Commit | Line | Data |
---|---|---|
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> | |
4fdf08b5 | 12 | #include <asm/segment.h> |
4fc2fba8 | 13 | |
e44b7b75 PM |
14 | #include "realmode/wakeup.h" |
15 | #include "sleep.h" | |
4fc2fba8 | 16 | |
f49688d4 | 17 | unsigned long acpi_wakeup_address; |
4fc2fba8 | 18 | unsigned long acpi_realmode_flags; |
4fc2fba8 | 19 | |
e44b7b75 PM |
20 | /* address in low memory of the wakeup routine. */ |
21 | static unsigned long acpi_realmode; | |
22 | ||
9744f5a3 | 23 | #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) |
e44b7b75 PM |
24 | static char temp_stack[10240]; |
25 | #endif | |
4fc2fba8 PM |
26 | |
27 | /** | |
28 | * acpi_save_state_mem - save kernel state | |
29 | * | |
30 | * Create an identity mapped page table and copy the wakeup routine to | |
31 | * low memory. | |
e44b7b75 PM |
32 | * |
33 | * Note that this is too late to change acpi_wakeup_address. | |
4fc2fba8 PM |
34 | */ |
35 | int acpi_save_state_mem(void) | |
36 | { | |
e44b7b75 PM |
37 | struct wakeup_header *header; |
38 | ||
39 | if (!acpi_realmode) { | |
40 | printk(KERN_ERR "Could not allocate memory during boot, " | |
41 | "S3 disabled\n"); | |
4fc2fba8 PM |
42 | return -ENOMEM; |
43 | } | |
e44b7b75 PM |
44 | memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); |
45 | ||
46 | header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); | |
47 | if (header->signature != 0x51ee1111) { | |
48 | printk(KERN_ERR "wakeup header does not match\n"); | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
52 | header->video_mode = saved_video_mode; | |
53 | ||
4b4f7280 | 54 | header->wakeup_jmp_seg = acpi_wakeup_address >> 4; |
065cb3df PA |
55 | |
56 | /* | |
57 | * Set up the wakeup GDT. We set these up as Big Real Mode, | |
58 | * that is, with limits set to 4 GB. At least the Lenovo | |
59 | * Thinkpad X61 is known to need this for the video BIOS | |
60 | * initialization quirk to work; this is likely to also | |
61 | * be the case for other laptops or integrated video devices. | |
62 | */ | |
63 | ||
4b4f7280 PA |
64 | /* GDT[0]: GDT self-pointer */ |
65 | header->wakeup_gdt[0] = | |
66 | (u64)(sizeof(header->wakeup_gdt) - 1) + | |
67 | ((u64)(acpi_wakeup_address + | |
68 | ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) | |
69 | << 16); | |
065cb3df | 70 | /* GDT[1]: big real mode-like code segment */ |
3bf2e774 PA |
71 | header->wakeup_gdt[1] = |
72 | GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); | |
065cb3df | 73 | /* GDT[2]: big real mode-like data segment */ |
3bf2e774 PA |
74 | header->wakeup_gdt[2] = |
75 | GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); | |
4b4f7280 | 76 | |
e44b7b75 PM |
77 | #ifndef CONFIG_64BIT |
78 | store_gdt((struct desc_ptr *)&header->pmode_gdt); | |
79 | ||
80 | header->pmode_efer_low = nx_enabled; | |
81 | if (header->pmode_efer_low & 1) { | |
82 | /* This is strange, why not save efer, always? */ | |
83 | rdmsr(MSR_EFER, header->pmode_efer_low, | |
84 | header->pmode_efer_high); | |
85 | } | |
86 | #endif /* !CONFIG_64BIT */ | |
87 | ||
88 | header->pmode_cr0 = read_cr0(); | |
e532c06f | 89 | header->pmode_cr4 = read_cr4_safe(); |
e44b7b75 PM |
90 | header->realmode_flags = acpi_realmode_flags; |
91 | header->real_magic = 0x12345678; | |
92 | ||
93 | #ifndef CONFIG_64BIT | |
94 | header->pmode_entry = (u32)&wakeup_pmode_return; | |
95 | header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); | |
96 | saved_magic = 0x12345678; | |
97 | #else /* CONFIG_64BIT */ | |
98 | header->trampoline_segment = setup_trampoline() >> 4; | |
1ea598c2 | 99 | #ifdef CONFIG_SMP |
9cf4f298 | 100 | stack_start.sp = temp_stack + 4096; |
1ea598c2 | 101 | #endif |
e44b7b75 PM |
102 | initial_code = (unsigned long)wakeup_long64; |
103 | saved_magic = 0x123456789abcdef0; | |
104 | #endif /* CONFIG_64BIT */ | |
4fc2fba8 PM |
105 | |
106 | return 0; | |
107 | } | |
108 | ||
109 | /* | |
110 | * acpi_restore_state - undo effects of acpi_save_state_mem | |
111 | */ | |
112 | void acpi_restore_state_mem(void) | |
113 | { | |
114 | } | |
115 | ||
116 | ||
117 | /** | |
118 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation | |
119 | * | |
120 | * We allocate a page from the first 1MB of memory for the wakeup | |
121 | * routine for when we come back from a sleep state. The | |
122 | * runtime allocator allows specification of <16MB pages, but not | |
123 | * <1MB pages. | |
124 | */ | |
125 | void __init acpi_reserve_bootmem(void) | |
126 | { | |
e44b7b75 | 127 | if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
4fc2fba8 PM |
128 | printk(KERN_ERR |
129 | "ACPI: Wakeup code way too big, S3 disabled.\n"); | |
130 | return; | |
131 | } | |
132 | ||
e44b7b75 PM |
133 | acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); |
134 | ||
135 | if (!acpi_realmode) { | |
4fc2fba8 | 136 | printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
e44b7b75 PM |
137 | return; |
138 | } | |
139 | ||
4b4f7280 | 140 | acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); |
4fc2fba8 PM |
141 | } |
142 | ||
143 | ||
144 | static int __init acpi_sleep_setup(char *str) | |
145 | { | |
146 | while ((str != NULL) && (*str != '\0')) { | |
147 | if (strncmp(str, "s3_bios", 7) == 0) | |
148 | acpi_realmode_flags |= 1; | |
149 | if (strncmp(str, "s3_mode", 7) == 0) | |
150 | acpi_realmode_flags |= 2; | |
151 | if (strncmp(str, "s3_beep", 7) == 0) | |
152 | acpi_realmode_flags |= 4; | |
bdfe6b7c SL |
153 | #ifdef CONFIG_HIBERNATION |
154 | if (strncmp(str, "s4_nohwsig", 10) == 0) | |
155 | acpi_no_s4_hw_signature(); | |
156 | #endif | |
d8f3de0d RW |
157 | if (strncmp(str, "old_ordering", 12) == 0) |
158 | acpi_old_suspend_ordering(); | |
4fc2fba8 PM |
159 | str = strchr(str, ','); |
160 | if (str != NULL) | |
161 | str += strspn(str, ", \t"); | |
162 | } | |
163 | return 1; | |
164 | } | |
165 | ||
166 | __setup("acpi_sleep=", acpi_sleep_setup); |