Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
4fc2fba8 PM |
2 | /* |
3 | * sleep.c - x86-specific ACPI sleep support. | |
4 | * | |
5 | * Copyright (C) 2001-2003 Patrick Mochel | |
a2531293 | 6 | * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz> |
4fc2fba8 PM |
7 | */ |
8 | ||
9 | #include <linux/acpi.h> | |
a9ce6bc1 | 10 | #include <linux/memblock.h> |
4fc2fba8 PM |
11 | #include <linux/dmi.h> |
12 | #include <linux/cpumask.h> | |
4fdf08b5 | 13 | #include <asm/segment.h> |
3038edab | 14 | #include <asm/desc.h> |
b40827fa | 15 | #include <asm/pgtable.h> |
d344e38b | 16 | #include <asm/cacheflush.h> |
c9b77ccb | 17 | #include <asm/realmode.h> |
b40827fa | 18 | |
92f9e179 | 19 | #include <linux/ftrace.h> |
c4845474 | 20 | #include "../../realmode/rm/wakeup.h" |
e44b7b75 | 21 | #include "sleep.h" |
4fc2fba8 | 22 | |
4fc2fba8 | 23 | unsigned long acpi_realmode_flags; |
4fc2fba8 | 24 | |
9744f5a3 | 25 | #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) |
5000cadc | 26 | static char temp_stack[4096]; |
e44b7b75 | 27 | #endif |
4fc2fba8 | 28 | |
40bce100 LZ |
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 | */ | |
2605fc21 | 35 | acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state) |
40bce100 LZ |
36 | { |
37 | return acpi_enter_sleep_state(state); | |
38 | } | |
39 | ||
4fc2fba8 | 40 | /** |
d6a77ead | 41 | * x86_acpi_suspend_lowlevel - save kernel state |
4fc2fba8 PM |
42 | * |
43 | * Create an identity mapped page table and copy the wakeup routine to | |
44 | * low memory. | |
45 | */ | |
d6a77ead | 46 | int x86_acpi_suspend_lowlevel(void) |
4fc2fba8 | 47 | { |
c9b77ccb | 48 | struct wakeup_header *header = |
b429dbf6 | 49 | (struct wakeup_header *) __va(real_mode_header->wakeup_header); |
e44b7b75 | 50 | |
d1ee4335 | 51 | if (header->signature != WAKEUP_HEADER_SIGNATURE) { |
e44b7b75 PM |
52 | printk(KERN_ERR "wakeup header does not match\n"); |
53 | return -EINVAL; | |
54 | } | |
55 | ||
56 | header->video_mode = saved_video_mode; | |
57 | ||
73201dbe PA |
58 | header->pmode_behavior = 0; |
59 | ||
e44b7b75 | 60 | #ifndef CONFIG_64BIT |
357d1226 | 61 | native_store_gdt((struct desc_ptr *)&header->pmode_gdt); |
e44b7b75 | 62 | |
5ff560fd PA |
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 | */ | |
73201dbe PA |
71 | if (!rdmsr_safe(MSR_EFER, |
72 | &header->pmode_efer_low, | |
5ff560fd PA |
73 | &header->pmode_efer_high) && |
74 | !wrmsr_safe(MSR_EFER, | |
75 | header->pmode_efer_low, | |
76 | header->pmode_efer_high)) | |
73201dbe | 77 | header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER); |
e44b7b75 PM |
78 | #endif /* !CONFIG_64BIT */ |
79 | ||
80 | header->pmode_cr0 = read_cr0(); | |
73201dbe | 81 | if (__this_cpu_read(cpu_info.cpuid_level) >= 0) { |
1e02ce4c | 82 | header->pmode_cr4 = __read_cr4(); |
73201dbe PA |
83 | header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4); |
84 | } | |
7a313666 KC |
85 | if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, |
86 | &header->pmode_misc_en_low, | |
5ff560fd PA |
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)) | |
7a313666 KC |
91 | header->pmode_behavior |= |
92 | (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); | |
e44b7b75 PM |
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; | |
afd51a0e | 98 | header->pmode_cr3 = (u32)__pa_symbol(initial_page_table); |
e44b7b75 PM |
99 | saved_magic = 0x12345678; |
100 | #else /* CONFIG_64BIT */ | |
1ea598c2 | 101 | #ifdef CONFIG_SMP |
b32f96c7 | 102 | initial_stack = (unsigned long)temp_stack + sizeof(temp_stack); |
3038edab | 103 | early_gdt_descr.address = |
69218e47 | 104 | (unsigned long)get_cpu_gdt_rw(smp_processor_id()); |
004aa322 | 105 | initial_gs = per_cpu_offset(smp_processor_id()); |
1ea598c2 | 106 | #endif |
e44b7b75 | 107 | initial_code = (unsigned long)wakeup_long64; |
ce4b3c55 | 108 | saved_magic = 0x123456789abcdef0L; |
e44b7b75 | 109 | #endif /* CONFIG_64BIT */ |
4fc2fba8 | 110 | |
92f9e179 TB |
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(); | |
f1a2003e | 116 | do_suspend_lowlevel(); |
92f9e179 | 117 | unpause_graph_tracing(); |
4fc2fba8 PM |
118 | return 0; |
119 | } | |
120 | ||
4fc2fba8 PM |
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; | |
bdfe6b7c SL |
130 | #ifdef CONFIG_HIBERNATION |
131 | if (strncmp(str, "s4_nohwsig", 10) == 0) | |
132 | acpi_no_s4_hw_signature(); | |
133 | #endif | |
72ad5d77 RW |
134 | if (strncmp(str, "nonvs", 5) == 0) |
135 | acpi_nvs_nosave(); | |
1bad2f19 KCA |
136 | if (strncmp(str, "nonvs_s3", 8) == 0) |
137 | acpi_nvs_nosave_s3(); | |
d8f3de0d RW |
138 | if (strncmp(str, "old_ordering", 12) == 0) |
139 | acpi_old_suspend_ordering(); | |
57044031 RW |
140 | if (strncmp(str, "nobl", 4) == 0) |
141 | acpi_sleep_no_blacklist(); | |
4fc2fba8 PM |
142 | str = strchr(str, ','); |
143 | if (str != NULL) | |
144 | str += strspn(str, ", \t"); | |
145 | } | |
146 | return 1; | |
147 | } | |
148 | ||
149 | __setup("acpi_sleep=", acpi_sleep_setup); |