arch/x86/kernel/acpi/sleep.c

   1 /*
   2  * sleep.c - x86-specific ACPI sleep support.
   3  *
   4  *  Copyright (C) 2001-2003 Patrick Mochel
   5  *  Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/bootmem.h>
  10 #include <linux/dmi.h>
  11 #include <linux/cpumask.h>
  12
  13 #include "realmode/wakeup.h"
  14 #include "sleep.h"
  15
  16 unsigned long acpi_wakeup_address;
  17 unsigned long acpi_realmode_flags;
  18
  19 /* address in low memory of the wakeup routine. */
  20 static unsigned long acpi_realmode;
  21
  22 #ifdef CONFIG_64BIT
  23 static char temp_stack[10240];
  24 #endif
  25
  26 /* XXX: this macro should move to asm-x86/segment.h and be shared with the
  27    boot code... */
  28 #define GDT_ENTRY(flags, base, limit)           \
  29         (((u64)(base & 0xff000000) << 32) |     \
  30          ((u64)flags << 40) |                   \
  31          ((u64)(limit & 0x00ff0000) << 32) |    \
  32          ((u64)(base & 0x00ffffff) << 16) |     \
  33          ((u64)(limit & 0x0000ffff)))
  34
  35 /**
  36  * acpi_save_state_mem - save kernel state
  37  *
  38  * Create an identity mapped page table and copy the wakeup routine to
  39  * low memory.
  40  *
  41  * Note that this is too late to change acpi_wakeup_address.
  42  */
  43 int acpi_save_state_mem(void)
  44 {
  45         struct wakeup_header *header;
  46
  47         if (!acpi_realmode) {
  48                 printk(KERN_ERR "Could not allocate memory during boot, "
  49                        "S3 disabled\n");
  50                 return -ENOMEM;
  51         }
  52         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
  53
  54         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
  55         if (header->signature != 0x51ee1111) {
  56                 printk(KERN_ERR "wakeup header does not match\n");
  57                 return -EINVAL;
  58         }
  59
  60         header->video_mode = saved_video_mode;
  61
  62         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  63
  64         /*
  65          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  66          * that is, with limits set to 4 GB.  At least the Lenovo
  67          * Thinkpad X61 is known to need this for the video BIOS
  68          * initialization quirk to work; this is likely to also
  69          * be the case for other laptops or integrated video devices.
  70          */
  71
  72         /* GDT[0]: GDT self-pointer */
  73         header->wakeup_gdt[0] =
  74                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  75                 ((u64)(acpi_wakeup_address +
  76                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
  77                                 << 16);
  78         /* GDT[1]: big real mode-like code segment */
  79         header->wakeup_gdt[1] =
  80                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  81         /* GDT[2]: big real mode-like data segment */
  82         header->wakeup_gdt[2] =
  83                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  84
  85 #ifndef CONFIG_64BIT
  86         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  87
  88         header->pmode_efer_low = nx_enabled;
  89         if (header->pmode_efer_low & 1) {
  90                 /* This is strange, why not save efer, always? */
  91                 rdmsr(MSR_EFER, header->pmode_efer_low,
  92                         header->pmode_efer_high);
  93         }
  94 #endif /* !CONFIG_64BIT */
  95
  96         header->pmode_cr0 = read_cr0();
  97         header->pmode_cr4 = read_cr4();
  98         header->realmode_flags = acpi_realmode_flags;
  99         header->real_magic = 0x12345678;
 100
 101 #ifndef CONFIG_64BIT
 102         header->pmode_entry = (u32)&wakeup_pmode_return;
 103         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
 104         saved_magic = 0x12345678;
 105 #else /* CONFIG_64BIT */
 106         header->trampoline_segment = setup_trampoline() >> 4;
 107 #ifdef CONFIG_SMP
 108         stack_start.sp = temp_stack + 4096;
 109 #endif
 110         initial_code = (unsigned long)wakeup_long64;
 111         saved_magic = 0x123456789abcdef0;
 112 #endif /* CONFIG_64BIT */
 113
 114         return 0;
 115 }
 116
 117 /*
 118  * acpi_restore_state - undo effects of acpi_save_state_mem
 119  */
 120 void acpi_restore_state_mem(void)
 121 {
 122 }
 123
 124
 125 /**
 126  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
 127  *
 128  * We allocate a page from the first 1MB of memory for the wakeup
 129  * routine for when we come back from a sleep state. The
 130  * runtime allocator allows specification of <16MB pages, but not
 131  * <1MB pages.
 132  */
 133 void __init acpi_reserve_bootmem(void)
 134 {
 135         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 136                 printk(KERN_ERR
 137                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 138                 return;
 139         }
 140
 141         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
 142
 143         if (!acpi_realmode) {
 144                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 145                 return;
 146         }
 147
 148         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
 149 }
 150
 151
 152 static int __init acpi_sleep_setup(char *str)
 153 {
 154         while ((str != NULL) && (*str != '\0')) {
 155                 if (strncmp(str, "s3_bios", 7) == 0)
 156                         acpi_realmode_flags |= 1;
 157                 if (strncmp(str, "s3_mode", 7) == 0)
 158                         acpi_realmode_flags |= 2;
 159                 if (strncmp(str, "s3_beep", 7) == 0)
 160                         acpi_realmode_flags |= 4;
 161                 str = strchr(str, ',');
 162                 if (str != NULL)
 163                         str += strspn(str, ", \t");
 164         }
 165         return 1;
 166 }
 167
 168 __setup("acpi_sleep=", acpi_sleep_setup);