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 #include <asm/segment.h>
  13
  14 #include "realmode/wakeup.h"
  15 #include "sleep.h"
  16
  17 unsigned long acpi_wakeup_address;
  18 unsigned long acpi_realmode_flags;
  19
  20 /* address in low memory of the wakeup routine. */
  21 static unsigned long acpi_realmode;
  22
  23 #ifdef CONFIG_64BIT
  24 static char temp_stack[10240];
  25 #endif
  26
  27 /**
  28  * acpi_save_state_mem - save kernel state
  29  *
  30  * Create an identity mapped page table and copy the wakeup routine to
  31  * low memory.
  32  *
  33  * Note that this is too late to change acpi_wakeup_address.
  34  */
  35 int acpi_save_state_mem(void)
  36 {
  37         struct wakeup_header *header;
  38
  39         if (!acpi_realmode) {
  40                 printk(KERN_ERR "Could not allocate memory during boot, "
  41                        "S3 disabled\n");
  42                 return -ENOMEM;
  43         }
  44         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
  45
  46         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
  47         if (header->signature != 0x51ee1111) {
  48                 printk(KERN_ERR "wakeup header does not match\n");
  49                 return -EINVAL;
  50         }
  51
  52         header->video_mode = saved_video_mode;
  53
  54         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  55
  56         /*
  57          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  58          * that is, with limits set to 4 GB.  At least the Lenovo
  59          * Thinkpad X61 is known to need this for the video BIOS
  60          * initialization quirk to work; this is likely to also
  61          * be the case for other laptops or integrated video devices.
  62          */
  63
  64         /* GDT[0]: GDT self-pointer */
  65         header->wakeup_gdt[0] =
  66                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  67                 ((u64)(acpi_wakeup_address +
  68                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
  69                                 << 16);
  70         /* GDT[1]: big real mode-like code segment */
  71         header->wakeup_gdt[1] =
  72                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  73         /* GDT[2]: big real mode-like data segment */
  74         header->wakeup_gdt[2] =
  75                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  76
  77 #ifndef CONFIG_64BIT
  78         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  79
  80         header->pmode_efer_low = nx_enabled;
  81         if (header->pmode_efer_low & 1) {
  82                 /* This is strange, why not save efer, always? */
  83                 rdmsr(MSR_EFER, header->pmode_efer_low,
  84                         header->pmode_efer_high);
  85         }
  86 #endif /* !CONFIG_64BIT */
  87
  88         header->pmode_cr0 = read_cr0();
  89         header->pmode_cr4 = read_cr4();
  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)(swsusp_pg_dir - __PAGE_OFFSET);
  96         saved_magic = 0x12345678;
  97 #else /* CONFIG_64BIT */
  98         header->trampoline_segment = setup_trampoline() >> 4;
  99 #ifdef CONFIG_SMP
 100         stack_start.sp = temp_stack + 4096;
 101 #endif
 102         initial_code = (unsigned long)wakeup_long64;
 103         saved_magic = 0x123456789abcdef0;
 104 #endif /* CONFIG_64BIT */
 105
 106         return 0;
 107 }
 108
 109 /*
 110  * acpi_restore_state - undo effects of acpi_save_state_mem
 111  */
 112 void acpi_restore_state_mem(void)
 113 {
 114 }
 115
 116
 117 /**
 118  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
 119  *
 120  * We allocate a page from the first 1MB of memory for the wakeup
 121  * routine for when we come back from a sleep state. The
 122  * runtime allocator allows specification of <16MB pages, but not
 123  * <1MB pages.
 124  */
 125 void __init acpi_reserve_bootmem(void)
 126 {
 127         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 128                 printk(KERN_ERR
 129                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 130                 return;
 131         }
 132
 133         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
 134
 135         if (!acpi_realmode) {
 136                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 137                 return;
 138         }
 139
 140         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
 141 }
 142
 143
 144 static int __init acpi_sleep_setup(char *str)
 145 {
 146         while ((str != NULL) && (*str != '\0')) {
 147                 if (strncmp(str, "s3_bios", 7) == 0)
 148                         acpi_realmode_flags |= 1;
 149                 if (strncmp(str, "s3_mode", 7) == 0)
 150                         acpi_realmode_flags |= 2;
 151                 if (strncmp(str, "s3_beep", 7) == 0)
 152                         acpi_realmode_flags |= 4;
 153 #ifdef CONFIG_HIBERNATION
 154                 if (strncmp(str, "s4_nohwsig", 10) == 0)
 155                         acpi_no_s4_hw_signature();
 156 #endif
 157                 if (strncmp(str, "old_ordering", 12) == 0)
 158                         acpi_old_suspend_ordering();
 159                 str = strchr(str, ',');
 160                 if (str != NULL)
 161                         str += strspn(str, ", \t");
 162         }
 163         return 1;
 164 }
 165
 166 __setup("acpi_sleep=", acpi_sleep_setup);