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 #ifndef CONFIG_64BIT
  54         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  55
  56         header->pmode_efer_low = nx_enabled;
  57         if (header->pmode_efer_low & 1) {
  58                 /* This is strange, why not save efer, always? */
  59                 rdmsr(MSR_EFER, header->pmode_efer_low,
  60                         header->pmode_efer_high);
  61         }
  62 #endif /* !CONFIG_64BIT */
  63
  64         header->pmode_cr0 = read_cr0();
  65         header->pmode_cr4 = read_cr4();
  66         header->realmode_flags = acpi_realmode_flags;
  67         header->real_magic = 0x12345678;
  68
  69 #ifndef CONFIG_64BIT
  70         header->pmode_entry = (u32)&wakeup_pmode_return;
  71         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
  72         saved_magic = 0x12345678;
  73 #else /* CONFIG_64BIT */
  74         header->trampoline_segment = setup_trampoline() >> 4;
  75         init_rsp = (unsigned long)temp_stack + 4096;
  76         initial_code = (unsigned long)wakeup_long64;
  77         saved_magic = 0x123456789abcdef0;
  78 #endif /* CONFIG_64BIT */
  79
  80         return 0;
  81 }
  82
  83 /*
  84  * acpi_restore_state - undo effects of acpi_save_state_mem
  85  */
  86 void acpi_restore_state_mem(void)
  87 {
  88 }
  89
  90
  91 /**
  92  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
  93  *
  94  * We allocate a page from the first 1MB of memory for the wakeup
  95  * routine for when we come back from a sleep state. The
  96  * runtime allocator allows specification of <16MB pages, but not
  97  * <1MB pages.
  98  */
  99 void __init acpi_reserve_bootmem(void)
 100 {
 101         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 102                 printk(KERN_ERR
 103                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 104                 return;
 105         }
 106
 107         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
 108
 109         if (!acpi_realmode) {
 110                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 111                 return;
 112         }
 113
 114         acpi_wakeup_address = acpi_realmode;
 115 }
 116
 117
 118 static int __init acpi_sleep_setup(char *str)
 119 {
 120         while ((str != NULL) && (*str != '\0')) {
 121                 if (strncmp(str, "s3_bios", 7) == 0)
 122                         acpi_realmode_flags |= 1;
 123                 if (strncmp(str, "s3_mode", 7) == 0)
 124                         acpi_realmode_flags |= 2;
 125                 if (strncmp(str, "s3_beep", 7) == 0)
 126                         acpi_realmode_flags |= 4;
 127                 str = strchr(str, ',');
 128                 if (str != NULL)
 129                         str += strspn(str, ", \t");
 130         }
 131         return 1;
 132 }
 133
 134 __setup("acpi_sleep=", acpi_sleep_setup);