x86-32, mm: Add an initial page table for core bootstrapping
[deliverable/linux.git] / arch / x86 / kernel / acpi / sleep.c
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1/*
2 * sleep.c - x86-specific ACPI sleep support.
3 *
4 * Copyright (C) 2001-2003 Patrick Mochel
a2531293 5 * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
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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
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15#ifdef CONFIG_X86_32
16#include <asm/pgtable.h>
17#include <asm/pgtable_32.h>
18#endif
19
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20#include "realmode/wakeup.h"
21#include "sleep.h"
4fc2fba8 22
f49688d4 23unsigned long acpi_wakeup_address;
4fc2fba8 24unsigned long acpi_realmode_flags;
4fc2fba8 25
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26/* address in low memory of the wakeup routine. */
27static unsigned long acpi_realmode;
28
9744f5a3 29#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
5000cadc 30static char temp_stack[4096];
e44b7b75 31#endif
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32
33/**
34 * acpi_save_state_mem - save kernel state
35 *
36 * Create an identity mapped page table and copy the wakeup routine to
37 * low memory.
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38 *
39 * Note that this is too late to change acpi_wakeup_address.
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40 */
41int acpi_save_state_mem(void)
42{
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43 struct wakeup_header *header;
44
45 if (!acpi_realmode) {
46 printk(KERN_ERR "Could not allocate memory during boot, "
47 "S3 disabled\n");
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48 return -ENOMEM;
49 }
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50 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
51
52 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
53 if (header->signature != 0x51ee1111) {
54 printk(KERN_ERR "wakeup header does not match\n");
55 return -EINVAL;
56 }
57
58 header->video_mode = saved_video_mode;
59
4b4f7280 60 header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
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61
62 /*
63 * Set up the wakeup GDT. We set these up as Big Real Mode,
64 * that is, with limits set to 4 GB. At least the Lenovo
65 * Thinkpad X61 is known to need this for the video BIOS
66 * initialization quirk to work; this is likely to also
67 * be the case for other laptops or integrated video devices.
68 */
69
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70 /* GDT[0]: GDT self-pointer */
71 header->wakeup_gdt[0] =
72 (u64)(sizeof(header->wakeup_gdt) - 1) +
73 ((u64)(acpi_wakeup_address +
74 ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
75 << 16);
065cb3df 76 /* GDT[1]: big real mode-like code segment */
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77 header->wakeup_gdt[1] =
78 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
065cb3df 79 /* GDT[2]: big real mode-like data segment */
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80 header->wakeup_gdt[2] =
81 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
4b4f7280 82
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83#ifndef CONFIG_64BIT
84 store_gdt((struct desc_ptr *)&header->pmode_gdt);
85
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86 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
87 &header->pmode_efer_high))
88 header->pmode_efer_low = header->pmode_efer_high = 0;
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89#endif /* !CONFIG_64BIT */
90
91 header->pmode_cr0 = read_cr0();
e532c06f 92 header->pmode_cr4 = read_cr4_safe();
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93 header->realmode_flags = acpi_realmode_flags;
94 header->real_magic = 0x12345678;
95
96#ifndef CONFIG_64BIT
97 header->pmode_entry = (u32)&wakeup_pmode_return;
b40827fa 98 header->pmode_cr3 = (u32)__pa(&initial_page_table);
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99 saved_magic = 0x12345678;
100#else /* CONFIG_64BIT */
101 header->trampoline_segment = setup_trampoline() >> 4;
1ea598c2 102#ifdef CONFIG_SMP
d0d0f743 103 stack_start.sp = temp_stack + sizeof(temp_stack);
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104 early_gdt_descr.address =
105 (unsigned long)get_cpu_gdt_table(smp_processor_id());
004aa322 106 initial_gs = per_cpu_offset(smp_processor_id());
1ea598c2 107#endif
e44b7b75 108 initial_code = (unsigned long)wakeup_long64;
ce4b3c55 109 saved_magic = 0x123456789abcdef0L;
e44b7b75 110#endif /* CONFIG_64BIT */
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111
112 return 0;
113}
114
115/*
116 * acpi_restore_state - undo effects of acpi_save_state_mem
117 */
118void acpi_restore_state_mem(void)
119{
120}
121
122
123/**
196cf0d6 124 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
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125 *
126 * We allocate a page from the first 1MB of memory for the wakeup
127 * routine for when we come back from a sleep state. The
128 * runtime allocator allows specification of <16MB pages, but not
129 * <1MB pages.
130 */
196cf0d6 131void __init acpi_reserve_wakeup_memory(void)
4fc2fba8 132{
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133 unsigned long mem;
134
e44b7b75 135 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
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136 printk(KERN_ERR
137 "ACPI: Wakeup code way too big, S3 disabled.\n");
138 return;
139 }
140
196cf0d6 141 mem = find_e820_area(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
e44b7b75 142
196cf0d6 143 if (mem == -1L) {
4fc2fba8 144 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
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145 return;
146 }
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147 acpi_realmode = (unsigned long) phys_to_virt(mem);
148 acpi_wakeup_address = mem;
149 reserve_early(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
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150}
151
152
153static int __init acpi_sleep_setup(char *str)
154{
155 while ((str != NULL) && (*str != '\0')) {
156 if (strncmp(str, "s3_bios", 7) == 0)
157 acpi_realmode_flags |= 1;
158 if (strncmp(str, "s3_mode", 7) == 0)
159 acpi_realmode_flags |= 2;
160 if (strncmp(str, "s3_beep", 7) == 0)
161 acpi_realmode_flags |= 4;
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162#ifdef CONFIG_HIBERNATION
163 if (strncmp(str, "s4_nohwsig", 10) == 0)
164 acpi_no_s4_hw_signature();
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165 if (strncmp(str, "s4_nonvs", 8) == 0) {
166 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
167 "please use acpi_sleep=nonvs instead");
168 acpi_nvs_nosave();
169 }
bdfe6b7c 170#endif
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171 if (strncmp(str, "nonvs", 5) == 0)
172 acpi_nvs_nosave();
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173 if (strncmp(str, "old_ordering", 12) == 0)
174 acpi_old_suspend_ordering();
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175 str = strchr(str, ',');
176 if (str != NULL)
177 str += strspn(str, ", \t");
178 }
179 return 1;
180}
181
182__setup("acpi_sleep=", acpi_sleep_setup);
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