Pull bugzilla-7907 into release branch
[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 <linux/cpumask.h>
12
13 #include <asm/smp.h>
14
15 /* address in low memory of the wakeup routine. */
16 unsigned long acpi_wakeup_address = 0;
17 unsigned long acpi_video_flags;
18 extern char wakeup_start, wakeup_end;
19
20 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
21
22 /**
23  * acpi_save_state_mem - save kernel state
24  *
25  * Create an identity mapped page table and copy the wakeup routine to
26  * low memory.
27  */
28 int acpi_save_state_mem(void)
29 {
30         if (!acpi_wakeup_address)
31                 return 1;
32         memcpy((void *)acpi_wakeup_address, &wakeup_start,
33                &wakeup_end - &wakeup_start);
34         acpi_copy_wakeup_routine(acpi_wakeup_address);
35
36         return 0;
37 }
38
39 /*
40  * acpi_restore_state - undo effects of acpi_save_state_mem
41  */
42 void acpi_restore_state_mem(void)
43 {
44 }
45
46 /**
47  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
48  *
49  * We allocate a page from the first 1MB of memory for the wakeup
50  * routine for when we come back from a sleep state. The
51  * runtime allocator allows specification of <16MB pages, but not
52  * <1MB pages.
53  */
54 void __init acpi_reserve_bootmem(void)
55 {
56         if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) {
57                 printk(KERN_ERR
58                        "ACPI: Wakeup code way too big, S3 disabled.\n");
59                 return;
60         }
61
62         acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
63         if (!acpi_wakeup_address)
64                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
65 }
66
67 static int __init acpi_sleep_setup(char *str)
68 {
69         while ((str != NULL) && (*str != '\0')) {
70                 if (strncmp(str, "s3_bios", 7) == 0)
71                         acpi_video_flags = 1;
72                 if (strncmp(str, "s3_mode", 7) == 0)
73                         acpi_video_flags |= 2;
74                 str = strchr(str, ',');
75                 if (str != NULL)
76                         str += strspn(str, ", \t");
77         }
78         return 1;
79 }
80
81 __setup("acpi_sleep=", acpi_sleep_setup);
82
83 static __init int reset_videomode_after_s3(struct dmi_system_id *d)
84 {
85         acpi_video_flags |= 2;
86         return 0;
87 }
88
89 static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
90         {                       /* Reset video mode after returning from ACPI S3 sleep */
91          .callback = reset_videomode_after_s3,
92          .ident = "Toshiba Satellite 4030cdt",
93          .matches = {
94                      DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
95                      },
96          },
97         {}
98 };
99
100 static int __init acpisleep_dmi_init(void)
101 {
102         dmi_check_system(acpisleep_dmi_table);
103         return 0;
104 }
105
106 core_initcall(acpisleep_dmi_init);