Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[linux-3.10.git] / arch / x86 / 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 "realmode/wakeup.h"
14 #include "sleep.h"
15
16 unsigned long acpi_wakeup_address;
17 unsigned long acpi_realmode_flags;
18
19 /* address in low memory of the wakeup routine. */
20 static unsigned long acpi_realmode;
21
22 #ifdef CONFIG_64BIT
23 static char temp_stack[10240];
24 #endif
25
26 /* XXX: this macro should move to asm-x86/segment.h and be shared with the
27    boot code... */
28 #define GDT_ENTRY(flags, base, limit)           \
29         (((u64)(base & 0xff000000) << 32) |     \
30          ((u64)flags << 40) |                   \
31          ((u64)(limit & 0x00ff0000) << 32) |    \
32          ((u64)(base & 0x00ffffff) << 16) |     \
33          ((u64)(limit & 0x0000ffff)))
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  * Note that this is too late to change acpi_wakeup_address.
42  */
43 int acpi_save_state_mem(void)
44 {
45         struct wakeup_header *header;
46
47         if (!acpi_realmode) {
48                 printk(KERN_ERR "Could not allocate memory during boot, "
49                        "S3 disabled\n");
50                 return -ENOMEM;
51         }
52         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
53
54         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
55         if (header->signature != 0x51ee1111) {
56                 printk(KERN_ERR "wakeup header does not match\n");
57                 return -EINVAL;
58         }
59
60         header->video_mode = saved_video_mode;
61
62         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
63
64         /*
65          * Set up the wakeup GDT.  We set these up as Big Real Mode,
66          * that is, with limits set to 4 GB.  At least the Lenovo
67          * Thinkpad X61 is known to need this for the video BIOS
68          * initialization quirk to work; this is likely to also
69          * be the case for other laptops or integrated video devices.
70          */
71
72         /* GDT[0]: GDT self-pointer */
73         header->wakeup_gdt[0] =
74                 (u64)(sizeof(header->wakeup_gdt) - 1) +
75                 ((u64)(acpi_wakeup_address +
76                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
77                                 << 16);
78         /* GDT[1]: big real mode-like code segment */
79         header->wakeup_gdt[1] =
80                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
81         /* GDT[2]: big real mode-like data segment */
82         header->wakeup_gdt[2] =
83                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
84
85 #ifndef CONFIG_64BIT
86         store_gdt((struct desc_ptr *)&header->pmode_gdt);
87
88         header->pmode_efer_low = nx_enabled;
89         if (header->pmode_efer_low & 1) {
90                 /* This is strange, why not save efer, always? */
91                 rdmsr(MSR_EFER, header->pmode_efer_low,
92                         header->pmode_efer_high);
93         }
94 #endif /* !CONFIG_64BIT */
95
96         header->pmode_cr0 = read_cr0();
97         header->pmode_cr4 = read_cr4();
98         header->realmode_flags = acpi_realmode_flags;
99         header->real_magic = 0x12345678;
100
101 #ifndef CONFIG_64BIT
102         header->pmode_entry = (u32)&wakeup_pmode_return;
103         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
104         saved_magic = 0x12345678;
105 #else /* CONFIG_64BIT */
106         header->trampoline_segment = setup_trampoline() >> 4;
107 #ifdef CONFIG_SMP
108         stack_start.sp = temp_stack + 4096;
109 #endif
110         initial_code = (unsigned long)wakeup_long64;
111         saved_magic = 0x123456789abcdef0;
112 #endif /* CONFIG_64BIT */
113
114         return 0;
115 }
116
117 /*
118  * acpi_restore_state - undo effects of acpi_save_state_mem
119  */
120 void acpi_restore_state_mem(void)
121 {
122 }
123
124
125 /**
126  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
127  *
128  * We allocate a page from the first 1MB of memory for the wakeup
129  * routine for when we come back from a sleep state. The
130  * runtime allocator allows specification of <16MB pages, but not
131  * <1MB pages.
132  */
133 void __init acpi_reserve_bootmem(void)
134 {
135         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
136                 printk(KERN_ERR
137                        "ACPI: Wakeup code way too big, S3 disabled.\n");
138                 return;
139         }
140
141         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
142
143         if (!acpi_realmode) {
144                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
145                 return;
146         }
147
148         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
149 }
150
151
152 static int __init acpi_sleep_setup(char *str)
153 {
154         while ((str != NULL) && (*str != '\0')) {
155                 if (strncmp(str, "s3_bios", 7) == 0)
156                         acpi_realmode_flags |= 1;
157                 if (strncmp(str, "s3_mode", 7) == 0)
158                         acpi_realmode_flags |= 2;
159                 if (strncmp(str, "s3_beep", 7) == 0)
160                         acpi_realmode_flags |= 4;
161                 if (strncmp(str, "old_ordering", 12) == 0)
162                         acpi_old_suspend_ordering();
163                 str = strchr(str, ',');
164                 if (str != NULL)
165                         str += strspn(str, ", \t");
166         }
167         return 1;
168 }
169
170 __setup("acpi_sleep=", acpi_sleep_setup);