Merge branch 'nfs-server-stable' of git://linux-nfs.org/~bfields/linux
[linux-2.6] / arch / x86 / kernel / acpi / sleep_32.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_realmode_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_realmode_flags |= 1;
72                 if (strncmp(str, "s3_mode", 7) == 0)
73                         acpi_realmode_flags |= 2;
74                 if (strncmp(str, "s3_beep", 7) == 0)
75                         acpi_realmode_flags |= 4;
76                 str = strchr(str, ',');
77                 if (str != NULL)
78                         str += strspn(str, ", \t");
79         }
80         return 1;
81 }
82
83 __setup("acpi_sleep=", acpi_sleep_setup);
84
85 /* Ouch, we want to delete this. We already have better version in userspace, in
86    s2ram from suspend.sf.net project */
87 static __init int reset_videomode_after_s3(const struct dmi_system_id *d)
88 {
89         acpi_realmode_flags |= 2;
90         return 0;
91 }
92
93 static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
94         {                       /* Reset video mode after returning from ACPI S3 sleep */
95          .callback = reset_videomode_after_s3,
96          .ident = "Toshiba Satellite 4030cdt",
97          .matches = {
98                      DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
99                      },
100          },
101         {}
102 };
103
104 static int __init acpisleep_dmi_init(void)
105 {
106         dmi_check_system(acpisleep_dmi_table);
107         return 0;
108 }
109
110 core_initcall(acpisleep_dmi_init);