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sleep_32.c

/*
 * sleep.c - x86-specific ACPI sleep support.
 *
 *  Copyright (C) 2001-2003 Patrick Mochel
 *  Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
 */

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>

#include <asm/smp.h>

/* address in low memory of the wakeup routine. */
unsigned long acpi_wakeup_address = 0;
unsigned long acpi_realmode_flags;
extern char wakeup_start, wakeup_end;

extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));

/**
 * acpi_save_state_mem - save kernel state
 *
 * Create an identity mapped page table and copy the wakeup routine to
 * low memory.
 */
int acpi_save_state_mem(void)
{
      if (!acpi_wakeup_address)
            return 1;
      memcpy((void *)acpi_wakeup_address, &wakeup_start,
             &wakeup_end - &wakeup_start);
      acpi_copy_wakeup_routine(acpi_wakeup_address);

      return 0;
}

/*
 * acpi_restore_state - undo effects of acpi_save_state_mem
 */
void acpi_restore_state_mem(void)
{
}

/**
 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
 *
 * We allocate a page from the first 1MB of memory for the wakeup
 * routine for when we come back from a sleep state. The
 * runtime allocator allows specification of <16MB pages, but not
 * <1MB pages.
 */
void __init acpi_reserve_bootmem(void)
{
      if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) {
            printk(KERN_ERR
                   "ACPI: Wakeup code way too big, S3 disabled.\n");
            return;
      }

      acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
      if (!acpi_wakeup_address)
            printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
}

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;
            str = strchr(str, ',');
            if (str != NULL)
                  str += strspn(str, ", \t");
      }
      return 1;
}

__setup("acpi_sleep=", acpi_sleep_setup);

/* Ouch, we want to delete this. We already have better version in userspace, in
   s2ram from suspend.sf.net project */
static __init int reset_videomode_after_s3(const struct dmi_system_id *d)
{
      acpi_realmode_flags |= 2;
      return 0;
}

static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
      {                 /* Reset video mode after returning from ACPI S3 sleep */
       .callback = reset_videomode_after_s3,
       .ident = "Toshiba Satellite 4030cdt",
       .matches = {
                 DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
                 },
       },
      {}
};

static int __init acpisleep_dmi_init(void)
{
      dmi_check_system(acpisleep_dmi_table);
      return 0;
}

core_initcall(acpisleep_dmi_init);

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