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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 | 25 | |
3bf2e774 PA |
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 | ||
4fc2fba8 PM |
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. | |
e44b7b75 PM |
40 | * |
41 | * Note that this is too late to change acpi_wakeup_address. | |
4fc2fba8 PM |
42 | */ |
43 | int acpi_save_state_mem(void) | |
44 | { | |
e44b7b75 PM |
45 | struct wakeup_header *header; |
46 | ||
47 | if (!acpi_realmode) { | |
48 | printk(KERN_ERR "Could not allocate memory during boot, " | |
49 | "S3 disabled\n"); | |
4fc2fba8 PM |
50 | return -ENOMEM; |
51 | } | |
e44b7b75 PM |
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 | ||
4b4f7280 PA |
62 | header->wakeup_jmp_seg = acpi_wakeup_address >> 4; |
63 | /* GDT[0]: GDT self-pointer */ | |
64 | header->wakeup_gdt[0] = | |
65 | (u64)(sizeof(header->wakeup_gdt) - 1) + | |
66 | ((u64)(acpi_wakeup_address + | |
67 | ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) | |
68 | << 16); | |
69 | /* GDT[1]: real-mode-like code segment */ | |
3bf2e774 PA |
70 | header->wakeup_gdt[1] = |
71 | GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); | |
4b4f7280 | 72 | /* GDT[2]: real-mode-like data segment */ |
3bf2e774 PA |
73 | header->wakeup_gdt[2] = |
74 | GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); | |
4b4f7280 | 75 | |
e44b7b75 PM |
76 | #ifndef CONFIG_64BIT |
77 | store_gdt((struct desc_ptr *)&header->pmode_gdt); | |
78 | ||
79 | header->pmode_efer_low = nx_enabled; | |
80 | if (header->pmode_efer_low & 1) { | |
81 | /* This is strange, why not save efer, always? */ | |
82 | rdmsr(MSR_EFER, header->pmode_efer_low, | |
83 | header->pmode_efer_high); | |
84 | } | |
85 | #endif /* !CONFIG_64BIT */ | |
86 | ||
87 | header->pmode_cr0 = read_cr0(); | |
88 | header->pmode_cr4 = read_cr4(); | |
89 | header->realmode_flags = acpi_realmode_flags; | |
90 | header->real_magic = 0x12345678; | |
91 | ||
92 | #ifndef CONFIG_64BIT | |
93 | header->pmode_entry = (u32)&wakeup_pmode_return; | |
94 | header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); | |
95 | saved_magic = 0x12345678; | |
96 | #else /* CONFIG_64BIT */ | |
97 | header->trampoline_segment = setup_trampoline() >> 4; | |
98 | init_rsp = (unsigned long)temp_stack + 4096; | |
99 | initial_code = (unsigned long)wakeup_long64; | |
100 | saved_magic = 0x123456789abcdef0; | |
101 | #endif /* CONFIG_64BIT */ | |
4fc2fba8 PM |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* | |
107 | * acpi_restore_state - undo effects of acpi_save_state_mem | |
108 | */ | |
109 | void acpi_restore_state_mem(void) | |
110 | { | |
111 | } | |
112 | ||
113 | ||
114 | /** | |
115 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation | |
116 | * | |
117 | * We allocate a page from the first 1MB of memory for the wakeup | |
118 | * routine for when we come back from a sleep state. The | |
119 | * runtime allocator allows specification of <16MB pages, but not | |
120 | * <1MB pages. | |
121 | */ | |
122 | void __init acpi_reserve_bootmem(void) | |
123 | { | |
e44b7b75 | 124 | if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
4fc2fba8 PM |
125 | printk(KERN_ERR |
126 | "ACPI: Wakeup code way too big, S3 disabled.\n"); | |
127 | return; | |
128 | } | |
129 | ||
e44b7b75 PM |
130 | acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); |
131 | ||
132 | if (!acpi_realmode) { | |
4fc2fba8 | 133 | printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
e44b7b75 PM |
134 | return; |
135 | } | |
136 | ||
4b4f7280 | 137 | acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); |
4fc2fba8 PM |
138 | } |
139 | ||
140 | ||
141 | static int __init acpi_sleep_setup(char *str) | |
142 | { | |
143 | while ((str != NULL) && (*str != '\0')) { | |
144 | if (strncmp(str, "s3_bios", 7) == 0) | |
145 | acpi_realmode_flags |= 1; | |
146 | if (strncmp(str, "s3_mode", 7) == 0) | |
147 | acpi_realmode_flags |= 2; | |
148 | if (strncmp(str, "s3_beep", 7) == 0) | |
149 | acpi_realmode_flags |= 4; | |
150 | str = strchr(str, ','); | |
151 | if (str != NULL) | |
152 | str += strspn(str, ", \t"); | |
153 | } | |
154 | return 1; | |
155 | } | |
156 | ||
157 | __setup("acpi_sleep=", acpi_sleep_setup); |