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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> | |
4fdf08b5 | 12 | #include <asm/segment.h> |
3038edab | 13 | #include <asm/desc.h> |
4fc2fba8 | 14 | |
e44b7b75 PM |
15 | #include "realmode/wakeup.h" |
16 | #include "sleep.h" | |
4fc2fba8 | 17 | |
f49688d4 | 18 | unsigned long acpi_wakeup_address; |
4fc2fba8 | 19 | unsigned long acpi_realmode_flags; |
4fc2fba8 | 20 | |
e44b7b75 PM |
21 | /* address in low memory of the wakeup routine. */ |
22 | static unsigned long acpi_realmode; | |
23 | ||
9744f5a3 | 24 | #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) |
5000cadc | 25 | static char temp_stack[4096]; |
e44b7b75 | 26 | #endif |
4fc2fba8 PM |
27 | |
28 | /** | |
29 | * acpi_save_state_mem - save kernel state | |
30 | * | |
31 | * Create an identity mapped page table and copy the wakeup routine to | |
32 | * low memory. | |
e44b7b75 PM |
33 | * |
34 | * Note that this is too late to change acpi_wakeup_address. | |
4fc2fba8 PM |
35 | */ |
36 | int acpi_save_state_mem(void) | |
37 | { | |
e44b7b75 PM |
38 | struct wakeup_header *header; |
39 | ||
40 | if (!acpi_realmode) { | |
41 | printk(KERN_ERR "Could not allocate memory during boot, " | |
42 | "S3 disabled\n"); | |
4fc2fba8 PM |
43 | return -ENOMEM; |
44 | } | |
e44b7b75 PM |
45 | memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); |
46 | ||
47 | header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); | |
48 | if (header->signature != 0x51ee1111) { | |
49 | printk(KERN_ERR "wakeup header does not match\n"); | |
50 | return -EINVAL; | |
51 | } | |
52 | ||
53 | header->video_mode = saved_video_mode; | |
54 | ||
4b4f7280 | 55 | header->wakeup_jmp_seg = acpi_wakeup_address >> 4; |
065cb3df PA |
56 | |
57 | /* | |
58 | * Set up the wakeup GDT. We set these up as Big Real Mode, | |
59 | * that is, with limits set to 4 GB. At least the Lenovo | |
60 | * Thinkpad X61 is known to need this for the video BIOS | |
61 | * initialization quirk to work; this is likely to also | |
62 | * be the case for other laptops or integrated video devices. | |
63 | */ | |
64 | ||
4b4f7280 PA |
65 | /* GDT[0]: GDT self-pointer */ |
66 | header->wakeup_gdt[0] = | |
67 | (u64)(sizeof(header->wakeup_gdt) - 1) + | |
68 | ((u64)(acpi_wakeup_address + | |
69 | ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) | |
70 | << 16); | |
065cb3df | 71 | /* GDT[1]: big real mode-like code segment */ |
3bf2e774 PA |
72 | header->wakeup_gdt[1] = |
73 | GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); | |
065cb3df | 74 | /* GDT[2]: big real mode-like data segment */ |
3bf2e774 PA |
75 | header->wakeup_gdt[2] = |
76 | GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); | |
4b4f7280 | 77 | |
e44b7b75 PM |
78 | #ifndef CONFIG_64BIT |
79 | store_gdt((struct desc_ptr *)&header->pmode_gdt); | |
80 | ||
81 | header->pmode_efer_low = nx_enabled; | |
82 | if (header->pmode_efer_low & 1) { | |
83 | /* This is strange, why not save efer, always? */ | |
84 | rdmsr(MSR_EFER, header->pmode_efer_low, | |
85 | header->pmode_efer_high); | |
86 | } | |
87 | #endif /* !CONFIG_64BIT */ | |
88 | ||
89 | header->pmode_cr0 = read_cr0(); | |
e532c06f | 90 | header->pmode_cr4 = read_cr4_safe(); |
e44b7b75 PM |
91 | header->realmode_flags = acpi_realmode_flags; |
92 | header->real_magic = 0x12345678; | |
93 | ||
94 | #ifndef CONFIG_64BIT | |
95 | header->pmode_entry = (u32)&wakeup_pmode_return; | |
96 | header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); | |
97 | saved_magic = 0x12345678; | |
98 | #else /* CONFIG_64BIT */ | |
99 | header->trampoline_segment = setup_trampoline() >> 4; | |
1ea598c2 | 100 | #ifdef CONFIG_SMP |
d0d0f743 | 101 | stack_start.sp = temp_stack + sizeof(temp_stack); |
3038edab RW |
102 | early_gdt_descr.address = |
103 | (unsigned long)get_cpu_gdt_table(smp_processor_id()); | |
004aa322 | 104 | initial_gs = per_cpu_offset(smp_processor_id()); |
1ea598c2 | 105 | #endif |
e44b7b75 PM |
106 | initial_code = (unsigned long)wakeup_long64; |
107 | saved_magic = 0x123456789abcdef0; | |
108 | #endif /* CONFIG_64BIT */ | |
4fc2fba8 PM |
109 | |
110 | return 0; | |
111 | } | |
112 | ||
113 | /* | |
114 | * acpi_restore_state - undo effects of acpi_save_state_mem | |
115 | */ | |
116 | void acpi_restore_state_mem(void) | |
117 | { | |
118 | } | |
119 | ||
120 | ||
121 | /** | |
122 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation | |
123 | * | |
124 | * We allocate a page from the first 1MB of memory for the wakeup | |
125 | * routine for when we come back from a sleep state. The | |
126 | * runtime allocator allows specification of <16MB pages, but not | |
127 | * <1MB pages. | |
128 | */ | |
129 | void __init acpi_reserve_bootmem(void) | |
130 | { | |
e44b7b75 | 131 | if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
4fc2fba8 PM |
132 | printk(KERN_ERR |
133 | "ACPI: Wakeup code way too big, S3 disabled.\n"); | |
134 | return; | |
135 | } | |
136 | ||
e44b7b75 PM |
137 | acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); |
138 | ||
139 | if (!acpi_realmode) { | |
4fc2fba8 | 140 | printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
e44b7b75 PM |
141 | return; |
142 | } | |
143 | ||
4b4f7280 | 144 | acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); |
4fc2fba8 PM |
145 | } |
146 | ||
147 | ||
148 | static int __init acpi_sleep_setup(char *str) | |
149 | { | |
150 | while ((str != NULL) && (*str != '\0')) { | |
151 | if (strncmp(str, "s3_bios", 7) == 0) | |
152 | acpi_realmode_flags |= 1; | |
153 | if (strncmp(str, "s3_mode", 7) == 0) | |
154 | acpi_realmode_flags |= 2; | |
155 | if (strncmp(str, "s3_beep", 7) == 0) | |
156 | acpi_realmode_flags |= 4; | |
bdfe6b7c SL |
157 | #ifdef CONFIG_HIBERNATION |
158 | if (strncmp(str, "s4_nohwsig", 10) == 0) | |
159 | acpi_no_s4_hw_signature(); | |
5d8b532a RW |
160 | if (strncmp(str, "s4_nonvs", 8) == 0) |
161 | acpi_s4_no_nvs(); | |
bdfe6b7c | 162 | #endif |
d8f3de0d RW |
163 | if (strncmp(str, "old_ordering", 12) == 0) |
164 | acpi_old_suspend_ordering(); | |
4fc2fba8 PM |
165 | str = strchr(str, ','); |
166 | if (str != NULL) | |
167 | str += strspn(str, ", \t"); | |
168 | } | |
169 | return 1; | |
170 | } | |
171 | ||
172 | __setup("acpi_sleep=", acpi_sleep_setup); |