2 * sleep.c - x86-specific ACPI sleep support.
4 * Copyright (C) 2001-2003 Patrick Mochel
5 * Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
8 #include <linux/acpi.h>
9 #include <linux/bootmem.h>
13 /* address in low memory of the wakeup routine. */
14 unsigned long acpi_wakeup_address = 0;
15 unsigned long acpi_video_flags;
16 extern char wakeup_start, wakeup_end;
18 extern void zap_low_mappings(void);
20 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
22 static void init_low_mapping(pgd_t *pgd, int pgd_limit)
26 while ((pgd_ofs < pgd_limit) && (pgd_ofs + USER_PTRS_PER_PGD < PTRS_PER_PGD)) {
27 set_pgd(pgd, *(pgd+USER_PTRS_PER_PGD));
33 * acpi_save_state_mem - save kernel state
35 * Create an identity mapped page table and copy the wakeup routine to
38 int acpi_save_state_mem (void)
40 if (!acpi_wakeup_address)
42 init_low_mapping(swapper_pg_dir, USER_PTRS_PER_PGD);
43 memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end - &wakeup_start);
44 acpi_copy_wakeup_routine(acpi_wakeup_address);
50 * acpi_save_state_disk - save kernel state to disk
53 int acpi_save_state_disk (void)
61 void acpi_restore_state_mem (void)
67 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
69 * We allocate a page from the first 1MB of memory for the wakeup
70 * routine for when we come back from a sleep state. The
71 * runtime allocator allows specification of <16MB pages, but not
74 void __init acpi_reserve_bootmem(void)
76 if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) {
77 printk(KERN_ERR "ACPI: Wakeup code way too big, S3 disabled.\n");
81 printk(KERN_ERR "ACPI: S3 and PAE do not like each other for now, S3 disabled.\n");
84 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
85 if (!acpi_wakeup_address)
86 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
89 static int __init acpi_sleep_setup(char *str)
91 while ((str != NULL) && (*str != '\0')) {
92 if (strncmp(str, "s3_bios", 7) == 0)
94 if (strncmp(str, "s3_mode", 7) == 0)
95 acpi_video_flags |= 2;
96 str = strchr(str, ',');
98 str += strspn(str, ", \t");
104 __setup("acpi_sleep=", acpi_sleep_setup);