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4fc2fba8 PM |
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 | ||
e44b7b75 PM |
13 | #include "realmode/wakeup.h" |
14 | #include "sleep.h" | |
4fc2fba8 | 15 | |
f49688d4 | 16 | unsigned long acpi_wakeup_address; |
4fc2fba8 | 17 | unsigned long acpi_realmode_flags; |
4fc2fba8 | 18 | |
e44b7b75 PM |
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 | |
4fc2fba8 PM |
25 | |
26 | /** | |
27 | * acpi_save_state_mem - save kernel state | |
28 | * | |
29 | * Create an identity mapped page table and copy the wakeup routine to | |
30 | * low memory. | |
e44b7b75 PM |
31 | * |
32 | * Note that this is too late to change acpi_wakeup_address. | |
4fc2fba8 PM |
33 | */ |
34 | int acpi_save_state_mem(void) | |
35 | { | |
e44b7b75 PM |
36 | struct wakeup_header *header; |
37 | ||
38 | if (!acpi_realmode) { | |
39 | printk(KERN_ERR "Could not allocate memory during boot, " | |
40 | "S3 disabled\n"); | |
4fc2fba8 PM |
41 | return -ENOMEM; |
42 | } | |
e44b7b75 PM |
43 | memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); |
44 | ||
45 | header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); | |
46 | if (header->signature != 0x51ee1111) { | |
47 | printk(KERN_ERR "wakeup header does not match\n"); | |
48 | return -EINVAL; | |
49 | } | |
50 | ||
51 | header->video_mode = saved_video_mode; | |
52 | ||
4b4f7280 PA |
53 | header->wakeup_jmp_seg = acpi_wakeup_address >> 4; |
54 | /* GDT[0]: GDT self-pointer */ | |
55 | header->wakeup_gdt[0] = | |
56 | (u64)(sizeof(header->wakeup_gdt) - 1) + | |
57 | ((u64)(acpi_wakeup_address + | |
58 | ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) | |
59 | << 16); | |
60 | /* GDT[1]: real-mode-like code segment */ | |
61 | header->wakeup_gdt[1] = (0x009bULL << 40) + | |
62 | ((u64)acpi_wakeup_address << 16) + 0xffff; | |
63 | /* GDT[2]: real-mode-like data segment */ | |
64 | header->wakeup_gdt[2] = (0x0093ULL << 40) + | |
65 | ((u64)acpi_wakeup_address << 16) + 0xffff; | |
66 | ||
e44b7b75 PM |
67 | #ifndef CONFIG_64BIT |
68 | store_gdt((struct desc_ptr *)&header->pmode_gdt); | |
69 | ||
70 | header->pmode_efer_low = nx_enabled; | |
71 | if (header->pmode_efer_low & 1) { | |
72 | /* This is strange, why not save efer, always? */ | |
73 | rdmsr(MSR_EFER, header->pmode_efer_low, | |
74 | header->pmode_efer_high); | |
75 | } | |
76 | #endif /* !CONFIG_64BIT */ | |
77 | ||
78 | header->pmode_cr0 = read_cr0(); | |
79 | header->pmode_cr4 = read_cr4(); | |
80 | header->realmode_flags = acpi_realmode_flags; | |
81 | header->real_magic = 0x12345678; | |
82 | ||
83 | #ifndef CONFIG_64BIT | |
84 | header->pmode_entry = (u32)&wakeup_pmode_return; | |
85 | header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); | |
86 | saved_magic = 0x12345678; | |
87 | #else /* CONFIG_64BIT */ | |
88 | header->trampoline_segment = setup_trampoline() >> 4; | |
9cf4f298 | 89 | stack_start.sp = temp_stack + 4096; |
e44b7b75 PM |
90 | initial_code = (unsigned long)wakeup_long64; |
91 | saved_magic = 0x123456789abcdef0; | |
92 | #endif /* CONFIG_64BIT */ | |
4fc2fba8 PM |
93 | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* | |
98 | * acpi_restore_state - undo effects of acpi_save_state_mem | |
99 | */ | |
100 | void acpi_restore_state_mem(void) | |
101 | { | |
102 | } | |
103 | ||
104 | ||
105 | /** | |
106 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation | |
107 | * | |
108 | * We allocate a page from the first 1MB of memory for the wakeup | |
109 | * routine for when we come back from a sleep state. The | |
110 | * runtime allocator allows specification of <16MB pages, but not | |
111 | * <1MB pages. | |
112 | */ | |
113 | void __init acpi_reserve_bootmem(void) | |
114 | { | |
e44b7b75 | 115 | if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
4fc2fba8 PM |
116 | printk(KERN_ERR |
117 | "ACPI: Wakeup code way too big, S3 disabled.\n"); | |
118 | return; | |
119 | } | |
120 | ||
e44b7b75 PM |
121 | acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); |
122 | ||
123 | if (!acpi_realmode) { | |
4fc2fba8 | 124 | printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
e44b7b75 PM |
125 | return; |
126 | } | |
127 | ||
4b4f7280 | 128 | acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); |
4fc2fba8 PM |
129 | } |
130 | ||
131 | ||
132 | static int __init acpi_sleep_setup(char *str) | |
133 | { | |
134 | while ((str != NULL) && (*str != '\0')) { | |
135 | if (strncmp(str, "s3_bios", 7) == 0) | |
136 | acpi_realmode_flags |= 1; | |
137 | if (strncmp(str, "s3_mode", 7) == 0) | |
138 | acpi_realmode_flags |= 2; | |
139 | if (strncmp(str, "s3_beep", 7) == 0) | |
140 | acpi_realmode_flags |= 4; | |
141 | str = strchr(str, ','); | |
142 | if (str != NULL) | |
143 | str += strspn(str, ", \t"); | |
144 | } | |
145 | return 1; | |
146 | } | |
147 | ||
148 | __setup("acpi_sleep=", acpi_sleep_setup); |