Commit | Line | Data |
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1da177e4 | 1 | /* |
cf7700fe | 2 | * Suspend and hibernation support for x86-64 |
1da177e4 LT |
3 | * |
4 | * Distribute under GPLv2 | |
5 | * | |
cf7700fe | 6 | * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl> |
1da177e4 LT |
7 | * Copyright (c) 2002 Pavel Machek <pavel@suse.cz> |
8 | * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org> | |
9 | */ | |
10 | ||
55679edb | 11 | #include <linux/smp.h> |
1da177e4 | 12 | #include <linux/suspend.h> |
1da177e4 | 13 | #include <asm/proto.h> |
3dd08325 RW |
14 | #include <asm/page.h> |
15 | #include <asm/pgtable.h> | |
3ebad590 | 16 | #include <asm/mtrr.h> |
83b8e28b | 17 | #include <asm/xcr.h> |
a8af7898 | 18 | #include <asm/suspend.h> |
1da177e4 | 19 | |
cae45957 JB |
20 | static void fix_processor_context(void); |
21 | ||
1da177e4 LT |
22 | struct saved_context saved_context; |
23 | ||
5c9c9bec RW |
24 | /** |
25 | * __save_processor_state - save CPU registers before creating a | |
26 | * hibernation image and before restoring the memory state from it | |
27 | * @ctxt - structure to store the registers contents in | |
28 | * | |
29 | * NOTE: If there is a CPU register the modification of which by the | |
30 | * boot kernel (ie. the kernel used for loading the hibernation image) | |
31 | * might affect the operations of the restored target kernel (ie. the one | |
32 | * saved in the hibernation image), then its contents must be saved by this | |
33 | * function. In other words, if kernel A is hibernated and different | |
34 | * kernel B is used for loading the hibernation image into memory, the | |
35 | * kernel A's __save_processor_state() function must save all registers | |
36 | * needed by kernel A, so that it can operate correctly after the resume | |
37 | * regardless of what kernel B does in the meantime. | |
38 | */ | |
cae45957 | 39 | static void __save_processor_state(struct saved_context *ctxt) |
1da177e4 LT |
40 | { |
41 | kernel_fpu_begin(); | |
42 | ||
43 | /* | |
44 | * descriptor tables | |
45 | */ | |
9d1c6e7c GOC |
46 | store_gdt((struct desc_ptr *)&ctxt->gdt_limit); |
47 | store_idt((struct desc_ptr *)&ctxt->idt_limit); | |
48 | store_tr(ctxt->tr); | |
1da177e4 LT |
49 | |
50 | /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */ | |
1da177e4 LT |
51 | /* |
52 | * segment registers | |
53 | */ | |
54 | asm volatile ("movw %%ds, %0" : "=m" (ctxt->ds)); | |
55 | asm volatile ("movw %%es, %0" : "=m" (ctxt->es)); | |
56 | asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs)); | |
57 | asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs)); | |
58 | asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss)); | |
59 | ||
60 | rdmsrl(MSR_FS_BASE, ctxt->fs_base); | |
61 | rdmsrl(MSR_GS_BASE, ctxt->gs_base); | |
62 | rdmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base); | |
3ebad590 | 63 | mtrr_save_fixed_ranges(NULL); |
1da177e4 LT |
64 | |
65 | /* | |
cf7700fe | 66 | * control registers |
1da177e4 | 67 | */ |
3c321bce | 68 | rdmsrl(MSR_EFER, ctxt->efer); |
f51c9452 GOC |
69 | ctxt->cr0 = read_cr0(); |
70 | ctxt->cr2 = read_cr2(); | |
71 | ctxt->cr3 = read_cr3(); | |
72 | ctxt->cr4 = read_cr4(); | |
73 | ctxt->cr8 = read_cr8(); | |
1da177e4 LT |
74 | } |
75 | ||
76 | void save_processor_state(void) | |
77 | { | |
78 | __save_processor_state(&saved_context); | |
79 | } | |
80 | ||
08967f94 | 81 | static void do_fpu_end(void) |
1da177e4 | 82 | { |
08967f94 SL |
83 | /* |
84 | * Restore FPU regs if necessary | |
85 | */ | |
86 | kernel_fpu_end(); | |
1da177e4 LT |
87 | } |
88 | ||
5c9c9bec RW |
89 | /** |
90 | * __restore_processor_state - restore the contents of CPU registers saved | |
91 | * by __save_processor_state() | |
92 | * @ctxt - structure to load the registers contents from | |
93 | */ | |
cae45957 | 94 | static void __restore_processor_state(struct saved_context *ctxt) |
1da177e4 LT |
95 | { |
96 | /* | |
97 | * control registers | |
98 | */ | |
3c321bce | 99 | wrmsrl(MSR_EFER, ctxt->efer); |
f51c9452 GOC |
100 | write_cr8(ctxt->cr8); |
101 | write_cr4(ctxt->cr4); | |
102 | write_cr3(ctxt->cr3); | |
103 | write_cr2(ctxt->cr2); | |
104 | write_cr0(ctxt->cr0); | |
1da177e4 | 105 | |
8d783b3e PM |
106 | /* |
107 | * now restore the descriptor tables to their proper values | |
108 | * ltr is done i fix_processor_context(). | |
109 | */ | |
9d1c6e7c GOC |
110 | load_gdt((const struct desc_ptr *)&ctxt->gdt_limit); |
111 | load_idt((const struct desc_ptr *)&ctxt->idt_limit); | |
112 | ||
8d783b3e | 113 | |
1da177e4 LT |
114 | /* |
115 | * segment registers | |
116 | */ | |
117 | asm volatile ("movw %0, %%ds" :: "r" (ctxt->ds)); | |
118 | asm volatile ("movw %0, %%es" :: "r" (ctxt->es)); | |
119 | asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs)); | |
120 | load_gs_index(ctxt->gs); | |
121 | asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss)); | |
122 | ||
123 | wrmsrl(MSR_FS_BASE, ctxt->fs_base); | |
124 | wrmsrl(MSR_GS_BASE, ctxt->gs_base); | |
125 | wrmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base); | |
126 | ||
83b8e28b SS |
127 | /* |
128 | * restore XCR0 for xsave capable cpu's. | |
129 | */ | |
130 | if (cpu_has_xsave) | |
131 | xsetbv(XCR_XFEATURE_ENABLED_MASK, pcntxt_mask); | |
132 | ||
1da177e4 LT |
133 | fix_processor_context(); |
134 | ||
135 | do_fpu_end(); | |
3b520b23 | 136 | mtrr_ap_init(); |
1da177e4 LT |
137 | } |
138 | ||
139 | void restore_processor_state(void) | |
140 | { | |
141 | __restore_processor_state(&saved_context); | |
142 | } | |
143 | ||
cae45957 | 144 | static void fix_processor_context(void) |
1da177e4 LT |
145 | { |
146 | int cpu = smp_processor_id(); | |
147 | struct tss_struct *t = &per_cpu(init_tss, cpu); | |
148 | ||
17b7a89c BP |
149 | /* |
150 | * This just modifies memory; should not be necessary. But... This | |
151 | * is necessary, because 386 hardware has concept of busy TSS or some | |
152 | * similar stupidity. | |
153 | */ | |
154 | set_tss_desc(cpu, t); | |
1da177e4 | 155 | |
f6dc247c | 156 | get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS].type = 9; |
1da177e4 LT |
157 | |
158 | syscall_init(); /* This sets MSR_*STAR and related */ | |
159 | load_TR_desc(); /* This does ltr */ | |
160 | load_LDT(¤t->active_mm->context); /* This does lldt */ | |
161 | ||
162 | /* | |
163 | * Now maybe reload the debug registers | |
164 | */ | |
165 | if (current->thread.debugreg7){ | |
166 | loaddebug(¤t->thread, 0); | |
167 | loaddebug(¤t->thread, 1); | |
168 | loaddebug(¤t->thread, 2); | |
169 | loaddebug(¤t->thread, 3); | |
170 | /* no 4 and 5 */ | |
171 | loaddebug(¤t->thread, 6); | |
172 | loaddebug(¤t->thread, 7); | |
173 | } | |
1da177e4 | 174 | } |