Merge master.kernel.org:/home/rmk/linux-2.6-mmc
[linux-2.6] / arch / i386 / kernel / acpi / sleep.c
1 /*
2  * sleep.c - x86-specific ACPI sleep support.
3  *
4  *  Copyright (C) 2001-2003 Patrick Mochel
5  *  Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
6  */
7
8 #include <linux/acpi.h>
9 #include <linux/bootmem.h>
10 #include <linux/dmi.h>
11 #include <asm/smp.h>
12 #include <asm/tlbflush.h>
13
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;
18
19 extern void zap_low_mappings(void);
20
21 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
22
23 static void init_low_mapping(pgd_t * pgd, int pgd_limit)
24 {
25         int pgd_ofs = 0;
26
27         while ((pgd_ofs < pgd_limit)
28                && (pgd_ofs + USER_PTRS_PER_PGD < PTRS_PER_PGD)) {
29                 set_pgd(pgd, *(pgd + USER_PTRS_PER_PGD));
30                 pgd_ofs++, pgd++;
31         }
32         flush_tlb_all();
33 }
34
35 /**
36  * acpi_save_state_mem - save kernel state
37  *
38  * Create an identity mapped page table and copy the wakeup routine to
39  * low memory.
40  */
41 int acpi_save_state_mem(void)
42 {
43         if (!acpi_wakeup_address)
44                 return 1;
45         init_low_mapping(swapper_pg_dir, USER_PTRS_PER_PGD);
46         memcpy((void *)acpi_wakeup_address, &wakeup_start,
47                &wakeup_end - &wakeup_start);
48         acpi_copy_wakeup_routine(acpi_wakeup_address);
49
50         return 0;
51 }
52
53 /*
54  * acpi_restore_state - undo effects of acpi_save_state_mem
55  */
56 void acpi_restore_state_mem(void)
57 {
58         zap_low_mappings();
59 }
60
61 /**
62  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
63  *
64  * We allocate a page from the first 1MB of memory for the wakeup
65  * routine for when we come back from a sleep state. The
66  * runtime allocator allows specification of <16MB pages, but not
67  * <1MB pages.
68  */
69 void __init acpi_reserve_bootmem(void)
70 {
71         if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) {
72                 printk(KERN_ERR
73                        "ACPI: Wakeup code way too big, S3 disabled.\n");
74                 return;
75         }
76
77         acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
78         if (!acpi_wakeup_address)
79                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
80 }
81
82 static int __init acpi_sleep_setup(char *str)
83 {
84         while ((str != NULL) && (*str != '\0')) {
85                 if (strncmp(str, "s3_bios", 7) == 0)
86                         acpi_video_flags = 1;
87                 if (strncmp(str, "s3_mode", 7) == 0)
88                         acpi_video_flags |= 2;
89                 str = strchr(str, ',');
90                 if (str != NULL)
91                         str += strspn(str, ", \t");
92         }
93         return 1;
94 }
95
96 __setup("acpi_sleep=", acpi_sleep_setup);
97
98 static __init int reset_videomode_after_s3(struct dmi_system_id *d)
99 {
100         acpi_video_flags |= 2;
101         return 0;
102 }
103
104 static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
105         {                       /* Reset video mode after returning from ACPI S3 sleep */
106          .callback = reset_videomode_after_s3,
107          .ident = "Toshiba Satellite 4030cdt",
108          .matches = {
109                      DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
110                      },
111          },
112         {}
113 };
114
115 static int __init acpisleep_dmi_init(void)
116 {
117         dmi_check_system(acpisleep_dmi_table);
118         return 0;
119 }
120
121 core_initcall(acpisleep_dmi_init);