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 /**
  27  * acpi_save_state_mem - save kernel state
  28  *
  29  * Create an identity mapped page table and copy the wakeup routine to
  30  * low memory.
  31  *
  32  * Note that this is too late to change acpi_wakeup_address.
  33  */
  34 int acpi_save_state_mem(void)
  35 {
  36         struct wakeup_header *header;
  37
  38         if (!acpi_realmode) {
  39                 printk(KERN_ERR "Could not allocate memory during boot, "
  40                        "S3 disabled\n");
  41                 return -ENOMEM;
  42         }
  43         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
  44
  45         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
  46         if (header->signature != 0x51ee1111) {
  47                 printk(KERN_ERR "wakeup header does not match\n");
  48                 return -EINVAL;
  49         }
  50
  51         header->video_mode = saved_video_mode;
  52
  53         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  54         /* GDT[0]: GDT self-pointer */
  55         header->wakeup_gdt[0] =
  56                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  57                 ((u64)(acpi_wakeup_address +
  58                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
  59                                 << 16);
  60         /* GDT[1]: real-mode-like code segment */
  61         header->wakeup_gdt[1] = (0x009bULL << 40) +
  62                 ((u64)acpi_wakeup_address << 16) + 0xffff;
  63         /* GDT[2]: real-mode-like data segment */
  64         header->wakeup_gdt[2] = (0x0093ULL << 40) +
  65                 ((u64)acpi_wakeup_address << 16) + 0xffff;
  66
  67 #ifndef CONFIG_64BIT
  68         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  69
  70         header->pmode_efer_low = nx_enabled;
  71         if (header->pmode_efer_low & 1) {
  72                 /* This is strange, why not save efer, always? */
  73                 rdmsr(MSR_EFER, header->pmode_efer_low,
  74                         header->pmode_efer_high);
  75         }
  76 #endif /* !CONFIG_64BIT */
  77
  78         header->pmode_cr0 = read_cr0();
  79         header->pmode_cr4 = read_cr4();
  80         header->realmode_flags = acpi_realmode_flags;
  81         header->real_magic = 0x12345678;
  82
  83 #ifndef CONFIG_64BIT
  84         header->pmode_entry = (u32)&wakeup_pmode_return;
  85         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
  86         saved_magic = 0x12345678;
  87 #else /* CONFIG_64BIT */
  88         header->trampoline_segment = setup_trampoline() >> 4;
  89         init_rsp = (unsigned long)temp_stack + 4096;
  90         initial_code = (unsigned long)wakeup_long64;
  91         saved_magic = 0x123456789abcdef0;
  92 #endif /* CONFIG_64BIT */
  93
  94         return 0;
  95 }
  96
  97 /*
  98  * acpi_restore_state - undo effects of acpi_save_state_mem
  99  */
 100 void acpi_restore_state_mem(void)
 101 {
 102 }
 103
 104
 105 /**
 106  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
 107  *
 108  * We allocate a page from the first 1MB of memory for the wakeup
 109  * routine for when we come back from a sleep state. The
 110  * runtime allocator allows specification of <16MB pages, but not
 111  * <1MB pages.
 112  */
 113 void __init acpi_reserve_bootmem(void)
 114 {
 115         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 116                 printk(KERN_ERR
 117                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 118                 return;
 119         }
 120
 121         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
 122
 123         if (!acpi_realmode) {
 124                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 125                 return;
 126         }
 127
 128         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
 129 }
 130
 131
 132 static int __init acpi_sleep_setup(char *str)
 133 {
 134         while ((str != NULL) && (*str != '\0')) {
 135                 if (strncmp(str, "s3_bios", 7) == 0)
 136                         acpi_realmode_flags |= 1;
 137                 if (strncmp(str, "s3_mode", 7) == 0)
 138                         acpi_realmode_flags |= 2;
 139                 if (strncmp(str, "s3_beep", 7) == 0)
 140                         acpi_realmode_flags |= 4;
 141                 str = strchr(str, ',');
 142                 if (str != NULL)
 143                         str += strspn(str, ", \t");
 144         }
 145         return 1;
 146 }
 147
 148 __setup("acpi_sleep=", acpi_sleep_setup);