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
  18 #include "realmode/wakeup.h"
  19 #include "sleep.h"
  20
  21 unsigned long acpi_realmode_flags;
  22
  23 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  24 static char temp_stack[4096];
  25 #endif
  26
  27 asmlinkage void acpi_enter_s3(void)
  28 {
  29         acpi_enter_sleep_state(3, wake_sleep_flags);
  30 }
  31 /**
  32  * acpi_suspend_lowlevel - save kernel state
  33  *
  34  * Create an identity mapped page table and copy the wakeup routine to
  35  * low memory.
  36  */
  37 int acpi_suspend_lowlevel(void)
  38 {
  39         struct wakeup_header *header;
  40         /* address in low memory of the wakeup routine. */
  41         char *acpi_realmode;
  42
  43         acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);
  44
  45         header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
  46         if (header->signature != WAKEUP_HEADER_SIGNATURE) {
  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
  55         /*
  56          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  57          * that is, with limits set to 4 GB.  At least the Lenovo
  58          * Thinkpad X61 is known to need this for the video BIOS
  59          * initialization quirk to work; this is likely to also
  60          * be the case for other laptops or integrated video devices.
  61          */
  62
  63         /* GDT[0]: GDT self-pointer */
  64         header->wakeup_gdt[0] =
  65                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  66                 ((u64)__pa(&header->wakeup_gdt) << 16);
  67         /* GDT[1]: big real mode-like code segment */
  68         header->wakeup_gdt[1] =
  69                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  70         /* GDT[2]: big real mode-like data segment */
  71         header->wakeup_gdt[2] =
  72                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  73
  74 #ifndef CONFIG_64BIT
  75         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  76
  77         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  78                        &header->pmode_efer_high))
  79                 header->pmode_efer_low = header->pmode_efer_high = 0;
  80 #endif /* !CONFIG_64BIT */
  81
  82         header->pmode_cr0 = read_cr0();
  83         header->pmode_cr4 = read_cr4_safe();
  84         header->pmode_behavior = 0;
  85         if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
  86                         &header->pmode_misc_en_low,
  87                         &header->pmode_misc_en_high))
  88                 header->pmode_behavior |=
  89                         (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
  90         header->realmode_flags = acpi_realmode_flags;
  91         header->real_magic = 0x12345678;
  92
  93 #ifndef CONFIG_64BIT
  94         header->pmode_entry = (u32)&wakeup_pmode_return;
  95         header->pmode_cr3 = (u32)__pa(&initial_page_table);
  96         saved_magic = 0x12345678;
  97 #else /* CONFIG_64BIT */
  98         header->trampoline_segment = trampoline_address() >> 4;
  99 #ifdef CONFIG_SMP
 100         stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
 101         early_gdt_descr.address =
 102                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
 103         initial_gs = per_cpu_offset(smp_processor_id());
 104 #endif
 105         initial_code = (unsigned long)wakeup_long64;
 106        saved_magic = 0x123456789abcdef0L;
 107 #endif /* CONFIG_64BIT */
 108
 109         do_suspend_lowlevel();
 110         return 0;
 111 }
 112
 113 static int __init acpi_sleep_setup(char *str)
 114 {
 115         while ((str != NULL) && (*str != '\0')) {
 116                 if (strncmp(str, "s3_bios", 7) == 0)
 117                         acpi_realmode_flags |= 1;
 118                 if (strncmp(str, "s3_mode", 7) == 0)
 119                         acpi_realmode_flags |= 2;
 120                 if (strncmp(str, "s3_beep", 7) == 0)
 121                         acpi_realmode_flags |= 4;
 122 #ifdef CONFIG_HIBERNATION
 123                 if (strncmp(str, "s4_nohwsig", 10) == 0)
 124                         acpi_no_s4_hw_signature();
 125 #endif
 126                 if (strncmp(str, "nonvs", 5) == 0)
 127                         acpi_nvs_nosave();
 128                 if (strncmp(str, "old_ordering", 12) == 0)
 129                         acpi_old_suspend_ordering();
 130                 str = strchr(str, ',');
 131                 if (str != NULL)
 132                         str += strspn(str, ", \t");
 133         }
 134         return 1;
 135 }
 136
 137 __setup("acpi_sleep=", acpi_sleep_setup);