LXR linux/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
  21unsigned long acpi_realmode_flags;
  22
  23#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  24static char temp_stack[4096];
  25#endif
  26
  27/**
  28 * acpi_suspend_lowlevel - save kernel state
  29 *
  30 * Create an identity mapped page table and copy the wakeup routine to
  31 * low memory.
  32 */
  33int acpi_suspend_lowlevel(void)
  34{
  35        struct wakeup_header *header;
  36        /* address in low memory of the wakeup routine. */
  37        char *acpi_realmode;
  38
  39        acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);
  40
  41        header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
  42        if (header->signature != WAKEUP_HEADER_SIGNATURE) {
  43                printk(KERN_ERR "wakeup header does not match\n");
  44                return -EINVAL;
  45        }
  46
  47        header->video_mode = saved_video_mode;
  48
  49        header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  50
  51        /*
  52         * Set up the wakeup GDT.  We set these up as Big Real Mode,
  53         * that is, with limits set to 4 GB.  At least the Lenovo
  54         * Thinkpad X61 is known to need this for the video BIOS
  55         * initialization quirk to work; this is likely to also
  56         * be the case for other laptops or integrated video devices.
  57         */
  58
  59        /* GDT[0]: GDT self-pointer */
  60        header->wakeup_gdt[0] =
  61                (u64)(sizeof(header->wakeup_gdt) - 1) +
  62                ((u64)__pa(&header->wakeup_gdt) << 16);
  63        /* GDT[1]: big real mode-like code segment */
  64        header->wakeup_gdt[1] =
  65                GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  66        /* GDT[2]: big real mode-like data segment */
  67        header->wakeup_gdt[2] =
  68                GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  69
  70#ifndef CONFIG_64BIT
  71        store_gdt((struct desc_ptr *)&header->pmode_gdt);
  72
  73        if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  74                       &header->pmode_efer_high))
  75                header->pmode_efer_low = header->pmode_efer_high = 0;
  76#endif /* !CONFIG_64BIT */
  77
  78        header->pmode_cr0 = read_cr0();
  79        header->pmode_cr4 = read_cr4_safe();
  80        header->pmode_behavior = 0;
  81        if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
  82                        &header->pmode_misc_en_low,
  83                        &header->pmode_misc_en_high))
  84                header->pmode_behavior |=
  85                        (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
  86        header->realmode_flags = acpi_realmode_flags;
  87        header->real_magic = 0x12345678;
  88
  89#ifndef CONFIG_64BIT
  90        header->pmode_entry = (u32)&wakeup_pmode_return;
  91        header->pmode_cr3 = (u32)__pa(&initial_page_table);
  92        saved_magic = 0x12345678;
  93#else /* CONFIG_64BIT */
  94        header->trampoline_segment = trampoline_address() >> 4;
  95#ifdef CONFIG_SMP
  96        stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
  97        early_gdt_descr.address =
  98                        (unsigned long)get_cpu_gdt_table(smp_processor_id());
  99        initial_gs = per_cpu_offset(smp_processor_id());
 100#endif
 101        initial_code = (unsigned long)wakeup_long64;
 102       saved_magic = 0x123456789abcdef0L;
 103#endif /* CONFIG_64BIT */
 104
 105        do_suspend_lowlevel();
 106        return 0;
 107}
 108
 109static int __init acpi_sleep_setup(char *str)
 110{
 111        while ((str != NULL) && (*str != '\0')) {
 112                if (strncmp(str, "s3_bios", 7) == 0)
 113                        acpi_realmode_flags |= 1;
 114                if (strncmp(str, "s3_mode", 7) == 0)
 115                        acpi_realmode_flags |= 2;
 116                if (strncmp(str, "s3_beep", 7) == 0)
 117                        acpi_realmode_flags |= 4;
 118#ifdef CONFIG_HIBERNATION
 119                if (strncmp(str, "s4_nohwsig", 10) == 0)
 120                        acpi_no_s4_hw_signature();
 121#endif
 122                if (strncmp(str, "nonvs", 5) == 0)
 123                        acpi_nvs_nosave();
 124                if (strncmp(str, "old_ordering", 12) == 0)
 125                        acpi_old_suspend_ordering();
 126                str = strchr(str, ',');
 127                if (str != NULL)
 128                        str += strspn(str, ", \t");
 129        }
 130        return 1;
 131}
 132
 133__setup("acpi_sleep=", acpi_sleep_setup);
 134