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>
10 #include <linux/dmi.h>
12 #include <asm/tlbflush.h>
14 /* address in low memory of the wakeup routine. */
15 unsigned long acpi_wakeup_address
= 0;
16 unsigned long acpi_video_flags
;
17 extern char wakeup_start
, wakeup_end
;
19 extern void zap_low_mappings(void);
21 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
23 static void init_low_mapping(pgd_t
*pgd
, int pgd_limit
)
27 while ((pgd_ofs
< pgd_limit
) && (pgd_ofs
+ USER_PTRS_PER_PGD
< PTRS_PER_PGD
)) {
28 set_pgd(pgd
, *(pgd
+USER_PTRS_PER_PGD
));
35 * acpi_save_state_mem - save kernel state
37 * Create an identity mapped page table and copy the wakeup routine to
40 int acpi_save_state_mem (void)
42 if (!acpi_wakeup_address
)
44 init_low_mapping(swapper_pg_dir
, USER_PTRS_PER_PGD
);
45 memcpy((void *) acpi_wakeup_address
, &wakeup_start
, &wakeup_end
- &wakeup_start
);
46 acpi_copy_wakeup_routine(acpi_wakeup_address
);
52 * acpi_restore_state - undo effects of acpi_save_state_mem
54 void acpi_restore_state_mem (void)
60 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
62 * We allocate a page from the first 1MB of memory for the wakeup
63 * routine for when we come back from a sleep state. The
64 * runtime allocator allows specification of <16MB pages, but not
67 void __init
acpi_reserve_bootmem(void)
69 if ((&wakeup_end
- &wakeup_start
) > PAGE_SIZE
) {
70 printk(KERN_ERR
"ACPI: Wakeup code way too big, S3 disabled.\n");
74 acpi_wakeup_address
= (unsigned long)alloc_bootmem_low(PAGE_SIZE
);
75 if (!acpi_wakeup_address
)
76 printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
79 static int __init
acpi_sleep_setup(char *str
)
81 while ((str
!= NULL
) && (*str
!= '\0')) {
82 if (strncmp(str
, "s3_bios", 7) == 0)
84 if (strncmp(str
, "s3_mode", 7) == 0)
85 acpi_video_flags
|= 2;
86 str
= strchr(str
, ',');
88 str
+= strspn(str
, ", \t");
94 __setup("acpi_sleep=", acpi_sleep_setup
);
97 static __init
int reset_videomode_after_s3(struct dmi_system_id
*d
)
99 acpi_video_flags
|= 2;
103 static __initdata
struct dmi_system_id acpisleep_dmi_table
[] = {
104 { /* Reset video mode after returning from ACPI S3 sleep */
105 .callback
= reset_videomode_after_s3
,
106 .ident
= "Toshiba Satellite 4030cdt",
108 DMI_MATCH(DMI_PRODUCT_NAME
, "S4030CDT/4.3"),
114 static int __init
acpisleep_dmi_init(void)
116 dmi_check_system(acpisleep_dmi_table
);
120 core_initcall(acpisleep_dmi_init
);