ClabureDB: Classified Bug-Reports Database

   /*
    *  Copyright (C) 1995  Linus Torvalds
    *
    *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
    *
    *  Memory region support
    *        David Parsons <orc@pell.chi.il.us>, July-August 1999
    *
    *  Added E820 sanitization routine (removes overlapping memory regions);
   *  Brian Moyle <bmoyle@mvista.com>, February 2001
   *
   * Moved CPU detection code to cpu/${cpu}.c
   *    Patrick Mochel <mochel@osdl.org>, March 2002
   *
   *  Provisions for empty E820 memory regions (reported by certain BIOSes).
   *  Alex Achenbach <xela@slit.de>, December 2002.
   *
   */
  
  /*
   * This file handles the architecture-dependent parts of initialization
   */
  
  #include <linux/sched.h>
  #include <linux/mm.h>
  #include <linux/mmzone.h>
  #include <linux/screen_info.h>
  #include <linux/ioport.h>
  #include <linux/acpi.h>
  #include <linux/apm_bios.h>
  #include <linux/initrd.h>
  #include <linux/bootmem.h>
  #include <linux/seq_file.h>
  #include <linux/console.h>
  #include <linux/mca.h>
  #include <linux/root_dev.h>
  #include <linux/highmem.h>
  #include <linux/module.h>
  #include <linux/efi.h>
  #include <linux/init.h>
  #include <linux/edd.h>
  #include <linux/iscsi_ibft.h>
  #include <linux/nodemask.h>
  #include <linux/kexec.h>
  #include <linux/dmi.h>
  #include <linux/pfn.h>
  #include <linux/pci.h>
  #include <asm/pci-direct.h>
  #include <linux/init_ohci1394_dma.h>
  #include <linux/kvm_para.h>
  
  #include <linux/errno.h>
  #include <linux/kernel.h>
  #include <linux/stddef.h>
  #include <linux/unistd.h>
  #include <linux/ptrace.h>
  #include <linux/slab.h>
  #include <linux/user.h>
  #include <linux/delay.h>
  
  #include <linux/kallsyms.h>
  #include <linux/cpufreq.h>
  #include <linux/dma-mapping.h>
  #include <linux/ctype.h>
  #include <linux/uaccess.h>
  
  #include <linux/percpu.h>
  #include <linux/crash_dump.h>
  
  #include <video/edid.h>
  
  #include <asm/mtrr.h>
  #include <asm/apic.h>
  #include <asm/e820.h>
  #include <asm/mpspec.h>
  #include <asm/setup.h>
  #include <asm/arch_hooks.h>
  #include <asm/efi.h>
  #include <asm/sections.h>
  #include <asm/dmi.h>
  #include <asm/io_apic.h>
  #include <asm/ist.h>
  #include <asm/vmi.h>
  #include <setup_arch.h>
  #include <asm/bios_ebda.h>
  #include <asm/cacheflush.h>
  #include <asm/processor.h>
  #include <asm/bugs.h>
  
  #include <asm/system.h>
  #include <asm/vsyscall.h>
  #include <asm/smp.h>
  #include <asm/desc.h>
  #include <asm/dma.h>
  #include <asm/iommu.h>
  #include <asm/mmu_context.h>
  #include <asm/proto.h>
  
  #include <mach_apic.h>
 #include <asm/paravirt.h>
 
 #include <asm/percpu.h>
 #include <asm/topology.h>
 #include <asm/apicdef.h>
 #ifdef CONFIG_X86_64
 #include <asm/numa_64.h>
 #endif
 
 #ifndef ARCH_SETUP
 #define ARCH_SETUP
 #endif
 
 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 struct boot_params __initdata boot_params;
 #else
 struct boot_params boot_params;
 #endif
 
 /*
  * Machine setup..
  */
 static struct resource data_resource = {
         .name        = "Kernel data",
         .start        = 0,
         .end        = 0,
         .flags        = IORESOURCE_BUSY | IORESOURCE_MEM
 };
 
 static struct resource code_resource = {
         .name        = "Kernel code",
         .start        = 0,
         .end        = 0,
         .flags        = IORESOURCE_BUSY | IORESOURCE_MEM
 };
 
 static struct resource bss_resource = {
         .name        = "Kernel bss",
         .start        = 0,
         .end        = 0,
         .flags        = IORESOURCE_BUSY | IORESOURCE_MEM
 };
 
 
 #ifdef CONFIG_X86_32
 /* This value is set up by the early boot code to point to the value
    immediately after the boot time page tables.  It contains a *physical*
    address, and must not be in the .bss segment! */
 unsigned long init_pg_tables_start __initdata = ~0UL;
 unsigned long init_pg_tables_end __initdata = ~0UL;
 
 static struct resource video_ram_resource = {
         .name        = "Video RAM area",
         .start        = 0xa0000,
         .end        = 0xbffff,
         .flags        = IORESOURCE_BUSY | IORESOURCE_MEM
 };
 
 /* cpu data as detected by the assembly code in head.S */
 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 /* common cpu data for all cpus */
 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 EXPORT_SYMBOL(boot_cpu_data);
 static void set_mca_bus(int x)
 {
 #ifdef CONFIG_MCA
         MCA_bus = x;
 #endif
 }
 
 unsigned int def_to_bigsmp;
 
 /* for MCA, but anyone else can use it if they want */
 unsigned int machine_id;
 unsigned int machine_submodel_id;
 unsigned int BIOS_revision;
 
 struct apm_info apm_info;
 EXPORT_SYMBOL(apm_info);
 
 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 struct ist_info ist_info;
 EXPORT_SYMBOL(ist_info);
 #else
 struct ist_info ist_info;
 #endif
 
 #else
 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 EXPORT_SYMBOL(boot_cpu_data);
 #endif
 
 
 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 unsigned long mmu_cr4_features;
 #else
 unsigned long mmu_cr4_features = X86_CR4_PAE;
 #endif
 
 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 int bootloader_type;
 
 /*
  * Early DMI memory
  */
 int dmi_alloc_index;
 char dmi_alloc_data[DMI_MAX_DATA];
 
 /*
  * Setup options
  */
 struct screen_info screen_info;
 EXPORT_SYMBOL(screen_info);
 struct edid_info edid_info;
 EXPORT_SYMBOL_GPL(edid_info);
 
 extern int root_mountflags;
 
 unsigned long saved_video_mode;
 
 #define RAMDISK_IMAGE_START_MASK        0x07FF
 #define RAMDISK_PROMPT_FLAG                0x8000
 #define RAMDISK_LOAD_FLAG                0x4000
 
 static char __initdata command_line[COMMAND_LINE_SIZE];
 #ifdef CONFIG_CMDLINE_BOOL
 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 #endif
 
 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 struct edd edd;
 #ifdef CONFIG_EDD_MODULE
 EXPORT_SYMBOL(edd);
 #endif
 /**
  * copy_edd() - Copy the BIOS EDD information
  *              from boot_params into a safe place.
  *
  */
 static inline void copy_edd(void)
 {
      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
             sizeof(edd.mbr_signature));
      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
      edd.edd_info_nr = boot_params.eddbuf_entries;
 }
 #else
 static inline void copy_edd(void)
 {
 }
 #endif
 
 #ifdef CONFIG_BLK_DEV_INITRD
 
 #ifdef CONFIG_X86_32
 
 #define MAX_MAP_CHUNK        (NR_FIX_BTMAPS << PAGE_SHIFT)
 static void __init relocate_initrd(void)
 {
 
         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
         u64 ramdisk_here;
         unsigned long slop, clen, mapaddr;
         char *p, *q;
 
         /* We need to move the initrd down into lowmem */
         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
                                          PAGE_SIZE);
 
         if (ramdisk_here == -1ULL)
                 panic("Cannot find place for new RAMDISK of size %lld\n",
                          ramdisk_size);
 
         /* Note: this includes all the lowmem currently occupied by
            the initrd, we rely on that fact to keep the data intact. */
         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
                          "NEW RAMDISK");
         initrd_start = ramdisk_here + PAGE_OFFSET;
         initrd_end   = initrd_start + ramdisk_size;
         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
                          ramdisk_here, ramdisk_here + ramdisk_size);
 
         q = (char *)initrd_start;
 
         /* Copy any lowmem portion of the initrd */
         if (ramdisk_image < end_of_lowmem) {
                 clen = end_of_lowmem - ramdisk_image;
                 p = (char *)__va(ramdisk_image);
                 memcpy(q, p, clen);
                 q += clen;
                 ramdisk_image += clen;
                 ramdisk_size  -= clen;
         }
 
         /* Copy the highmem portion of the initrd */
         while (ramdisk_size) {
                 slop = ramdisk_image & ~PAGE_MASK;
                 clen = ramdisk_size;
                 if (clen > MAX_MAP_CHUNK-slop)
                         clen = MAX_MAP_CHUNK-slop;
                 mapaddr = ramdisk_image & PAGE_MASK;
                 p = early_memremap(mapaddr, clen+slop);
                 memcpy(q, p+slop, clen);
                 early_iounmap(p, clen+slop);
                 q += clen;
                 ramdisk_image += clen;
                 ramdisk_size  -= clen;
         }
         /* high pages is not converted by early_res_to_bootmem */
         ramdisk_image = boot_params.hdr.ramdisk_image;
         ramdisk_size  = boot_params.hdr.ramdisk_size;
         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
                 " %08llx - %08llx\n",
                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 }
 #endif
 
 static void __init reserve_initrd(void)
 {
         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 
         if (!boot_params.hdr.type_of_loader ||
             !ramdisk_image || !ramdisk_size)
                 return;                /* No initrd provided by bootloader */
 
         initrd_start = 0;
 
         if (ramdisk_size >= (end_of_lowmem>>1)) {
                 free_early(ramdisk_image, ramdisk_end);
                 printk(KERN_ERR "initrd too large to handle, "
                        "disabling initrd\n");
                 return;
         }
 
         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
                         ramdisk_end);
 
 
         if (ramdisk_end <= end_of_lowmem) {
                 /* All in lowmem, easy case */
                 /*
                  * don't need to reserve again, already reserved early
                  * in i386_start_kernel
                  */
                 initrd_start = ramdisk_image + PAGE_OFFSET;
                 initrd_end = initrd_start + ramdisk_size;
                 return;
         }
 
 #ifdef CONFIG_X86_32
         relocate_initrd();
 #else
         printk(KERN_ERR "initrd extends beyond end of memory "
                "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
                ramdisk_end, end_of_lowmem);
         initrd_start = 0;
 #endif
         free_early(ramdisk_image, ramdisk_end);
 }
 #else
 static void __init reserve_initrd(void)
 {
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
 static void __init parse_setup_data(void)
 {
         struct setup_data *data;
         u64 pa_data;
 
         if (boot_params.hdr.version < 0x0209)
                 return;
         pa_data = boot_params.hdr.setup_data;
         while (pa_data) {
                 data = early_memremap(pa_data, PAGE_SIZE);
                 switch (data->type) {
                 case SETUP_E820_EXT:
                         parse_e820_ext(data, pa_data);
                         break;
                 default:
                         break;
                 }
                 pa_data = data->next;
                 early_iounmap(data, PAGE_SIZE);
         }
 }
 
 static void __init e820_reserve_setup_data(void)
 {
         struct setup_data *data;
         u64 pa_data;
         int found = 0;
 
         if (boot_params.hdr.version < 0x0209)
                 return;
         pa_data = boot_params.hdr.setup_data;
         while (pa_data) {
                 data = early_memremap(pa_data, sizeof(*data));
                 e820_update_range(pa_data, sizeof(*data)+data->len,
                          E820_RAM, E820_RESERVED_KERN);
                 found = 1;
                 pa_data = data->next;
                 early_iounmap(data, sizeof(*data));
         }
         if (!found)
                 return;
 
         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
         memcpy(&e820_saved, &e820, sizeof(struct e820map));
         printk(KERN_INFO "extended physical RAM map:\n");
         e820_print_map("reserve setup_data");
 }
 
 static void __init reserve_early_setup_data(void)
 {
         struct setup_data *data;
         u64 pa_data;
         char buf[32];
 
         if (boot_params.hdr.version < 0x0209)
                 return;
         pa_data = boot_params.hdr.setup_data;
         while (pa_data) {
                 data = early_memremap(pa_data, sizeof(*data));
                 sprintf(buf, "setup data %x", data->type);
                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
                 pa_data = data->next;
                 early_iounmap(data, sizeof(*data));
         }
 }
 
 /*
  * --------- Crashkernel reservation ------------------------------
  */
 
 #ifdef CONFIG_KEXEC
 
 /**
  * Reserve @size bytes of crashkernel memory at any suitable offset.
  *
  * @size: Size of the crashkernel memory to reserve.
  * Returns the base address on success, and -1ULL on failure.
  */
 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 {
         const unsigned long long alignment = 16<<20;         /* 16M */
         unsigned long long start = 0LL;
 
         while (1) {
                 int ret;
 
                 start = find_e820_area(start, ULONG_MAX, size, alignment);
                 if (start == -1ULL)
                         return start;
 
                 /* try to reserve it */
                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
                 if (ret >= 0)
                         return start;
 
                 start += alignment;
         }
 }
 
 static inline unsigned long long get_total_mem(void)
 {
         unsigned long long total;
 
         total = max_low_pfn - min_low_pfn;
 #ifdef CONFIG_HIGHMEM
         total += highend_pfn - highstart_pfn;
 #endif
 
         return total << PAGE_SHIFT;
 }
 
 static void __init reserve_crashkernel(void)
 {
         unsigned long long total_mem;
         unsigned long long crash_size, crash_base;
         int ret;
 
         total_mem = get_total_mem();
 
         ret = parse_crashkernel(boot_command_line, total_mem,
                         &crash_size, &crash_base);
         if (ret != 0 || crash_size <= 0)
                 return;
 
         /* 0 means: find the address automatically */
         if (crash_base <= 0) {
                 crash_base = find_and_reserve_crashkernel(crash_size);
                 if (crash_base == -1ULL) {
                         pr_info("crashkernel reservation failed. "
                                 "No suitable area found.\n");
                         return;
                 }
         } else {
                 ret = reserve_bootmem_generic(crash_base, crash_size,
                                         BOOTMEM_EXCLUSIVE);
                 if (ret < 0) {
                         pr_info("crashkernel reservation failed - "
                                 "memory is in use\n");
                         return;
                 }
         }
 
         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
                         "for crashkernel (System RAM: %ldMB)\n",
                         (unsigned long)(crash_size >> 20),
                         (unsigned long)(crash_base >> 20),
                         (unsigned long)(total_mem >> 20));
 
         crashk_res.start = crash_base;
         crashk_res.end   = crash_base + crash_size - 1;
         insert_resource(&iomem_resource, &crashk_res);
 }
 #else
 static void __init reserve_crashkernel(void)
 {
 }
 #endif
 
 static struct resource standard_io_resources[] = {
         { .name = "dma1", .start = 0x00, .end = 0x1f,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "pic1", .start = 0x20, .end = 0x21,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "timer0", .start = 0x40, .end = 0x43,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "timer1", .start = 0x50, .end = 0x53,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "keyboard", .start = 0x60, .end = 0x60,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "keyboard", .start = 0x64, .end = 0x64,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "pic2", .start = 0xa0, .end = 0xa1,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "dma2", .start = 0xc0, .end = 0xdf,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "fpu", .start = 0xf0, .end = 0xff,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 };
 
 static void __init reserve_standard_io_resources(void)
 {
         int i;
 
         /* request I/O space for devices used on all i[345]86 PCs */
         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
                 request_resource(&ioport_resource, &standard_io_resources[i]);
 
 }
 
 /*
  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
  * is_kdump_kernel() to determine if we are booting after a panic. Hence
  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
  */
 
 #ifdef CONFIG_CRASH_DUMP
 /* elfcorehdr= specifies the location of elf core header
  * stored by the crashed kernel. This option will be passed
  * by kexec loader to the capture kernel.
  */
 static int __init setup_elfcorehdr(char *arg)
 {
         char *end;
         if (!arg)
                 return -EINVAL;
         elfcorehdr_addr = memparse(arg, &end);
         return end > arg ? 0 : -EINVAL;
 }
 early_param("elfcorehdr", setup_elfcorehdr);
 #endif
 
 static struct x86_quirks default_x86_quirks __initdata;
 
 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 
 /*
  * Some BIOSes seem to corrupt the low 64k of memory during events
  * like suspend/resume and unplugging an HDMI cable.  Reserve all
  * remaining free memory in that area and fill it with a distinct
  * pattern.
  */
 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 #define MAX_SCAN_AREAS        8
 
 static int __read_mostly memory_corruption_check = -1;
 
 static unsigned __read_mostly corruption_check_size = 64*1024;
 static unsigned __read_mostly corruption_check_period = 60; /* seconds */
 
 static struct e820entry scan_areas[MAX_SCAN_AREAS];
 static int num_scan_areas;
 
 
 static int set_corruption_check(char *arg)
 {
         char *end;
 
         memory_corruption_check = simple_strtol(arg, &end, 10);
 
         return (*end == 0) ? 0 : -EINVAL;
 }
 early_param("memory_corruption_check", set_corruption_check);
 
 static int set_corruption_check_period(char *arg)
 {
         char *end;
 
         corruption_check_period = simple_strtoul(arg, &end, 10);
 
         return (*end == 0) ? 0 : -EINVAL;
 }
 early_param("memory_corruption_check_period", set_corruption_check_period);
 
 static int set_corruption_check_size(char *arg)
 {
         char *end;
         unsigned size;
 
         size = memparse(arg, &end);
 
         if (*end == '\0')
                 corruption_check_size = size;
 
         return (size == corruption_check_size) ? 0 : -EINVAL;
 }
 early_param("memory_corruption_check_size", set_corruption_check_size);
 
 
 static void __init setup_bios_corruption_check(void)
 {
         u64 addr = PAGE_SIZE;        /* assume first page is reserved anyway */
 
         if (memory_corruption_check == -1) {
                 memory_corruption_check =
 #ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
                         1
 #else
                         0
 #endif
                         ;
         }
 
         if (corruption_check_size == 0)
                 memory_corruption_check = 0;
 
         if (!memory_corruption_check)
                 return;
 
         corruption_check_size = round_up(corruption_check_size, PAGE_SIZE);
 
         while(addr < corruption_check_size && num_scan_areas < MAX_SCAN_AREAS) {
                 u64 size;
                 addr = find_e820_area_size(addr, &size, PAGE_SIZE);
 
                 if (addr == 0)
                         break;
 
                 if ((addr + size) > corruption_check_size)
                         size = corruption_check_size - addr;
 
                 if (size == 0)
                         break;
 
                 e820_update_range(addr, size, E820_RAM, E820_RESERVED);
                 scan_areas[num_scan_areas].addr = addr;
                 scan_areas[num_scan_areas].size = size;
                 num_scan_areas++;
 
                 /* Assume we've already mapped this early memory */
                 memset(__va(addr), 0, size);
 
                 addr += size;
         }
 
         printk(KERN_INFO "Scanning %d areas for low memory corruption\n",
                num_scan_areas);
         update_e820();
 }
 
 static struct timer_list periodic_check_timer;
 
 void check_for_bios_corruption(void)
 {
         int i;
         int corruption = 0;
 
         if (!memory_corruption_check)
                 return;
 
         for(i = 0; i < num_scan_areas; i++) {
                 unsigned long *addr = __va(scan_areas[i].addr);
                 unsigned long size = scan_areas[i].size;
 
                 for(; size; addr++, size -= sizeof(unsigned long)) {
                         if (!*addr)
                                 continue;
                         printk(KERN_ERR "Corrupted low memory at %p (%lx phys) = %08lx\n",
                                addr, __pa(addr), *addr);
                         corruption = 1;
                         *addr = 0;
                 }
         }
 
         WARN(corruption, KERN_ERR "Memory corruption detected in low memory\n");
 }
 
 static void periodic_check_for_corruption(unsigned long data)
 {
         check_for_bios_corruption();
         mod_timer(&periodic_check_timer, round_jiffies(jiffies + corruption_check_period*HZ));
 }
 
 void start_periodic_check_for_corruption(void)
 {
         if (!memory_corruption_check || corruption_check_period == 0)
                 return;
 
         printk(KERN_INFO "Scanning for low memory corruption every %d seconds\n",
                corruption_check_period);
 
         init_timer(&periodic_check_timer);
         periodic_check_timer.function = &periodic_check_for_corruption;
         periodic_check_for_corruption(0);
 }
 #endif
 
 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 {
         printk(KERN_NOTICE
                 "%s detected: BIOS may corrupt low RAM, working it around.\n",
                 d->ident);
 
         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 
         return 0;
 }
 
 /* List of systems that have known low memory corruption BIOS problems */
 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 #ifdef CONFIG_X86_RESERVE_LOW_64K
         {
                 .callback = dmi_low_memory_corruption,
                 .ident = "AMI BIOS",
                 .matches = {
                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
                 },
         },
         {
                 .callback = dmi_low_memory_corruption,
                 .ident = "Phoenix BIOS",
                 .matches = {
                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
                 },
         },
 #endif
         {}
 };
 
 /*
  * Determine if we were loaded by an EFI loader.  If so, then we have also been
  * passed the efi memmap, systab, etc., so we should use these data structures
  * for initialization.  Note, the efi init code path is determined by the
  * global efi_enabled. This allows the same kernel image to be used on existing
  * systems (with a traditional BIOS) as well as on EFI systems.
  */
 /*
  * setup_arch - architecture-specific boot-time initializations
  *
  * Note: On x86_64, fixmaps are ready for use even before this is called.
  */
 
 void __init setup_arch(char **cmdline_p)
 {
 #ifdef CONFIG_X86_32
         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
         visws_early_detect();
         pre_setup_arch_hook();
 #else
         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 #endif
 
         /* VMI may relocate the fixmap; do this before touching ioremap area */
         vmi_init();
 
         early_cpu_init();
         early_ioremap_init();
 
         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
         screen_info = boot_params.screen_info;
         edid_info = boot_params.edid_info;
 #ifdef CONFIG_X86_32
         apm_info.bios = boot_params.apm_bios_info;
         ist_info = boot_params.ist_info;
         if (boot_params.sys_desc_table.length != 0) {
                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
                 machine_id = boot_params.sys_desc_table.table[0];
                 machine_submodel_id = boot_params.sys_desc_table.table[1];
                 BIOS_revision = boot_params.sys_desc_table.table[2];
         }
 #endif
         saved_video_mode = boot_params.hdr.vid_mode;
         bootloader_type = boot_params.hdr.type_of_loader;
 
 #ifdef CONFIG_BLK_DEV_RAM
         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 #endif
 #ifdef CONFIG_EFI
         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 #ifdef CONFIG_X86_32
                      "EL32",
 #else
                      "EL64",
 #endif
          4)) {
                 efi_enabled = 1;
                 efi_reserve_early();
         }
 #endif
 
         ARCH_SETUP
 
         setup_memory_map();
         parse_setup_data();
         /* update the e820_saved too */
         e820_reserve_setup_data();
 
         copy_edd();
 
         if (!boot_params.hdr.root_flags)
                 root_mountflags &= ~MS_RDONLY;
         init_mm.start_code = (unsigned long) _text;
         init_mm.end_code = (unsigned long) _etext;
         init_mm.end_data = (unsigned long) _edata;
 #ifdef CONFIG_X86_32
         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 #else
         init_mm.brk = (unsigned long) &_end;
 #endif
 
         code_resource.start = virt_to_phys(_text);
         code_resource.end = virt_to_phys(_etext)-1;
         data_resource.start = virt_to_phys(_etext);
         data_resource.end = virt_to_phys(_edata)-1;
         bss_resource.start = virt_to_phys(&__bss_start);
         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 
 #ifdef CONFIG_CMDLINE_BOOL
 #ifdef CONFIG_CMDLINE_OVERRIDE
         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 #else
         if (builtin_cmdline[0]) {
                 /* append boot loader cmdline to builtin */
                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
         }
 #endif
 #endif
 
         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
         *cmdline_p = command_line;
 
         parse_early_param();
 
 #ifdef CONFIG_X86_64
         check_efer();
 #endif
 
         /* Must be before kernel pagetables are setup */
         vmi_activate();
 
         /* after early param, so could get panic from serial */
         reserve_early_setup_data();
 
         if (acpi_mps_check()) {
 #ifdef CONFIG_X86_LOCAL_APIC
                 disable_apic = 1;
 #endif
                 setup_clear_cpu_cap(X86_FEATURE_APIC);
         }
 
 #ifdef CONFIG_PCI
         if (pci_early_dump_regs)
                 early_dump_pci_devices();
 #endif
 
         finish_e820_parsing();
 
         dmi_scan_machine();
 
         dmi_check_system(bad_bios_dmi_table);
 
 #ifdef CONFIG_X86_32
         probe_roms();
 #endif
 
         /* after parse_early_param, so could debug it */
         insert_resource(&iomem_resource, &code_resource);
         insert_resource(&iomem_resource, &data_resource);
         insert_resource(&iomem_resource, &bss_resource);
 
         if (efi_enabled)
                 efi_init();
 
 #ifdef CONFIG_X86_32
         if (ppro_with_ram_bug()) {
                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
                                   E820_RESERVED);
                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
                 printk(KERN_INFO "fixed physical RAM map:\n");
                 e820_print_map("bad_ppro");
         }
 #else
         early_gart_iommu_check();
 #endif
 
         /*
          * partially used pages are not usable - thus
          * we are rounding upwards:
          */
         max_pfn = e820_end_of_ram_pfn();
 
         /* preallocate 4k for mptable mpc */
         early_reserve_e820_mpc_new();
         /* update e820 for memory not covered by WB MTRRs */
         mtrr_bp_init();
         if (mtrr_trim_uncached_memory(max_pfn))
                 max_pfn = e820_end_of_ram_pfn();
 
 #ifdef CONFIG_X86_32
         /* max_low_pfn get updated here */
         find_low_pfn_range();
 #else
         num_physpages = max_pfn;
 
          if (cpu_has_x2apic)
                  check_x2apic();
 
         /* How many end-of-memory variables you have, grandma! */
         /* need this before calling reserve_initrd */
         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
                 max_low_pfn = e820_end_of_low_ram_pfn();
         else
                 max_low_pfn = max_pfn;
 
         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 #endif
 
 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
         setup_bios_corruption_check();
 #endif
 
         /* max_pfn_mapped is updated here */
         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
         max_pfn_mapped = max_low_pfn_mapped;
 
 #ifdef CONFIG_X86_64
         if (max_pfn > max_low_pfn) {
                 max_pfn_mapped = init_memory_mapping(1UL<<32,
                                                      max_pfn<<PAGE_SHIFT);
                 /* can we preseve max_low_pfn ?*/
                 max_low_pfn = max_pfn;
         }
 #endif
 
         /*
          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
          */
 
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
         if (init_ohci1394_dma_early)
                 init_ohci1394_dma_on_all_controllers();
 #endif
 
         reserve_initrd();
 
 #ifdef CONFIG_X86_64
         vsmp_init();
 #endif
 
         io_delay_init();
 
        /*
         * Parse the ACPI tables for possible boot-time SMP configuration.
         */
        acpi_boot_table_init();

        early_acpi_boot_init();

#ifdef CONFIG_ACPI_NUMA
        /*
         * Parse SRAT to discover nodes.
         */
        acpi_numa_init();
#endif

        initmem_init(0, max_pfn);

#ifdef CONFIG_ACPI_SLEEP
        /*
         * Reserve low memory region for sleep support.
         */
        acpi_reserve_bootmem();
#endif
#ifdef CONFIG_X86_FIND_SMP_CONFIG
        /*
         * Find and reserve possible boot-time SMP configuration:
         */
        find_smp_config();
#endif
        reserve_crashkernel();

#ifdef CONFIG_X86_64
        /*
         * dma32_reserve_bootmem() allocates bootmem which may conflict
         * with the crashkernel command line, so do that after
         * reserve_crashkernel()
         */
        dma32_reserve_bootmem();
#endif

        reserve_ibft_region();

#ifdef CONFIG_KVM_CLOCK
        kvmclock_init();
#endif

        paravirt_pagetable_setup_start(swapper_pg_dir);
        paging_init();
        paravirt_pagetable_setup_done(swapper_pg_dir);
        paravirt_post_allocator_init();

#ifdef CONFIG_X86_64
        map_vsyscall();
#endif

#ifdef CONFIG_X86_GENERICARCH
        generic_apic_probe();
#endif

        early_quirks();

        /*
         * Read APIC and some other early information from ACPI tables.
         */
        acpi_boot_init();

#if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
        /*
         * get boot-time SMP configuration:
         */
        if (smp_found_config)
                get_smp_config();
#endif

        prefill_possible_map();

#ifdef CONFIG_X86_64
        init_cpu_to_node();
#endif

        init_apic_mappings();
        ioapic_init_mappings();

        /* need to wait for io_apic is mapped */
        nr_irqs = probe_nr_irqs();

        kvm_guest_init();

        e820_reserve_resources();
        e820_mark_nosave_regions(max_low_pfn);

#ifdef CONFIG_X86_32
        request_resource(&iomem_resource, &video_ram_resource);
#endif
        reserve_standard_io_resources();

        e820_setup_gap();

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
        if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
                conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
        conswitchp = &dummy_con;
#endif
#endif
}