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@ucw.cz>
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/bootmem.h>
  10 #include <linux/memblock.h>
  11 #include <linux/dmi.h>
  12 #include <linux/cpumask.h>
  13 #include <asm/segment.h>
  14 #include <asm/desc.h>
  15 #include <asm/pgtable.h>
  16 #include <asm/cacheflush.h>
  17 #include <asm/realmode.h>
  18
  19 #include "../../realmode/rm/wakeup.h"
  20 #include "sleep.h"
  21
  22 unsigned long acpi_realmode_flags;
  23
  24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  25 static char temp_stack[4096];
  26 #endif
  27
  28 asmlinkage void acpi_enter_s3(void)
  29 {
  30         acpi_enter_sleep_state(3, wake_sleep_flags);
  31 }
  32 /**
  33  * acpi_suspend_lowlevel - save kernel state
  34  *
  35  * Create an identity mapped page table and copy the wakeup routine to
  36  * low memory.
  37  */
  38 int acpi_suspend_lowlevel(void)
  39 {
  40         struct wakeup_header *header =
  41                 (struct wakeup_header *) __va(real_mode_header->wakeup_header);
  42
  43         if (header->signature != WAKEUP_HEADER_SIGNATURE) {
  44                 printk(KERN_ERR "wakeup header does not match\n");
  45                 return -EINVAL;
  46         }
  47
  48         header->video_mode = saved_video_mode;
  49
  50 #ifndef CONFIG_64BIT
  51         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  52
  53         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  54                        &header->pmode_efer_high))
  55                 header->pmode_efer_low = header->pmode_efer_high = 0;
  56 #endif /* !CONFIG_64BIT */
  57
  58         header->pmode_cr0 = read_cr0();
  59         header->pmode_cr4 = read_cr4_safe();
  60         header->pmode_behavior = 0;
  61         if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
  62                         &header->pmode_misc_en_low,
  63                         &header->pmode_misc_en_high))
  64                 header->pmode_behavior |=
  65                         (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
  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)__pa(&initial_page_table);
  72         saved_magic = 0x12345678;
  73 #else /* CONFIG_64BIT */
  74 #ifdef CONFIG_SMP
  75         stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
  76         early_gdt_descr.address =
  77                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
  78         initial_gs = per_cpu_offset(smp_processor_id());
  79 #endif
  80         initial_code = (unsigned long)wakeup_long64;
  81        saved_magic = 0x123456789abcdef0L;
  82 #endif /* CONFIG_64BIT */
  83
  84         do_suspend_lowlevel();
  85         return 0;
  86 }
  87
  88 static int __init acpi_sleep_setup(char *str)
  89 {
  90         while ((str != NULL) && (*str != '\0')) {
  91                 if (strncmp(str, "s3_bios", 7) == 0)
  92                         acpi_realmode_flags |= 1;
  93                 if (strncmp(str, "s3_mode", 7) == 0)
  94                         acpi_realmode_flags |= 2;
  95                 if (strncmp(str, "s3_beep", 7) == 0)
  96                         acpi_realmode_flags |= 4;
  97 #ifdef CONFIG_HIBERNATION
  98                 if (strncmp(str, "s4_nohwsig", 10) == 0)
  99                         acpi_no_s4_hw_signature();
 100 #endif
 101                 if (strncmp(str, "nonvs", 5) == 0)
 102                         acpi_nvs_nosave();
 103                 if (strncmp(str, "old_ordering", 12) == 0)
 104                         acpi_old_suspend_ordering();
 105                 str = strchr(str, ',');
 106                 if (str != NULL)
 107                         str += strspn(str, ", \t");
 108         }
 109         return 1;
 110 }
 111
 112 __setup("acpi_sleep=", acpi_sleep_setup);