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/*
* 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;
unsigned long acpi_realmode_flags;
extern char wakeup_start, wakeup_end;
extern unsigned long 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) {
printk(KERN_ERR "Could not allocate memory during boot, S3 disabled\n");
return -ENOMEM;
}
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*2) {
printk(KERN_ERR
"ACPI: Wakeup code way too big, S3 disabled.\n");
return;
}
acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
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);
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