ClabureDB: Classified Bug-Reports Database

   /*
    *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
    *
    *  Copyright (C) 2000       Andrew Henroid
    *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
    *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
    *  Copyright (c) 2008 Intel Corporation
    *   Author: Matthew Wilcox <willy@linux.intel.com>
    *
   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   *
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/mm.h>
  #include <linux/pci.h>
  #include <linux/interrupt.h>
  #include <linux/kmod.h>
  #include <linux/delay.h>
  #include <linux/workqueue.h>
  #include <linux/nmi.h>
  #include <linux/acpi.h>
  #include <linux/efi.h>
  #include <linux/ioport.h>
  #include <linux/list.h>
  #include <linux/jiffies.h>
  #include <linux/semaphore.h>
  
  #include <asm/io.h>
  #include <asm/uaccess.h>
  
  #include <acpi/acpi.h>
  #include <acpi/acpi_bus.h>
  #include <acpi/processor.h>
  
  #define _COMPONENT                ACPI_OS_SERVICES
  ACPI_MODULE_NAME("osl");
  #define PREFIX                "ACPI: "
  struct acpi_os_dpc {
          acpi_osd_exec_callback function;
          void *context;
          struct work_struct work;
  };
  
  #ifdef CONFIG_ACPI_CUSTOM_DSDT
  #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  #endif
  
  #ifdef ENABLE_DEBUGGER
  #include <linux/kdb.h>
  
  /* stuff for debugger support */
  int acpi_in_debugger;
  EXPORT_SYMBOL(acpi_in_debugger);
  
  extern char line_buf[80];
  #endif                                /*ENABLE_DEBUGGER */
  
  static unsigned int acpi_irq_irq;
  static acpi_osd_handler acpi_irq_handler;
  static void *acpi_irq_context;
  static struct workqueue_struct *kacpid_wq;
  static struct workqueue_struct *kacpi_notify_wq;
  
  struct acpi_res_list {
          resource_size_t start;
          resource_size_t end;
          acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
          char name[5];   /* only can have a length of 4 chars, make use of this
                             one instead of res->name, no need to kalloc then */
          struct list_head resource_list;
  };
  
  static LIST_HEAD(resource_list_head);
  static DEFINE_SPINLOCK(acpi_res_lock);
  
  #define        OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  
  /*
   * The story of _OSI(Linux)
  *
  * From pre-history through Linux-2.6.22,
  * Linux responded TRUE upon a BIOS OSI(Linux) query.
  *
  * Unfortunately, reference BIOS writers got wind of this
  * and put OSI(Linux) in their example code, quickly exposing
  * this string as ill-conceived and opening the door to
  * an un-bounded number of BIOS incompatibilities.
  *
  * For example, OSI(Linux) was used on resume to re-POST a
  * video card on one system, because Linux at that time
  * could not do a speedy restore in its native driver.
  * But then upon gaining quick native restore capability,
  * Linux has no way to tell the BIOS to skip the time-consuming
  * POST -- putting Linux at a permanent performance disadvantage.
  * On another system, the BIOS writer used OSI(Linux)
  * to infer native OS support for IPMI!  On other systems,
  * OSI(Linux) simply got in the way of Linux claiming to
  * be compatible with other operating systems, exposing
  * BIOS issues such as skipped device initialization.
  *
  * So "Linux" turned out to be a really poor chose of
  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
  *
  * BIOS writers should NOT query _OSI(Linux) on future systems.
  * Linux will complain on the console when it sees it, and return FALSE.
  * To get Linux to return TRUE for your system  will require
  * a kernel source update to add a DMI entry,
  * or boot with "acpi_osi=Linux"
  */
 
 static struct osi_linux {
         unsigned int        enable:1;
         unsigned int        dmi:1;
         unsigned int        cmdline:1;
         unsigned int        known:1;
 } osi_linux = { 0, 0, 0, 0};
 
 static void __init acpi_request_region (struct acpi_generic_address *addr,
         unsigned int length, char *desc)
 {
         struct resource *res;
 
         if (!addr->address || !length)
                 return;
 
         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
                 res = request_region(addr->address, length, desc);
         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
                 res = request_mem_region(addr->address, length, desc);
 }
 
 static int __init acpi_reserve_resources(void)
 {
         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
                 "ACPI PM1a_EVT_BLK");
 
         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
                 "ACPI PM1b_EVT_BLK");
 
         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
                 "ACPI PM1a_CNT_BLK");
 
         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
                 "ACPI PM1b_CNT_BLK");
 
         if (acpi_gbl_FADT.pm_timer_length == 4)
                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 
         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
                 "ACPI PM2_CNT_BLK");
 
         /* Length of GPE blocks must be a non-negative multiple of 2 */
 
         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 
         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 
         return 0;
 }
 device_initcall(acpi_reserve_resources);
 
 acpi_status __init acpi_os_initialize(void)
 {
         return AE_OK;
 }
 
 acpi_status acpi_os_initialize1(void)
 {
         kacpid_wq = create_singlethread_workqueue("kacpid");
         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
         BUG_ON(!kacpid_wq);
         BUG_ON(!kacpi_notify_wq);
         return AE_OK;
 }
 
 acpi_status acpi_os_terminate(void)
 {
         if (acpi_irq_handler) {
                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
                                                  acpi_irq_handler);
         }
 
         destroy_workqueue(kacpid_wq);
         destroy_workqueue(kacpi_notify_wq);
 
         return AE_OK;
 }
 
 void acpi_os_printf(const char *fmt, ...)
 {
         va_list args;
         va_start(args, fmt);
         acpi_os_vprintf(fmt, args);
         va_end(args);
 }
 
 void acpi_os_vprintf(const char *fmt, va_list args)
 {
         static char buffer[512];
 
         vsprintf(buffer, fmt, args);
 
 #ifdef ENABLE_DEBUGGER
         if (acpi_in_debugger) {
                 kdb_printf("%s", buffer);
         } else {
                 printk("%s", buffer);
         }
 #else
         printk("%s", buffer);
 #endif
 }
 
 acpi_physical_address __init acpi_os_get_root_pointer(void)
 {
         if (efi_enabled) {
                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
                         return efi.acpi20;
                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
                         return efi.acpi;
                 else {
                         printk(KERN_ERR PREFIX
                                "System description tables not found\n");
                         return 0;
                 }
         } else {
                 acpi_physical_address pa = 0;
 
                 acpi_find_root_pointer(&pa);
                 return pa;
         }
 }
 
 void __iomem *__init_refok
 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 {
         if (phys > ULONG_MAX) {
                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
                 return NULL;
         }
         if (acpi_gbl_permanent_mmap)
                 /*
                 * ioremap checks to ensure this is in reserved space
                 */
                 return ioremap((unsigned long)phys, size);
         else
                 return __acpi_map_table((unsigned long)phys, size);
 }
 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 
 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 {
         if (acpi_gbl_permanent_mmap) {
                 iounmap(virt);
         }
 }
 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 
 #ifdef ACPI_FUTURE_USAGE
 acpi_status
 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 {
         if (!phys || !virt)
                 return AE_BAD_PARAMETER;
 
         *phys = virt_to_phys(virt);
 
         return AE_OK;
 }
 #endif
 
 #define ACPI_MAX_OVERRIDE_LEN 100
 
 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 
 acpi_status
 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
                             acpi_string * new_val)
 {
         if (!init_val || !new_val)
                 return AE_BAD_PARAMETER;
 
         *new_val = NULL;
         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
                        acpi_os_name);
                 *new_val = acpi_os_name;
         }
 
         return AE_OK;
 }
 
 acpi_status
 acpi_os_table_override(struct acpi_table_header * existing_table,
                        struct acpi_table_header ** new_table)
 {
         if (!existing_table || !new_table)
                 return AE_BAD_PARAMETER;
 
         *new_table = NULL;
 
 #ifdef CONFIG_ACPI_CUSTOM_DSDT
         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
                 *new_table = (struct acpi_table_header *)AmlCode;
 #endif
         if (*new_table != NULL) {
                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
                            "this is unsafe: tainting kernel\n",
                        existing_table->signature,
                        existing_table->oem_table_id);
                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
         }
         return AE_OK;
 }
 
 static irqreturn_t acpi_irq(int irq, void *dev_id)
 {
         u32 handled;
 
         handled = (*acpi_irq_handler) (acpi_irq_context);
 
         if (handled) {
                 acpi_irq_handled++;
                 return IRQ_HANDLED;
         } else
                 return IRQ_NONE;
 }
 
 acpi_status
 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
                                   void *context)
 {
         unsigned int irq;
 
         acpi_irq_stats_init();
 
         /*
          * Ignore the GSI from the core, and use the value in our copy of the
          * FADT. It may not be the same if an interrupt source override exists
          * for the SCI.
          */
         gsi = acpi_gbl_FADT.sci_interrupt;
         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
                        gsi);
                 return AE_OK;
         }
 
         acpi_irq_handler = handler;
         acpi_irq_context = context;
         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
                 return AE_NOT_ACQUIRED;
         }
         acpi_irq_irq = irq;
 
         return AE_OK;
 }
 
 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 {
         if (irq) {
                 free_irq(irq, acpi_irq);
                 acpi_irq_handler = NULL;
                 acpi_irq_irq = 0;
         }
 
         return AE_OK;
 }
 
 /*
  * Running in interpreter thread context, safe to sleep
  */
 
 void acpi_os_sleep(acpi_integer ms)
 {
         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 }
 
 void acpi_os_stall(u32 us)
 {
         while (us) {
                 u32 delay = 1000;
 
                 if (delay > us)
                         delay = us;
                 udelay(delay);
                 touch_nmi_watchdog();
                 us -= delay;
         }
 }
 
 /*
  * Support ACPI 3.0 AML Timer operand
  * Returns 64-bit free-running, monotonically increasing timer
  * with 100ns granularity
  */
 u64 acpi_os_get_timer(void)
 {
         static u64 t;
 
 #ifdef        CONFIG_HPET
         /* TBD: use HPET if available */
 #endif
 
 #ifdef        CONFIG_X86_PM_TIMER
         /* TBD: default to PM timer if HPET was not available */
 #endif
         if (!t)
                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 
         return ++t;
 }
 
 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 {
         u32 dummy;
 
         if (!value)
                 value = &dummy;
 
         *value = 0;
         if (width <= 8) {
                 *(u8 *) value = inb(port);
         } else if (width <= 16) {
                 *(u16 *) value = inw(port);
         } else if (width <= 32) {
                 *(u32 *) value = inl(port);
         } else {
                 BUG();
         }
 
         return AE_OK;
 }
 
 EXPORT_SYMBOL(acpi_os_read_port);
 
 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 {
         if (width <= 8) {
                 outb(value, port);
         } else if (width <= 16) {
                 outw(value, port);
         } else if (width <= 32) {
                 outl(value, port);
         } else {
                 BUG();
         }
 
         return AE_OK;
 }
 
 EXPORT_SYMBOL(acpi_os_write_port);
 
 acpi_status
 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 {
         u32 dummy;
         void __iomem *virt_addr;
 
         virt_addr = ioremap(phys_addr, width);
         if (!value)
                 value = &dummy;
 
         switch (width) {
         case 8:
                 *(u8 *) value = readb(virt_addr);
                 break;
         case 16:
                 *(u16 *) value = readw(virt_addr);
                 break;
         case 32:
                 *(u32 *) value = readl(virt_addr);
                 break;
         default:
                 BUG();
         }
 
         iounmap(virt_addr);
 
         return AE_OK;
 }
 
 acpi_status
 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 {
         void __iomem *virt_addr;
 
         virt_addr = ioremap(phys_addr, width);
 
         switch (width) {
         case 8:
                 writeb(value, virt_addr);
                 break;
         case 16:
                 writew(value, virt_addr);
                 break;
         case 32:
                 writel(value, virt_addr);
                 break;
         default:
                 BUG();
         }
 
         iounmap(virt_addr);
 
         return AE_OK;
 }
 
 acpi_status
 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
                                u32 *value, u32 width)
 {
         int result, size;
 
         if (!value)
                 return AE_BAD_PARAMETER;
 
         switch (width) {
         case 8:
                 size = 1;
                 break;
         case 16:
                 size = 2;
                 break;
         case 32:
                 size = 4;
                 break;
         default:
                 return AE_ERROR;
         }
 
         result = raw_pci_read(pci_id->segment, pci_id->bus,
                                 PCI_DEVFN(pci_id->device, pci_id->function),
                                 reg, size, value);
 
         return (result ? AE_ERROR : AE_OK);
 }
 
 acpi_status
 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
                                 acpi_integer value, u32 width)
 {
         int result, size;
 
         switch (width) {
         case 8:
                 size = 1;
                 break;
         case 16:
                 size = 2;
                 break;
         case 32:
                 size = 4;
                 break;
         default:
                 return AE_ERROR;
         }
 
         result = raw_pci_write(pci_id->segment, pci_id->bus,
                                 PCI_DEVFN(pci_id->device, pci_id->function),
                                 reg, size, value);
 
         return (result ? AE_ERROR : AE_OK);
 }
 
 /* TODO: Change code to take advantage of driver model more */
 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
                                     acpi_handle chandle,        /* current node */
                                     struct acpi_pci_id **id,
                                     int *is_bridge, u8 * bus_number)
 {
         acpi_handle handle;
         struct acpi_pci_id *pci_id = *id;
         acpi_status status;
         unsigned long long temp;
         acpi_object_type type;
 
         acpi_get_parent(chandle, &handle);
         if (handle != rhandle) {
                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
                                         bus_number);
 
                 status = acpi_get_type(handle, &type);
                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
                         return;
 
                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
                                           &temp);
                 if (ACPI_SUCCESS(status)) {
                         u32 val;
                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 
                         if (*is_bridge)
                                 pci_id->bus = *bus_number;
 
                         /* any nicer way to get bus number of bridge ? */
                         status =
                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
                                                            8);
                         if (ACPI_SUCCESS(status)
                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
                                 status =
                                     acpi_os_read_pci_configuration(pci_id, 0x18,
                                                                    &val, 8);
                                 if (!ACPI_SUCCESS(status)) {
                                         /* Certainly broken...  FIX ME */
                                         return;
                                 }
                                 *is_bridge = 1;
                                 pci_id->bus = val;
                                 status =
                                     acpi_os_read_pci_configuration(pci_id, 0x19,
                                                                    &val, 8);
                                 if (ACPI_SUCCESS(status)) {
                                         *bus_number = val;
                                 }
                         } else
                                 *is_bridge = 0;
                 }
         }
 }
 
 void acpi_os_derive_pci_id(acpi_handle rhandle,        /* upper bound  */
                            acpi_handle chandle,        /* current node */
                            struct acpi_pci_id **id)
 {
         int is_bridge = 1;
         u8 bus_number = (*id)->bus;
 
         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 }
 
 static void acpi_os_execute_deferred(struct work_struct *work)
 {
         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
         if (!dpc) {
                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
                 return;
         }
 
         dpc->function(dpc->context);
         kfree(dpc);
 
         return;
 }
 
 static void acpi_os_execute_hp_deferred(struct work_struct *work)
 {
         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
         if (!dpc) {
                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
                 return;
         }
 
         acpi_os_wait_events_complete(NULL);
 
         dpc->function(dpc->context);
         kfree(dpc);
 
         return;
 }
 
 /*******************************************************************************
  *
  * FUNCTION:    acpi_os_execute
  *
  * PARAMETERS:  Type               - Type of the callback
  *              Function           - Function to be executed
  *              Context            - Function parameters
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Depending on type, either queues function for deferred execution or
  *              immediately executes function on a separate thread.
  *
  ******************************************************************************/
 
 static acpi_status __acpi_os_execute(acpi_execute_type type,
         acpi_osd_exec_callback function, void *context, int hp)
 {
         acpi_status status = AE_OK;
         struct acpi_os_dpc *dpc;
         struct workqueue_struct *queue;
         int ret;
         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                           "Scheduling function [%p(%p)] for deferred execution.\n",
                           function, context));
 
         if (!function)
                 return AE_BAD_PARAMETER;
 
         /*
          * Allocate/initialize DPC structure.  Note that this memory will be
          * freed by the callee.  The kernel handles the work_struct list  in a
          * way that allows us to also free its memory inside the callee.
          * Because we may want to schedule several tasks with different
          * parameters we can't use the approach some kernel code uses of
          * having a static work_struct.
          */
 
         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
         if (!dpc)
                 return_ACPI_STATUS(AE_NO_MEMORY);
 
         dpc->function = function;
         dpc->context = context;
 
         if (!hp) {
                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
                 queue = (type == OSL_NOTIFY_HANDLER) ?
                         kacpi_notify_wq : kacpid_wq;
                 ret = queue_work(queue, &dpc->work);
         } else {
                 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
                 ret = schedule_work(&dpc->work);
         }
 
         if (!ret) {
                 printk(KERN_ERR PREFIX
                           "Call to queue_work() failed.\n");
                 status = AE_ERROR;
                 kfree(dpc);
         }
         return_ACPI_STATUS(status);
 }
 
 acpi_status acpi_os_execute(acpi_execute_type type,
                             acpi_osd_exec_callback function, void *context)
 {
         return __acpi_os_execute(type, function, context, 0);
 }
 EXPORT_SYMBOL(acpi_os_execute);
 
 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
         void *context)
 {
         return __acpi_os_execute(0, function, context, 1);
 }
 
 void acpi_os_wait_events_complete(void *context)
 {
         flush_workqueue(kacpid_wq);
         flush_workqueue(kacpi_notify_wq);
 }
 
 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 
 /*
  * Allocate the memory for a spinlock and initialize it.
  */
 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 {
         spin_lock_init(*handle);
 
         return AE_OK;
 }
 
 /*
  * Deallocate the memory for a spinlock.
  */
 void acpi_os_delete_lock(acpi_spinlock handle)
 {
         return;
 }
 
 acpi_status
 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 {
         struct semaphore *sem = NULL;
 
         sem = acpi_os_allocate(sizeof(struct semaphore));
         if (!sem)
                 return AE_NO_MEMORY;
         memset(sem, 0, sizeof(struct semaphore));
 
         sema_init(sem, initial_units);
 
         *handle = (acpi_handle *) sem;
 
         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
                           *handle, initial_units));
 
         return AE_OK;
 }
 
 /*
  * TODO: A better way to delete semaphores?  Linux doesn't have a
  * 'delete_semaphore()' function -- may result in an invalid
  * pointer dereference for non-synchronized consumers.        Should
  * we at least check for blocked threads and signal/cancel them?
  */
 
 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 {
         struct semaphore *sem = (struct semaphore *)handle;
 
         if (!sem)
                 return AE_BAD_PARAMETER;
 
         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 
         BUG_ON(!list_empty(&sem->wait_list));
         kfree(sem);
         sem = NULL;
 
         return AE_OK;
 }
 
 /*
  * TODO: Support for units > 1?
  */
 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 {
         acpi_status status = AE_OK;
         struct semaphore *sem = (struct semaphore *)handle;
         long jiffies;
         int ret = 0;
 
         if (!sem || (units < 1))
                 return AE_BAD_PARAMETER;
 
         if (units > 1)
                 return AE_SUPPORT;
 
         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
                           handle, units, timeout));
 
         if (timeout == ACPI_WAIT_FOREVER)
                 jiffies = MAX_SCHEDULE_TIMEOUT;
         else
                 jiffies = msecs_to_jiffies(timeout);
         
         ret = down_timeout(sem, jiffies);
         if (ret)
                 status = AE_TIME;
 
         if (ACPI_FAILURE(status)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
                                   "Failed to acquire semaphore[%p|%d|%d], %s",
                                   handle, units, timeout,
                                   acpi_format_exception(status)));
         } else {
                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
                                   "Acquired semaphore[%p|%d|%d]", handle,
                                   units, timeout));
         }
 
         return status;
 }
 
 /*
  * TODO: Support for units > 1?
  */
 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 {
         struct semaphore *sem = (struct semaphore *)handle;
 
         if (!sem || (units < 1))
                 return AE_BAD_PARAMETER;
 
         if (units > 1)
                 return AE_SUPPORT;
 
         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
                           units));
 
         up(sem);
 
         return AE_OK;
 }
 
 #ifdef ACPI_FUTURE_USAGE
 u32 acpi_os_get_line(char *buffer)
 {
 
 #ifdef ENABLE_DEBUGGER
         if (acpi_in_debugger) {
                 u32 chars;
 
                 kdb_read(buffer, sizeof(line_buf));
 
                 /* remove the CR kdb includes */
                 chars = strlen(buffer) - 1;
                 buffer[chars] = '\0';
         }
 #endif
 
         return 0;
 }
 #endif                                /*  ACPI_FUTURE_USAGE  */
 
 acpi_status acpi_os_signal(u32 function, void *info)
 {
         switch (function) {
         case ACPI_SIGNAL_FATAL:
                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
                 break;
         case ACPI_SIGNAL_BREAKPOINT:
                 /*
                  * AML Breakpoint
                  * ACPI spec. says to treat it as a NOP unless
                  * you are debugging.  So if/when we integrate
                  * AML debugger into the kernel debugger its
                  * hook will go here.  But until then it is
                  * not useful to print anything on breakpoints.
                  */
                 break;
         default:
                 break;
         }
 
         return AE_OK;
 }
 
 static int __init acpi_os_name_setup(char *str)
 {
         char *p = acpi_os_name;
         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 
         if (!str || !*str)
                 return 0;
 
         for (; count-- && str && *str; str++) {
                 if (isalnum(*str) || *str == ' ' || *str == ':')
                         *p++ = *str;
                 else if (*str == '\'' || *str == '"')
                         continue;
                 else
                         break;
         }
         *p = 0;
 
         return 1;
 
 }
 
 __setup("acpi_os_name=", acpi_os_name_setup);
 
 static void __init set_osi_linux(unsigned int enable)
 {
         if (osi_linux.enable != enable) {
                 osi_linux.enable = enable;
                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
                         enable ? "Add": "Delet");
         }
         return;
 }
 
 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 {
         osi_linux.cmdline = 1;        /* cmdline set the default */
         set_osi_linux(enable);
 
         return;
 }
 
 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
 {
         osi_linux.dmi = 1;        /* DMI knows that this box asks OSI(Linux) */
 
         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
 
         if (enable == -1)
                 return;
 
         osi_linux.known = 1;        /* DMI knows which OSI(Linux) default needed */
 
         set_osi_linux(enable);
 
         return;
 }
 
 /*
 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 *
 * empty string disables _OSI
 * string starting with '!' disables that string
 * otherwise string is added to list, augmenting built-in strings
 */
int __init acpi_osi_setup(char *str)
{
        if (str == NULL || *str == '\0') {
                printk(KERN_INFO PREFIX "_OSI method disabled\n");
                acpi_gbl_create_osi_method = FALSE;
        } else if (!strcmp("!Linux", str)) {
                acpi_cmdline_osi_linux(0);        /* !enable */
        } else if (*str == '!') {
                if (acpi_osi_invalidate(++str) == AE_OK)
                        printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
        } else if (!strcmp("Linux", str)) {
                acpi_cmdline_osi_linux(1);        /* enable */
        } else if (*osi_additional_string == '\0') {
                strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
                printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
        }

        return 1;
}

__setup("acpi_osi=", acpi_osi_setup);

/* enable serialization to combat AE_ALREADY_EXISTS errors */
static int __init acpi_serialize_setup(char *str)
{
        printk(KERN_INFO PREFIX "serialize enabled\n");

        acpi_gbl_all_methods_serialized = TRUE;

        return 1;
}

__setup("acpi_serialize", acpi_serialize_setup);

/*
 * Wake and Run-Time GPES are expected to be separate.
 * We disable wake-GPEs at run-time to prevent spurious
 * interrupts.
 *
 * However, if a system exists that shares Wake and
 * Run-time events on the same GPE this flag is available
 * to tell Linux to keep the wake-time GPEs enabled at run-time.
 */
static int __init acpi_wake_gpes_always_on_setup(char *str)
{
        printk(KERN_INFO PREFIX "wake GPEs not disabled\n");

        acpi_gbl_leave_wake_gpes_disabled = FALSE;

        return 1;
}

__setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);

/* Check of resource interference between native drivers and ACPI
 * OperationRegions (SystemIO and System Memory only).
 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
 * in arbitrary AML code and can interfere with legacy drivers.
 * acpi_enforce_resources= can be set to:
 *
 *   - strict           (2)
 *     -> further driver trying to access the resources will not load
 *   - lax (default)    (1)
 *     -> further driver trying to access the resources will load, but you
 *     get a system message that something might go wrong...
 *
 *   - no               (0)
 *     -> ACPI Operation Region resources will not be registered
 *
 */
#define ENFORCE_RESOURCES_STRICT 2
#define ENFORCE_RESOURCES_LAX    1
#define ENFORCE_RESOURCES_NO     0

static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;

static int __init acpi_enforce_resources_setup(char *str)
{
        if (str == NULL || *str == '\0')
                return 0;

        if (!strcmp("strict", str))
                acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
        else if (!strcmp("lax", str))
                acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
        else if (!strcmp("no", str))
                acpi_enforce_resources = ENFORCE_RESOURCES_NO;

        return 1;
}

__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);

/* Check for resource conflicts between ACPI OperationRegions and native
 * drivers */
int acpi_check_resource_conflict(struct resource *res)
{
        struct acpi_res_list *res_list_elem;
        int ioport;
        int clash = 0;

        if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
                return 0;
        if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
                return 0;

        ioport = res->flags & IORESOURCE_IO;

        spin_lock(&acpi_res_lock);
        list_for_each_entry(res_list_elem, &resource_list_head,
                            resource_list) {
                if (ioport && (res_list_elem->resource_type
                               != ACPI_ADR_SPACE_SYSTEM_IO))
                        continue;
                if (!ioport && (res_list_elem->resource_type
                                != ACPI_ADR_SPACE_SYSTEM_MEMORY))
                        continue;

                if (res->end < res_list_elem->start
                    || res_list_elem->end < res->start)
                        continue;
                clash = 1;
                break;
        }
        spin_unlock(&acpi_res_lock);

        if (clash) {
                if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
                        printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
                               " conflicts with ACPI region %s"
                               " [0x%llx-0x%llx]\n",
                               acpi_enforce_resources == ENFORCE_RESOURCES_LAX
                               ? KERN_WARNING : KERN_ERR,
                               ioport ? "I/O" : "Memory", res->name,
                               (long long) res->start, (long long) res->end,
                               res_list_elem->name,
                               (long long) res_list_elem->start,
                               (long long) res_list_elem->end);
                        printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
                }
                if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
                        return -EBUSY;
        }
        return 0;
}
EXPORT_SYMBOL(acpi_check_resource_conflict);

int acpi_check_region(resource_size_t start, resource_size_t n,
                      const char *name)
{
        struct resource res = {
                .start = start,
                .end   = start + n - 1,
                .name  = name,
                .flags = IORESOURCE_IO,
        };

        return acpi_check_resource_conflict(&res);
}
EXPORT_SYMBOL(acpi_check_region);

int acpi_check_mem_region(resource_size_t start, resource_size_t n,
                      const char *name)
{
        struct resource res = {
                .start = start,
                .end   = start + n - 1,
                .name  = name,
                .flags = IORESOURCE_MEM,
        };

        return acpi_check_resource_conflict(&res);

}
EXPORT_SYMBOL(acpi_check_mem_region);

/*
 * Acquire a spinlock.
 *
 * handle is a pointer to the spinlock_t.
 */

acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
{
        acpi_cpu_flags flags;
        spin_lock_irqsave(lockp, flags);
        return flags;
}

/*
 * Release a spinlock. See above.
 */

void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
{
        spin_unlock_irqrestore(lockp, flags);
}

#ifndef ACPI_USE_LOCAL_CACHE

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_create_cache
 *
 * PARAMETERS:  name      - Ascii name for the cache
 *              size      - Size of each cached object
 *              depth     - Maximum depth of the cache (in objects) <ignored>
 *              cache     - Where the new cache object is returned
 *
 * RETURN:      status
 *
 * DESCRIPTION: Create a cache object
 *
 ******************************************************************************/

acpi_status
acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
{
        *cache = kmem_cache_create(name, size, 0, 0, NULL);
        if (*cache == NULL)
                return AE_ERROR;
        else
                return AE_OK;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_purge_cache
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache.
 *
 ******************************************************************************/

acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
{
        kmem_cache_shrink(cache);
        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_delete_cache
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache and delete the
 *              cache object.
 *
 ******************************************************************************/

acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
{
        kmem_cache_destroy(cache);
        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_release_object
 *
 * PARAMETERS:  Cache       - Handle to cache object
 *              Object      - The object to be released
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release an object to the specified cache.  If cache is full,
 *              the object is deleted.
 *
 ******************************************************************************/

acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
{
        kmem_cache_free(cache, object);
        return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_os_validate_interface
 *
 * PARAMETERS:  interface           - Requested interface to be validated
 *
 * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
 *
 * DESCRIPTION: Match an interface string to the interfaces supported by the
 *              host. Strings originate from an AML call to the _OSI method.
 *
 *****************************************************************************/

acpi_status
acpi_os_validate_interface (char *interface)
{
        if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
                return AE_OK;
        if (!strcmp("Linux", interface)) {

                printk(KERN_NOTICE PREFIX
                        "BIOS _OSI(Linux) query %s%s\n",
                        osi_linux.enable ? "honored" : "ignored",
                        osi_linux.cmdline ? " via cmdline" :
                        osi_linux.dmi ? " via DMI" : "");

                if (osi_linux.enable)
                        return AE_OK;
        }
        return AE_SUPPORT;
}

/******************************************************************************
 *
 * FUNCTION:    acpi_os_validate_address
 *
 * PARAMETERS:  space_id             - ACPI space ID
 *              address             - Physical address
 *              length              - Address length
 *
 * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
 *              should return AE_AML_ILLEGAL_ADDRESS.
 *
 * DESCRIPTION: Validate a system address via the host OS. Used to validate
 *              the addresses accessed by AML operation regions.
 *
 *****************************************************************************/

acpi_status
acpi_os_validate_address (
    u8                   space_id,
    acpi_physical_address   address,
    acpi_size               length,
    char *name)
{
        struct acpi_res_list *res;
        if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
                return AE_OK;

        switch (space_id) {
        case ACPI_ADR_SPACE_SYSTEM_IO:
        case ACPI_ADR_SPACE_SYSTEM_MEMORY:
                /* Only interference checks against SystemIO and SytemMemory
                   are needed */
                res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
                if (!res)
                        return AE_OK;
                /* ACPI names are fixed to 4 bytes, still better use strlcpy */
                strlcpy(res->name, name, 5);
                res->start = address;
                res->end = address + length - 1;
                res->resource_type = space_id;
                spin_lock(&acpi_res_lock);
                list_add(&res->resource_list, &resource_list_head);
                spin_unlock(&acpi_res_lock);
                pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
                         "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
                         ? "SystemIO" : "System Memory",
                         (unsigned long long)res->start,
                         (unsigned long long)res->end,
                         res->name);
                break;
        case ACPI_ADR_SPACE_PCI_CONFIG:
        case ACPI_ADR_SPACE_EC:
        case ACPI_ADR_SPACE_SMBUS:
        case ACPI_ADR_SPACE_CMOS:
        case ACPI_ADR_SPACE_PCI_BAR_TARGET:
        case ACPI_ADR_SPACE_DATA_TABLE:
        case ACPI_ADR_SPACE_FIXED_HARDWARE:
                break;
        }
        return AE_OK;
}

#endif