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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@ucw.cz> | |
6 | */ | |
7 | ||
8 | #include <linux/acpi.h> | |
9 | #include <linux/bootmem.h> | |
10 | #include <linux/memblock.h> | |
11 | #include <linux/dmi.h> | |
12 | #include <linux/cpumask.h> | |
13 | #include <asm/segment.h> | |
14 | #include <asm/desc.h> | |
15 | #include <asm/pgtable.h> | |
16 | #include <asm/cacheflush.h> | |
17 | #include <asm/realmode.h> | |
18 | ||
19 | #include <linux/ftrace.h> | |
20 | #include "../../realmode/rm/wakeup.h" | |
21 | #include "sleep.h" | |
22 | ||
23 | unsigned long acpi_realmode_flags; | |
24 | ||
25 | #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) | |
26 | static char temp_stack[4096]; | |
27 | #endif | |
28 | ||
29 | /** | |
30 | * x86_acpi_enter_sleep_state - enter sleep state | |
31 | * @state: Sleep state to enter. | |
32 | * | |
33 | * Wrapper around acpi_enter_sleep_state() to be called by assmebly. | |
34 | */ | |
35 | acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state) | |
36 | { | |
37 | return acpi_enter_sleep_state(state); | |
38 | } | |
39 | ||
40 | /** | |
41 | * x86_acpi_suspend_lowlevel - save kernel state | |
42 | * | |
43 | * Create an identity mapped page table and copy the wakeup routine to | |
44 | * low memory. | |
45 | */ | |
46 | int x86_acpi_suspend_lowlevel(void) | |
47 | { | |
48 | struct wakeup_header *header = | |
49 | (struct wakeup_header *) __va(real_mode_header->wakeup_header); | |
50 | ||
51 | if (header->signature != WAKEUP_HEADER_SIGNATURE) { | |
52 | printk(KERN_ERR "wakeup header does not match\n"); | |
53 | return -EINVAL; | |
54 | } | |
55 | ||
56 | header->video_mode = saved_video_mode; | |
57 | ||
58 | header->pmode_behavior = 0; | |
59 | ||
60 | #ifndef CONFIG_64BIT | |
61 | native_store_gdt((struct desc_ptr *)&header->pmode_gdt); | |
62 | ||
63 | /* | |
64 | * We have to check that we can write back the value, and not | |
65 | * just read it. At least on 90 nm Pentium M (Family 6, Model | |
66 | * 13), reading an invalid MSR is not guaranteed to trap, see | |
67 | * Erratum X4 in "Intel Pentium M Processor on 90 nm Process | |
68 | * with 2-MB L2 Cache and IntelĀ® Processor A100 and A110 on 90 | |
69 | * nm process with 512-KB L2 Cache Specification Update". | |
70 | */ | |
71 | if (!rdmsr_safe(MSR_EFER, | |
72 | &header->pmode_efer_low, | |
73 | &header->pmode_efer_high) && | |
74 | !wrmsr_safe(MSR_EFER, | |
75 | header->pmode_efer_low, | |
76 | header->pmode_efer_high)) | |
77 | header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER); | |
78 | #endif /* !CONFIG_64BIT */ | |
79 | ||
80 | header->pmode_cr0 = read_cr0(); | |
81 | if (__this_cpu_read(cpu_info.cpuid_level) >= 0) { | |
82 | header->pmode_cr4 = __read_cr4(); | |
83 | header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4); | |
84 | } | |
85 | if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, | |
86 | &header->pmode_misc_en_low, | |
87 | &header->pmode_misc_en_high) && | |
88 | !wrmsr_safe(MSR_IA32_MISC_ENABLE, | |
89 | header->pmode_misc_en_low, | |
90 | header->pmode_misc_en_high)) | |
91 | header->pmode_behavior |= | |
92 | (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); | |
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; | |
98 | header->pmode_cr3 = (u32)__pa_symbol(initial_page_table); | |
99 | saved_magic = 0x12345678; | |
100 | #else /* CONFIG_64BIT */ | |
101 | #ifdef CONFIG_SMP | |
102 | stack_start = (unsigned long)temp_stack + sizeof(temp_stack); | |
103 | early_gdt_descr.address = | |
104 | (unsigned long)get_cpu_gdt_table(smp_processor_id()); | |
105 | initial_gs = per_cpu_offset(smp_processor_id()); | |
106 | #endif | |
107 | initial_code = (unsigned long)wakeup_long64; | |
108 | saved_magic = 0x123456789abcdef0L; | |
109 | #endif /* CONFIG_64BIT */ | |
110 | ||
111 | /* | |
112 | * Pause/unpause graph tracing around do_suspend_lowlevel as it has | |
113 | * inconsistent call/return info after it jumps to the wakeup vector. | |
114 | */ | |
115 | pause_graph_tracing(); | |
116 | do_suspend_lowlevel(); | |
117 | unpause_graph_tracing(); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int __init acpi_sleep_setup(char *str) | |
122 | { | |
123 | while ((str != NULL) && (*str != '\0')) { | |
124 | if (strncmp(str, "s3_bios", 7) == 0) | |
125 | acpi_realmode_flags |= 1; | |
126 | if (strncmp(str, "s3_mode", 7) == 0) | |
127 | acpi_realmode_flags |= 2; | |
128 | if (strncmp(str, "s3_beep", 7) == 0) | |
129 | acpi_realmode_flags |= 4; | |
130 | #ifdef CONFIG_HIBERNATION | |
131 | if (strncmp(str, "s4_nohwsig", 10) == 0) | |
132 | acpi_no_s4_hw_signature(); | |
133 | #endif | |
134 | if (strncmp(str, "nonvs", 5) == 0) | |
135 | acpi_nvs_nosave(); | |
136 | if (strncmp(str, "nonvs_s3", 8) == 0) | |
137 | acpi_nvs_nosave_s3(); | |
138 | if (strncmp(str, "old_ordering", 12) == 0) | |
139 | acpi_old_suspend_ordering(); | |
140 | str = strchr(str, ','); | |
141 | if (str != NULL) | |
142 | str += strspn(str, ", \t"); | |
143 | } | |
144 | return 1; | |
145 | } | |
146 | ||
147 | __setup("acpi_sleep=", acpi_sleep_setup); |