sleep.c

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/*
 * sleep.c - x86-specific ACPI sleep support.
 *
 *  Copyright (C) 2001-2003 Patrick Mochel
 *  Copyright (C) 2001-2003 Pavel Machek <[email protected]>
 */

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <asm/segment.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/realmode.h>

#include "../../realmode/rm/wakeup.h"
#include "sleep.h"

unsigned long acpi_realmode_flags;

#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
static char temp_stack[4096];
#endif

int acpi_suspend_lowlevel(void)
{
    struct wakeup_header *header =
        (struct wakeup_header *) __va(real_mode_header->wakeup_header);

    if (header->signature != WAKEUP_HEADER_SIGNATURE) {
        printk(KERN_ERR "wakeup header does not match\n");
        return -EINVAL;
    }

    header->video_mode = saved_video_mode;

    header->pmode_behavior = 0;

#ifndef CONFIG_64BIT
    store_gdt((struct desc_ptr *)&header->pmode_gdt);

    if (!rdmsr_safe(MSR_EFER,
            &header->pmode_efer_low,
            &header->pmode_efer_high))
        header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
#endif /* !CONFIG_64BIT */

    header->pmode_cr0 = read_cr0();
    if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
        header->pmode_cr4 = read_cr4();
        header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
    }
    if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
            &header->pmode_misc_en_low,
            &header->pmode_misc_en_high))
        header->pmode_behavior |=
            (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
    header->realmode_flags = acpi_realmode_flags;
    header->real_magic = 0x12345678;

#ifndef CONFIG_64BIT
    header->pmode_entry = (u32)&wakeup_pmode_return;
    header->pmode_cr3 = (u32)__pa(&initial_page_table);
    saved_magic = 0x12345678;
#else /* CONFIG_64BIT */
#ifdef CONFIG_SMP
    stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
    early_gdt_descr.address =
            (unsigned long)get_cpu_gdt_table(smp_processor_id());
    initial_gs = per_cpu_offset(smp_processor_id());
#endif
    initial_code = (unsigned long)wakeup_long64;
       saved_magic = 0x123456789abcdef0L;
#endif /* CONFIG_64BIT */

    do_suspend_lowlevel();
    return 0;
}

static int __init acpi_sleep_setup(char *str)
{
    while ((str != NULL) && (*str != '\0')) {
        if (strncmp(str, "s3_bios", 7) == 0)
            acpi_realmode_flags |= 1;
        if (strncmp(str, "s3_mode", 7) == 0)
            acpi_realmode_flags |= 2;
        if (strncmp(str, "s3_beep", 7) == 0)
            acpi_realmode_flags |= 4;
#ifdef CONFIG_HIBERNATION
        if (strncmp(str, "s4_nohwsig", 10) == 0)
            acpi_no_s4_hw_signature();
#endif
        if (strncmp(str, "nonvs", 5) == 0)
            acpi_nvs_nosave();
        if (strncmp(str, "old_ordering", 12) == 0)
            acpi_old_suspend_ordering();
        str = strchr(str, ',');
        if (str != NULL)
            str += strspn(str, ", \t");
    }
    return 1;
}

__setup("acpi_sleep=", acpi_sleep_setup);