = TRUE;
                         break;
                 }
                 break;
         }
 #ifdef AHD_TARGET_MODE
         case MSG_BUS_DEV_RESET:
                 ahd_handle_devreset(ahd, devinfo, CAM_LUN_WILDCARD,
                                     CAM_BDR_SENT,
                                     "Bus Device Reset Received",
                                     /*verbose_level*/0);
                 ahd_restart(ahd);
                 done = MSGLOOP_TERMINATED;
                 break;
         case MSG_ABORT_TAG:
         case MSG_ABORT:
         case MSG_CLEAR_QUEUE:
         {
                 int tag;
 
                 /* Target mode messages */
                 if (devinfo->role != ROLE_TARGET) {
                         reject = TRUE;
                         break;
                 }
                 tag = SCB_LIST_NULL;
                 if (ahd->msgin_buf[0] == MSG_ABORT_TAG)
                         tag = ahd_inb(ahd, INITIATOR_TAG);
                 ahd_abort_scbs(ahd, devinfo->target, devinfo->channel,
                                devinfo->lun, tag, ROLE_TARGET,
                                CAM_REQ_ABORTED);
 
                 tstate = ahd->enabled_targets[devinfo->our_scsiid];
                 if (tstate != NULL) {
                         struct ahd_tmode_lstate* lstate;
 
                         lstate = tstate->enabled_luns[devinfo->lun];
                         if (lstate != NULL) {
                                 ahd_queue_lstate_event(ahd, lstate,
                                                        devinfo->our_scsiid,
                                                        ahd->msgin_buf[0],
                                                        /*arg*/tag);
                                 ahd_send_lstate_events(ahd, lstate);
                         }
                 }
                 ahd_restart(ahd);
                 done = MSGLOOP_TERMINATED;
                 break;
         }
 #endif
         case MSG_QAS_REQUEST:
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
                         printf("%s: QAS request.  SCSISIGI == 0x%x\n",
                                ahd_name(ahd), ahd_inb(ahd, SCSISIGI));
 #endif
                 ahd->msg_flags |= MSG_FLAG_EXPECT_QASREJ_BUSFREE;
                 /* FALLTHROUGH */
         case MSG_TERM_IO_PROC:
         default:
                 reject = TRUE;
                 break;
         }
 
         if (reject) {
                 /*
                  * Setup to reject the message.
                  */
                 ahd->msgout_index = 0;
                 ahd->msgout_len = 1;
                 ahd->msgout_buf[0] = MSG_MESSAGE_REJECT;
                 done = MSGLOOP_MSGCOMPLETE;
                 response = TRUE;
         }
 
         if (done != MSGLOOP_IN_PROG && !response)
                 /* Clear the outgoing message buffer */
                 ahd->msgout_len = 0;
 
         return (done);
 }
 
 /*
  * Process a message reject message.
  */
 static int
 ahd_handle_msg_reject(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         /*
          * What we care about here is if we had an
          * outstanding SDTR or WDTR message for this
          * target.  If we did, this is a signal that
          * the target is refusing negotiation.
          */
         struct scb *scb;
         struct ahd_initiator_tinfo *tinfo;
         struct ahd_tmode_tstate *tstate;
         u_int scb_index;
         u_int last_msg;
         int   response = 0;
 
         scb_index = ahd_get_scbptr(ahd);
         scb = ahd_lookup_scb(ahd, scb_index);
         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel,
                                     devinfo->our_scsiid,
                                     devinfo->target, &tstate);
         /* Might be necessary */
         last_msg = ahd_inb(ahd, LAST_MSG);
 
         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, /*full*/FALSE)) {
                 if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, /*full*/TRUE)
                  && tinfo->goal.period <= AHD_SYNCRATE_PACED) {
                         /*
                          * Target may not like our SPI-4 PPR Options.
                          * Attempt to negotiate 80MHz which will turn
                          * off these options.
                          */
                         if (bootverbose) {
                                 printf("(%s:%c:%d:%d): PPR Rejected. "
                                        "Trying simple U160 PPR\n",
                                        ahd_name(ahd), devinfo->channel,
                                        devinfo->target, devinfo->lun);
                         }
                         tinfo->goal.period = AHD_SYNCRATE_DT;
                         tinfo->goal.ppr_options &= MSG_EXT_PPR_IU_REQ
                                                 |  MSG_EXT_PPR_QAS_REQ
                                                 |  MSG_EXT_PPR_DT_REQ;
                 } else {
                         /*
                          * Target does not support the PPR message.
                          * Attempt to negotiate SPI-2 style.
                          */
                         if (bootverbose) {
                                 printf("(%s:%c:%d:%d): PPR Rejected. "
                                        "Trying WDTR/SDTR\n",
                                        ahd_name(ahd), devinfo->channel,
                                        devinfo->target, devinfo->lun);
                         }
                         tinfo->goal.ppr_options = 0;
                         tinfo->curr.transport_version = 2;
                         tinfo->goal.transport_version = 2;
                 }
                 ahd->msgout_index = 0;
                 ahd->msgout_len = 0;
                 ahd_build_transfer_msg(ahd, devinfo);
                 ahd->msgout_index = 0;
                 response = 1;
         } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, /*full*/FALSE)) {
 
                 /* note 8bit xfers */
                 printf("(%s:%c:%d:%d): refuses WIDE negotiation.  Using "
                        "8bit transfers\n", ahd_name(ahd),
                        devinfo->channel, devinfo->target, devinfo->lun);
                 ahd_set_width(ahd, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                               AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
                               /*paused*/TRUE);
                 /*
                  * No need to clear the sync rate.  If the target
                  * did not accept the command, our syncrate is
                  * unaffected.  If the target started the negotiation,
                  * but rejected our response, we already cleared the
                  * sync rate before sending our WDTR.
                  */
                 if (tinfo->goal.offset != tinfo->curr.offset) {
 
                         /* Start the sync negotiation */
                         ahd->msgout_index = 0;
                         ahd->msgout_len = 0;
                         ahd_build_transfer_msg(ahd, devinfo);
                         ahd->msgout_index = 0;
                         response = 1;
                 }
         } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, /*full*/FALSE)) {
                 /* note asynch xfers and clear flag */
                 ahd_set_syncrate(ahd, devinfo, /*period*/0,
                                  /*offset*/0, /*ppr_options*/0,
                                  AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
                                  /*paused*/TRUE);
                 printf("(%s:%c:%d:%d): refuses synchronous negotiation. "
                        "Using asynchronous transfers\n",
                        ahd_name(ahd), devinfo->channel,
                        devinfo->target, devinfo->lun);
         } else if ((scb->hscb->control & MSG_SIMPLE_TASK) != 0) {
                 int tag_type;
                 int mask;
 
                 tag_type = (scb->hscb->control & MSG_SIMPLE_TASK);
 
                 if (tag_type == MSG_SIMPLE_TASK) {
                         printf("(%s:%c:%d:%d): refuses tagged commands.  "
                                "Performing non-tagged I/O\n", ahd_name(ahd),
                                devinfo->channel, devinfo->target, devinfo->lun);
                         ahd_set_tags(ahd, scb->io_ctx, devinfo, AHD_QUEUE_NONE);
                         mask = ~0x23;
                 } else {
                         printf("(%s:%c:%d:%d): refuses %s tagged commands.  "
                                "Performing simple queue tagged I/O only\n",
                                ahd_name(ahd), devinfo->channel, devinfo->target,
                                devinfo->lun, tag_type == MSG_ORDERED_TASK
                                ? "ordered" : "head of queue");
                         ahd_set_tags(ahd, scb->io_ctx, devinfo, AHD_QUEUE_BASIC);
                         mask = ~0x03;
                 }
 
                 /*
                  * Resend the identify for this CCB as the target
                  * may believe that the selection is invalid otherwise.
                  */
                 ahd_outb(ahd, SCB_CONTROL,
                          ahd_inb_scbram(ahd, SCB_CONTROL) & mask);
                  scb->hscb->control &= mask;
                 ahd_set_transaction_tag(scb, /*enabled*/FALSE,
                                         /*type*/MSG_SIMPLE_TASK);
                 ahd_outb(ahd, MSG_OUT, MSG_IDENTIFYFLAG);
                 ahd_assert_atn(ahd);
                 ahd_busy_tcl(ahd, BUILD_TCL(scb->hscb->scsiid, devinfo->lun),
                              SCB_GET_TAG(scb));
 
                 /*
                  * Requeue all tagged commands for this target
                  * currently in our posession so they can be
                  * converted to untagged commands.
                  */
                 ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
                                    SCB_GET_CHANNEL(ahd, scb),
                                    SCB_GET_LUN(scb), /*tag*/SCB_LIST_NULL,
                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
                                    SEARCH_COMPLETE);
         } else if (ahd_sent_msg(ahd, AHDMSG_1B, MSG_IDENTIFYFLAG, TRUE)) {
                 /*
                  * Most likely the device believes that we had
                  * previously negotiated packetized.
                  */
                 ahd->msg_flags |= MSG_FLAG_EXPECT_PPR_BUSFREE
                                |  MSG_FLAG_IU_REQ_CHANGED;
 
                 ahd_force_renegotiation(ahd, devinfo);
                 ahd->msgout_index = 0;
                 ahd->msgout_len = 0;
                 ahd_build_transfer_msg(ahd, devinfo);
                 ahd->msgout_index = 0;
                 response = 1;
         } else {
                 /*
                  * Otherwise, we ignore it.
                  */
                 printf("%s:%c:%d: Message reject for %x -- ignored\n",
                        ahd_name(ahd), devinfo->channel, devinfo->target,
                        last_msg);
         }
         return (response);
 }
 
 /*
  * Process an ingnore wide residue message.
  */
 static void
 ahd_handle_ign_wide_residue(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 {
         u_int scb_index;
         struct scb *scb;
 
         scb_index = ahd_get_scbptr(ahd);
         scb = ahd_lookup_scb(ahd, scb_index);
         /*
          * XXX Actually check data direction in the sequencer?
          * Perhaps add datadir to some spare bits in the hscb?
          */
         if ((ahd_inb(ahd, SEQ_FLAGS) & DPHASE) == 0
          || ahd_get_transfer_dir(scb) != CAM_DIR_IN) {
                 /*
                  * Ignore the message if we haven't
                  * seen an appropriate data phase yet.
                  */
         } else {
                 /*
                  * If the residual occurred on the last
                  * transfer and the transfer request was
                  * expected to end on an odd count, do
                  * nothing.  Otherwise, subtract a byte
                  * and update the residual count accordingly.
                  */
                 uint32_t sgptr;
 
                 sgptr = ahd_inb_scbram(ahd, SCB_RESIDUAL_SGPTR);
                 if ((sgptr & SG_LIST_NULL) != 0
                  && (ahd_inb_scbram(ahd, SCB_TASK_ATTRIBUTE)
                      & SCB_XFERLEN_ODD) != 0) {
                         /*
                          * If the residual occurred on the last
                          * transfer and the transfer request was
                          * expected to end on an odd count, do
                          * nothing.
                          */
                 } else {
                         uint32_t data_cnt;
                         uint64_t data_addr;
                         uint32_t sglen;
 
                         /* Pull in the rest of the sgptr */
                         sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
                         data_cnt = ahd_inl_scbram(ahd, SCB_RESIDUAL_DATACNT);
                         if ((sgptr & SG_LIST_NULL) != 0) {
                                 /*
                                  * The residual data count is not updated
                                  * for the command run to completion case.
                                  * Explicitly zero the count.
                                  */
                                 data_cnt &= ~AHD_SG_LEN_MASK;
                         }
                         data_addr = ahd_inq(ahd, SHADDR);
                         data_cnt += 1;
                         data_addr -= 1;
                         sgptr &= SG_PTR_MASK;
                         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                                 struct ahd_dma64_seg *sg;
 
                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
 
                                 /*
                                  * The residual sg ptr points to the next S/G
                                  * to load so we must go back one.
                                  */
                                 sg--;
                                 sglen = ahd_le32toh(sg->len) & AHD_SG_LEN_MASK;
                                 if (sg != scb->sg_list
                                  && sglen < (data_cnt & AHD_SG_LEN_MASK)) {
 
                                         sg--;
                                         sglen = ahd_le32toh(sg->len);
                                         /*
                                          * Preserve High Address and SG_LIST
                                          * bits while setting the count to 1.
                                          */
                                         data_cnt = 1|(sglen&(~AHD_SG_LEN_MASK));
                                         data_addr = ahd_le64toh(sg->addr)
                                                   + (sglen & AHD_SG_LEN_MASK)
                                                   - 1;
 
                                         /*
                                          * Increment sg so it points to the
                                          * "next" sg.
                                          */
                                         sg++;
                                         sgptr = ahd_sg_virt_to_bus(ahd, scb,
                                                                    sg);
                                 }
                         } else {
                                 struct ahd_dma_seg *sg;
 
                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
 
                                 /*
                                  * The residual sg ptr points to the next S/G
                                  * to load so we must go back one.
                                  */
                                 sg--;
                                 sglen = ahd_le32toh(sg->len) & AHD_SG_LEN_MASK;
                                 if (sg != scb->sg_list
                                  && sglen < (data_cnt & AHD_SG_LEN_MASK)) {
 
                                         sg--;
                                         sglen = ahd_le32toh(sg->len);
                                         /*
                                          * Preserve High Address and SG_LIST
                                          * bits while setting the count to 1.
                                          */
                                         data_cnt = 1|(sglen&(~AHD_SG_LEN_MASK));
                                         data_addr = ahd_le32toh(sg->addr)
                                                   + (sglen & AHD_SG_LEN_MASK)
                                                   - 1;
 
                                         /*
                                          * Increment sg so it points to the
                                          * "next" sg.
                                          */
                                         sg++;
                                         sgptr = ahd_sg_virt_to_bus(ahd, scb,
                                                                   sg);
                                 }
                         }
                         /*
                          * Toggle the "oddness" of the transfer length
                          * to handle this mid-transfer ignore wide
                          * residue.  This ensures that the oddness is
                          * correct for subsequent data transfers.
                          */
                         ahd_outb(ahd, SCB_TASK_ATTRIBUTE,
                             ahd_inb_scbram(ahd, SCB_TASK_ATTRIBUTE)
                             ^ SCB_XFERLEN_ODD);
 
                         ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr);
                         ahd_outl(ahd, SCB_RESIDUAL_DATACNT, data_cnt);
                         /*
                          * The FIFO's pointers will be updated if/when the
                          * sequencer re-enters a data phase.
                          */
                 }
         }
 }
 
 
 /*
  * Reinitialize the data pointers for the active transfer
  * based on its current residual.
  */
 static void
 ahd_reinitialize_dataptrs(struct ahd_softc *ahd)
 {
         struct                 scb *scb;
         ahd_mode_state         saved_modes;
         u_int                 scb_index;
         u_int                 wait;
         uint32_t         sgptr;
         uint32_t         resid;
         uint64_t         dataptr;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_DFF0_MSK|AHD_MODE_DFF1_MSK,
                          AHD_MODE_DFF0_MSK|AHD_MODE_DFF1_MSK);
                          
         scb_index = ahd_get_scbptr(ahd);
         scb = ahd_lookup_scb(ahd, scb_index);
 
         /*
          * Release and reacquire the FIFO so we
          * have a clean slate.
          */
         ahd_outb(ahd, DFFSXFRCTL, CLRCHN);
         wait = 1000;
         while (--wait && !(ahd_inb(ahd, MDFFSTAT) & FIFOFREE))
                 ahd_delay(100);
         if (wait == 0) {
                 ahd_print_path(ahd, scb);
                 printf("ahd_reinitialize_dataptrs: Forcing FIFO free.\n");
                 ahd_outb(ahd, DFFSXFRCTL, RSTCHN|CLRSHCNT);
         }
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         ahd_outb(ahd, DFFSTAT,
                  ahd_inb(ahd, DFFSTAT)
                 | (saved_modes == 0x11 ? CURRFIFO_1 : CURRFIFO_0));
 
         /*
          * Determine initial values for data_addr and data_cnt
          * for resuming the data phase.
          */
         sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
         sgptr &= SG_PTR_MASK;
 
         resid = (ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT + 2) << 16)
               | (ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT + 1) << 8)
               | ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT);
 
         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                 struct ahd_dma64_seg *sg;
 
                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
 
                 /* The residual sg_ptr always points to the next sg */
                 sg--;
 
                 dataptr = ahd_le64toh(sg->addr)
                         + (ahd_le32toh(sg->len) & AHD_SG_LEN_MASK)
                         - resid;
                 ahd_outl(ahd, HADDR + 4, dataptr >> 32);
         } else {
                 struct         ahd_dma_seg *sg;
 
                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
 
                 /* The residual sg_ptr always points to the next sg */
                 sg--;
 
                 dataptr = ahd_le32toh(sg->addr)
                         + (ahd_le32toh(sg->len) & AHD_SG_LEN_MASK)
                         - resid;
                 ahd_outb(ahd, HADDR + 4,
                          (ahd_le32toh(sg->len) & ~AHD_SG_LEN_MASK) >> 24);
         }
         ahd_outl(ahd, HADDR, dataptr);
         ahd_outb(ahd, HCNT + 2, resid >> 16);
         ahd_outb(ahd, HCNT + 1, resid >> 8);
         ahd_outb(ahd, HCNT, resid);
 }
 
 /*
  * Handle the effects of issuing a bus device reset message.
  */
 static void
 ahd_handle_devreset(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                     u_int lun, cam_status status, char *message,
                     int verbose_level)
 {
 #ifdef AHD_TARGET_MODE
         struct ahd_tmode_tstate* tstate;
 #endif
         int found;
 
         found = ahd_abort_scbs(ahd, devinfo->target, devinfo->channel,
                                lun, SCB_LIST_NULL, devinfo->role,
                                status);
 
 #ifdef AHD_TARGET_MODE
         /*
          * Send an immediate notify ccb to all target mord peripheral
          * drivers affected by this action.
          */
         tstate = ahd->enabled_targets[devinfo->our_scsiid];
         if (tstate != NULL) {
                 u_int cur_lun;
                 u_int max_lun;
 
                 if (lun != CAM_LUN_WILDCARD) {
                         cur_lun = 0;
                         max_lun = AHD_NUM_LUNS - 1;
                 } else {
                         cur_lun = lun;
                         max_lun = lun;
                 }
                 for (;cur_lun <= max_lun; cur_lun++) {
                         struct ahd_tmode_lstate* lstate;
 
                         lstate = tstate->enabled_luns[cur_lun];
                         if (lstate == NULL)
                                 continue;
 
                         ahd_queue_lstate_event(ahd, lstate, devinfo->our_scsiid,
                                                MSG_BUS_DEV_RESET, /*arg*/0);
                         ahd_send_lstate_events(ahd, lstate);
                 }
         }
 #endif
 
         /*
          * Go back to async/narrow transfers and renegotiate.
          */
         ahd_set_width(ahd, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                       AHD_TRANS_CUR, /*paused*/TRUE);
         ahd_set_syncrate(ahd, devinfo, /*period*/0, /*offset*/0,
                          /*ppr_options*/0, AHD_TRANS_CUR,
                          /*paused*/TRUE);
         
         if (status != CAM_SEL_TIMEOUT)
                 ahd_send_async(ahd, devinfo->channel, devinfo->target,
                                CAM_LUN_WILDCARD, AC_SENT_BDR);
 
         if (message != NULL && bootverbose)
                 printf("%s: %s on %c:%d. %d SCBs aborted\n", ahd_name(ahd),
                        message, devinfo->channel, devinfo->target, found);
 }
 
 #ifdef AHD_TARGET_MODE
 static void
 ahd_setup_target_msgin(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                        struct scb *scb)
 {
 
         /*              
          * To facilitate adding multiple messages together,
          * each routine should increment the index and len
          * variables instead of setting them explicitly.
          */             
         ahd->msgout_index = 0;
         ahd->msgout_len = 0;
 
         if (scb != NULL && (scb->flags & SCB_AUTO_NEGOTIATE) != 0)
                 ahd_build_transfer_msg(ahd, devinfo);
         else
                 panic("ahd_intr: AWAITING target message with no message");
 
         ahd->msgout_index = 0;
         ahd->msg_type = MSG_TYPE_TARGET_MSGIN;
 }
 #endif
 /**************************** Initialization **********************************/
 static u_int
 ahd_sglist_size(struct ahd_softc *ahd)
 {
         bus_size_t list_size;
 
         list_size = sizeof(struct ahd_dma_seg) * AHD_NSEG;
         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
                 list_size = sizeof(struct ahd_dma64_seg) * AHD_NSEG;
         return (list_size);
 }
 
 /*
  * Calculate the optimum S/G List allocation size.  S/G elements used
  * for a given transaction must be physically contiguous.  Assume the
  * OS will allocate full pages to us, so it doesn't make sense to request
  * less than a page.
  */
 static u_int
 ahd_sglist_allocsize(struct ahd_softc *ahd)
 {
         bus_size_t sg_list_increment;
         bus_size_t sg_list_size;
         bus_size_t max_list_size;
         bus_size_t best_list_size;
 
         /* Start out with the minimum required for AHD_NSEG. */
         sg_list_increment = ahd_sglist_size(ahd);
         sg_list_size = sg_list_increment;
 
         /* Get us as close as possible to a page in size. */
         while ((sg_list_size + sg_list_increment) <= PAGE_SIZE)
                 sg_list_size += sg_list_increment;
 
         /*
          * Try to reduce the amount of wastage by allocating
          * multiple pages.
          */
         best_list_size = sg_list_size;
         max_list_size = roundup(sg_list_increment, PAGE_SIZE);
         if (max_list_size < 4 * PAGE_SIZE)
                 max_list_size = 4 * PAGE_SIZE;
         if (max_list_size > (AHD_SCB_MAX_ALLOC * sg_list_increment))
                 max_list_size = (AHD_SCB_MAX_ALLOC * sg_list_increment);
         while ((sg_list_size + sg_list_increment) <= max_list_size
            &&  (sg_list_size % PAGE_SIZE) != 0) {
                 bus_size_t new_mod;
                 bus_size_t best_mod;
 
                 sg_list_size += sg_list_increment;
                 new_mod = sg_list_size % PAGE_SIZE;
                 best_mod = best_list_size % PAGE_SIZE;
                 if (new_mod > best_mod || new_mod == 0) {
                         best_list_size = sg_list_size;
                 }
         }
         return (best_list_size);
 }
 
 /*
  * Allocate a controller structure for a new device
  * and perform initial initializion.
  */
 struct ahd_softc *
 ahd_alloc(void *platform_arg, char *name)
 {
         struct  ahd_softc *ahd;
 
 #ifndef        __FreeBSD__
         ahd = malloc(sizeof(*ahd), M_DEVBUF, M_NOWAIT);
         if (!ahd) {
                 printf("aic7xxx: cannot malloc softc!\n");
                 free(name, M_DEVBUF);
                 return NULL;
         }
 #else
         ahd = device_get_softc((device_t)platform_arg);
 #endif
         memset(ahd, 0, sizeof(*ahd));
         ahd->seep_config = malloc(sizeof(*ahd->seep_config),
                                   M_DEVBUF, M_NOWAIT);
         if (ahd->seep_config == NULL) {
 #ifndef        __FreeBSD__
                 free(ahd, M_DEVBUF);
 #endif
                 free(name, M_DEVBUF);
                 return (NULL);
         }
         LIST_INIT(&ahd->pending_scbs);
         /* We don't know our unit number until the OSM sets it */
         ahd->name = name;
         ahd->unit = -1;
         ahd->description = NULL;
         ahd->bus_description = NULL;
         ahd->channel = 'A';
         ahd->chip = AHD_NONE;
         ahd->features = AHD_FENONE;
         ahd->bugs = AHD_BUGNONE;
         ahd->flags = AHD_SPCHK_ENB_A|AHD_RESET_BUS_A|AHD_TERM_ENB_A
                    | AHD_EXTENDED_TRANS_A|AHD_STPWLEVEL_A;
         ahd_timer_init(&ahd->reset_timer);
         ahd_timer_init(&ahd->stat_timer);
         ahd->int_coalescing_timer = AHD_INT_COALESCING_TIMER_DEFAULT;
         ahd->int_coalescing_maxcmds = AHD_INT_COALESCING_MAXCMDS_DEFAULT;
         ahd->int_coalescing_mincmds = AHD_INT_COALESCING_MINCMDS_DEFAULT;
         ahd->int_coalescing_threshold = AHD_INT_COALESCING_THRESHOLD_DEFAULT;
         ahd->int_coalescing_stop_threshold =
             AHD_INT_COALESCING_STOP_THRESHOLD_DEFAULT;
 
         if (ahd_platform_alloc(ahd, platform_arg) != 0) {
                 ahd_free(ahd);
                 ahd = NULL;
         }
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MEMORY) != 0) {
                 printf("%s: scb size = 0x%x, hscb size = 0x%x\n",
                        ahd_name(ahd), (u_int)sizeof(struct scb),
                        (u_int)sizeof(struct hardware_scb));
         }
 #endif
         return (ahd);
 }
 
 int
 ahd_softc_init(struct ahd_softc *ahd)
 {
 
         ahd->unpause = 0;
         ahd->pause = PAUSE; 
         return (0);
 }
 
 void
 ahd_set_unit(struct ahd_softc *ahd, int unit)
 {
         ahd->unit = unit;
 }
 
 void
 ahd_set_name(struct ahd_softc *ahd, char *name)
 {
         if (ahd->name != NULL)
                 free(ahd->name, M_DEVBUF);
         ahd->name = name;
 }
 
 void
 ahd_free(struct ahd_softc *ahd)
 {
         int i;
 
         switch (ahd->init_level) {
         default:
         case 5:
                 ahd_shutdown(ahd);
                 /* FALLTHROUGH */
         case 4:
                 ahd_dmamap_unload(ahd, ahd->shared_data_dmat,
                                   ahd->shared_data_map.dmamap);
                 /* FALLTHROUGH */
         case 3:
                 ahd_dmamem_free(ahd, ahd->shared_data_dmat, ahd->qoutfifo,
                                 ahd->shared_data_map.dmamap);
                 ahd_dmamap_destroy(ahd, ahd->shared_data_dmat,
                                    ahd->shared_data_map.dmamap);
                 /* FALLTHROUGH */
         case 2:
                 ahd_dma_tag_destroy(ahd, ahd->shared_data_dmat);
         case 1:
 #ifndef __linux__
                 ahd_dma_tag_destroy(ahd, ahd->buffer_dmat);
 #endif
                 break;
         case 0:
                 break;
         }
 
 #ifndef __linux__
         ahd_dma_tag_destroy(ahd, ahd->parent_dmat);
 #endif
         ahd_platform_free(ahd);
         ahd_fini_scbdata(ahd);
         for (i = 0; i < AHD_NUM_TARGETS; i++) {
                 struct ahd_tmode_tstate *tstate;
 
                 tstate = ahd->enabled_targets[i];
                 if (tstate != NULL) {
 #ifdef AHD_TARGET_MODE
                         int j;
 
                         for (j = 0; j < AHD_NUM_LUNS; j++) {
                                 struct ahd_tmode_lstate *lstate;
 
                                 lstate = tstate->enabled_luns[j];
                                 if (lstate != NULL) {
                                         xpt_free_path(lstate->path);
                                         free(lstate, M_DEVBUF);
                                 }
                         }
 #endif
                         free(tstate, M_DEVBUF);
                 }
         }
 #ifdef AHD_TARGET_MODE
         if (ahd->black_hole != NULL) {
                 xpt_free_path(ahd->black_hole->path);
                 free(ahd->black_hole, M_DEVBUF);
         }
 #endif
         if (ahd->name != NULL)
                 free(ahd->name, M_DEVBUF);
         if (ahd->seep_config != NULL)
                 free(ahd->seep_config, M_DEVBUF);
         if (ahd->saved_stack != NULL)
                 free(ahd->saved_stack, M_DEVBUF);
 #ifndef __FreeBSD__
         free(ahd, M_DEVBUF);
 #endif
         return;
 }
 
 static void
 ahd_shutdown(void *arg)
 {
         struct        ahd_softc *ahd;
 
         ahd = (struct ahd_softc *)arg;
 
         /*
          * Stop periodic timer callbacks.
          */
         ahd_timer_stop(&ahd->reset_timer);
         ahd_timer_stop(&ahd->stat_timer);
 
         /* This will reset most registers to 0, but not all */
         ahd_reset(ahd, /*reinit*/FALSE);
 }
 
 /*
  * Reset the controller and record some information about it
  * that is only available just after a reset.  If "reinit" is
  * non-zero, this reset occured after initial configuration
  * and the caller requests that the chip be fully reinitialized
  * to a runable state.  Chip interrupts are *not* enabled after
  * a reinitialization.  The caller must enable interrupts via
  * ahd_intr_enable().
  */
 int
 ahd_reset(struct ahd_softc *ahd, int reinit)
 {
         u_int         sxfrctl1;
         int         wait;
         uint32_t cmd;
         
         /*
          * Preserve the value of the SXFRCTL1 register for all channels.
          * It contains settings that affect termination and we don't want
          * to disturb the integrity of the bus.
          */
         ahd_pause(ahd);
         ahd_update_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         sxfrctl1 = ahd_inb(ahd, SXFRCTL1);
 
         cmd = ahd_pci_read_config(ahd->dev_softc, PCIR_COMMAND, /*bytes*/2);
         if ((ahd->bugs & AHD_PCIX_CHIPRST_BUG) != 0) {
                 uint32_t mod_cmd;
 
                 /*
                  * A4 Razor #632
                  * During the assertion of CHIPRST, the chip
                  * does not disable its parity logic prior to
                  * the start of the reset.  This may cause a
                  * parity error to be detected and thus a
                  * spurious SERR or PERR assertion.  Disble
                  * PERR and SERR responses during the CHIPRST.
                  */
                 mod_cmd = cmd & ~(PCIM_CMD_PERRESPEN|PCIM_CMD_SERRESPEN);
                 ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
                                      mod_cmd, /*bytes*/2);
         }
         ahd_outb(ahd, HCNTRL, CHIPRST | ahd->pause);
 
         /*
          * Ensure that the reset has finished.  We delay 1000us
          * prior to reading the register to make sure the chip
          * has sufficiently completed its reset to handle register
          * accesses.
          */
         wait = 1000;
         do {
                 ahd_delay(1000);
         } while (--wait && !(ahd_inb(ahd, HCNTRL) & CHIPRSTACK));
 
         if (wait == 0) {
                 printf("%s: WARNING - Failed chip reset!  "
                        "Trying to initialize anyway.\n", ahd_name(ahd));
         }
         ahd_outb(ahd, HCNTRL, ahd->pause);
 
         if ((ahd->bugs & AHD_PCIX_CHIPRST_BUG) != 0) {
                 /*
                  * Clear any latched PCI error status and restore
                  * previous SERR and PERR response enables.
                  */
                 ahd_pci_write_config(ahd->dev_softc, PCIR_STATUS + 1,
                                      0xFF, /*bytes*/1);
                 ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
                                      cmd, /*bytes*/2);
         }
 
         /*
          * Mode should be SCSI after a chip reset, but lets
          * set it just to be safe.  We touch the MODE_PTR
          * register directly so as to bypass the lazy update
          * code in ahd_set_modes().
          */
         ahd_known_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         ahd_outb(ahd, MODE_PTR,
                  ahd_build_mode_state(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI));
 
         /*
          * Restore SXFRCTL1.
          *
          * We must always initialize STPWEN to 1 before we
          * restore the saved values.  STPWEN is initialized
          * to a tri-state condition which can only be cleared
          * by turning it on.
          */
         ahd_outb(ahd, SXFRCTL1, sxfrctl1|STPWEN);
         ahd_outb(ahd, SXFRCTL1, sxfrctl1);
 
         /* Determine chip configuration */
         ahd->features &= ~AHD_WIDE;
         if ((ahd_inb(ahd, SBLKCTL) & SELWIDE) != 0)
                 ahd->features |= AHD_WIDE;
 
         /*
          * If a recovery action has forced a chip reset,
          * re-initialize the chip to our liking.
          */
         if (reinit != 0)
                 ahd_chip_init(ahd);
 
         return (0);
 }
 
 /*
  * Determine the number of SCBs available on the controller
  */
 static int
 ahd_probe_scbs(struct ahd_softc *ahd) {
         int i;
 
         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
         for (i = 0; i < AHD_SCB_MAX; i++) {
                 int j;
 
                 ahd_set_scbptr(ahd, i);
                 ahd_outw(ahd, SCB_BASE, i);
                 for (j = 2; j < 64; j++)
                         ahd_outb(ahd, SCB_BASE+j, 0);
                 /* Start out life as unallocated (needing an abort) */
                 ahd_outb(ahd, SCB_CONTROL, MK_MESSAGE);
                 if (ahd_inw_scbram(ahd, SCB_BASE) != i)
                         break;
                 ahd_set_scbptr(ahd, 0);
                 if (ahd_inw_scbram(ahd, SCB_BASE) != 0)
                         break;
         }
         return (i);
 }
 
 static void
 ahd_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error) 
 {
         dma_addr_t *baddr;
 
         baddr = (dma_addr_t *)arg;
         *baddr = segs->ds_addr;
 }
 
 static void
 ahd_initialize_hscbs(struct ahd_softc *ahd)
 {
         int i;
 
         for (i = 0; i < ahd->scb_data.maxhscbs; i++) {
                 ahd_set_scbptr(ahd, i);
 
                 /* Clear the control byte. */
                 ahd_outb(ahd, SCB_CONTROL, 0);
 
                 /* Set the next pointer */
                 ahd_outw(ahd, SCB_NEXT, SCB_LIST_NULL);
         }
 }
 
 static int
 ahd_init_scbdata(struct ahd_softc *ahd)
 {
         struct        scb_data *scb_data;
         int        i;
 
         scb_data = &ahd->scb_data;
         TAILQ_INIT(&scb_data->free_scbs);
         for (i = 0; i < AHD_NUM_TARGETS * AHD_NUM_LUNS_NONPKT; i++)
                 LIST_INIT(&scb_data->free_scb_lists[i]);
         LIST_INIT(&scb_data->any_dev_free_scb_list);
         SLIST_INIT(&scb_data->hscb_maps);
         SLIST_INIT(&scb_data->sg_maps);
         SLIST_INIT(&scb_data->sense_maps);
 
         /* Determine the number of hardware SCBs and initialize them */
         scb_data->maxhscbs = ahd_probe_scbs(ahd);
         if (scb_data->maxhscbs == 0) {
                 printf("%s: No SCB space found\n", ahd_name(ahd));
                 return (ENXIO);
         }
 
         ahd_initialize_hscbs(ahd);
 
         /*
          * Create our DMA tags.  These tags define the kinds of device
          * accessible memory allocations and memory mappings we will
          * need to perform during normal operation.
          *
          * Unless we need to further restrict the allocation, we rely
          * on the restrictions of the parent dmat, hence the common
          * use of MAXADDR and MAXSIZE.
          */
 
         /* DMA tag for our hardware scb structures */
         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
                                /*highaddr*/BUS_SPACE_MAXADDR,
                                /*filter*/NULL, /*filterarg*/NULL,
                                PAGE_SIZE, /*nsegments*/1,
                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
                                /*flags*/0, &scb_data->hscb_dmat) != 0) {
                 goto error_exit;
         }
 
         scb_data->init_level++;
 
         /* DMA tag for our S/G structures. */
         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/8,
                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
                                /*highaddr*/BUS_SPACE_MAXADDR,
                                /*filter*/NULL, /*filterarg*/NULL,
                                ahd_sglist_allocsize(ahd), /*nsegments*/1,
                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
                                /*flags*/0, &scb_data->sg_dmat) != 0) {
                 goto error_exit;
         }
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MEMORY) != 0)
                 printf("%s: ahd_sglist_allocsize = 0x%x\n", ahd_name(ahd),
                        ahd_sglist_allocsize(ahd));
 #endif
 
         scb_data->init_level++;
 
         /* DMA tag for our sense buffers.  We allocate in page sized chunks */
         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
                                /*highaddr*/BUS_SPACE_MAXADDR,
                                /*filter*/NULL, /*filterarg*/NULL,
                                PAGE_SIZE, /*nsegments*/1,
                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
                                /*flags*/0, &scb_data->sense_dmat) != 0) {
                 goto error_exit;
         }
 
         scb_data->init_level++;
 
         /* Perform initial CCB allocation */
         ahd_alloc_scbs(ahd);
 
         if (scb_data->numscbs == 0) {
                 printf("%s: ahd_init_scbdata - "
                        "Unable to allocate initial scbs\n",
                        ahd_name(ahd));
                 goto error_exit;
         }
 
         /*
          * Note that we were successfull
          */
         return (0); 
 
 error_exit:
 
         return (ENOMEM);
 }
 
 static struct scb *
 ahd_find_scb_by_tag(struct ahd_softc *ahd, u_int tag)
 {
         struct scb *scb;
 
         /*
          * Look on the pending list.
          */
         LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
                 if (SCB_GET_TAG(scb) == tag)
                         return (scb);
         }
 
         /*
          * Then on all of the collision free lists.
          */
         TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
                 struct scb *list_scb;
 
                 list_scb = scb;
                 do {
                         if (SCB_GET_TAG(list_scb) == tag)
                                 return (list_scb);
                         list_scb = LIST_NEXT(list_scb, collision_links);
                 } while (list_scb);
         }
 
         /*
          * And finally on the generic free list.
          */
         LIST_FOREACH(scb, &ahd->scb_data.any_dev_free_scb_list, links.le) {
                 if (SCB_GET_TAG(scb) == tag)
                         return (scb);
         }
 
         return (NULL);
 }
 
 static void
 ahd_fini_scbdata(struct ahd_softc *ahd)
 {
         struct scb_data *scb_data;
 
         scb_data = &ahd->scb_data;
         if (scb_data == NULL)
                 return;
 
         switch (scb_data->init_level) {
         default:
         case 7:
         {
                 struct map_node *sns_map;
 
                 while ((sns_map = SLIST_FIRST(&scb_data->sense_maps)) != NULL) {
                         SLIST_REMOVE_HEAD(&scb_data->sense_maps, links);
                         ahd_dmamap_unload(ahd, scb_data->sense_dmat,
                                           sns_map->dmamap);
                         ahd_dmamem_free(ahd, scb_data->sense_dmat,
                                         sns_map->vaddr, sns_map->dmamap);
                         free(sns_map, M_DEVBUF);
                 }
                 ahd_dma_tag_destroy(ahd, scb_data->sense_dmat);
                 /* FALLTHROUGH */
         }
         case 6:
         {
                 struct map_node *sg_map;
 
                 while ((sg_map = SLIST_FIRST(&scb_data->sg_maps)) != NULL) {
                         SLIST_REMOVE_HEAD(&scb_data->sg_maps, links);
                         ahd_dmamap_unload(ahd, scb_data->sg_dmat,
                                           sg_map->dmamap);
                         ahd_dmamem_free(ahd, scb_data->sg_dmat,
                                         sg_map->vaddr, sg_map->dmamap);
                         free(sg_map, M_DEVBUF);
                 }
                 ahd_dma_tag_destroy(ahd, scb_data->sg_dmat);
                 /* FALLTHROUGH */
         }
         case 5:
         {
                 struct map_node *hscb_map;
 
                 while ((hscb_map = SLIST_FIRST(&scb_data->hscb_maps)) != NULL) {
                         SLIST_REMOVE_HEAD(&scb_data->hscb_maps, links);
                         ahd_dmamap_unload(ahd, scb_data->hscb_dmat,
                                           hscb_map->dmamap);
                         ahd_dmamem_free(ahd, scb_data->hscb_dmat,
                                         hscb_map->vaddr, hscb_map->dmamap);
                         free(hscb_map, M_DEVBUF);
                 }
                 ahd_dma_tag_destroy(ahd, scb_data->hscb_dmat);
                 /* FALLTHROUGH */
         }
         case 4:
         case 3:
         case 2:
         case 1:
         case 0:
                 break;
         }
 }
 
 /*
  * DSP filter Bypass must be enabled until the first selection
  * after a change in bus mode (Razor #491 and #493).
  */
 static void
 ahd_setup_iocell_workaround(struct ahd_softc *ahd)
 {
         ahd_mode_state saved_modes;
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
         ahd_outb(ahd, DSPDATACTL, ahd_inb(ahd, DSPDATACTL)
                | BYPASSENAB | RCVROFFSTDIS | XMITOFFSTDIS);
         ahd_outb(ahd, SIMODE0, ahd_inb(ahd, SIMODE0) | (ENSELDO|ENSELDI));
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MISC) != 0)
                 printf("%s: Setting up iocell workaround\n", ahd_name(ahd));
 #endif
         ahd_restore_modes(ahd, saved_modes);
         ahd->flags &= ~AHD_HAD_FIRST_SEL;
 }
 
 static void
 ahd_iocell_first_selection(struct ahd_softc *ahd)
 {
         ahd_mode_state        saved_modes;
         u_int                sblkctl;
 
         if ((ahd->flags & AHD_HAD_FIRST_SEL) != 0)
                 return;
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         sblkctl = ahd_inb(ahd, SBLKCTL);
         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MISC) != 0)
                 printf("%s: iocell first selection\n", ahd_name(ahd));
 #endif
         if ((sblkctl & ENAB40) != 0) {
                 ahd_outb(ahd, DSPDATACTL,
                          ahd_inb(ahd, DSPDATACTL) & ~BYPASSENAB);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
                         printf("%s: BYPASS now disabled\n", ahd_name(ahd));
 #endif
         }
         ahd_outb(ahd, SIMODE0, ahd_inb(ahd, SIMODE0) & ~(ENSELDO|ENSELDI));
         ahd_outb(ahd, CLRINT, CLRSCSIINT);
         ahd_restore_modes(ahd, saved_modes);
         ahd->flags |= AHD_HAD_FIRST_SEL;
 }
 
 /*************************** SCB Management ***********************************/
 static void
 ahd_add_col_list(struct ahd_softc *ahd, struct scb *scb, u_int col_idx)
 {
         struct        scb_list *free_list;
         struct        scb_tailq *free_tailq;
         struct        scb *first_scb;
 
         scb->flags |= SCB_ON_COL_LIST;
         AHD_SET_SCB_COL_IDX(scb, col_idx);
         free_list = &ahd->scb_data.free_scb_lists[col_idx];
         free_tailq = &ahd->scb_data.free_scbs;
         first_scb = LIST_FIRST(free_list);
         if (first_scb != NULL) {
                 LIST_INSERT_AFTER(first_scb, scb, collision_links);
         } else {
                 LIST_INSERT_HEAD(free_list, scb, collision_links);
                 TAILQ_INSERT_TAIL(free_tailq, scb, links.tqe);
         }
 }
 
 static void
 ahd_rem_col_list(struct ahd_softc *ahd, struct scb *scb)
 {
         struct        scb_list *free_list;
         struct        scb_tailq *free_tailq;
         struct        scb *first_scb;
         u_int        col_idx;
 
         scb->flags &= ~SCB_ON_COL_LIST;
         col_idx = AHD_GET_SCB_COL_IDX(ahd, scb);
         free_list = &ahd->scb_data.free_scb_lists[col_idx];
         free_tailq = &ahd->scb_data.free_scbs;
         first_scb = LIST_FIRST(free_list);
         if (first_scb == scb) {
                 struct scb *next_scb;
 
                 /*
                  * Maintain order in the collision free
                  * lists for fairness if this device has
                  * other colliding tags active.
                  */
                 next_scb = LIST_NEXT(scb, collision_links);
                 if (next_scb != NULL) {
                         TAILQ_INSERT_AFTER(free_tailq, scb,
                                            next_scb, links.tqe);
                 }
                 TAILQ_REMOVE(free_tailq, scb, links.tqe);
         }
         LIST_REMOVE(scb, collision_links);
 }
 
 /*
  * Get a free scb. If there are none, see if we can allocate a new SCB.
  */
 struct scb *
 ahd_get_scb(struct ahd_softc *ahd, u_int col_idx)
 {
         struct scb *scb;
         int tries;
 
         tries = 0;
 look_again:
         TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
                 if (AHD_GET_SCB_COL_IDX(ahd, scb) != col_idx) {
                         ahd_rem_col_list(ahd, scb);
                         goto found;
                 }
         }
         if ((scb = LIST_FIRST(&ahd->scb_data.any_dev_free_scb_list)) == NULL) {
 
                 if (tries++ != 0)
                         return (NULL);
                 ahd_alloc_scbs(ahd);
                 goto look_again;
         }
         LIST_REMOVE(scb, links.le);
         if (col_idx != AHD_NEVER_COL_IDX
          && (scb->col_scb != NULL)
          && (scb->col_scb->flags & SCB_ACTIVE) == 0) {
                 LIST_REMOVE(scb->col_scb, links.le);
                 ahd_add_col_list(ahd, scb->col_scb, col_idx);
         }
 found:
         scb->flags |= SCB_ACTIVE;
         return (scb);
 }
 
 /*
  * Return an SCB resource to the free list.
  */
 void
 ahd_free_scb(struct ahd_softc *ahd, struct scb *scb)
 {
         /* Clean up for the next user */
         scb->flags = SCB_FLAG_NONE;
         scb->hscb->control = 0;
         ahd->scb_data.scbindex[SCB_GET_TAG(scb)] = NULL;
 
         if (scb->col_scb == NULL) {
 
                 /*
                  * No collision possible.  Just free normally.
                  */
                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
                                  scb, links.le);
         } else if ((scb->col_scb->flags & SCB_ON_COL_LIST) != 0) {
 
                 /*
                  * The SCB we might have collided with is on
                  * a free collision list.  Put both SCBs on
                  * the generic list.
                  */
                 ahd_rem_col_list(ahd, scb->col_scb);
                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
                                  scb, links.le);
                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
                                  scb->col_scb, links.le);
         } else if ((scb->col_scb->flags
                   & (SCB_PACKETIZED|SCB_ACTIVE)) == SCB_ACTIVE
                 && (scb->col_scb->hscb->control & TAG_ENB) != 0) {
 
                 /*
                  * The SCB we might collide with on the next allocation
                  * is still active in a non-packetized, tagged, context.
                  * Put us on the SCB collision list.
                  */
                 ahd_add_col_list(ahd, scb,
                                  AHD_GET_SCB_COL_IDX(ahd, scb->col_scb));
         } else {
                 /*
                  * The SCB we might collide with on the next allocation
                  * is either active in a packetized context, or free.
                  * Since we can't collide, put this SCB on the generic
                  * free list.
                  */
                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
                                  scb, links.le);
         }
 
         ahd_platform_scb_free(ahd, scb);
 }
 
 static void
 ahd_alloc_scbs(struct ahd_softc *ahd)
 {
         struct scb_data *scb_data;
         struct scb        *next_scb;
         struct hardware_scb *hscb;
         struct map_node *hscb_map;
         struct map_node *sg_map;
         struct map_node *sense_map;
         uint8_t                *segs;
         uint8_t                *sense_data;
         dma_addr_t         hscb_busaddr;
         dma_addr_t         sg_busaddr;
         dma_addr_t         sense_busaddr;
         int                 newcount;
         int                 i;
 
         scb_data = &ahd->scb_data;
         if (scb_data->numscbs >= AHD_SCB_MAX_ALLOC)
                 /* Can't allocate any more */
                 return;
 
         if (scb_data->scbs_left != 0) {
                 int offset;
 
                 offset = (PAGE_SIZE / sizeof(*hscb)) - scb_data->scbs_left;
                 hscb_map = SLIST_FIRST(&scb_data->hscb_maps);
                 hscb = &((struct hardware_scb *)hscb_map->vaddr)[offset];
                 hscb_busaddr = hscb_map->physaddr + (offset * sizeof(*hscb));
         } else {
                 hscb_map = malloc(sizeof(*hscb_map), M_DEVBUF, M_NOWAIT);
 
                 if (hscb_map == NULL)
                         return;
 
                 /* Allocate the next batch of hardware SCBs */
                 if (ahd_dmamem_alloc(ahd, scb_data->hscb_dmat,
                                      (void **)&hscb_map->vaddr,
                                      BUS_DMA_NOWAIT, &hscb_map->dmamap) != 0) {
                         free(hscb_map, M_DEVBUF);
                         return;
                 }
 
                 SLIST_INSERT_HEAD(&scb_data->hscb_maps, hscb_map, links);
 
                 ahd_dmamap_load(ahd, scb_data->hscb_dmat, hscb_map->dmamap,
                                 hscb_map->vaddr, PAGE_SIZE, ahd_dmamap_cb,
                                 &hscb_map->physaddr, /*flags*/0);
 
                 hscb = (struct hardware_scb *)hscb_map->vaddr;
                 hscb_busaddr = hscb_map->physaddr;
                 scb_data->scbs_left = PAGE_SIZE / sizeof(*hscb);
         }
 
         if (scb_data->sgs_left != 0) {
                 int offset;
 
                 offset = ((ahd_sglist_allocsize(ahd) / ahd_sglist_size(ahd))
                        - scb_data->sgs_left) * ahd_sglist_size(ahd);
                 sg_map = SLIST_FIRST(&scb_data->sg_maps);
                 segs = sg_map->vaddr + offset;
                 sg_busaddr = sg_map->physaddr + offset;
         } else {
                 sg_map = malloc(sizeof(*sg_map), M_DEVBUF, M_NOWAIT);
 
                 if (sg_map == NULL)
                         return;
 
                 /* Allocate the next batch of S/G lists */
                 if (ahd_dmamem_alloc(ahd, scb_data->sg_dmat,
                                      (void **)&sg_map->vaddr,
                                      BUS_DMA_NOWAIT, &sg_map->dmamap) != 0) {
                         free(sg_map, M_DEVBUF);
                         return;
                 }
 
                 SLIST_INSERT_HEAD(&scb_data->sg_maps, sg_map, links);
 
                 ahd_dmamap_load(ahd, scb_data->sg_dmat, sg_map->dmamap,
                                 sg_map->vaddr, ahd_sglist_allocsize(ahd),
                                 ahd_dmamap_cb, &sg_map->physaddr, /*flags*/0);
 
                 segs = sg_map->vaddr;
                 sg_busaddr = sg_map->physaddr;
                 scb_data->sgs_left =
                     ahd_sglist_allocsize(ahd) / ahd_sglist_size(ahd);
 #ifdef AHD_DEBUG
                 if (ahd_debug & AHD_SHOW_MEMORY)
                         printf("Mapped SG data\n");
 #endif
         }
 
         if (scb_data->sense_left != 0) {
                 int offset;
 
                 offset = PAGE_SIZE - (AHD_SENSE_BUFSIZE * scb_data->sense_left);
                 sense_map = SLIST_FIRST(&scb_data->sense_maps);
                 sense_data = sense_map->vaddr + offset;
                 sense_busaddr = sense_map->physaddr + offset;
         } else {
                 sense_map = malloc(sizeof(*sense_map), M_DEVBUF, M_NOWAIT);
 
                 if (sense_map == NULL)
                         return;
 
                 /* Allocate the next batch of sense buffers */
                 if (ahd_dmamem_alloc(ahd, scb_data->sense_dmat,
                                      (void **)&sense_map->vaddr,
                                      BUS_DMA_NOWAIT, &sense_map->dmamap) != 0) {
                         free(sense_map, M_DEVBUF);
                         return;
                 }
 
                 SLIST_INSERT_HEAD(&scb_data->sense_maps, sense_map, links);
 
                 ahd_dmamap_load(ahd, scb_data->sense_dmat, sense_map->dmamap,
                                 sense_map->vaddr, PAGE_SIZE, ahd_dmamap_cb,
                                 &sense_map->physaddr, /*flags*/0);
 
                 sense_data = sense_map->vaddr;
                 sense_busaddr = sense_map->physaddr;
                 scb_data->sense_left = PAGE_SIZE / AHD_SENSE_BUFSIZE;
 #ifdef AHD_DEBUG
                 if (ahd_debug & AHD_SHOW_MEMORY)
                         printf("Mapped sense data\n");
 #endif
         }
 
         newcount = min(scb_data->sense_left, scb_data->scbs_left);
         newcount = min(newcount, scb_data->sgs_left);
         newcount = min(newcount, (AHD_SCB_MAX_ALLOC - scb_data->numscbs));
         for (i = 0; i < newcount; i++) {
                 struct scb_platform_data *pdata;
                 u_int col_tag;
 #ifndef __linux__
                 int error;
 #endif
 
                 next_scb = (struct scb *)malloc(sizeof(*next_scb),
                                                 M_DEVBUF, M_NOWAIT);
                 if (next_scb == NULL)
                         break;
 
                 pdata = (struct scb_platform_data *)malloc(sizeof(*pdata),
                                                            M_DEVBUF, M_NOWAIT);
                 if (pdata == NULL) {
                         free(next_scb, M_DEVBUF);
                         break;
                 }
                 next_scb->platform_data = pdata;
                 next_scb->hscb_map = hscb_map;
                 next_scb->sg_map = sg_map;
                 next_scb->sense_map = sense_map;
                 next_scb->sg_list = segs;
                 next_scb->sense_data = sense_data;
                 next_scb->sense_busaddr = sense_busaddr;
                 memset(hscb, 0, sizeof(*hscb));
                 next_scb->hscb = hscb;
                 hscb->hscb_busaddr = ahd_htole32(hscb_busaddr);
 
                 /*
                  * The sequencer always starts with the second entry.
                  * The first entry is embedded in the scb.
                  */
                 next_scb->sg_list_busaddr = sg_busaddr;
                 if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
                         next_scb->sg_list_busaddr
                             += sizeof(struct ahd_dma64_seg);
                 else
                         next_scb->sg_list_busaddr += sizeof(struct ahd_dma_seg);
                 next_scb->ahd_softc = ahd;
                 next_scb->flags = SCB_FLAG_NONE;
 #ifndef __linux__
                 error = ahd_dmamap_create(ahd, ahd->buffer_dmat, /*flags*/0,
                                           &next_scb->dmamap);
                 if (error != 0) {
                         free(next_scb, M_DEVBUF);
                         free(pdata, M_DEVBUF);
                         break;
                 }
 #endif
                 next_scb->hscb->tag = ahd_htole16(scb_data->numscbs);
                 col_tag = scb_data->numscbs ^ 0x100;
                 next_scb->col_scb = ahd_find_scb_by_tag(ahd, col_tag);
                 if (next_scb->col_scb != NULL)
                         next_scb->col_scb->col_scb = next_scb;
                 ahd_free_scb(ahd, next_scb);
                 hscb++;
                 hscb_busaddr += sizeof(*hscb);
                 segs += ahd_sglist_size(ahd);
                 sg_busaddr += ahd_sglist_size(ahd);
                 sense_data += AHD_SENSE_BUFSIZE;
                 sense_busaddr += AHD_SENSE_BUFSIZE;
                 scb_data->numscbs++;
                 scb_data->sense_left--;
                 scb_data->scbs_left--;
                 scb_data->sgs_left--;
         }
 }
 
 void
 ahd_controller_info(struct ahd_softc *ahd, char *buf)
 {
         const char *speed;
         const char *type;
         int len;
 
         len = sprintf(buf, "%s: ", ahd_chip_names[ahd->chip & AHD_CHIPID_MASK]);
         buf += len;
 
         speed = "Ultra320 ";
         if ((ahd->features & AHD_WIDE) != 0) {
                 type = "Wide ";
         } else {
                 type = "Single ";
         }
         len = sprintf(buf, "%s%sChannel %c, SCSI Id=%d, ",
                       speed, type, ahd->channel, ahd->our_id);
         buf += len;
 
         sprintf(buf, "%s, %d SCBs", ahd->bus_description,
                 ahd->scb_data.maxhscbs);
 }
 
 static const char *channel_strings[] = {
         "Primary Low",
         "Primary High",
         "Secondary Low", 
         "Secondary High"
 };
 
 static const char *termstat_strings[] = {
         "Terminated Correctly",
         "Over Terminated",
         "Under Terminated",
         "Not Configured"
 };
 
 /***************************** Timer Facilities *******************************/
 #define ahd_timer_init init_timer
 #define ahd_timer_stop del_timer_sync
 typedef void ahd_linux_callback_t (u_long);
 
 static void
 ahd_timer_reset(ahd_timer_t *timer, int usec, ahd_callback_t *func, void *arg)
 {
         struct ahd_softc *ahd;
 
         ahd = (struct ahd_softc *)arg;
         del_timer(timer);
         timer->data = (u_long)arg;
         timer->expires = jiffies + (usec * HZ)/1000000;
         timer->function = (ahd_linux_callback_t*)func;
         add_timer(timer);
 }
 
 /*
  * Start the board, ready for normal operation
  */
 int
 ahd_init(struct ahd_softc *ahd)
 {
         uint8_t                *next_vaddr;
         dma_addr_t         next_baddr;
         size_t                 driver_data_size;
         int                 i;
         int                 error;
         u_int                 warn_user;
         uint8_t                 current_sensing;
         uint8_t                 fstat;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
 
         ahd->stack_size = ahd_probe_stack_size(ahd);
         ahd->saved_stack = malloc(ahd->stack_size * sizeof(uint16_t),
                                   M_DEVBUF, M_NOWAIT);
         if (ahd->saved_stack == NULL)
                 return (ENOMEM);
 
         /*
          * Verify that the compiler hasn't over-agressively
          * padded important structures.
          */
         if (sizeof(struct hardware_scb) != 64)
                 panic("Hardware SCB size is incorrect");
 
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_DEBUG_SEQUENCER) != 0)
                 ahd->flags |= AHD_SEQUENCER_DEBUG;
 #endif
 
         /*
          * Default to allowing initiator operations.
          */
         ahd->flags |= AHD_INITIATORROLE;
 
         /*
          * Only allow target mode features if this unit has them enabled.
          */
         if ((AHD_TMODE_ENABLE & (0x1 << ahd->unit)) == 0)
                 ahd->features &= ~AHD_TARGETMODE;
 
 #ifndef __linux__
         /* DMA tag for mapping buffers into device visible space. */
         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
                                /*lowaddr*/ahd->flags & AHD_39BIT_ADDRESSING
                                         ? (dma_addr_t)0x7FFFFFFFFFULL
                                         : BUS_SPACE_MAXADDR_32BIT,
                                /*highaddr*/BUS_SPACE_MAXADDR,
                                /*filter*/NULL, /*filterarg*/NULL,
                                /*maxsize*/(AHD_NSEG - 1) * PAGE_SIZE,
                                /*nsegments*/AHD_NSEG,
                                /*maxsegsz*/AHD_MAXTRANSFER_SIZE,
                                /*flags*/BUS_DMA_ALLOCNOW,
                                &ahd->buffer_dmat) != 0) {
                 return (ENOMEM);
         }
 #endif
 
         ahd->init_level++;
 
         /*
          * DMA tag for our command fifos and other data in system memory
          * the card's sequencer must be able to access.  For initiator
          * roles, we need to allocate space for the qoutfifo.  When providing
          * for the target mode role, we must additionally provide space for
          * the incoming target command fifo.
          */
         driver_data_size = AHD_SCB_MAX * sizeof(*ahd->qoutfifo)
                          + sizeof(struct hardware_scb);
         if ((ahd->features & AHD_TARGETMODE) != 0)
                 driver_data_size += AHD_TMODE_CMDS * sizeof(struct target_cmd);
         if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) != 0)
                 driver_data_size += PKT_OVERRUN_BUFSIZE;
         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
                                /*highaddr*/BUS_SPACE_MAXADDR,
                                /*filter*/NULL, /*filterarg*/NULL,
                                driver_data_size,
                                /*nsegments*/1,
                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
                                /*flags*/0, &ahd->shared_data_dmat) != 0) {
                 return (ENOMEM);
         }
 
         ahd->init_level++;
 
         /* Allocation of driver data */
         if (ahd_dmamem_alloc(ahd, ahd->shared_data_dmat,
                              (void **)&ahd->shared_data_map.vaddr,
                              BUS_DMA_NOWAIT,
                              &ahd->shared_data_map.dmamap) != 0) {
                 return (ENOMEM);
         }
 
         ahd->init_level++;
 
         /* And permanently map it in */
         ahd_dmamap_load(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
                         ahd->shared_data_map.vaddr, driver_data_size,
                         ahd_dmamap_cb, &ahd->shared_data_map.physaddr,
                         /*flags*/0);
         ahd->qoutfifo = (struct ahd_completion *)ahd->shared_data_map.vaddr;
         next_vaddr = (uint8_t *)&ahd->qoutfifo[AHD_QOUT_SIZE];
         next_baddr = ahd->shared_data_map.physaddr
                    + AHD_QOUT_SIZE*sizeof(struct ahd_completion);
         if ((ahd->features & AHD_TARGETMODE) != 0) {
                 ahd->targetcmds = (struct target_cmd *)next_vaddr;
                 next_vaddr += AHD_TMODE_CMDS * sizeof(struct target_cmd);
                 next_baddr += AHD_TMODE_CMDS * sizeof(struct target_cmd);
         }
 
         if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) != 0) {
                 ahd->overrun_buf = next_vaddr;
                 next_vaddr += PKT_OVERRUN_BUFSIZE;
                 next_baddr += PKT_OVERRUN_BUFSIZE;
         }
 
         /*
          * We need one SCB to serve as the "next SCB".  Since the
          * tag identifier in this SCB will never be used, there is
          * no point in using a valid HSCB tag from an SCB pulled from
          * the standard free pool.  So, we allocate this "sentinel"
          * specially from the DMA safe memory chunk used for the QOUTFIFO.
          */
         ahd->next_queued_hscb = (struct hardware_scb *)next_vaddr;
         ahd->next_queued_hscb_map = &ahd->shared_data_map;
         ahd->next_queued_hscb->hscb_busaddr = ahd_htole32(next_baddr);
 
         ahd->init_level++;
 
         /* Allocate SCB data now that buffer_dmat is initialized */
         if (ahd_init_scbdata(ahd) != 0)
                 return (ENOMEM);
 
         if ((ahd->flags & AHD_INITIATORROLE) == 0)
                 ahd->flags &= ~AHD_RESET_BUS_A;
 
         /*
          * Before committing these settings to the chip, give
          * the OSM one last chance to modify our configuration.
          */
         ahd_platform_init(ahd);
 
         /* Bring up the chip. */
         ahd_chip_init(ahd);
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
 
         if ((ahd->flags & AHD_CURRENT_SENSING) == 0)
                 goto init_done;
 
         /*
          * Verify termination based on current draw and
          * warn user if the bus is over/under terminated.
          */
         error = ahd_write_flexport(ahd, FLXADDR_ROMSTAT_CURSENSECTL,
                                    CURSENSE_ENB);
         if (error != 0) {
                 printf("%s: current sensing timeout 1\n", ahd_name(ahd));
                 goto init_done;
         }
         for (i = 20, fstat = FLX_FSTAT_BUSY;
              (fstat & FLX_FSTAT_BUSY) != 0 && i; i--) {
                 error = ahd_read_flexport(ahd, FLXADDR_FLEXSTAT, &fstat);
                 if (error != 0) {
                         printf("%s: current sensing timeout 2\n",
                                ahd_name(ahd));
                         goto init_done;
                 }
         }
         if (i == 0) {
                 printf("%s: Timedout during current-sensing test\n",
                        ahd_name(ahd));
                 goto init_done;
         }
 
         /* Latch Current Sensing status. */
         error = ahd_read_flexport(ahd, FLXADDR_CURRENT_STAT, &current_sensing);
         if (error != 0) {
                 printf("%s: current sensing timeout 3\n", ahd_name(ahd));
                 goto init_done;
         }
 
         /* Diable current sensing. */
         ahd_write_flexport(ahd, FLXADDR_ROMSTAT_CURSENSECTL, 0);
 
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_TERMCTL) != 0) {
                 printf("%s: current_sensing == 0x%x\n",
                        ahd_name(ahd), current_sensing);
         }
 #endif
         warn_user = 0;
         for (i = 0; i < 4; i++, current_sensing >>= FLX_CSTAT_SHIFT) {
                 u_int term_stat;
 
                 term_stat = (current_sensing & FLX_CSTAT_MASK);
                 switch (term_stat) {
                 case FLX_CSTAT_OVER:
                 case FLX_CSTAT_UNDER:
                         warn_user++;
                 case FLX_CSTAT_INVALID:
                 case FLX_CSTAT_OKAY:
                         if (warn_user == 0 && bootverbose == 0)
                                 break;
                         printf("%s: %s Channel %s\n", ahd_name(ahd),
                                channel_strings[i], termstat_strings[term_stat]);
                         break;
                 }
         }
         if (warn_user) {
                 printf("%s: WARNING. Termination is not configured correctly.\n"
                        "%s: WARNING. SCSI bus operations may FAIL.\n",
                        ahd_name(ahd), ahd_name(ahd));
         }
 init_done:
         ahd_restart(ahd);
         ahd_timer_reset(&ahd->stat_timer, AHD_STAT_UPDATE_US,
                         ahd_stat_timer, ahd);
         return (0);
 }
 
 /*
  * (Re)initialize chip state after a chip reset.
  */
 static void
 ahd_chip_init(struct ahd_softc *ahd)
 {
         uint32_t busaddr;
         u_int         sxfrctl1;
         u_int         scsiseq_template;
         u_int         wait;
         u_int         i;
         u_int         target;
 
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         /*
          * Take the LED out of diagnostic mode
          */
         ahd_outb(ahd, SBLKCTL, ahd_inb(ahd, SBLKCTL) & ~(DIAGLEDEN|DIAGLEDON));
 
         /*
          * Return HS_MAILBOX to its default value.
          */
         ahd->hs_mailbox = 0;
         ahd_outb(ahd, HS_MAILBOX, 0);
 
         /* Set the SCSI Id, SXFRCTL0, SXFRCTL1, and SIMODE1. */
         ahd_outb(ahd, IOWNID, ahd->our_id);
         ahd_outb(ahd, TOWNID, ahd->our_id);
         sxfrctl1 = (ahd->flags & AHD_TERM_ENB_A) != 0 ? STPWEN : 0;
         sxfrctl1 |= (ahd->flags & AHD_SPCHK_ENB_A) != 0 ? ENSPCHK : 0;
         if ((ahd->bugs & AHD_LONG_SETIMO_BUG)
          && (ahd->seltime != STIMESEL_MIN)) {
                 /*
                  * The selection timer duration is twice as long
                  * as it should be.  Halve it by adding "1" to
                  * the user specified setting.
                  */
                 sxfrctl1 |= ahd->seltime + STIMESEL_BUG_ADJ;
         } else {
                 sxfrctl1 |= ahd->seltime;
         }
                 
         ahd_outb(ahd, SXFRCTL0, DFON);
         ahd_outb(ahd, SXFRCTL1, sxfrctl1|ahd->seltime|ENSTIMER|ACTNEGEN);
         ahd_outb(ahd, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
 
         /*
          * Now that termination is set, wait for up
          * to 500ms for our transceivers to settle.  If
          * the adapter does not have a cable attached,
          * the transceivers may never settle, so don't
          * complain if we fail here.
          */
         for (wait = 10000;
              (ahd_inb(ahd, SBLKCTL) & (ENAB40|ENAB20)) == 0 && wait;
              wait--)
                 ahd_delay(100);
 
         /* Clear any false bus resets due to the transceivers settling */
         ahd_outb(ahd, CLRSINT1, CLRSCSIRSTI);
         ahd_outb(ahd, CLRINT, CLRSCSIINT);
 
         /* Initialize mode specific S/G state. */
         for (i = 0; i < 2; i++) {
                 ahd_set_modes(ahd, AHD_MODE_DFF0 + i, AHD_MODE_DFF0 + i);
                 ahd_outb(ahd, LONGJMP_ADDR + 1, INVALID_ADDR);
                 ahd_outb(ahd, SG_STATE, 0);
                 ahd_outb(ahd, CLRSEQINTSRC, 0xFF);
                 ahd_outb(ahd, SEQIMODE,
                          ENSAVEPTRS|ENCFG4DATA|ENCFG4ISTAT
                         |ENCFG4TSTAT|ENCFG4ICMD|ENCFG4TCMD);
         }
 
         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
         ahd_outb(ahd, DSCOMMAND0, ahd_inb(ahd, DSCOMMAND0)|MPARCKEN|CACHETHEN);
         ahd_outb(ahd, DFF_THRSH, RD_DFTHRSH_75|WR_DFTHRSH_75);
         ahd_outb(ahd, SIMODE0, ENIOERR|ENOVERRUN);
         ahd_outb(ahd, SIMODE3, ENNTRAMPERR|ENOSRAMPERR);
         if ((ahd->bugs & AHD_BUSFREEREV_BUG) != 0) {
                 ahd_outb(ahd, OPTIONMODE, AUTOACKEN|AUTO_MSGOUT_DE);
         } else {
                 ahd_outb(ahd, OPTIONMODE, AUTOACKEN|BUSFREEREV|AUTO_MSGOUT_DE);
         }
         ahd_outb(ahd, SCSCHKN, CURRFIFODEF|WIDERESEN|SHVALIDSTDIS);
         if ((ahd->chip & AHD_BUS_MASK) == AHD_PCIX)
                 /*
                  * Do not issue a target abort when a split completion
                  * error occurs.  Let our PCIX interrupt handler deal
                  * with it instead. H2A4 Razor #625
                  */
                 ahd_outb(ahd, PCIXCTL, ahd_inb(ahd, PCIXCTL) | SPLTSTADIS);
 
         if ((ahd->bugs & AHD_LQOOVERRUN_BUG) != 0)
                 ahd_outb(ahd, LQOSCSCTL, LQONOCHKOVER);
 
         /*
          * Tweak IOCELL settings.
          */
         if ((ahd->flags & AHD_HP_BOARD) != 0) {
                 for (i = 0; i < NUMDSPS; i++) {
                         ahd_outb(ahd, DSPSELECT, i);
                         ahd_outb(ahd, WRTBIASCTL, WRTBIASCTL_HP_DEFAULT);
                 }
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
                         printf("%s: WRTBIASCTL now 0x%x\n", ahd_name(ahd),
                                WRTBIASCTL_HP_DEFAULT);
 #endif
         }
         ahd_setup_iocell_workaround(ahd);
 
         /*
          * Enable LQI Manager interrupts.
          */
         ahd_outb(ahd, LQIMODE1, ENLQIPHASE_LQ|ENLQIPHASE_NLQ|ENLIQABORT
                               | ENLQICRCI_LQ|ENLQICRCI_NLQ|ENLQIBADLQI
                               | ENLQIOVERI_LQ|ENLQIOVERI_NLQ);
         ahd_outb(ahd, LQOMODE0, ENLQOATNLQ|ENLQOATNPKT|ENLQOTCRC);
         /*
          * We choose to have the sequencer catch LQOPHCHGINPKT errors
          * manually for the command phase at the start of a packetized
          * selection case.  ENLQOBUSFREE should be made redundant by
          * the BUSFREE interrupt, but it seems that some LQOBUSFREE
          * events fail to assert the BUSFREE interrupt so we must
          * also enable LQOBUSFREE interrupts.
          */
         ahd_outb(ahd, LQOMODE1, ENLQOBUSFREE);
 
         /*
          * Setup sequencer interrupt handlers.
          */
         ahd_outw(ahd, INTVEC1_ADDR, ahd_resolve_seqaddr(ahd, LABEL_seq_isr));
         ahd_outw(ahd, INTVEC2_ADDR, ahd_resolve_seqaddr(ahd, LABEL_timer_isr));
 
         /*
          * Setup SCB Offset registers.
          */
         if ((ahd->bugs & AHD_PKT_LUN_BUG) != 0) {
                 ahd_outb(ahd, LUNPTR, offsetof(struct hardware_scb,
                          pkt_long_lun));
         } else {
                 ahd_outb(ahd, LUNPTR, offsetof(struct hardware_scb, lun));
         }
         ahd_outb(ahd, CMDLENPTR, offsetof(struct hardware_scb, cdb_len));
         ahd_outb(ahd, ATTRPTR, offsetof(struct hardware_scb, task_attribute));
         ahd_outb(ahd, FLAGPTR, offsetof(struct hardware_scb, task_management));
         ahd_outb(ahd, CMDPTR, offsetof(struct hardware_scb,
                                        shared_data.idata.cdb));
         ahd_outb(ahd, QNEXTPTR,
                  offsetof(struct hardware_scb, next_hscb_busaddr));
         ahd_outb(ahd, ABRTBITPTR, MK_MESSAGE_BIT_OFFSET);
         ahd_outb(ahd, ABRTBYTEPTR, offsetof(struct hardware_scb, control));
         if ((ahd->bugs & AHD_PKT_LUN_BUG) != 0) {
                 ahd_outb(ahd, LUNLEN,
                          sizeof(ahd->next_queued_hscb->pkt_long_lun) - 1);
         } else {
                 ahd_outb(ahd, LUNLEN, LUNLEN_SINGLE_LEVEL_LUN);
         }
         ahd_outb(ahd, CDBLIMIT, SCB_CDB_LEN_PTR - 1);
         ahd_outb(ahd, MAXCMD, 0xFF);
         ahd_outb(ahd, SCBAUTOPTR,
                  AUSCBPTR_EN | offsetof(struct hardware_scb, tag));
 
         /* We haven't been enabled for target mode yet. */
         ahd_outb(ahd, MULTARGID, 0);
         ahd_outb(ahd, MULTARGID + 1, 0);
 
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         /* Initialize the negotiation table. */
         if ((ahd->features & AHD_NEW_IOCELL_OPTS) == 0) {
                 /*
                  * Clear the spare bytes in the neg table to avoid
                  * spurious parity errors.
                  */
                 for (target = 0; target < AHD_NUM_TARGETS; target++) {
                         ahd_outb(ahd, NEGOADDR, target);
                         ahd_outb(ahd, ANNEXCOL, AHD_ANNEXCOL_PER_DEV0);
                         for (i = 0; i < AHD_NUM_PER_DEV_ANNEXCOLS; i++)
                                 ahd_outb(ahd, ANNEXDAT, 0);
                 }
         }
         for (target = 0; target < AHD_NUM_TARGETS; target++) {
                 struct         ahd_devinfo devinfo;
                 struct         ahd_initiator_tinfo *tinfo;
                 struct         ahd_tmode_tstate *tstate;
 
                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                                             target, &tstate);
                 ahd_compile_devinfo(&devinfo, ahd->our_id,
                                     target, CAM_LUN_WILDCARD,
                                     'A', ROLE_INITIATOR);
                 ahd_update_neg_table(ahd, &devinfo, &tinfo->curr);
         }
 
         ahd_outb(ahd, CLRSINT3, NTRAMPERR|OSRAMPERR);
         ahd_outb(ahd, CLRINT, CLRSCSIINT);
 
 #ifdef NEEDS_MORE_TESTING
         /*
          * Always enable abort on incoming L_Qs if this feature is
          * supported.  We use this to catch invalid SCB references.
          */
         if ((ahd->bugs & AHD_ABORT_LQI_BUG) == 0)
                 ahd_outb(ahd, LQCTL1, ABORTPENDING);
         else
 #endif
                 ahd_outb(ahd, LQCTL1, 0);
 
         /* All of our queues are empty */
         ahd->qoutfifonext = 0;
         ahd->qoutfifonext_valid_tag = QOUTFIFO_ENTRY_VALID;
         ahd_outb(ahd, QOUTFIFO_ENTRY_VALID_TAG, QOUTFIFO_ENTRY_VALID);
         for (i = 0; i < AHD_QOUT_SIZE; i++)
                 ahd->qoutfifo[i].valid_tag = 0;
         ahd_sync_qoutfifo(ahd, BUS_DMASYNC_PREREAD);
 
         ahd->qinfifonext = 0;
         for (i = 0; i < AHD_QIN_SIZE; i++)
                 ahd->qinfifo[i] = SCB_LIST_NULL;
 
         if ((ahd->features & AHD_TARGETMODE) != 0) {
                 /* All target command blocks start out invalid. */
                 for (i = 0; i < AHD_TMODE_CMDS; i++)
                         ahd->targetcmds[i].cmd_valid = 0;
                 ahd_sync_tqinfifo(ahd, BUS_DMASYNC_PREREAD);
                 ahd->tqinfifonext = 1;
                 ahd_outb(ahd, KERNEL_TQINPOS, ahd->tqinfifonext - 1);
                 ahd_outb(ahd, TQINPOS, ahd->tqinfifonext);
         }
 
         /* Initialize Scratch Ram. */
         ahd_outb(ahd, SEQ_FLAGS, 0);
         ahd_outb(ahd, SEQ_FLAGS2, 0);
 
         /* We don't have any waiting selections */
         ahd_outw(ahd, WAITING_TID_HEAD, SCB_LIST_NULL);
         ahd_outw(ahd, WAITING_TID_TAIL, SCB_LIST_NULL);
         ahd_outw(ahd, MK_MESSAGE_SCB, SCB_LIST_NULL);
         ahd_outw(ahd, MK_MESSAGE_SCSIID, 0xFF);
         for (i = 0; i < AHD_NUM_TARGETS; i++)
                 ahd_outw(ahd, WAITING_SCB_TAILS + (2 * i), SCB_LIST_NULL);
 
         /*
          * Nobody is waiting to be DMAed into the QOUTFIFO.
          */
         ahd_outw(ahd, COMPLETE_SCB_HEAD, SCB_LIST_NULL);
         ahd_outw(ahd, COMPLETE_SCB_DMAINPROG_HEAD, SCB_LIST_NULL);
         ahd_outw(ahd, COMPLETE_DMA_SCB_HEAD, SCB_LIST_NULL);
         ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, SCB_LIST_NULL);
         ahd_outw(ahd, COMPLETE_ON_QFREEZE_HEAD, SCB_LIST_NULL);
 
         /*
          * The Freeze Count is 0.
          */
         ahd->qfreeze_cnt = 0;
         ahd_outw(ahd, QFREEZE_COUNT, 0);
         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, 0);
 
         /*
          * Tell the sequencer where it can find our arrays in memory.
          */
         busaddr = ahd->shared_data_map.physaddr;
         ahd_outl(ahd, SHARED_DATA_ADDR, busaddr);
         ahd_outl(ahd, QOUTFIFO_NEXT_ADDR, busaddr);
 
         /*
          * Setup the allowed SCSI Sequences based on operational mode.
          * If we are a target, we'll enable select in operations once
          * we've had a lun enabled.
          */
         scsiseq_template = ENAUTOATNP;
         if ((ahd->flags & AHD_INITIATORROLE) != 0)
                 scsiseq_template |= ENRSELI;
         ahd_outb(ahd, SCSISEQ_TEMPLATE, scsiseq_template);
 
         /* There are no busy SCBs yet. */
         for (target = 0; target < AHD_NUM_TARGETS; target++) {
                 int lun;
 
                 for (lun = 0; lun < AHD_NUM_LUNS_NONPKT; lun++)
                         ahd_unbusy_tcl(ahd, BUILD_TCL_RAW(target, 'A', lun));
         }
 
         /*
          * Initialize the group code to command length table.
          * Vendor Unique codes are set to 0 so we only capture
          * the first byte of the cdb.  These can be overridden
          * when target mode is enabled.
          */
         ahd_outb(ahd, CMDSIZE_TABLE, 5);
         ahd_outb(ahd, CMDSIZE_TABLE + 1, 9);
         ahd_outb(ahd, CMDSIZE_TABLE + 2, 9);
         ahd_outb(ahd, CMDSIZE_TABLE + 3, 0);
         ahd_outb(ahd, CMDSIZE_TABLE + 4, 15);
         ahd_outb(ahd, CMDSIZE_TABLE + 5, 11);
         ahd_outb(ahd, CMDSIZE_TABLE + 6, 0);
         ahd_outb(ahd, CMDSIZE_TABLE + 7, 0);
                 
         /* Tell the sequencer of our initial queue positions */
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
         ahd_outb(ahd, QOFF_CTLSTA, SCB_QSIZE_512);
         ahd->qinfifonext = 0;
         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
         ahd_set_hescb_qoff(ahd, 0);
         ahd_set_snscb_qoff(ahd, 0);
         ahd_set_sescb_qoff(ahd, 0);
         ahd_set_sdscb_qoff(ahd, 0);
 
         /*
          * Tell the sequencer which SCB will be the next one it receives.
          */
         busaddr = ahd_le32toh(ahd->next_queued_hscb->hscb_busaddr);
         ahd_outl(ahd, NEXT_QUEUED_SCB_ADDR, busaddr);
 
         /*
          * Default to coalescing disabled.
          */
         ahd_outw(ahd, INT_COALESCING_CMDCOUNT, 0);
         ahd_outw(ahd, CMDS_PENDING, 0);
         ahd_update_coalescing_values(ahd, ahd->int_coalescing_timer,
                                      ahd->int_coalescing_maxcmds,
                                      ahd->int_coalescing_mincmds);
         ahd_enable_coalescing(ahd, FALSE);
 
         ahd_loadseq(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         if (ahd->features & AHD_AIC79XXB_SLOWCRC) {
                 u_int negodat3 = ahd_inb(ahd, NEGCONOPTS);
 
                 negodat3 |= ENSLOWCRC;
                 ahd_outb(ahd, NEGCONOPTS, negodat3);
                 negodat3 = ahd_inb(ahd, NEGCONOPTS);
                 if (!(negodat3 & ENSLOWCRC))
                         printf("aic79xx: failed to set the SLOWCRC bit\n");
                 else
                         printf("aic79xx: SLOWCRC bit set\n");
         }
 }
 
 /*
  * Setup default device and controller settings.
  * This should only be called if our probe has
  * determined that no configuration data is available.
  */
 int
 ahd_default_config(struct ahd_softc *ahd)
 {
         int        targ;
 
         ahd->our_id = 7;
 
         /*
          * Allocate a tstate to house information for our
          * initiator presence on the bus as well as the user
          * data for any target mode initiator.
          */
         if (ahd_alloc_tstate(ahd, ahd->our_id, 'A') == NULL) {
                 printf("%s: unable to allocate ahd_tmode_tstate.  "
                        "Failing attach\n", ahd_name(ahd));
                 return (ENOMEM);
         }
 
         for (targ = 0; targ < AHD_NUM_TARGETS; targ++) {
                 struct         ahd_devinfo devinfo;
                 struct         ahd_initiator_tinfo *tinfo;
                 struct         ahd_tmode_tstate *tstate;
                 uint16_t target_mask;
 
                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                                             targ, &tstate);
                 /*
                  * We support SPC2 and SPI4.
                  */
                 tinfo->user.protocol_version = 4;
                 tinfo->user.transport_version = 4;
 
                 target_mask = 0x01 << targ;
                 ahd->user_discenable |= target_mask;
                 tstate->discenable |= target_mask;
                 ahd->user_tagenable |= target_mask;
 #ifdef AHD_FORCE_160
                 tinfo->user.period = AHD_SYNCRATE_DT;
 #else
                 tinfo->user.period = AHD_SYNCRATE_160;
 #endif
                 tinfo->user.offset = MAX_OFFSET;
                 tinfo->user.ppr_options = MSG_EXT_PPR_RD_STRM
                                         | MSG_EXT_PPR_WR_FLOW
                                         | MSG_EXT_PPR_HOLD_MCS
                                         | MSG_EXT_PPR_IU_REQ
                                         | MSG_EXT_PPR_QAS_REQ
                                         | MSG_EXT_PPR_DT_REQ;
                 if ((ahd->features & AHD_RTI) != 0)
                         tinfo->user.ppr_options |= MSG_EXT_PPR_RTI;
 
                 tinfo->user.width = MSG_EXT_WDTR_BUS_16_BIT;
 
                 /*
                  * Start out Async/Narrow/Untagged and with
                  * conservative protocol support.
                  */
                 tinfo->goal.protocol_version = 2;
                 tinfo->goal.transport_version = 2;
                 tinfo->curr.protocol_version = 2;
                 tinfo->curr.transport_version = 2;
                 ahd_compile_devinfo(&devinfo, ahd->our_id,
                                     targ, CAM_LUN_WILDCARD,
                                     'A', ROLE_INITIATOR);
                 tstate->tagenable &= ~target_mask;
                 ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                               AHD_TRANS_CUR|AHD_TRANS_GOAL, /*paused*/TRUE);
                 ahd_set_syncrate(ahd, &devinfo, /*period*/0, /*offset*/0,
                                  /*ppr_options*/0, AHD_TRANS_CUR|AHD_TRANS_GOAL,
                                  /*paused*/TRUE);
         }
         return (0);
 }
 
 /*
  * Parse device configuration information.
  */
 int
 ahd_parse_cfgdata(struct ahd_softc *ahd, struct seeprom_config *sc)
 {
         int targ;
         int max_targ;
 
         max_targ = sc->max_targets & CFMAXTARG;
         ahd->our_id = sc->brtime_id & CFSCSIID;
 
         /*
          * Allocate a tstate to house information for our
          * initiator presence on the bus as well as the user
          * data for any target mode initiator.
          */
         if (ahd_alloc_tstate(ahd, ahd->our_id, 'A') == NULL) {
                 printf("%s: unable to allocate ahd_tmode_tstate.  "
                        "Failing attach\n", ahd_name(ahd));
                 return (ENOMEM);
         }
 
         for (targ = 0; targ < max_targ; targ++) {
                 struct         ahd_devinfo devinfo;
                 struct         ahd_initiator_tinfo *tinfo;
                 struct         ahd_transinfo *user_tinfo;
                 struct         ahd_tmode_tstate *tstate;
                 uint16_t target_mask;
 
                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                                             targ, &tstate);
                 user_tinfo = &tinfo->user;
 
                 /*
                  * We support SPC2 and SPI4.
                  */
                 tinfo->user.protocol_version = 4;
                 tinfo->user.transport_version = 4;
 
                 target_mask = 0x01 << targ;
                 ahd->user_discenable &= ~target_mask;
                 tstate->discenable &= ~target_mask;
                 ahd->user_tagenable &= ~target_mask;
                 if (sc->device_flags[targ] & CFDISC) {
                         tstate->discenable |= target_mask;
                         ahd->user_discenable |= target_mask;
                         ahd->user_tagenable |= target_mask;
                 } else {
                         /*
                          * Cannot be packetized without disconnection.
                          */
                         sc->device_flags[targ] &= ~CFPACKETIZED;
                 }
 
                 user_tinfo->ppr_options = 0;
                 user_tinfo->period = (sc->device_flags[targ] & CFXFER);
                 if (user_tinfo->period < CFXFER_ASYNC) {
                         if (user_tinfo->period <= AHD_PERIOD_10MHz)
                                 user_tinfo->ppr_options |= MSG_EXT_PPR_DT_REQ;
                         user_tinfo->offset = MAX_OFFSET;
                 } else  {
                         user_tinfo->offset = 0;
                         user_tinfo->period = AHD_ASYNC_XFER_PERIOD;
                 }
 #ifdef AHD_FORCE_160
                 if (user_tinfo->period <= AHD_SYNCRATE_160)
                         user_tinfo->period = AHD_SYNCRATE_DT;
 #endif
 
                 if ((sc->device_flags[targ] & CFPACKETIZED) != 0) {
                         user_tinfo->ppr_options |= MSG_EXT_PPR_RD_STRM
                                                 |  MSG_EXT_PPR_WR_FLOW
                                                 |  MSG_EXT_PPR_HOLD_MCS
                                                 |  MSG_EXT_PPR_IU_REQ;
                         if ((ahd->features & AHD_RTI) != 0)
                                 user_tinfo->ppr_options |= MSG_EXT_PPR_RTI;
                 }
 
                 if ((sc->device_flags[targ] & CFQAS) != 0)
                         user_tinfo->ppr_options |= MSG_EXT_PPR_QAS_REQ;
 
                 if ((sc->device_flags[targ] & CFWIDEB) != 0)
                         user_tinfo->width = MSG_EXT_WDTR_BUS_16_BIT;
                 else
                         user_tinfo->width = MSG_EXT_WDTR_BUS_8_BIT;
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
                         printf("(%d): %x:%x:%x:%x\n", targ, user_tinfo->width,
                                user_tinfo->period, user_tinfo->offset,
                                user_tinfo->ppr_options);
 #endif
                 /*
                  * Start out Async/Narrow/Untagged and with
                  * conservative protocol support.
                  */
                 tstate->tagenable &= ~target_mask;
                 tinfo->goal.protocol_version = 2;
                 tinfo->goal.transport_version = 2;
                 tinfo->curr.protocol_version = 2;
                 tinfo->curr.transport_version = 2;
                 ahd_compile_devinfo(&devinfo, ahd->our_id,
                                     targ, CAM_LUN_WILDCARD,
                                     'A', ROLE_INITIATOR);
                 ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                               AHD_TRANS_CUR|AHD_TRANS_GOAL, /*paused*/TRUE);
                 ahd_set_syncrate(ahd, &devinfo, /*period*/0, /*offset*/0,
                                  /*ppr_options*/0, AHD_TRANS_CUR|AHD_TRANS_GOAL,
                                  /*paused*/TRUE);
         }
 
         ahd->flags &= ~AHD_SPCHK_ENB_A;
         if (sc->bios_control & CFSPARITY)
                 ahd->flags |= AHD_SPCHK_ENB_A;
 
         ahd->flags &= ~AHD_RESET_BUS_A;
         if (sc->bios_control & CFRESETB)
                 ahd->flags |= AHD_RESET_BUS_A;
 
         ahd->flags &= ~AHD_EXTENDED_TRANS_A;
         if (sc->bios_control & CFEXTEND)
                 ahd->flags |= AHD_EXTENDED_TRANS_A;
 
         ahd->flags &= ~AHD_BIOS_ENABLED;
         if ((sc->bios_control & CFBIOSSTATE) == CFBS_ENABLED)
                 ahd->flags |= AHD_BIOS_ENABLED;
 
         ahd->flags &= ~AHD_STPWLEVEL_A;
         if ((sc->adapter_control & CFSTPWLEVEL) != 0)
                 ahd->flags |= AHD_STPWLEVEL_A;
 
         return (0);
 }
 
 /*
  * Parse device configuration information.
  */
 int
 ahd_parse_vpddata(struct ahd_softc *ahd, struct vpd_config *vpd)
 {
         int error;
 
         error = ahd_verify_vpd_cksum(vpd);
         if (error == 0)
                 return (EINVAL);
         if ((vpd->bios_flags & VPDBOOTHOST) != 0)
                 ahd->flags |= AHD_BOOT_CHANNEL;
         return (0);
 }
 
 void
 ahd_intr_enable(struct ahd_softc *ahd, int enable)
 {
         u_int hcntrl;
 
         hcntrl = ahd_inb(ahd, HCNTRL);
         hcntrl &= ~INTEN;
         ahd->pause &= ~INTEN;
         ahd->unpause &= ~INTEN;
         if (enable) {
                 hcntrl |= INTEN;
                 ahd->pause |= INTEN;
                 ahd->unpause |= INTEN;
         }
         ahd_outb(ahd, HCNTRL, hcntrl);
 }
 
 static void
 ahd_update_coalescing_values(struct ahd_softc *ahd, u_int timer, u_int maxcmds,
                              u_int mincmds)
 {
         if (timer > AHD_TIMER_MAX_US)
                 timer = AHD_TIMER_MAX_US;
         ahd->int_coalescing_timer = timer;
 
         if (maxcmds > AHD_INT_COALESCING_MAXCMDS_MAX)
                 maxcmds = AHD_INT_COALESCING_MAXCMDS_MAX;
         if (mincmds > AHD_INT_COALESCING_MINCMDS_MAX)
                 mincmds = AHD_INT_COALESCING_MINCMDS_MAX;
         ahd->int_coalescing_maxcmds = maxcmds;
         ahd_outw(ahd, INT_COALESCING_TIMER, timer / AHD_TIMER_US_PER_TICK);
         ahd_outb(ahd, INT_COALESCING_MAXCMDS, -maxcmds);
         ahd_outb(ahd, INT_COALESCING_MINCMDS, -mincmds);
 }
 
 static void
 ahd_enable_coalescing(struct ahd_softc *ahd, int enable)
 {
 
         ahd->hs_mailbox &= ~ENINT_COALESCE;
         if (enable)
                 ahd->hs_mailbox |= ENINT_COALESCE;
         ahd_outb(ahd, HS_MAILBOX, ahd->hs_mailbox);
         ahd_flush_device_writes(ahd);
         ahd_run_qoutfifo(ahd);
 }
 
 /*
  * Ensure that the card is paused in a location
  * outside of all critical sections and that all
  * pending work is completed prior to returning.
  * This routine should only be called from outside
  * an interrupt context.
  */
 void
 ahd_pause_and_flushwork(struct ahd_softc *ahd)
 {
         u_int intstat;
         u_int maxloops;
 
         maxloops = 1000;
         ahd->flags |= AHD_ALL_INTERRUPTS;
         ahd_pause(ahd);
         /*
          * Freeze the outgoing selections.  We do this only
          * until we are safely paused without further selections
          * pending.
          */
         ahd->qfreeze_cnt--;
         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, ahd->qfreeze_cnt);
         ahd_outb(ahd, SEQ_FLAGS2, ahd_inb(ahd, SEQ_FLAGS2) | SELECTOUT_QFROZEN);
         do {
 
                 ahd_unpause(ahd);
                 /*
                  * Give the sequencer some time to service
                  * any active selections.
                  */
                 ahd_delay(500);
 
                 ahd_intr(ahd);
                 ahd_pause(ahd);
                 intstat = ahd_inb(ahd, INTSTAT);
                 if ((intstat & INT_PEND) == 0) {
                         ahd_clear_critical_section(ahd);
                         intstat = ahd_inb(ahd, INTSTAT);
                 }
         } while (--maxloops
               && (intstat != 0xFF || (ahd->features & AHD_REMOVABLE) == 0)
               && ((intstat & INT_PEND) != 0
                || (ahd_inb(ahd, SCSISEQ0) & ENSELO) != 0
                || (ahd_inb(ahd, SSTAT0) & (SELDO|SELINGO)) != 0));
 
         if (maxloops == 0) {
                 printf("Infinite interrupt loop, INTSTAT = %x",
                       ahd_inb(ahd, INTSTAT));
         }
         ahd->qfreeze_cnt++;
         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, ahd->qfreeze_cnt);
 
         ahd_flush_qoutfifo(ahd);
 
         ahd->flags &= ~AHD_ALL_INTERRUPTS;
 }
 
 #ifdef CONFIG_PM
 int
 ahd_suspend(struct ahd_softc *ahd)
 {
 
         ahd_pause_and_flushwork(ahd);
 
         if (LIST_FIRST(&ahd->pending_scbs) != NULL) {
                 ahd_unpause(ahd);
                 return (EBUSY);
         }
         ahd_shutdown(ahd);
         return (0);
 }
 
 void
 ahd_resume(struct ahd_softc *ahd)
 {
 
         ahd_reset(ahd, /*reinit*/TRUE);
         ahd_intr_enable(ahd, TRUE); 
         ahd_restart(ahd);
 }
 #endif
 
 /************************** Busy Target Table *********************************/
 /*
  * Set SCBPTR to the SCB that contains the busy
  * table entry for TCL.  Return the offset into
  * the SCB that contains the entry for TCL.
  * saved_scbid is dereferenced and set to the
  * scbid that should be restored once manipualtion
  * of the TCL entry is complete.
  */
 static __inline u_int
 ahd_index_busy_tcl(struct ahd_softc *ahd, u_int *saved_scbid, u_int tcl)
 {
         /*
          * Index to the SCB that contains the busy entry.
          */
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
         *saved_scbid = ahd_get_scbptr(ahd);
         ahd_set_scbptr(ahd, TCL_LUN(tcl)
                      | ((TCL_TARGET_OFFSET(tcl) & 0xC) << 4));
 
         /*
          * And now calculate the SCB offset to the entry.
          * Each entry is 2 bytes wide, hence the
          * multiplication by 2.
          */
         return (((TCL_TARGET_OFFSET(tcl) & 0x3) << 1) + SCB_DISCONNECTED_LISTS);
 }
 
 /*
  * Return the untagged transaction id for a given target/channel lun.
  */
 static u_int
 ahd_find_busy_tcl(struct ahd_softc *ahd, u_int tcl)
 {
         u_int scbid;
         u_int scb_offset;
         u_int saved_scbptr;
                 
         scb_offset = ahd_index_busy_tcl(ahd, &saved_scbptr, tcl);
         scbid = ahd_inw_scbram(ahd, scb_offset);
         ahd_set_scbptr(ahd, saved_scbptr);
         return (scbid);
 }
 
 static void
 ahd_busy_tcl(struct ahd_softc *ahd, u_int tcl, u_int scbid)
 {
         u_int scb_offset;
         u_int saved_scbptr;
                 
         scb_offset = ahd_index_busy_tcl(ahd, &saved_scbptr, tcl);
         ahd_outw(ahd, scb_offset, scbid);
         ahd_set_scbptr(ahd, saved_scbptr);
 }
 
 /************************** SCB and SCB queue management **********************/
 static int
 ahd_match_scb(struct ahd_softc *ahd, struct scb *scb, int target,
               char channel, int lun, u_int tag, role_t role)
 {
         int targ = SCB_GET_TARGET(ahd, scb);
         char chan = SCB_GET_CHANNEL(ahd, scb);
         int slun = SCB_GET_LUN(scb);
         int match;
 
         match = ((chan == channel) || (channel == ALL_CHANNELS));
         if (match != 0)
                 match = ((targ == target) || (target == CAM_TARGET_WILDCARD));
         if (match != 0)
                 match = ((lun == slun) || (lun == CAM_LUN_WILDCARD));
         if (match != 0) {
 #ifdef AHD_TARGET_MODE
                 int group;
 
                 group = XPT_FC_GROUP(scb->io_ctx->ccb_h.func_code);
                 if (role == ROLE_INITIATOR) {
                         match = (group != XPT_FC_GROUP_TMODE)
                               && ((tag == SCB_GET_TAG(scb))
                                || (tag == SCB_LIST_NULL));
                 } else if (role == ROLE_TARGET) {
                         match = (group == XPT_FC_GROUP_TMODE)
                               && ((tag == scb->io_ctx->csio.tag_id)
                                || (tag == SCB_LIST_NULL));
                 }
 #else /* !AHD_TARGET_MODE */
                 match = ((tag == SCB_GET_TAG(scb)) || (tag == SCB_LIST_NULL));
 #endif /* AHD_TARGET_MODE */
         }
 
         return match;
 }
 
 static void
 ahd_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
 {
         int        target;
         char        channel;
         int        lun;
 
         target = SCB_GET_TARGET(ahd, scb);
         lun = SCB_GET_LUN(scb);
         channel = SCB_GET_CHANNEL(ahd, scb);
         
         ahd_search_qinfifo(ahd, target, channel, lun,
                            /*tag*/SCB_LIST_NULL, ROLE_UNKNOWN,
                            CAM_REQUEUE_REQ, SEARCH_COMPLETE);
 
         ahd_platform_freeze_devq(ahd, scb);
 }
 
 void
 ahd_qinfifo_requeue_tail(struct ahd_softc *ahd, struct scb *scb)
 {
         struct scb        *prev_scb;
         ahd_mode_state         saved_modes;
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
         prev_scb = NULL;
         if (ahd_qinfifo_count(ahd) != 0) {
                 u_int prev_tag;
                 u_int prev_pos;
 
                 prev_pos = AHD_QIN_WRAP(ahd->qinfifonext - 1);
                 prev_tag = ahd->qinfifo[prev_pos];
                 prev_scb = ahd_lookup_scb(ahd, prev_tag);
         }
         ahd_qinfifo_requeue(ahd, prev_scb, scb);
         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
         ahd_restore_modes(ahd, saved_modes);
 }
 
 static void
 ahd_qinfifo_requeue(struct ahd_softc *ahd, struct scb *prev_scb,
                     struct scb *scb)
 {
         if (prev_scb == NULL) {
                 uint32_t busaddr;
 
                 busaddr = ahd_le32toh(scb->hscb->hscb_busaddr);
                 ahd_outl(ahd, NEXT_QUEUED_SCB_ADDR, busaddr);
         } else {
                 prev_scb->hscb->next_hscb_busaddr = scb->hscb->hscb_busaddr;
                 ahd_sync_scb(ahd, prev_scb, 
                              BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
         }
         ahd->qinfifo[AHD_QIN_WRAP(ahd->qinfifonext)] = SCB_GET_TAG(scb);
         ahd->qinfifonext++;
         scb->hscb->next_hscb_busaddr = ahd->next_queued_hscb->hscb_busaddr;
         ahd_sync_scb(ahd, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
 }
 
 static int
 ahd_qinfifo_count(struct ahd_softc *ahd)
 {
         u_int qinpos;
         u_int wrap_qinpos;
         u_int wrap_qinfifonext;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
         qinpos = ahd_get_snscb_qoff(ahd);
         wrap_qinpos = AHD_QIN_WRAP(qinpos);
         wrap_qinfifonext = AHD_QIN_WRAP(ahd->qinfifonext);
         if (wrap_qinfifonext >= wrap_qinpos)
                 return (wrap_qinfifonext - wrap_qinpos);
         else
                 return (wrap_qinfifonext
                       + ARRAY_SIZE(ahd->qinfifo) - wrap_qinpos);
 }
 
 static void
 ahd_reset_cmds_pending(struct ahd_softc *ahd)
 {
         struct                scb *scb;
         ahd_mode_state        saved_modes;
         u_int                pending_cmds;
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
 
         /*
          * Don't count any commands as outstanding that the
          * sequencer has already marked for completion.
          */
         ahd_flush_qoutfifo(ahd);
 
         pending_cmds = 0;
         LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
                 pending_cmds++;
         }
         ahd_outw(ahd, CMDS_PENDING, pending_cmds - ahd_qinfifo_count(ahd));
         ahd_restore_modes(ahd, saved_modes);
         ahd->flags &= ~AHD_UPDATE_PEND_CMDS;
 }
 
 static void
 ahd_done_with_status(struct ahd_softc *ahd, struct scb *scb, uint32_t status)
 {
         cam_status ostat;
         cam_status cstat;
 
         ostat = ahd_get_transaction_status(scb);
         if (ostat == CAM_REQ_INPROG)
                 ahd_set_transaction_status(scb, status);
         cstat = ahd_get_transaction_status(scb);
         if (cstat != CAM_REQ_CMP)
                 ahd_freeze_scb(scb);
         ahd_done(ahd, scb);
 }
 
 int
 ahd_search_qinfifo(struct ahd_softc *ahd, int target, char channel,
                    int lun, u_int tag, role_t role, uint32_t status,
                    ahd_search_action action)
 {
         struct scb        *scb;
         struct scb        *mk_msg_scb;
         struct scb        *prev_scb;
         ahd_mode_state         saved_modes;
         u_int                 qinstart;
         u_int                 qinpos;
         u_int                 qintail;
         u_int                 tid_next;
         u_int                 tid_prev;
         u_int                 scbid;
         u_int                 seq_flags2;
         u_int                 savedscbptr;
         uint32_t         busaddr;
         int                 found;
         int                 targets;
 
         /* Must be in CCHAN mode */
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
 
         /*
          * Halt any pending SCB DMA.  The sequencer will reinitiate
          * this dma if the qinfifo is not empty once we unpause.
          */
         if ((ahd_inb(ahd, CCSCBCTL) & (CCARREN|CCSCBEN|CCSCBDIR))
          == (CCARREN|CCSCBEN|CCSCBDIR)) {
                 ahd_outb(ahd, CCSCBCTL,
                          ahd_inb(ahd, CCSCBCTL) & ~(CCARREN|CCSCBEN));
                 while ((ahd_inb(ahd, CCSCBCTL) & (CCARREN|CCSCBEN)) != 0)
                         ;
         }
         /* Determine sequencer's position in the qinfifo. */
         qintail = AHD_QIN_WRAP(ahd->qinfifonext);
         qinstart = ahd_get_snscb_qoff(ahd);
         qinpos = AHD_QIN_WRAP(qinstart);
         found = 0;
         prev_scb = NULL;
 
         if (action == SEARCH_PRINT) {
                 printf("qinstart = %d qinfifonext = %d\nQINFIFO:",
                        qinstart, ahd->qinfifonext);
         }
 
         /*
          * Start with an empty queue.  Entries that are not chosen
          * for removal will be re-added to the queue as we go.
          */
         ahd->qinfifonext = qinstart;
         busaddr = ahd_le32toh(ahd->next_queued_hscb->hscb_busaddr);
         ahd_outl(ahd, NEXT_QUEUED_SCB_ADDR, busaddr);
 
         while (qinpos != qintail) {
                 scb = ahd_lookup_scb(ahd, ahd->qinfifo[qinpos]);
                 if (scb == NULL) {
                         printf("qinpos = %d, SCB index = %d\n",
                                 qinpos, ahd->qinfifo[qinpos]);
                         panic("Loop 1\n");
                 }
 
                 if (ahd_match_scb(ahd, scb, target, channel, lun, tag, role)) {
                         /*
                          * We found an scb that needs to be acted on.
                          */
                         found++;
                         switch (action) {
                         case SEARCH_COMPLETE:
                                 if ((scb->flags & SCB_ACTIVE) == 0)
                                         printf("Inactive SCB in qinfifo\n");
                                 ahd_done_with_status(ahd, scb, status);
                                 /* FALLTHROUGH */
                         case SEARCH_REMOVE:
                                 break;
                         case SEARCH_PRINT:
                                 printf(" 0x%x", ahd->qinfifo[qinpos]);
                                 /* FALLTHROUGH */
                         case SEARCH_COUNT:
                                 ahd_qinfifo_requeue(ahd, prev_scb, scb);
                                 prev_scb = scb;
                                 break;
                         }
                 } else {
                         ahd_qinfifo_requeue(ahd, prev_scb, scb);
                         prev_scb = scb;
                 }
                 qinpos = AHD_QIN_WRAP(qinpos+1);
         }
 
         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
 
         if (action == SEARCH_PRINT)
                 printf("\nWAITING_TID_QUEUES:\n");
 
         /*
          * Search waiting for selection lists.  We traverse the
          * list of "their ids" waiting for selection and, if
          * appropriate, traverse the SCBs of each "their id"
          * looking for matches.
          */
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         seq_flags2 = ahd_inb(ahd, SEQ_FLAGS2);
         if ((seq_flags2 & PENDING_MK_MESSAGE) != 0) {
                 scbid = ahd_inw(ahd, MK_MESSAGE_SCB);
                 mk_msg_scb = ahd_lookup_scb(ahd, scbid);
         } else
                 mk_msg_scb = NULL;
         savedscbptr = ahd_get_scbptr(ahd);
         tid_next = ahd_inw(ahd, WAITING_TID_HEAD);
         tid_prev = SCB_LIST_NULL;
         targets = 0;
         for (scbid = tid_next; !SCBID_IS_NULL(scbid); scbid = tid_next) {
                 u_int tid_head;
                 u_int tid_tail;
 
                 targets++;
                 if (targets > AHD_NUM_TARGETS)
                         panic("TID LIST LOOP");
 
                 if (scbid >= ahd->scb_data.numscbs) {
                         printf("%s: Waiting TID List inconsistency. "
                                "SCB index == 0x%x, yet numscbs == 0x%x.",
                                ahd_name(ahd), scbid, ahd->scb_data.numscbs);
                         ahd_dump_card_state(ahd);
                         panic("for safety");
                 }
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: SCB = 0x%x Not Active!\n",
                                ahd_name(ahd), scbid);
                         panic("Waiting TID List traversal\n");
                 }
                 ahd_set_scbptr(ahd, scbid);
                 tid_next = ahd_inw_scbram(ahd, SCB_NEXT2);
                 if (ahd_match_scb(ahd, scb, target, channel, CAM_LUN_WILDCARD,
                                   SCB_LIST_NULL, ROLE_UNKNOWN) == 0) {
                         tid_prev = scbid;
                         continue;
                 }
 
                 /*
                  * We found a list of scbs that needs to be searched.
                  */
                 if (action == SEARCH_PRINT)
                         printf("       %d ( ", SCB_GET_TARGET(ahd, scb));
                 tid_head = scbid;
                 found += ahd_search_scb_list(ahd, target, channel,
                                              lun, tag, role, status,
                                              action, &tid_head, &tid_tail,
                                              SCB_GET_TARGET(ahd, scb));
                 /*
                  * Check any MK_MESSAGE SCB that is still waiting to
                  * enter this target's waiting for selection queue.
                  */
                 if (mk_msg_scb != NULL
                  && ahd_match_scb(ahd, mk_msg_scb, target, channel,
                                   lun, tag, role)) {
 
                         /*
                          * We found an scb that needs to be acted on.
                          */
                         found++;
                         switch (action) {
                         case SEARCH_COMPLETE:
                                 if ((mk_msg_scb->flags & SCB_ACTIVE) == 0)
                                         printf("Inactive SCB pending MK_MSG\n");
                                 ahd_done_with_status(ahd, mk_msg_scb, status);
                                 /* FALLTHROUGH */
                         case SEARCH_REMOVE:
                         {
                                 u_int tail_offset;
 
                                 printf("Removing MK_MSG scb\n");
 
                                 /*
                                  * Reset our tail to the tail of the
                                  * main per-target list.
                                  */
                                 tail_offset = WAITING_SCB_TAILS
                                     + (2 * SCB_GET_TARGET(ahd, mk_msg_scb));
                                 ahd_outw(ahd, tail_offset, tid_tail);
 
                                 seq_flags2 &= ~PENDING_MK_MESSAGE;
                                 ahd_outb(ahd, SEQ_FLAGS2, seq_flags2);
                                 ahd_outw(ahd, CMDS_PENDING,
                                          ahd_inw(ahd, CMDS_PENDING)-1);
                                 mk_msg_scb = NULL;
                                 break;
                         }
                         case SEARCH_PRINT:
                                 printf(" 0x%x", SCB_GET_TAG(scb));
                                 /* FALLTHROUGH */
                         case SEARCH_COUNT:
                                 break;
                         }
                 }
 
                 if (mk_msg_scb != NULL
                  && SCBID_IS_NULL(tid_head)
                  && ahd_match_scb(ahd, scb, target, channel, CAM_LUN_WILDCARD,
                                   SCB_LIST_NULL, ROLE_UNKNOWN)) {
 
                         /*
                          * When removing the last SCB for a target
                          * queue with a pending MK_MESSAGE scb, we
                          * must queue the MK_MESSAGE scb.
                          */
                         printf("Queueing mk_msg_scb\n");
                         tid_head = ahd_inw(ahd, MK_MESSAGE_SCB);
                         seq_flags2 &= ~PENDING_MK_MESSAGE;
                         ahd_outb(ahd, SEQ_FLAGS2, seq_flags2);
                         mk_msg_scb = NULL;
                 }
                 if (tid_head != scbid)
                         ahd_stitch_tid_list(ahd, tid_prev, tid_head, tid_next);
                 if (!SCBID_IS_NULL(tid_head))
                         tid_prev = tid_head;
                 if (action == SEARCH_PRINT)
                         printf(")\n");
         }
 
         /* Restore saved state. */
         ahd_set_scbptr(ahd, savedscbptr);
         ahd_restore_modes(ahd, saved_modes);
         return (found);
 }
 
 static int
 ahd_search_scb_list(struct ahd_softc *ahd, int target, char channel,
                     int lun, u_int tag, role_t role, uint32_t status,
                     ahd_search_action action, u_int *list_head, 
                     u_int *list_tail, u_int tid)
 {
         struct        scb *scb;
         u_int        scbid;
         u_int        next;
         u_int        prev;
         int        found;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
         found = 0;
         prev = SCB_LIST_NULL;
         next = *list_head;
         *list_tail = SCB_LIST_NULL;
         for (scbid = next; !SCBID_IS_NULL(scbid); scbid = next) {
                 if (scbid >= ahd->scb_data.numscbs) {
                         printf("%s:SCB List inconsistency. "
                                "SCB == 0x%x, yet numscbs == 0x%x.",
                                ahd_name(ahd), scbid, ahd->scb_data.numscbs);
                         ahd_dump_card_state(ahd);
                         panic("for safety");
                 }
                 scb = ahd_lookup_scb(ahd, scbid);
                 if (scb == NULL) {
                         printf("%s: SCB = %d Not Active!\n",
                                ahd_name(ahd), scbid);
                         panic("Waiting List traversal\n");
                 }
                 ahd_set_scbptr(ahd, scbid);
                 *list_tail = scbid;
                 next = ahd_inw_scbram(ahd, SCB_NEXT);
                 if (ahd_match_scb(ahd, scb, target, channel,
                                   lun, SCB_LIST_NULL, role) == 0) {
                         prev = scbid;
                         continue;
                 }
                 found++;
                 switch (action) {
                 case SEARCH_COMPLETE:
                         if ((scb->flags & SCB_ACTIVE) == 0)
                                 printf("Inactive SCB in Waiting List\n");
                         ahd_done_with_status(ahd, scb, status);
                         /* FALLTHROUGH */
                 case SEARCH_REMOVE:
                         ahd_rem_wscb(ahd, scbid, prev, next, tid);
                         *list_tail = prev;
                         if (SCBID_IS_NULL(prev))
                                 *list_head = next;
                         break;
                 case SEARCH_PRINT:
                         printf("0x%x ", scbid);
                 case SEARCH_COUNT:
                         prev = scbid;
                         break;
                 }
                 if (found > AHD_SCB_MAX)
                         panic("SCB LIST LOOP");
         }
         if (action == SEARCH_COMPLETE
          || action == SEARCH_REMOVE)
                 ahd_outw(ahd, CMDS_PENDING, ahd_inw(ahd, CMDS_PENDING) - found);
         return (found);
 }
 
 static void
 ahd_stitch_tid_list(struct ahd_softc *ahd, u_int tid_prev,
                     u_int tid_cur, u_int tid_next)
 {
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
 
         if (SCBID_IS_NULL(tid_cur)) {
 
                 /* Bypass current TID list */
                 if (SCBID_IS_NULL(tid_prev)) {
                         ahd_outw(ahd, WAITING_TID_HEAD, tid_next);
                 } else {
                         ahd_set_scbptr(ahd, tid_prev);
                         ahd_outw(ahd, SCB_NEXT2, tid_next);
                 }
                 if (SCBID_IS_NULL(tid_next))
                         ahd_outw(ahd, WAITING_TID_TAIL, tid_prev);
         } else {
 
                 /* Stitch through tid_cur */
                 if (SCBID_IS_NULL(tid_prev)) {
                         ahd_outw(ahd, WAITING_TID_HEAD, tid_cur);
                 } else {
                         ahd_set_scbptr(ahd, tid_prev);
                         ahd_outw(ahd, SCB_NEXT2, tid_cur);
                 }
                 ahd_set_scbptr(ahd, tid_cur);
                 ahd_outw(ahd, SCB_NEXT2, tid_next);
 
                 if (SCBID_IS_NULL(tid_next))
                         ahd_outw(ahd, WAITING_TID_TAIL, tid_cur);
         }
 }
 
 /*
  * Manipulate the waiting for selection list and return the
  * scb that follows the one that we remove.
  */
 static u_int
 ahd_rem_wscb(struct ahd_softc *ahd, u_int scbid,
              u_int prev, u_int next, u_int tid)
 {
         u_int tail_offset;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
         if (!SCBID_IS_NULL(prev)) {
                 ahd_set_scbptr(ahd, prev);
                 ahd_outw(ahd, SCB_NEXT, next);
         }
 
         /*
          * SCBs that have MK_MESSAGE set in them may
          * cause the tail pointer to be updated without
          * setting the next pointer of the previous tail.
          * Only clear the tail if the removed SCB was
          * the tail.
          */
         tail_offset = WAITING_SCB_TAILS + (2 * tid);
         if (SCBID_IS_NULL(next)
          && ahd_inw(ahd, tail_offset) == scbid)
                 ahd_outw(ahd, tail_offset, prev);
 
         ahd_add_scb_to_free_list(ahd, scbid);
         return (next);
 }
 
 /*
  * Add the SCB as selected by SCBPTR onto the on chip list of
  * free hardware SCBs.  This list is empty/unused if we are not
  * performing SCB paging.
  */
 static void
 ahd_add_scb_to_free_list(struct ahd_softc *ahd, u_int scbid)
 {
 /* XXX Need some other mechanism to designate "free". */
         /*
          * Invalidate the tag so that our abort
          * routines don't think it's active.
         ahd_outb(ahd, SCB_TAG, SCB_LIST_NULL);
          */
 }
 
 /******************************** Error Handling ******************************/
 /*
  * Abort all SCBs that match the given description (target/channel/lun/tag),
  * setting their status to the passed in status if the status has not already
  * been modified from CAM_REQ_INPROG.  This routine assumes that the sequencer
  * is paused before it is called.
  */
 static int
 ahd_abort_scbs(struct ahd_softc *ahd, int target, char channel,
                int lun, u_int tag, role_t role, uint32_t status)
 {
         struct                scb *scbp;
         struct                scb *scbp_next;
         u_int                i, j;
         u_int                maxtarget;
         u_int                minlun;
         u_int                maxlun;
         int                found;
         ahd_mode_state        saved_modes;
 
         /* restore this when we're done */
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         found = ahd_search_qinfifo(ahd, target, channel, lun, SCB_LIST_NULL,
                                    role, CAM_REQUEUE_REQ, SEARCH_COMPLETE);
 
         /*
          * Clean out the busy target table for any untagged commands.
          */
         i = 0;
         maxtarget = 16;
         if (target != CAM_TARGET_WILDCARD) {
                 i = target;
                 if (channel == 'B')
                         i += 8;
                 maxtarget = i + 1;
         }
 
         if (lun == CAM_LUN_WILDCARD) {
                 minlun = 0;
                 maxlun = AHD_NUM_LUNS_NONPKT;
         } else if (lun >= AHD_NUM_LUNS_NONPKT) {
                 minlun = maxlun = 0;
         } else {
                 minlun = lun;
                 maxlun = lun + 1;
         }
 
         if (role != ROLE_TARGET) {
                 for (;i < maxtarget; i++) {
                         for (j = minlun;j < maxlun; j++) {
                                 u_int scbid;
                                 u_int tcl;
 
                                 tcl = BUILD_TCL_RAW(i, 'A', j);
                                 scbid = ahd_find_busy_tcl(ahd, tcl);
                                 scbp = ahd_lookup_scb(ahd, scbid);
                                 if (scbp == NULL
                                  || ahd_match_scb(ahd, scbp, target, channel,
                                                   lun, tag, role) == 0)
                                         continue;
                                 ahd_unbusy_tcl(ahd, BUILD_TCL_RAW(i, 'A', j));
                         }
                 }
         }
 
         /*
          * Don't abort commands that have already completed,
          * but haven't quite made it up to the host yet.
          */
         ahd_flush_qoutfifo(ahd);
 
         /*
          * Go through the pending CCB list and look for
          * commands for this target that are still active.
          * These are other tagged commands that were
          * disconnected when the reset occurred.
          */
         scbp_next = LIST_FIRST(&ahd->pending_scbs);
         while (scbp_next != NULL) {
                 scbp = scbp_next;
                 scbp_next = LIST_NEXT(scbp, pending_links);
                 if (ahd_match_scb(ahd, scbp, target, channel, lun, tag, role)) {
                         cam_status ostat;
 
                         ostat = ahd_get_transaction_status(scbp);
                         if (ostat == CAM_REQ_INPROG)
                                 ahd_set_transaction_status(scbp, status);
                         if (ahd_get_transaction_status(scbp) != CAM_REQ_CMP)
                                 ahd_freeze_scb(scbp);
                         if ((scbp->flags & SCB_ACTIVE) == 0)
                                 printf("Inactive SCB on pending list\n");
                         ahd_done(ahd, scbp);
                         found++;
                 }
         }
         ahd_restore_modes(ahd, saved_modes);
         ahd_platform_abort_scbs(ahd, target, channel, lun, tag, role, status);
         ahd->flags |= AHD_UPDATE_PEND_CMDS;
         return found;
 }
 
 static void
 ahd_reset_current_bus(struct ahd_softc *ahd)
 {
         uint8_t scsiseq;
 
         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
         ahd_outb(ahd, SIMODE1, ahd_inb(ahd, SIMODE1) & ~ENSCSIRST);
         scsiseq = ahd_inb(ahd, SCSISEQ0) & ~(ENSELO|ENARBO|SCSIRSTO);
         ahd_outb(ahd, SCSISEQ0, scsiseq | SCSIRSTO);
         ahd_flush_device_writes(ahd);
         ahd_delay(AHD_BUSRESET_DELAY);
         /* Turn off the bus reset */
         ahd_outb(ahd, SCSISEQ0, scsiseq);
         ahd_flush_device_writes(ahd);
         ahd_delay(AHD_BUSRESET_DELAY);
         if ((ahd->bugs & AHD_SCSIRST_BUG) != 0) {
                 /*
                  * 2A Razor #474
                  * Certain chip state is not cleared for
                  * SCSI bus resets that we initiate, so
                  * we must reset the chip.
                  */
                 ahd_reset(ahd, /*reinit*/TRUE);
                 ahd_intr_enable(ahd, /*enable*/TRUE);
                 AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
         }
 
         ahd_clear_intstat(ahd);
 }
 
 int
 ahd_reset_channel(struct ahd_softc *ahd, char channel, int initiate_reset)
 {
         struct        ahd_devinfo caminfo;
         u_int        initiator;
         u_int        target;
         u_int        max_scsiid;
         int        found;
         u_int        fifo;
         u_int        next_fifo;
         uint8_t scsiseq;
 
         /*
          * Check if the last bus reset is cleared
          */
         if (ahd->flags & AHD_BUS_RESET_ACTIVE) {
                 printf("%s: bus reset still active\n",
                        ahd_name(ahd));
                 return 0;
         }
         ahd->flags |= AHD_BUS_RESET_ACTIVE;
 
         ahd->pending_device = NULL;
 
         ahd_compile_devinfo(&caminfo,
                             CAM_TARGET_WILDCARD,
                             CAM_TARGET_WILDCARD,
                             CAM_LUN_WILDCARD,
                             channel, ROLE_UNKNOWN);
         ahd_pause(ahd);
 
         /* Make sure the sequencer is in a safe location. */
         ahd_clear_critical_section(ahd);
 
         /*
          * Run our command complete fifos to ensure that we perform
          * completion processing on any commands that 'completed'
          * before the reset occurred.
          */
         ahd_run_qoutfifo(ahd);
 #ifdef AHD_TARGET_MODE
         if ((ahd->flags & AHD_TARGETROLE) != 0) {
                 ahd_run_tqinfifo(ahd, /*paused*/TRUE);
         }
 #endif
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 
         /*
          * Disable selections so no automatic hardware
          * functions will modify chip state.
          */
         ahd_outb(ahd, SCSISEQ0, 0);
         ahd_outb(ahd, SCSISEQ1, 0);
 
         /*
          * Safely shut down our DMA engines.  Always start with
          * the FIFO that is not currently active (if any are
          * actively connected).
          */
         next_fifo = fifo = ahd_inb(ahd, DFFSTAT) & CURRFIFO;
         if (next_fifo > CURRFIFO_1)
                 /* If disconneced, arbitrarily start with FIFO1. */
                 next_fifo = fifo = 0;
         do {
                 next_fifo ^= CURRFIFO_1;
                 ahd_set_modes(ahd, next_fifo, next_fifo);
                 ahd_outb(ahd, DFCNTRL,
                          ahd_inb(ahd, DFCNTRL) & ~(SCSIEN|HDMAEN));
                 while ((ahd_inb(ahd, DFCNTRL) & HDMAENACK) != 0)
                         ahd_delay(10);
                 /*
                  * Set CURRFIFO to the now inactive channel.
                  */
                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
                 ahd_outb(ahd, DFFSTAT, next_fifo);
         } while (next_fifo != fifo);
 
         /*
          * Reset the bus if we are initiating this reset
          */
         ahd_clear_msg_state(ahd);
         ahd_outb(ahd, SIMODE1,
                  ahd_inb(ahd, SIMODE1) & ~(ENBUSFREE|ENSCSIRST));
 
         if (initiate_reset)
                 ahd_reset_current_bus(ahd);
 
         ahd_clear_intstat(ahd);
 
         /*
          * Clean up all the state information for the
          * pending transactions on this bus.
          */
         found = ahd_abort_scbs(ahd, CAM_TARGET_WILDCARD, channel,
                                CAM_LUN_WILDCARD, SCB_LIST_NULL,
                                ROLE_UNKNOWN, CAM_SCSI_BUS_RESET);
 
         /*
          * Cleanup anything left in the FIFOs.
          */
         ahd_clear_fifo(ahd, 0);
         ahd_clear_fifo(ahd, 1);
 
         /*
          * Clear SCSI interrupt status
          */
         ahd_outb(ahd, CLRSINT1, CLRSCSIRSTI);
 
         /*
          * Reenable selections
          */
         ahd_outb(ahd, SIMODE1, ahd_inb(ahd, SIMODE1) | ENSCSIRST);
         scsiseq = ahd_inb(ahd, SCSISEQ_TEMPLATE);
         ahd_outb(ahd, SCSISEQ1, scsiseq & (ENSELI|ENRSELI|ENAUTOATNP));
 
         max_scsiid = (ahd->features & AHD_WIDE) ? 15 : 7;
 #ifdef AHD_TARGET_MODE
         /*
          * Send an immediate notify ccb to all target more peripheral
          * drivers affected by this action.
          */
         for (target = 0; target <= max_scsiid; target++) {
                 struct ahd_tmode_tstate* tstate;
                 u_int lun;
 
                 tstate = ahd->enabled_targets[target];
                 if (tstate == NULL)
                         continue;
                 for (lun = 0; lun < AHD_NUM_LUNS; lun++) {
                         struct ahd_tmode_lstate* lstate;
 
                         lstate = tstate->enabled_luns[lun];
                         if (lstate == NULL)
                                 continue;
 
                         ahd_queue_lstate_event(ahd, lstate, CAM_TARGET_WILDCARD,
                                                EVENT_TYPE_BUS_RESET, /*arg*/0);
                         ahd_send_lstate_events(ahd, lstate);
                 }
         }
 #endif
         /*
          * Revert to async/narrow transfers until we renegotiate.
          */
         for (target = 0; target <= max_scsiid; target++) {
 
                 if (ahd->enabled_targets[target] == NULL)
                         continue;
                 for (initiator = 0; initiator <= max_scsiid; initiator++) {
                         struct ahd_devinfo devinfo;
 
                         ahd_compile_devinfo(&devinfo, target, initiator,
                                             CAM_LUN_WILDCARD,
                                             'A', ROLE_UNKNOWN);
                         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                                       AHD_TRANS_CUR, /*paused*/TRUE);
                         ahd_set_syncrate(ahd, &devinfo, /*period*/0,
                                          /*offset*/0, /*ppr_options*/0,
                                          AHD_TRANS_CUR, /*paused*/TRUE);
                 }
         }
 
         /* Notify the XPT that a bus reset occurred */
         ahd_send_async(ahd, caminfo.channel, CAM_TARGET_WILDCARD,
                        CAM_LUN_WILDCARD, AC_BUS_RESET);
 
         ahd_restart(ahd);
 
         return (found);
 }
 
 /**************************** Statistics Processing ***************************/
 static void
 ahd_stat_timer(void *arg)
 {
         struct        ahd_softc *ahd = arg;
         u_long        s;
         int        enint_coal;
         
         ahd_lock(ahd, &s);
 
         enint_coal = ahd->hs_mailbox & ENINT_COALESCE;
         if (ahd->cmdcmplt_total > ahd->int_coalescing_threshold)
                 enint_coal |= ENINT_COALESCE;
         else if (ahd->cmdcmplt_total < ahd->int_coalescing_stop_threshold)
                 enint_coal &= ~ENINT_COALESCE;
 
         if (enint_coal != (ahd->hs_mailbox & ENINT_COALESCE)) {
                 ahd_enable_coalescing(ahd, enint_coal);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_INT_COALESCING) != 0)
                         printf("%s: Interrupt coalescing "
                                "now %sabled. Cmds %d\n",
                                ahd_name(ahd),
                                (enint_coal & ENINT_COALESCE) ? "en" : "dis",
                                ahd->cmdcmplt_total);
 #endif
         }
 
         ahd->cmdcmplt_bucket = (ahd->cmdcmplt_bucket+1) & (AHD_STAT_BUCKETS-1);
         ahd->cmdcmplt_total -= ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket];
         ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket] = 0;
         ahd_timer_reset(&ahd->stat_timer, AHD_STAT_UPDATE_US,
                         ahd_stat_timer, ahd);
         ahd_unlock(ahd, &s);
 }
 
 /****************************** Status Processing *****************************/
 
 static void
 ahd_handle_scsi_status(struct ahd_softc *ahd, struct scb *scb)
 {
         struct        hardware_scb *hscb;
         int        paused;
 
         /*
          * The sequencer freezes its select-out queue
          * anytime a SCSI status error occurs.  We must
          * handle the error and increment our qfreeze count
          * to allow the sequencer to continue.  We don't
          * bother clearing critical sections here since all
          * operations are on data structures that the sequencer
          * is not touching once the queue is frozen.
          */
         hscb = scb->hscb; 
 
         if (ahd_is_paused(ahd)) {
                 paused = 1;
         } else {
                 paused = 0;
                 ahd_pause(ahd);
         }
 
         /* Freeze the queue until the client sees the error. */
         ahd_freeze_devq(ahd, scb);
         ahd_freeze_scb(scb);
         ahd->qfreeze_cnt++;
         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, ahd->qfreeze_cnt);
 
         if (paused == 0)
                 ahd_unpause(ahd);
 
         /* Don't want to clobber the original sense code */
         if ((scb->flags & SCB_SENSE) != 0) {
                 /*
                  * Clear the SCB_SENSE Flag and perform
                  * a normal command completion.
                  */
                 scb->flags &= ~SCB_SENSE;
                 ahd_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
                 ahd_done(ahd, scb);
                 return;
         }
         ahd_set_transaction_status(scb, CAM_SCSI_STATUS_ERROR);
         ahd_set_scsi_status(scb, hscb->shared_data.istatus.scsi_status);
         switch (hscb->shared_data.istatus.scsi_status) {
         case STATUS_PKT_SENSE:
         {
                 struct scsi_status_iu_header *siu;
 
                 ahd_sync_sense(ahd, scb, BUS_DMASYNC_POSTREAD);
                 siu = (struct scsi_status_iu_header *)scb->sense_data;
                 ahd_set_scsi_status(scb, siu->status);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_SENSE) != 0) {
                         ahd_print_path(ahd, scb);
                         printf("SCB 0x%x Received PKT Status of 0x%x\n",
                                SCB_GET_TAG(scb), siu->status);
                         printf("\tflags = 0x%x, sense len = 0x%x, "
                                "pktfail = 0x%x\n",
                                siu->flags, scsi_4btoul(siu->sense_length),
                                scsi_4btoul(siu->pkt_failures_length));
                 }
 #endif
                 if ((siu->flags & SIU_RSPVALID) != 0) {
                         ahd_print_path(ahd, scb);
                         if (scsi_4btoul(siu->pkt_failures_length) < 4) {
                                 printf("Unable to parse pkt_failures\n");
                         } else {
 
                                 switch (SIU_PKTFAIL_CODE(siu)) {
                                 case SIU_PFC_NONE:
                                         printf("No packet failure found\n");
                                         break;
                                 case SIU_PFC_CIU_FIELDS_INVALID:
                                         printf("Invalid Command IU Field\n");
                                         break;
                                 case SIU_PFC_TMF_NOT_SUPPORTED:
                                         printf("TMF not supportd\n");
                                         break;
                                 case SIU_PFC_TMF_FAILED:
                                         printf("TMF failed\n");
                                         break;
                                 case SIU_PFC_INVALID_TYPE_CODE:
                                         printf("Invalid L_Q Type code\n");
                                         break;
                                 case SIU_PFC_ILLEGAL_REQUEST:
                                         printf("Illegal request\n");
                                 default:
                                         break;
                                 }
                         }
                         if (siu->status == SCSI_STATUS_OK)
                                 ahd_set_transaction_status(scb,
                                                            CAM_REQ_CMP_ERR);
                 }
                 if ((siu->flags & SIU_SNSVALID) != 0) {
                         scb->flags |= SCB_PKT_SENSE;
 #ifdef AHD_DEBUG
                         if ((ahd_debug & AHD_SHOW_SENSE) != 0)
                                 printf("Sense data available\n");
 #endif
                 }
                 ahd_done(ahd, scb);
                 break;
         }
         case SCSI_STATUS_CMD_TERMINATED:
         case SCSI_STATUS_CHECK_COND:
         {
                 struct ahd_devinfo devinfo;
                 struct ahd_dma_seg *sg;
                 struct scsi_sense *sc;
                 struct ahd_initiator_tinfo *targ_info;
                 struct ahd_tmode_tstate *tstate;
                 struct ahd_transinfo *tinfo;
 #ifdef AHD_DEBUG
                 if (ahd_debug & AHD_SHOW_SENSE) {
                         ahd_print_path(ahd, scb);
                         printf("SCB %d: requests Check Status\n",
                                SCB_GET_TAG(scb));
                 }
 #endif
 
                 if (ahd_perform_autosense(scb) == 0)
                         break;
 
                 ahd_compile_devinfo(&devinfo, SCB_GET_OUR_ID(scb),
                                     SCB_GET_TARGET(ahd, scb),
                                     SCB_GET_LUN(scb),
                                     SCB_GET_CHANNEL(ahd, scb),
                                     ROLE_INITIATOR);
                 targ_info = ahd_fetch_transinfo(ahd,
                                                 devinfo.channel,
                                                 devinfo.our_scsiid,
                                                 devinfo.target,
                                                 &tstate);
                 tinfo = &targ_info->curr;
                 sg = scb->sg_list;
                 sc = (struct scsi_sense *)hscb->shared_data.idata.cdb;
                 /*
                  * Save off the residual if there is one.
                  */
                 ahd_update_residual(ahd, scb);
 #ifdef AHD_DEBUG
                 if (ahd_debug & AHD_SHOW_SENSE) {
                         ahd_print_path(ahd, scb);
                         printf("Sending Sense\n");
                 }
 #endif
                 scb->sg_count = 0;
                 sg = ahd_sg_setup(ahd, scb, sg, ahd_get_sense_bufaddr(ahd, scb),
                                   ahd_get_sense_bufsize(ahd, scb),
                                   /*last*/TRUE);
                 sc->opcode = REQUEST_SENSE;
                 sc->byte2 = 0;
                 if (tinfo->protocol_version <= SCSI_REV_2
                  && SCB_GET_LUN(scb) < 8)
                         sc->byte2 = SCB_GET_LUN(scb) << 5;
                 sc->unused[0] = 0;
                 sc->unused[1] = 0;
                 sc->length = ahd_get_sense_bufsize(ahd, scb);
                 sc->control = 0;
 
                 /*
                  * We can't allow the target to disconnect.
                  * This will be an untagged transaction and
                  * having the target disconnect will make this
                  * transaction indestinguishable from outstanding
                  * tagged transactions.
                  */
                 hscb->control = 0;
 
                 /*
                  * This request sense could be because the
                  * the device lost power or in some other
                  * way has lost our transfer negotiations.
                  * Renegotiate if appropriate.  Unit attention
                  * errors will be reported before any data
                  * phases occur.
                  */
                 if (ahd_get_residual(scb) == ahd_get_transfer_length(scb)) {
                         ahd_update_neg_request(ahd, &devinfo,
                                                tstate, targ_info,
                                                AHD_NEG_IF_NON_ASYNC);
                 }
                 if (tstate->auto_negotiate & devinfo.target_mask) {
                         hscb->control |= MK_MESSAGE;
                         scb->flags &=
                             ~(SCB_NEGOTIATE|SCB_ABORT|SCB_DEVICE_RESET);
                         scb->flags |= SCB_AUTO_NEGOTIATE;
                 }
                 hscb->cdb_len = sizeof(*sc);
                 ahd_setup_data_scb(ahd, scb);
                 scb->flags |= SCB_SENSE;
                 ahd_queue_scb(ahd, scb);
                 break;
         }
         case SCSI_STATUS_OK:
                 printf("%s: Interrupted for staus of 0???\n",
                        ahd_name(ahd));
                 /* FALLTHROUGH */
         default:
                 ahd_done(ahd, scb);
                 break;
         }
 }
 
 static void
 ahd_handle_scb_status(struct ahd_softc *ahd, struct scb *scb)
 {
         if (scb->hscb->shared_data.istatus.scsi_status != 0) {
                 ahd_handle_scsi_status(ahd, scb);
         } else {
                 ahd_calc_residual(ahd, scb);
                 ahd_done(ahd, scb);
         }
 }
 
 /*
  * Calculate the residual for a just completed SCB.
  */
 static void
 ahd_calc_residual(struct ahd_softc *ahd, struct scb *scb)
 {
         struct hardware_scb *hscb;
         struct initiator_status *spkt;
         uint32_t sgptr;
         uint32_t resid_sgptr;
         uint32_t resid;
 
         /*
          * 5 cases.
          * 1) No residual.
          *    SG_STATUS_VALID clear in sgptr.
          * 2) Transferless command
          * 3) Never performed any transfers.
          *    sgptr has SG_FULL_RESID set.
          * 4) No residual but target did not
          *    save data pointers after the
          *    last transfer, so sgptr was
          *    never updated.
          * 5) We have a partial residual.
          *    Use residual_sgptr to determine
          *    where we are.
          */
 
         hscb = scb->hscb;
         sgptr = ahd_le32toh(hscb->sgptr);
         if ((sgptr & SG_STATUS_VALID) == 0)
                 /* Case 1 */
                 return;
         sgptr &= ~SG_STATUS_VALID;
 
         if ((sgptr & SG_LIST_NULL) != 0)
                 /* Case 2 */
                 return;
 
         /*
          * Residual fields are the same in both
          * target and initiator status packets,
          * so we can always use the initiator fields
          * regardless of the role for this SCB.
          */
         spkt = &hscb->shared_data.istatus;
         resid_sgptr = ahd_le32toh(spkt->residual_sgptr);
         if ((sgptr & SG_FULL_RESID) != 0) {
                 /* Case 3 */
                 resid = ahd_get_transfer_length(scb);
         } else if ((resid_sgptr & SG_LIST_NULL) != 0) {
                 /* Case 4 */
                 return;
         } else if ((resid_sgptr & SG_OVERRUN_RESID) != 0) {
                 ahd_print_path(ahd, scb);
                 printf("data overrun detected Tag == 0x%x.\n",
                        SCB_GET_TAG(scb));
                 ahd_freeze_devq(ahd, scb);
                 ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
                 ahd_freeze_scb(scb);
                 return;
         } else if ((resid_sgptr & ~SG_PTR_MASK) != 0) {
                 panic("Bogus resid sgptr value 0x%x\n", resid_sgptr);
                 /* NOTREACHED */
         } else {
                 struct ahd_dma_seg *sg;
 
                 /*
                  * Remainder of the SG where the transfer
                  * stopped.  
                  */
                 resid = ahd_le32toh(spkt->residual_datacnt) & AHD_SG_LEN_MASK;
                 sg = ahd_sg_bus_to_virt(ahd, scb, resid_sgptr & SG_PTR_MASK);
 
                 /* The residual sg_ptr always points to the next sg */
                 sg--;
 
                 /*
                  * Add up the contents of all residual
                  * SG segments that are after the SG where
                  * the transfer stopped.
                  */
                 while ((ahd_le32toh(sg->len) & AHD_DMA_LAST_SEG) == 0) {
                         sg++;
                         resid += ahd_le32toh(sg->len) & AHD_SG_LEN_MASK;
                 }
         }
         if ((scb->flags & SCB_SENSE) == 0)
                 ahd_set_residual(scb, resid);
         else
                 ahd_set_sense_residual(scb, resid);
 
 #ifdef AHD_DEBUG
         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
                 ahd_print_path(ahd, scb);
                 printf("Handled %sResidual of %d bytes\n",
                        (scb->flags & SCB_SENSE) ? "Sense " : "", resid);
         }
 #endif
 }
 
 /******************************* Target Mode **********************************/
 #ifdef AHD_TARGET_MODE
 /*
  * Add a target mode event to this lun's queue
  */
 static void
 ahd_queue_lstate_event(struct ahd_softc *ahd, struct ahd_tmode_lstate *lstate,
                        u_int initiator_id, u_int event_type, u_int event_arg)
 {
         struct ahd_tmode_event *event;
         int pending;
 
         xpt_freeze_devq(lstate->path, /*count*/1);
         if (lstate->event_w_idx >= lstate->event_r_idx)
                 pending = lstate->event_w_idx - lstate->event_r_idx;
         else
                 pending = AHD_TMODE_EVENT_BUFFER_SIZE + 1
                         - (lstate->event_r_idx - lstate->event_w_idx);
 
         if (event_type == EVENT_TYPE_BUS_RESET
          || event_type == MSG_BUS_DEV_RESET) {
                 /*
                  * Any earlier events are irrelevant, so reset our buffer.
                  * This has the effect of allowing us to deal with reset
                  * floods (an external device holding down the reset line)
                  * without losing the event that is really interesting.
                  */
                 lstate->event_r_idx = 0;
                 lstate->event_w_idx = 0;
                 xpt_release_devq(lstate->path, pending, /*runqueue*/FALSE);
         }
 
         if (pending == AHD_TMODE_EVENT_BUFFER_SIZE) {
                 xpt_print_path(lstate->path);
                 printf("immediate event %x:%x lost\n",
                        lstate->event_buffer[lstate->event_r_idx].event_type,
                        lstate->event_buffer[lstate->event_r_idx].event_arg);
                 lstate->event_r_idx++;
                 if (lstate->event_r_idx == AHD_TMODE_EVENT_BUFFER_SIZE)
                         lstate->event_r_idx = 0;
                 xpt_release_devq(lstate->path, /*count*/1, /*runqueue*/FALSE);
         }
 
         event = &lstate->event_buffer[lstate->event_w_idx];
         event->initiator_id = initiator_id;
         event->event_type = event_type;
         event->event_arg = event_arg;
         lstate->event_w_idx++;
         if (lstate->event_w_idx == AHD_TMODE_EVENT_BUFFER_SIZE)
                 lstate->event_w_idx = 0;
 }
 
 /*
  * Send any target mode events queued up waiting
  * for immediate notify resources.
  */
 void
 ahd_send_lstate_events(struct ahd_softc *ahd, struct ahd_tmode_lstate *lstate)
 {
         struct ccb_hdr *ccbh;
         struct ccb_immed_notify *inot;
 
         while (lstate->event_r_idx != lstate->event_w_idx
             && (ccbh = SLIST_FIRST(&lstate->immed_notifies)) != NULL) {
                 struct ahd_tmode_event *event;
 
                 event = &lstate->event_buffer[lstate->event_r_idx];
                 SLIST_REMOVE_HEAD(&lstate->immed_notifies, sim_links.sle);
                 inot = (struct ccb_immed_notify *)ccbh;
                 switch (event->event_type) {
                 case EVENT_TYPE_BUS_RESET:
                         ccbh->status = CAM_SCSI_BUS_RESET|CAM_DEV_QFRZN;
                         break;
                 default:
                         ccbh->status = CAM_MESSAGE_RECV|CAM_DEV_QFRZN;
                         inot->message_args[0] = event->event_type;
                         inot->message_args[1] = event->event_arg;
                         break;
                 }
                 inot->initiator_id = event->initiator_id;
                 inot->sense_len = 0;
                 xpt_done((union ccb *)inot);
                 lstate->event_r_idx++;
                 if (lstate->event_r_idx == AHD_TMODE_EVENT_BUFFER_SIZE)
                         lstate->event_r_idx = 0;
         }
 }
 #endif
 
 /******************** Sequencer Program Patching/Download *********************/
 
 #ifdef AHD_DUMP_SEQ
 void
 ahd_dumpseq(struct ahd_softc* ahd)
 {
         int i;
         int max_prog;
 
         max_prog = 2048;
 
         ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
         ahd_outw(ahd, PRGMCNT, 0);
         for (i = 0; i < max_prog; i++) {
                 uint8_t ins_bytes[4];
 
                 ahd_insb(ahd, SEQRAM, ins_bytes, 4);
                 printf("0x%08x\n", ins_bytes[0] << 24
                                  | ins_bytes[1] << 16
                                  | ins_bytes[2] << 8
                                  | ins_bytes[3]);
         }
 }
 #endif
 
 static void
 ahd_loadseq(struct ahd_softc *ahd)
 {
         struct        cs cs_table[num_critical_sections];
         u_int        begin_set[num_critical_sections];
         u_int        end_set[num_critical_sections];
         const struct patch *cur_patch;
         u_int        cs_count;
         u_int        cur_cs;
         u_int        i;
         int        downloaded;
         u_int        skip_addr;
         u_int        sg_prefetch_cnt;
         u_int        sg_prefetch_cnt_limit;
         u_int        sg_prefetch_align;
         u_int        sg_size;
         u_int        cacheline_mask;
         uint8_t        download_consts[DOWNLOAD_CONST_COUNT];
 
         if (bootverbose)
                 printf("%s: Downloading Sequencer Program...",
                        ahd_name(ahd));
 
 #if DOWNLOAD_CONST_COUNT != 8
 #error "Download Const Mismatch"
 #endif
         /*
          * Start out with 0 critical sections
          * that apply to this firmware load.
          */
         cs_count = 0;
         cur_cs = 0;
         memset(begin_set, 0, sizeof(begin_set));
         memset(end_set, 0, sizeof(end_set));
 
         /*
          * Setup downloadable constant table.
          * 
          * The computation for the S/G prefetch variables is
          * a bit complicated.  We would like to always fetch
          * in terms of cachelined sized increments.  However,
          * if the cacheline is not an even multiple of the
          * SG element size or is larger than our SG RAM, using
          * just the cache size might leave us with only a portion
          * of an SG element at the tail of a prefetch.  If the
          * cacheline is larger than our S/G prefetch buffer less
          * the size of an SG element, we may round down to a cacheline
          * that doesn't contain any or all of the S/G of interest
          * within the bounds of our S/G ram.  Provide variables to
          * the sequencer that will allow it to handle these edge
          * cases.
          */
         /* Start by aligning to the nearest cacheline. */
         sg_prefetch_align = ahd->pci_cachesize;
         if (sg_prefetch_align == 0)
                 sg_prefetch_align = 8;
         /* Round down to the nearest power of 2. */
         while (powerof2(sg_prefetch_align) == 0)
                 sg_prefetch_align--;
 
         cacheline_mask = sg_prefetch_align - 1;
 
         /*
          * If the cacheline boundary is greater than half our prefetch RAM
          * we risk not being able to fetch even a single complete S/G
          * segment if we align to that boundary.
          */
         if (sg_prefetch_align > CCSGADDR_MAX/2)
                 sg_prefetch_align = CCSGADDR_MAX/2;
         /* Start by fetching a single cacheline. */
         sg_prefetch_cnt = sg_prefetch_align;
         /*
          * Increment the prefetch count by cachelines until
          * at least one S/G element will fit.
          */
         sg_size = sizeof(struct ahd_dma_seg);
         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
                 sg_size = sizeof(struct ahd_dma64_seg);
         while (sg_prefetch_cnt < sg_size)
                 sg_prefetch_cnt += sg_prefetch_align;
         /*
          * If the cacheline is not an even multiple of
          * the S/G size, we may only get a partial S/G when
          * we align. Add a cacheline if this is the case.
          */
         if ((sg_prefetch_align % sg_size) != 0
          && (sg_prefetch_cnt < CCSGADDR_MAX))
                 sg_prefetch_cnt += sg_prefetch_align;
         /*
          * Lastly, compute a value that the sequencer can use
          * to determine if the remainder of the CCSGRAM buffer
          * has a full S/G element in it.
          */
         sg_prefetch_cnt_limit = -(sg_prefetch_cnt - sg_size + 1);
         download_consts[SG_PREFETCH_CNT] = sg_prefetch_cnt;
         download_consts[SG_PREFETCH_CNT_LIMIT] = sg_prefetch_cnt_limit;
         download_consts[SG_PREFETCH_ALIGN_MASK] = ~(sg_prefetch_align - 1);
         download_consts[SG_PREFETCH_ADDR_MASK] = (sg_prefetch_align - 1);
         download_consts[SG_SIZEOF] = sg_size;
         download_consts[PKT_OVERRUN_BUFOFFSET] =
                 (ahd->overrun_buf - (uint8_t *)ahd->qoutfifo) / 256;
         download_consts[SCB_TRANSFER_SIZE] = SCB_TRANSFER_SIZE_1BYTE_LUN;
         download_consts[CACHELINE_MASK] = cacheline_mask;
         cur_patch = patches;
         downloaded = 0;
         skip_addr = 0;
         ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
         ahd_outw(ahd, PRGMCNT, 0);
 
         for (i = 0; i < sizeof(seqprog)/4; i++) {
                 if (ahd_check_patch(ahd, &cur_patch, i, &skip_addr) == 0) {
                         /*
                          * Don't download this instruction as it
                          * is in a patch that was removed.
                          */
                         continue;
                 }
                 /*
                  * Move through the CS table until we find a CS
                  * that might apply to this instruction.
                  */
                 for (; cur_cs < num_critical_sections; cur_cs++) {
                         if (critical_sections[cur_cs].end <= i) {
                                 if (begin_set[cs_count] == TRUE
                                  && end_set[cs_count] == FALSE) {
                                         cs_table[cs_count].end = downloaded;
                                          end_set[cs_count] = TRUE;
                                         cs_count++;
                                 }
                                 continue;
                         }
                         if (critical_sections[cur_cs].begin <= i
                          && begin_set[cs_count] == FALSE) {
                                 cs_table[cs_count].begin = downloaded;
                                 begin_set[cs_count] = TRUE;
                         }
                         break;
                 }
                 ahd_download_instr(ahd, i, download_consts);
                 downloaded++;
         }
 
         ahd->num_critical_sections = cs_count;
         if (cs_count != 0) {
 
                 cs_count *= sizeof(struct cs);
                 ahd->critical_sections = malloc(cs_count, M_DEVBUF, M_NOWAIT);
                 if (ahd->critical_sections == NULL)
                         panic("ahd_loadseq: Could not malloc");
                 memcpy(ahd->critical_sections, cs_table, cs_count);
         }
         ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS|FASTMODE);
 
         if (bootverbose) {
                 printf(" %d instructions downloaded\n", downloaded);
                 printf("%s: Features 0x%x, Bugs 0x%x, Flags 0x%x\n",
                        ahd_name(ahd), ahd->features, ahd->bugs, ahd->flags);
         }
 }
 
 static int
 ahd_check_patch(struct ahd_softc *ahd, const struct patch **start_patch,
                 u_int start_instr, u_int *skip_addr)
 {
         const struct patch *cur_patch;
         const struct patch *last_patch;
         u_int        num_patches;
 
         num_patches = ARRAY_SIZE(patches);
         last_patch = &patches[num_patches];
         cur_patch = *start_patch;
 
         while (cur_patch < last_patch && start_instr == cur_patch->begin) {
 
                 if (cur_patch->patch_func(ahd) == 0) {
 
                         /* Start rejecting code */
                         *skip_addr = start_instr + cur_patch->skip_instr;
                         cur_patch += cur_patch->skip_patch;
                 } else {
                         /* Accepted this patch.  Advance to the next
                          * one and wait for our intruction pointer to
                          * hit this point.
                          */
                         cur_patch++;
                 }
         }
 
         *start_patch = cur_patch;
         if (start_instr < *skip_addr)
                 /* Still skipping */
                 return (0);
 
         return (1);
 }
 
 static u_int
 ahd_resolve_seqaddr(struct ahd_softc *ahd, u_int address)
 {
         const struct patch *cur_patch;
         int address_offset;
         u_int skip_addr;
         u_int i;
 
         address_offset = 0;
         cur_patch = patches;
         skip_addr = 0;
 
         for (i = 0; i < address;) {
 
                 ahd_check_patch(ahd, &cur_patch, i, &skip_addr);
 
                 if (skip_addr > i) {
                         int end_addr;
 
                         end_addr = min(address, skip_addr);
                         address_offset += end_addr - i;
                         i = skip_addr;
                 } else {
                         i++;
                 }
         }
         return (address - address_offset);
 }
 
 static void
 ahd_download_instr(struct ahd_softc *ahd, u_int instrptr, uint8_t *dconsts)
 {
         union        ins_formats instr;
         struct        ins_format1 *fmt1_ins;
         struct        ins_format3 *fmt3_ins;
         u_int        opcode;
 
         /*
          * The firmware is always compiled into a little endian format.
          */
         instr.integer = ahd_le32toh(*(uint32_t*)&seqprog[instrptr * 4]);
 
         fmt1_ins = &instr.format1;
         fmt3_ins = NULL;
 
         /* Pull the opcode */
         opcode = instr.format1.opcode;
         switch (opcode) {
         case AIC_OP_JMP:
         case AIC_OP_JC:
         case AIC_OP_JNC:
         case AIC_OP_CALL:
         case AIC_OP_JNE:
         case AIC_OP_JNZ:
         case AIC_OP_JE:
         case AIC_OP_JZ:
         {
                 fmt3_ins = &instr.format3;
                 fmt3_ins->address = ahd_resolve_seqaddr(ahd, fmt3_ins->address);
                 /* FALLTHROUGH */
         }
         case AIC_OP_OR:
         case AIC_OP_AND:
         case AIC_OP_XOR:
         case AIC_OP_ADD:
         case AIC_OP_ADC:
         case AIC_OP_BMOV:
                 if (fmt1_ins->parity != 0) {
                         fmt1_ins->immediate = dconsts[fmt1_ins->immediate];
                 }
                 fmt1_ins->parity = 0;
                 /* FALLTHROUGH */
         case AIC_OP_ROL:
         {
                 int i, count;
 
                 /* Calculate odd parity for the instruction */
                 for (i = 0, count = 0; i < 31; i++) {
                         uint32_t mask;
 
                         mask = 0x01 << i;
                         if ((instr.integer & mask) != 0)
                                 count++;
                 }
                 if ((count & 0x01) == 0)
                         instr.format1.parity = 1;
 
                 /* The sequencer is a little endian cpu */
                 instr.integer = ahd_htole32(instr.integer);
                 ahd_outsb(ahd, SEQRAM, instr.bytes, 4);
                 break;
         }
         default:
                 panic("Unknown opcode encountered in seq program");
                 break;
         }
 }
 
 static int
 ahd_probe_stack_size(struct ahd_softc *ahd)
 {
         int last_probe;
 
         last_probe = 0;
         while (1) {
                 int i;
 
                 /*
                  * We avoid using 0 as a pattern to avoid
                  * confusion if the stack implementation
                  * "back-fills" with zeros when "poping'
                  * entries.
                  */
                 for (i = 1; i <= last_probe+1; i++) {
                        ahd_outb(ahd, STACK, i & 0xFF);
                        ahd_outb(ahd, STACK, (i >> 8) & 0xFF);
                 }
 
                 /* Verify */
                 for (i = last_probe+1; i > 0; i--) {
                         u_int stack_entry;
 
                         stack_entry = ahd_inb(ahd, STACK)
                                     |(ahd_inb(ahd, STACK) << 8);
                         if (stack_entry != i)
                                 goto sized;
                 }
                 last_probe++;
         }
 sized:
         return (last_probe);
 }
 
 int
 ahd_print_register(const ahd_reg_parse_entry_t *table, u_int num_entries,
                    const char *name, u_int address, u_int value,
                    u_int *cur_column, u_int wrap_point)
 {
         int        printed;
         u_int        printed_mask;
 
         if (cur_column != NULL && *cur_column >= wrap_point) {
                 printf("\n");
                 *cur_column = 0;
         }
         printed = printf("%s[0x%x]", name, value);
         if (table == NULL) {
                 printed += printf(" ");
                 *cur_column += printed;
                 return (printed);
         }
         printed_mask = 0;
         while (printed_mask != 0xFF) {
                 int entry;
 
                 for (entry = 0; entry < num_entries; entry++) {
                         if (((value & table[entry].mask)
                           != table[entry].value)
                          || ((printed_mask & table[entry].mask)
                           == table[entry].mask))
                                 continue;
 
                         printed += printf("%s%s",
                                           printed_mask == 0 ? ":(" : "|",
                                           table[entry].name);
                         printed_mask |= table[entry].mask;
                         
                         break;
                 }
                 if (entry >= num_entries)
                         break;
         }
         if (printed_mask != 0)
                 printed += printf(") ");
         else
                 printed += printf(" ");
         if (cur_column != NULL)
                 *cur_column += printed;
         return (printed);
 }
 
 void
 ahd_dump_card_state(struct ahd_softc *ahd)
 {
         struct scb        *scb;
         ahd_mode_state         saved_modes;
         u_int                 dffstat;
         int                 paused;
         u_int                 scb_index;
         u_int                 saved_scb_index;
         u_int                 cur_col;
         int                 i;
 
         if (ahd_is_paused(ahd)) {
                 paused = 1;
         } else {
                 paused = 0;
                 ahd_pause(ahd);
         }
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         printf(">>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<\n"
                "%s: Dumping Card State at program address 0x%x Mode 0x%x\n",
                ahd_name(ahd), 
                ahd_inw(ahd, CURADDR),
                ahd_build_mode_state(ahd, ahd->saved_src_mode,
                                     ahd->saved_dst_mode));
         if (paused)
                 printf("Card was paused\n");
 
         if (ahd_check_cmdcmpltqueues(ahd))
                 printf("Completions are pending\n");
 
         /*
          * Mode independent registers.
          */
         cur_col = 0;
         ahd_intstat_print(ahd_inb(ahd, INTSTAT), &cur_col, 50);
         ahd_seloid_print(ahd_inb(ahd, SELOID), &cur_col, 50);
         ahd_selid_print(ahd_inb(ahd, SELID), &cur_col, 50);
         ahd_hs_mailbox_print(ahd_inb(ahd, LOCAL_HS_MAILBOX), &cur_col, 50);
         ahd_intctl_print(ahd_inb(ahd, INTCTL), &cur_col, 50);
         ahd_seqintstat_print(ahd_inb(ahd, SEQINTSTAT), &cur_col, 50);
         ahd_saved_mode_print(ahd_inb(ahd, SAVED_MODE), &cur_col, 50);
         ahd_dffstat_print(ahd_inb(ahd, DFFSTAT), &cur_col, 50);
         ahd_scsisigi_print(ahd_inb(ahd, SCSISIGI), &cur_col, 50);
         ahd_scsiphase_print(ahd_inb(ahd, SCSIPHASE), &cur_col, 50);
         ahd_scsibus_print(ahd_inb(ahd, SCSIBUS), &cur_col, 50);
         ahd_lastphase_print(ahd_inb(ahd, LASTPHASE), &cur_col, 50);
         ahd_scsiseq0_print(ahd_inb(ahd, SCSISEQ0), &cur_col, 50);
         ahd_scsiseq1_print(ahd_inb(ahd, SCSISEQ1), &cur_col, 50);
         ahd_seqctl0_print(ahd_inb(ahd, SEQCTL0), &cur_col, 50);
         ahd_seqintctl_print(ahd_inb(ahd, SEQINTCTL), &cur_col, 50);
         ahd_seq_flags_print(ahd_inb(ahd, SEQ_FLAGS), &cur_col, 50);
         ahd_seq_flags2_print(ahd_inb(ahd, SEQ_FLAGS2), &cur_col, 50);
         ahd_qfreeze_count_print(ahd_inw(ahd, QFREEZE_COUNT), &cur_col, 50);
         ahd_kernel_qfreeze_count_print(ahd_inw(ahd, KERNEL_QFREEZE_COUNT),
                                        &cur_col, 50);
         ahd_mk_message_scb_print(ahd_inw(ahd, MK_MESSAGE_SCB), &cur_col, 50);
         ahd_mk_message_scsiid_print(ahd_inb(ahd, MK_MESSAGE_SCSIID),
                                     &cur_col, 50);
         ahd_sstat0_print(ahd_inb(ahd, SSTAT0), &cur_col, 50);
         ahd_sstat1_print(ahd_inb(ahd, SSTAT1), &cur_col, 50);
         ahd_sstat2_print(ahd_inb(ahd, SSTAT2), &cur_col, 50);
         ahd_sstat3_print(ahd_inb(ahd, SSTAT3), &cur_col, 50);
         ahd_perrdiag_print(ahd_inb(ahd, PERRDIAG), &cur_col, 50);
         ahd_simode1_print(ahd_inb(ahd, SIMODE1), &cur_col, 50);
         ahd_lqistat0_print(ahd_inb(ahd, LQISTAT0), &cur_col, 50);
         ahd_lqistat1_print(ahd_inb(ahd, LQISTAT1), &cur_col, 50);
         ahd_lqistat2_print(ahd_inb(ahd, LQISTAT2), &cur_col, 50);
         ahd_lqostat0_print(ahd_inb(ahd, LQOSTAT0), &cur_col, 50);
         ahd_lqostat1_print(ahd_inb(ahd, LQOSTAT1), &cur_col, 50);
         ahd_lqostat2_print(ahd_inb(ahd, LQOSTAT2), &cur_col, 50);
         printf("\n");
         printf("\nSCB Count = %d CMDS_PENDING = %d LASTSCB 0x%x "
                "CURRSCB 0x%x NEXTSCB 0x%x\n",
                ahd->scb_data.numscbs, ahd_inw(ahd, CMDS_PENDING),
                ahd_inw(ahd, LASTSCB), ahd_inw(ahd, CURRSCB),
                ahd_inw(ahd, NEXTSCB));
         cur_col = 0;
         /* QINFIFO */
         ahd_search_qinfifo(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
                            CAM_LUN_WILDCARD, SCB_LIST_NULL,
                            ROLE_UNKNOWN, /*status*/0, SEARCH_PRINT);
         saved_scb_index = ahd_get_scbptr(ahd);
         printf("Pending list:");
         i = 0;
         LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
                 if (i++ > AHD_SCB_MAX)
                         break;
                 cur_col = printf("\n%3d FIFO_USE[0x%x] ", SCB_GET_TAG(scb),
                                  ahd_inb_scbram(ahd, SCB_FIFO_USE_COUNT));
                 ahd_set_scbptr(ahd, SCB_GET_TAG(scb));
                 ahd_scb_control_print(ahd_inb_scbram(ahd, SCB_CONTROL),
                                       &cur_col, 60);
                 ahd_scb_scsiid_print(ahd_inb_scbram(ahd, SCB_SCSIID),
                                      &cur_col, 60);
         }
         printf("\nTotal %d\n", i);
 
         printf("Kernel Free SCB list: ");
         i = 0;
         TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
                 struct scb *list_scb;
 
                 list_scb = scb;
                 do {
                         printf("%d ", SCB_GET_TAG(list_scb));
                         list_scb = LIST_NEXT(list_scb, collision_links);
                 } while (list_scb && i++ < AHD_SCB_MAX);
         }
 
         LIST_FOREACH(scb, &ahd->scb_data.any_dev_free_scb_list, links.le) {
                 if (i++ > AHD_SCB_MAX)
                         break;
                 printf("%d ", SCB_GET_TAG(scb));
         }
         printf("\n");
 
         printf("Sequencer Complete DMA-inprog list: ");
         scb_index = ahd_inw(ahd, COMPLETE_SCB_DMAINPROG_HEAD);
         i = 0;
         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
                 ahd_set_scbptr(ahd, scb_index);
                 printf("%d ", scb_index);
                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
         }
         printf("\n");
 
         printf("Sequencer Complete list: ");
         scb_index = ahd_inw(ahd, COMPLETE_SCB_HEAD);
         i = 0;
         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
                 ahd_set_scbptr(ahd, scb_index);
                 printf("%d ", scb_index);
                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
         }
         printf("\n");
 
         
         printf("Sequencer DMA-Up and Complete list: ");
         scb_index = ahd_inw(ahd, COMPLETE_DMA_SCB_HEAD);
         i = 0;
         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
                 ahd_set_scbptr(ahd, scb_index);
                 printf("%d ", scb_index);
                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
         }
         printf("\n");
         printf("Sequencer On QFreeze and Complete list: ");
         scb_index = ahd_inw(ahd, COMPLETE_ON_QFREEZE_HEAD);
         i = 0;
         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
                 ahd_set_scbptr(ahd, scb_index);
                 printf("%d ", scb_index);
                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
         }
         printf("\n");
         ahd_set_scbptr(ahd, saved_scb_index);
         dffstat = ahd_inb(ahd, DFFSTAT);
         for (i = 0; i < 2; i++) {
 #ifdef AHD_DEBUG
                 struct scb *fifo_scb;
 #endif
                 u_int            fifo_scbptr;
 
                 ahd_set_modes(ahd, AHD_MODE_DFF0 + i, AHD_MODE_DFF0 + i);
                 fifo_scbptr = ahd_get_scbptr(ahd);
                 printf("\n\n%s: FIFO%d %s, LONGJMP == 0x%x, SCB 0x%x\n",
                        ahd_name(ahd), i,
                        (dffstat & (FIFO0FREE << i)) ? "Free" : "Active",
                        ahd_inw(ahd, LONGJMP_ADDR), fifo_scbptr);
                 cur_col = 0;
                 ahd_seqimode_print(ahd_inb(ahd, SEQIMODE), &cur_col, 50);
                 ahd_seqintsrc_print(ahd_inb(ahd, SEQINTSRC), &cur_col, 50);
                 ahd_dfcntrl_print(ahd_inb(ahd, DFCNTRL), &cur_col, 50);
                 ahd_dfstatus_print(ahd_inb(ahd, DFSTATUS), &cur_col, 50);
                 ahd_sg_cache_shadow_print(ahd_inb(ahd, SG_CACHE_SHADOW),
                                           &cur_col, 50);
                 ahd_sg_state_print(ahd_inb(ahd, SG_STATE), &cur_col, 50);
                 ahd_dffsxfrctl_print(ahd_inb(ahd, DFFSXFRCTL), &cur_col, 50);
                 ahd_soffcnt_print(ahd_inb(ahd, SOFFCNT), &cur_col, 50);
                 ahd_mdffstat_print(ahd_inb(ahd, MDFFSTAT), &cur_col, 50);
                 if (cur_col > 50) {
                         printf("\n");
                         cur_col = 0;
                 }
                 cur_col += printf("SHADDR = 0x%x%x, SHCNT = 0x%x ",
                                   ahd_inl(ahd, SHADDR+4),
                                   ahd_inl(ahd, SHADDR),
                                   (ahd_inb(ahd, SHCNT)
                                 | (ahd_inb(ahd, SHCNT + 1) << 8)
                                 | (ahd_inb(ahd, SHCNT + 2) << 16)));
                 if (cur_col > 50) {
                         printf("\n");
                         cur_col = 0;
                 }
                 cur_col += printf("HADDR = 0x%x%x, HCNT = 0x%x ",
                                   ahd_inl(ahd, HADDR+4),
                                   ahd_inl(ahd, HADDR),
                                   (ahd_inb(ahd, HCNT)
                                 | (ahd_inb(ahd, HCNT + 1) << 8)
                                 | (ahd_inb(ahd, HCNT + 2) << 16)));
                 ahd_ccsgctl_print(ahd_inb(ahd, CCSGCTL), &cur_col, 50);
 #ifdef AHD_DEBUG
                 if ((ahd_debug & AHD_SHOW_SG) != 0) {
                         fifo_scb = ahd_lookup_scb(ahd, fifo_scbptr);
                         if (fifo_scb != NULL)
                                 ahd_dump_sglist(fifo_scb);
                 }
 #endif
         }
         printf("\nLQIN: ");
         for (i = 0; i < 20; i++)
                 printf("0x%x ", ahd_inb(ahd, LQIN + i));
         printf("\n");
         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
         printf("%s: LQISTATE = 0x%x, LQOSTATE = 0x%x, OPTIONMODE = 0x%x\n",
                ahd_name(ahd), ahd_inb(ahd, LQISTATE), ahd_inb(ahd, LQOSTATE),
                ahd_inb(ahd, OPTIONMODE));
         printf("%s: OS_SPACE_CNT = 0x%x MAXCMDCNT = 0x%x\n",
                ahd_name(ahd), ahd_inb(ahd, OS_SPACE_CNT),
                ahd_inb(ahd, MAXCMDCNT));
         printf("%s: SAVED_SCSIID = 0x%x SAVED_LUN = 0x%x\n",
                ahd_name(ahd), ahd_inb(ahd, SAVED_SCSIID),
                ahd_inb(ahd, SAVED_LUN));
         ahd_simode0_print(ahd_inb(ahd, SIMODE0), &cur_col, 50);
         printf("\n");
         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
         cur_col = 0;
         ahd_ccscbctl_print(ahd_inb(ahd, CCSCBCTL), &cur_col, 50);
         printf("\n");
         ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
         printf("%s: REG0 == 0x%x, SINDEX = 0x%x, DINDEX = 0x%x\n",
                ahd_name(ahd), ahd_inw(ahd, REG0), ahd_inw(ahd, SINDEX),
                ahd_inw(ahd, DINDEX));
         printf("%s: SCBPTR == 0x%x, SCB_NEXT == 0x%x, SCB_NEXT2 == 0x%x\n",
                ahd_name(ahd), ahd_get_scbptr(ahd),
                ahd_inw_scbram(ahd, SCB_NEXT),
                ahd_inw_scbram(ahd, SCB_NEXT2));
         printf("CDB %x %x %x %x %x %x\n",
                ahd_inb_scbram(ahd, SCB_CDB_STORE),
                ahd_inb_scbram(ahd, SCB_CDB_STORE+1),
                ahd_inb_scbram(ahd, SCB_CDB_STORE+2),
                ahd_inb_scbram(ahd, SCB_CDB_STORE+3),
                ahd_inb_scbram(ahd, SCB_CDB_STORE+4),
                ahd_inb_scbram(ahd, SCB_CDB_STORE+5));
         printf("STACK:");
         for (i = 0; i < ahd->stack_size; i++) {
                 ahd->saved_stack[i] =
                     ahd_inb(ahd, STACK)|(ahd_inb(ahd, STACK) << 8);
                 printf(" 0x%x", ahd->saved_stack[i]);
         }
         for (i = ahd->stack_size-1; i >= 0; i--) {
                 ahd_outb(ahd, STACK, ahd->saved_stack[i] & 0xFF);
                 ahd_outb(ahd, STACK, (ahd->saved_stack[i] >> 8) & 0xFF);
         }
         printf("\n<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>\n");
         ahd_restore_modes(ahd, saved_modes);
         if (paused == 0)
                 ahd_unpause(ahd);
 }
 
 #if 0
 void
 ahd_dump_scbs(struct ahd_softc *ahd)
 {
         ahd_mode_state saved_modes;
         u_int               saved_scb_index;
         int               i;
 
         saved_modes = ahd_save_modes(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
         saved_scb_index = ahd_get_scbptr(ahd);
         for (i = 0; i < AHD_SCB_MAX; i++) {
                 ahd_set_scbptr(ahd, i);
                 printf("%3d", i);
                 printf("(CTRL 0x%x ID 0x%x N 0x%x N2 0x%x SG 0x%x, RSG 0x%x)\n",
                       ahd_inb_scbram(ahd, SCB_CONTROL),
                       ahd_inb_scbram(ahd, SCB_SCSIID),
                       ahd_inw_scbram(ahd, SCB_NEXT),
                       ahd_inw_scbram(ahd, SCB_NEXT2),
                       ahd_inl_scbram(ahd, SCB_SGPTR),
                       ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR));
        }
        printf("\n");
        ahd_set_scbptr(ahd, saved_scb_index);
        ahd_restore_modes(ahd, saved_modes);
}
#endif  /*  0  */

/**************************** Flexport Logic **********************************/
/*
 * Read count 16bit words from 16bit word address start_addr from the
 * SEEPROM attached to the controller, into buf, using the controller's
 * SEEPROM reading state machine.  Optionally treat the data as a byte
 * stream in terms of byte order.
 */
int
ahd_read_seeprom(struct ahd_softc *ahd, uint16_t *buf,
                 u_int start_addr, u_int count, int bytestream)
{
        u_int cur_addr;
        u_int end_addr;
        int   error;

        /*
         * If we never make it through the loop even once,
         * we were passed invalid arguments.
         */
        error = EINVAL;
        AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
        end_addr = start_addr + count;
        for (cur_addr = start_addr; cur_addr < end_addr; cur_addr++) {

                ahd_outb(ahd, SEEADR, cur_addr);
                ahd_outb(ahd, SEECTL, SEEOP_READ | SEESTART);
                
                error = ahd_wait_seeprom(ahd);
                if (error)
                        break;
                if (bytestream != 0) {
                        uint8_t *bytestream_ptr;

                        bytestream_ptr = (uint8_t *)buf;
                        *bytestream_ptr++ = ahd_inb(ahd, SEEDAT);
                        *bytestream_ptr = ahd_inb(ahd, SEEDAT+1);
                } else {
                        /*
                         * ahd_inw() already handles machine byte order.
                         */
                        *buf = ahd_inw(ahd, SEEDAT);
                }
                buf++;
        }
        return (error);
}

/*
 * Write count 16bit words from buf, into SEEPROM attache to the
 * controller starting at 16bit word address start_addr, using the
 * controller's SEEPROM writing state machine.
 */
int
ahd_write_seeprom(struct ahd_softc *ahd, uint16_t *buf,
                  u_int start_addr, u_int count)
{
        u_int cur_addr;
        u_int end_addr;
        int   error;
        int   retval;

        AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
        error = ENOENT;

        /* Place the chip into write-enable mode */
        ahd_outb(ahd, SEEADR, SEEOP_EWEN_ADDR);
        ahd_outb(ahd, SEECTL, SEEOP_EWEN | SEESTART);
        error = ahd_wait_seeprom(ahd);
        if (error)
                return (error);

        /*
         * Write the data.  If we don't get throught the loop at
         * least once, the arguments were invalid.
         */
        retval = EINVAL;
        end_addr = start_addr + count;
        for (cur_addr = start_addr; cur_addr < end_addr; cur_addr++) {
                ahd_outw(ahd, SEEDAT, *buf++);
                ahd_outb(ahd, SEEADR, cur_addr);
                ahd_outb(ahd, SEECTL, SEEOP_WRITE | SEESTART);
                
                retval = ahd_wait_seeprom(ahd);
                if (retval)
                        break;
        }

        /*
         * Disable writes.
         */
        ahd_outb(ahd, SEEADR, SEEOP_EWDS_ADDR);
        ahd_outb(ahd, SEECTL, SEEOP_EWDS | SEESTART);
        error = ahd_wait_seeprom(ahd);
        if (error)
                return (error);
        return (retval);
}

/*
 * Wait ~100us for the serial eeprom to satisfy our request.
 */
static int
ahd_wait_seeprom(struct ahd_softc *ahd)
{
        int cnt;

        cnt = 5000;
        while ((ahd_inb(ahd, SEESTAT) & (SEEARBACK|SEEBUSY)) != 0 && --cnt)
                ahd_delay(5);

        if (cnt == 0)
                return (ETIMEDOUT);
        return (0);
}

/*
 * Validate the two checksums in the per_channel
 * vital product data struct.
 */
static int
ahd_verify_vpd_cksum(struct vpd_config *vpd)
{
        int i;
        int maxaddr;
        uint32_t checksum;
        uint8_t *vpdarray;

        vpdarray = (uint8_t *)vpd;
        maxaddr = offsetof(struct vpd_config, vpd_checksum);
        checksum = 0;
        for (i = offsetof(struct vpd_config, resource_type); i < maxaddr; i++)
                checksum = checksum + vpdarray[i];
        if (checksum == 0
         || (-checksum & 0xFF) != vpd->vpd_checksum)
                return (0);

        checksum = 0;
        maxaddr = offsetof(struct vpd_config, checksum);
        for (i = offsetof(struct vpd_config, default_target_flags);
             i < maxaddr; i++)
                checksum = checksum + vpdarray[i];
        if (checksum == 0
         || (-checksum & 0xFF) != vpd->checksum)
                return (0);
        return (1);
}

int
ahd_verify_cksum(struct seeprom_config *sc)
{
        int i;
        int maxaddr;
        uint32_t checksum;
        uint16_t *scarray;

        maxaddr = (sizeof(*sc)/2) - 1;
        checksum = 0;
        scarray = (uint16_t *)sc;

        for (i = 0; i < maxaddr; i++)
                checksum = checksum + scarray[i];
        if (checksum == 0
         || (checksum & 0xFFFF) != sc->checksum) {
                return (0);
        } else {
                return (1);
        }
}

int
ahd_acquire_seeprom(struct ahd_softc *ahd)
{
        /*
         * We should be able to determine the SEEPROM type
         * from the flexport logic, but unfortunately not
         * all implementations have this logic and there is
         * no programatic method for determining if the logic
         * is present.
         */
        return (1);
#if 0
        uint8_t        seetype;
        int        error;

        error = ahd_read_flexport(ahd, FLXADDR_ROMSTAT_CURSENSECTL, &seetype);
        if (error != 0
         || ((seetype & FLX_ROMSTAT_SEECFG) == FLX_ROMSTAT_SEE_NONE))
                return (0);
        return (1);
#endif
}

void
ahd_release_seeprom(struct ahd_softc *ahd)
{
        /* Currently a no-op */
}

/*
 * Wait at most 2 seconds for flexport arbitration to succeed.
 */
static int
ahd_wait_flexport(struct ahd_softc *ahd)
{
        int cnt;

        AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
        cnt = 1000000 * 2 / 5;
        while ((ahd_inb(ahd, BRDCTL) & FLXARBACK) == 0 && --cnt)
                ahd_delay(5);

        if (cnt == 0)
                return (ETIMEDOUT);
        return (0);
}

int
ahd_write_flexport(struct ahd_softc *ahd, u_int addr, u_int value)
{
        int error;

        AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
        if (addr > 7)
                panic("ahd_write_flexport: address out of range");
        ahd_outb(ahd, BRDCTL, BRDEN|(addr << 3));
        error = ahd_wait_flexport(ahd);
        if (error != 0)
                return (error);
        ahd_outb(ahd, BRDDAT, value);
        ahd_flush_device_writes(ahd);
        ahd_outb(ahd, BRDCTL, BRDSTB|BRDEN|(addr << 3));
        ahd_flush_device_writes(ahd);
        ahd_outb(ahd, BRDCTL, BRDEN|(addr << 3));
        ahd_flush_device_writes(ahd);
        ahd_outb(ahd, BRDCTL, 0);
        ahd_flush_device_writes(ahd);
        return (0);
}

int
ahd_read_flexport(struct ahd_softc *ahd, u_int addr, uint8_t *value)
{
        int        error;

        AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
        if (addr > 7)
                panic("ahd_read_flexport: address out of range");
        ahd_outb(ahd, BRDCTL, BRDRW|BRDEN|(addr << 3));
        error = ahd_wait_flexport(ahd);
        if (error != 0)
                return (error);
        *value = ahd_inb(ahd, BRDDAT);
        ahd_outb(ahd, BRDCTL, 0);
        ahd_flush_device_writes(ahd);
        return (0);
}

/************************* Target Mode ****************************************/
#ifdef AHD_TARGET_MODE
cam_status
ahd_find_tmode_devs(struct ahd_softc *ahd, struct cam_sim *sim, union ccb *ccb,
                    struct ahd_tmode_tstate **tstate,
                    struct ahd_tmode_lstate **lstate,
                    int notfound_failure)
{

        if ((ahd->features & AHD_TARGETMODE) == 0)
                return (CAM_REQ_INVALID);

        /*
         * Handle the 'black hole' device that sucks up
         * requests to unattached luns on enabled targets.
         */
        if (ccb->ccb_h.target_id == CAM_TARGET_WILDCARD
         && ccb->ccb_h.target_lun == CAM_LUN_WILDCARD) {
                *tstate = NULL;
                *lstate = ahd->black_hole;
        } else {
                u_int max_id;

                max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
                if (ccb->ccb_h.target_id >= max_id)
                        return (CAM_TID_INVALID);

                if (ccb->ccb_h.target_lun >= AHD_NUM_LUNS)
                        return (CAM_LUN_INVALID);

                *tstate = ahd->enabled_targets[ccb->ccb_h.target_id];
                *lstate = NULL;
                if (*tstate != NULL)
                        *lstate =
                            (*tstate)->enabled_luns[ccb->ccb_h.target_lun];
        }

        if (notfound_failure != 0 && *lstate == NULL)
                return (CAM_PATH_INVALID);

        return (CAM_REQ_CMP);
}

void
ahd_handle_en_lun(struct ahd_softc *ahd, struct cam_sim *sim, union ccb *ccb)
{
#if NOT_YET
        struct           ahd_tmode_tstate *tstate;
        struct           ahd_tmode_lstate *lstate;
        struct           ccb_en_lun *cel;
        cam_status status;
        u_int           target;
        u_int           lun;
        u_int           target_mask;
        u_long           s;
        char           channel;

        status = ahd_find_tmode_devs(ahd, sim, ccb, &tstate, &lstate,
                                     /*notfound_failure*/FALSE);

        if (status != CAM_REQ_CMP) {
                ccb->ccb_h.status = status;
                return;
        }

        if ((ahd->features & AHD_MULTIROLE) != 0) {
                u_int           our_id;

                our_id = ahd->our_id;
                if (ccb->ccb_h.target_id != our_id) {
                        if ((ahd->features & AHD_MULTI_TID) != 0
                            && (ahd->flags & AHD_INITIATORROLE) != 0) {
                                /*
                                 * Only allow additional targets if
                                 * the initiator role is disabled.
                                 * The hardware cannot handle a re-select-in
                                 * on the initiator id during a re-select-out
                                 * on a different target id.
                                 */
                                status = CAM_TID_INVALID;
                        } else if ((ahd->flags & AHD_INITIATORROLE) != 0
                                || ahd->enabled_luns > 0) {
                                /*
                                 * Only allow our target id to change
                                 * if the initiator role is not configured
                                 * and there are no enabled luns which
                                 * are attached to the currently registered
                                 * scsi id.
                                 */
                                status = CAM_TID_INVALID;
                        }
                }
        }

        if (status != CAM_REQ_CMP) {
                ccb->ccb_h.status = status;
                return;
        }

        /*
         * We now have an id that is valid.
         * If we aren't in target mode, switch modes.
         */
        if ((ahd->flags & AHD_TARGETROLE) == 0
         && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
                u_long        s;

                printf("Configuring Target Mode\n");
                ahd_lock(ahd, &s);
                if (LIST_FIRST(&ahd->pending_scbs) != NULL) {
                        ccb->ccb_h.status = CAM_BUSY;
                        ahd_unlock(ahd, &s);
                        return;
                }
                ahd->flags |= AHD_TARGETROLE;
                if ((ahd->features & AHD_MULTIROLE) == 0)
                        ahd->flags &= ~AHD_INITIATORROLE;
                ahd_pause(ahd);
                ahd_loadseq(ahd);
                ahd_restart(ahd);
                ahd_unlock(ahd, &s);
        }
        cel = &ccb->cel;
        target = ccb->ccb_h.target_id;
        lun = ccb->ccb_h.target_lun;
        channel = SIM_CHANNEL(ahd, sim);
        target_mask = 0x01 << target;
        if (channel == 'B')
                target_mask <<= 8;

        if (cel->enable != 0) {
                u_int scsiseq1;

                /* Are we already enabled?? */
                if (lstate != NULL) {
                        xpt_print_path(ccb->ccb_h.path);
                        printf("Lun already enabled\n");
                        ccb->ccb_h.status = CAM_LUN_ALRDY_ENA;
                        return;
                }

                if (cel->grp6_len != 0
                 || cel->grp7_len != 0) {
                        /*
                         * Don't (yet?) support vendor
                         * specific commands.
                         */
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        printf("Non-zero Group Codes\n");
                        return;
                }

                /*
                 * Seems to be okay.
                 * Setup our data structures.
                 */
                if (target != CAM_TARGET_WILDCARD && tstate == NULL) {
                        tstate = ahd_alloc_tstate(ahd, target, channel);
                        if (tstate == NULL) {
                                xpt_print_path(ccb->ccb_h.path);
                                printf("Couldn't allocate tstate\n");
                                ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
                                return;
                        }
                }
                lstate = malloc(sizeof(*lstate), M_DEVBUF, M_NOWAIT);
                if (lstate == NULL) {
                        xpt_print_path(ccb->ccb_h.path);
                        printf("Couldn't allocate lstate\n");
                        ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
                        return;
                }
                memset(lstate, 0, sizeof(*lstate));
                status = xpt_create_path(&lstate->path, /*periph*/NULL,
                                         xpt_path_path_id(ccb->ccb_h.path),
                                         xpt_path_target_id(ccb->ccb_h.path),
                                         xpt_path_lun_id(ccb->ccb_h.path));
                if (status != CAM_REQ_CMP) {
                        free(lstate, M_DEVBUF);
                        xpt_print_path(ccb->ccb_h.path);
                        printf("Couldn't allocate path\n");
                        ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
                        return;
                }
                SLIST_INIT(&lstate->accept_tios);
                SLIST_INIT(&lstate->immed_notifies);
                ahd_lock(ahd, &s);
                ahd_pause(ahd);
                if (target != CAM_TARGET_WILDCARD) {
                        tstate->enabled_luns[lun] = lstate;
                        ahd->enabled_luns++;

                        if ((ahd->features & AHD_MULTI_TID) != 0) {
                                u_int targid_mask;

                                targid_mask = ahd_inw(ahd, TARGID);
                                targid_mask |= target_mask;
                                ahd_outw(ahd, TARGID, targid_mask);
                                ahd_update_scsiid(ahd, targid_mask);
                        } else {
                                u_int our_id;
                                char  channel;

                                channel = SIM_CHANNEL(ahd, sim);
                                our_id = SIM_SCSI_ID(ahd, sim);

                                /*
                                 * This can only happen if selections
                                 * are not enabled
                                 */
                                if (target != our_id) {
                                        u_int sblkctl;
                                        char  cur_channel;
                                        int   swap;

                                        sblkctl = ahd_inb(ahd, SBLKCTL);
                                        cur_channel = (sblkctl & SELBUSB)
                                                    ? 'B' : 'A';
                                        if ((ahd->features & AHD_TWIN) == 0)
                                                cur_channel = 'A';
                                        swap = cur_channel != channel;
                                        ahd->our_id = target;

                                        if (swap)
                                                ahd_outb(ahd, SBLKCTL,
                                                         sblkctl ^ SELBUSB);

                                        ahd_outb(ahd, SCSIID, target);

                                        if (swap)
                                                ahd_outb(ahd, SBLKCTL, sblkctl);
                                }
                        }
                } else
                        ahd->black_hole = lstate;
                /* Allow select-in operations */
                if (ahd->black_hole != NULL && ahd->enabled_luns > 0) {
                        scsiseq1 = ahd_inb(ahd, SCSISEQ_TEMPLATE);
                        scsiseq1 |= ENSELI;
                        ahd_outb(ahd, SCSISEQ_TEMPLATE, scsiseq1);
                        scsiseq1 = ahd_inb(ahd, SCSISEQ1);
                        scsiseq1 |= ENSELI;
                        ahd_outb(ahd, SCSISEQ1, scsiseq1);
                }
                ahd_unpause(ahd);
                ahd_unlock(ahd, &s);
                ccb->ccb_h.status = CAM_REQ_CMP;
                xpt_print_path(ccb->ccb_h.path);
                printf("Lun now enabled for target mode\n");
        } else {
                struct scb *scb;
                int i, empty;

                if (lstate == NULL) {
                        ccb->ccb_h.status = CAM_LUN_INVALID;
                        return;
                }

                ahd_lock(ahd, &s);
                
                ccb->ccb_h.status = CAM_REQ_CMP;
                LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
                        struct ccb_hdr *ccbh;

                        ccbh = &scb->io_ctx->ccb_h;
                        if (ccbh->func_code == XPT_CONT_TARGET_IO
                         && !xpt_path_comp(ccbh->path, ccb->ccb_h.path)){
                                printf("CTIO pending\n");
                                ccb->ccb_h.status = CAM_REQ_INVALID;
                                ahd_unlock(ahd, &s);
                                return;
                        }
                }

                if (SLIST_FIRST(&lstate->accept_tios) != NULL) {
                        printf("ATIOs pending\n");
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                }

                if (SLIST_FIRST(&lstate->immed_notifies) != NULL) {
                        printf("INOTs pending\n");
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                }

                if (ccb->ccb_h.status != CAM_REQ_CMP) {
                        ahd_unlock(ahd, &s);
                        return;
                }

                xpt_print_path(ccb->ccb_h.path);
                printf("Target mode disabled\n");
                xpt_free_path(lstate->path);
                free(lstate, M_DEVBUF);

                ahd_pause(ahd);
                /* Can we clean up the target too? */
                if (target != CAM_TARGET_WILDCARD) {
                        tstate->enabled_luns[lun] = NULL;
                        ahd->enabled_luns--;
                        for (empty = 1, i = 0; i < 8; i++)
                                if (tstate->enabled_luns[i] != NULL) {
                                        empty = 0;
                                        break;
                                }

                        if (empty) {
                                ahd_free_tstate(ahd, target, channel,
                                                /*force*/FALSE);
                                if (ahd->features & AHD_MULTI_TID) {
                                        u_int targid_mask;

                                        targid_mask = ahd_inw(ahd, TARGID);
                                        targid_mask &= ~target_mask;
                                        ahd_outw(ahd, TARGID, targid_mask);
                                        ahd_update_scsiid(ahd, targid_mask);
                                }
                        }
                } else {

                        ahd->black_hole = NULL;

                        /*
                         * We can't allow selections without
                         * our black hole device.
                         */
                        empty = TRUE;
                }
                if (ahd->enabled_luns == 0) {
                        /* Disallow select-in */
                        u_int scsiseq1;

                        scsiseq1 = ahd_inb(ahd, SCSISEQ_TEMPLATE);
                        scsiseq1 &= ~ENSELI;
                        ahd_outb(ahd, SCSISEQ_TEMPLATE, scsiseq1);
                        scsiseq1 = ahd_inb(ahd, SCSISEQ1);
                        scsiseq1 &= ~ENSELI;
                        ahd_outb(ahd, SCSISEQ1, scsiseq1);

                        if ((ahd->features & AHD_MULTIROLE) == 0) {
                                printf("Configuring Initiator Mode\n");
                                ahd->flags &= ~AHD_TARGETROLE;
                                ahd->flags |= AHD_INITIATORROLE;
                                ahd_pause(ahd);
                                ahd_loadseq(ahd);
                                ahd_restart(ahd);
                                /*
                                 * Unpaused.  The extra unpause
                                 * that follows is harmless.
                                 */
                        }
                }
                ahd_unpause(ahd);
                ahd_unlock(ahd, &s);
        }
#endif
}

static void
ahd_update_scsiid(struct ahd_softc *ahd, u_int targid_mask)
{
#if NOT_YET
        u_int scsiid_mask;
        u_int scsiid;

        if ((ahd->features & AHD_MULTI_TID) == 0)
                panic("ahd_update_scsiid called on non-multitid unit\n");

        /*
         * Since we will rely on the TARGID mask
         * for selection enables, ensure that OID
         * in SCSIID is not set to some other ID
         * that we don't want to allow selections on.
         */
        if ((ahd->features & AHD_ULTRA2) != 0)
                scsiid = ahd_inb(ahd, SCSIID_ULTRA2);
        else
                scsiid = ahd_inb(ahd, SCSIID);
        scsiid_mask = 0x1 << (scsiid & OID);
        if ((targid_mask & scsiid_mask) == 0) {
                u_int our_id;

                /* ffs counts from 1 */
                our_id = ffs(targid_mask);
                if (our_id == 0)
                        our_id = ahd->our_id;
                else
                        our_id--;
                scsiid &= TID;
                scsiid |= our_id;
        }
        if ((ahd->features & AHD_ULTRA2) != 0)
                ahd_outb(ahd, SCSIID_ULTRA2, scsiid);
        else
                ahd_outb(ahd, SCSIID, scsiid);
#endif
}

static void
ahd_run_tqinfifo(struct ahd_softc *ahd, int paused)
{
        struct target_cmd *cmd;

        ahd_sync_tqinfifo(ahd, BUS_DMASYNC_POSTREAD);
        while ((cmd = &ahd->targetcmds[ahd->tqinfifonext])->cmd_valid != 0) {

                /*
                 * Only advance through the queue if we
                 * have the resources to process the command.
                 */
                if (ahd_handle_target_cmd(ahd, cmd) != 0)
                        break;

                cmd->cmd_valid = 0;
                ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
                                ahd->shared_data_map.dmamap,
                                ahd_targetcmd_offset(ahd, ahd->tqinfifonext),
                                sizeof(struct target_cmd),
                                BUS_DMASYNC_PREREAD);
                ahd->tqinfifonext++;

                /*
                 * Lazily update our position in the target mode incoming
                 * command queue as seen by the sequencer.
                 */
                if ((ahd->tqinfifonext & (HOST_TQINPOS - 1)) == 1) {
                        u_int hs_mailbox;

                        hs_mailbox = ahd_inb(ahd, HS_MAILBOX);
                        hs_mailbox &= ~HOST_TQINPOS;
                        hs_mailbox |= ahd->tqinfifonext & HOST_TQINPOS;
                        ahd_outb(ahd, HS_MAILBOX, hs_mailbox);
                }
        }
}

static int
ahd_handle_target_cmd(struct ahd_softc *ahd, struct target_cmd *cmd)
{
        struct          ahd_tmode_tstate *tstate;
        struct          ahd_tmode_lstate *lstate;
        struct          ccb_accept_tio *atio;
        uint8_t *byte;
        int          initiator;
        int          target;
        int          lun;

        initiator = SCSIID_TARGET(ahd, cmd->scsiid);
        target = SCSIID_OUR_ID(cmd->scsiid);
        lun    = (cmd->identify & MSG_IDENTIFY_LUNMASK);

        byte = cmd->bytes;
        tstate = ahd->enabled_targets[target];
        lstate = NULL;
        if (tstate != NULL)
                lstate = tstate->enabled_luns[lun];

        /*
         * Commands for disabled luns go to the black hole driver.
         */
        if (lstate == NULL)
                lstate = ahd->black_hole;

        atio = (struct ccb_accept_tio*)SLIST_FIRST(&lstate->accept_tios);
        if (atio == NULL) {
                ahd->flags |= AHD_TQINFIFO_BLOCKED;
                /*
                 * Wait for more ATIOs from the peripheral driver for this lun.
                 */
                return (1);
        } else
                ahd->flags &= ~AHD_TQINFIFO_BLOCKED;
#ifdef AHD_DEBUG
        if ((ahd_debug & AHD_SHOW_TQIN) != 0)
                printf("Incoming command from %d for %d:%d%s\n",
                       initiator, target, lun,
                       lstate == ahd->black_hole ? "(Black Holed)" : "");
#endif
        SLIST_REMOVE_HEAD(&lstate->accept_tios, sim_links.sle);

        if (lstate == ahd->black_hole) {
                /* Fill in the wildcards */
                atio->ccb_h.target_id = target;
                atio->ccb_h.target_lun = lun;
        }

        /*
         * Package it up and send it off to
         * whomever has this lun enabled.
         */
        atio->sense_len = 0;
        atio->init_id = initiator;
        if (byte[0] != 0xFF) {
                /* Tag was included */
                atio->tag_action = *byte++;
                atio->tag_id = *byte++;
                atio->ccb_h.flags = CAM_TAG_ACTION_VALID;
        } else {
                atio->ccb_h.flags = 0;
        }
        byte++;

        /* Okay.  Now determine the cdb size based on the command code */
        switch (*byte >> CMD_GROUP_CODE_SHIFT) {
        case 0:
                atio->cdb_len = 6;
                break;
        case 1:
        case 2:
                atio->cdb_len = 10;
                break;
        case 4:
                atio->cdb_len = 16;
                break;
        case 5:
                atio->cdb_len = 12;
                break;
        case 3:
        default:
                /* Only copy the opcode. */
                atio->cdb_len = 1;
                printf("Reserved or VU command code type encountered\n");
                break;
        }
        
        memcpy(atio->cdb_io.cdb_bytes, byte, atio->cdb_len);

        atio->ccb_h.status |= CAM_CDB_RECVD;

        if ((cmd->identify & MSG_IDENTIFY_DISCFLAG) == 0) {
                /*
                 * We weren't allowed to disconnect.
                 * We're hanging on the bus until a
                 * continue target I/O comes in response
                 * to this accept tio.
                 */
#ifdef AHD_DEBUG
                if ((ahd_debug & AHD_SHOW_TQIN) != 0)
                        printf("Received Immediate Command %d:%d:%d - %p\n",
                               initiator, target, lun, ahd->pending_device);
#endif
                ahd->pending_device = lstate;
                ahd_freeze_ccb((union ccb *)atio);
                atio->ccb_h.flags |= CAM_DIS_DISCONNECT;
        }
        xpt_done((union ccb*)atio);
        return (0);
}

#endif