Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Suspend support specific for i386. |
| 3 | * |
| 4 | * Distribute under GPLv2 |
| 5 | * |
| 6 | * Copyright (c) 2002 Pavel Machek <pavel@suse.cz> |
| 7 | * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org> |
| 8 | */ |
| 9 | |
Al Viro | 55679ed | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 10 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/suspend.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <asm/proto.h> |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 13 | #include <asm/page.h> |
| 14 | #include <asm/pgtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | struct saved_context saved_context; |
| 17 | |
| 18 | unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx; |
| 19 | unsigned long saved_context_esp, saved_context_ebp, saved_context_esi, saved_context_edi; |
| 20 | unsigned long saved_context_r08, saved_context_r09, saved_context_r10, saved_context_r11; |
| 21 | unsigned long saved_context_r12, saved_context_r13, saved_context_r14, saved_context_r15; |
| 22 | unsigned long saved_context_eflags; |
| 23 | |
| 24 | void __save_processor_state(struct saved_context *ctxt) |
| 25 | { |
| 26 | kernel_fpu_begin(); |
| 27 | |
| 28 | /* |
| 29 | * descriptor tables |
| 30 | */ |
| 31 | asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit)); |
| 32 | asm volatile ("sidt %0" : "=m" (ctxt->idt_limit)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | asm volatile ("str %0" : "=m" (ctxt->tr)); |
| 34 | |
| 35 | /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */ |
| 36 | /* EFER should be constant for kernel version, no need to handle it. */ |
| 37 | /* |
| 38 | * segment registers |
| 39 | */ |
| 40 | asm volatile ("movw %%ds, %0" : "=m" (ctxt->ds)); |
| 41 | asm volatile ("movw %%es, %0" : "=m" (ctxt->es)); |
| 42 | asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs)); |
| 43 | asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs)); |
| 44 | asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss)); |
| 45 | |
| 46 | rdmsrl(MSR_FS_BASE, ctxt->fs_base); |
| 47 | rdmsrl(MSR_GS_BASE, ctxt->gs_base); |
| 48 | rdmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base); |
| 49 | |
| 50 | /* |
| 51 | * control registers |
| 52 | */ |
| 53 | asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0)); |
| 54 | asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2)); |
| 55 | asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3)); |
| 56 | asm volatile ("movq %%cr4, %0" : "=r" (ctxt->cr4)); |
Pavel Machek | 8d783b3 | 2005-06-25 14:55:14 -0700 | [diff] [blame] | 57 | asm volatile ("movq %%cr8, %0" : "=r" (ctxt->cr8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | void save_processor_state(void) |
| 61 | { |
| 62 | __save_processor_state(&saved_context); |
| 63 | } |
| 64 | |
Shaohua Li | 08967f9 | 2005-10-30 14:59:28 -0800 | [diff] [blame] | 65 | static void do_fpu_end(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
Shaohua Li | 08967f9 | 2005-10-30 14:59:28 -0800 | [diff] [blame] | 67 | /* |
| 68 | * Restore FPU regs if necessary |
| 69 | */ |
| 70 | kernel_fpu_end(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | void __restore_processor_state(struct saved_context *ctxt) |
| 74 | { |
| 75 | /* |
| 76 | * control registers |
| 77 | */ |
Pavel Machek | 8d783b3 | 2005-06-25 14:55:14 -0700 | [diff] [blame] | 78 | asm volatile ("movq %0, %%cr8" :: "r" (ctxt->cr8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4)); |
| 80 | asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3)); |
| 81 | asm volatile ("movq %0, %%cr2" :: "r" (ctxt->cr2)); |
| 82 | asm volatile ("movq %0, %%cr0" :: "r" (ctxt->cr0)); |
| 83 | |
| 84 | /* |
Pavel Machek | 8d783b3 | 2005-06-25 14:55:14 -0700 | [diff] [blame] | 85 | * now restore the descriptor tables to their proper values |
| 86 | * ltr is done i fix_processor_context(). |
| 87 | */ |
| 88 | asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit)); |
| 89 | asm volatile ("lidt %0" :: "m" (ctxt->idt_limit)); |
| 90 | |
| 91 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | * segment registers |
| 93 | */ |
| 94 | asm volatile ("movw %0, %%ds" :: "r" (ctxt->ds)); |
| 95 | asm volatile ("movw %0, %%es" :: "r" (ctxt->es)); |
| 96 | asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs)); |
| 97 | load_gs_index(ctxt->gs); |
| 98 | asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss)); |
| 99 | |
| 100 | wrmsrl(MSR_FS_BASE, ctxt->fs_base); |
| 101 | wrmsrl(MSR_GS_BASE, ctxt->gs_base); |
| 102 | wrmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base); |
| 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | fix_processor_context(); |
| 105 | |
| 106 | do_fpu_end(); |
Shaohua Li | 3b520b2 | 2005-07-07 17:56:38 -0700 | [diff] [blame] | 107 | mtrr_ap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | void restore_processor_state(void) |
| 111 | { |
| 112 | __restore_processor_state(&saved_context); |
| 113 | } |
| 114 | |
| 115 | void fix_processor_context(void) |
| 116 | { |
| 117 | int cpu = smp_processor_id(); |
| 118 | struct tss_struct *t = &per_cpu(init_tss, cpu); |
| 119 | |
| 120 | set_tss_desc(cpu,t); /* This just modifies memory; should not be neccessary. But... This is neccessary, because 386 hardware has concept of busy TSS or some similar stupidity. */ |
| 121 | |
Ravikiran G Thirumalai | c11efdf | 2006-01-11 22:43:57 +0100 | [diff] [blame] | 122 | cpu_gdt(cpu)[GDT_ENTRY_TSS].type = 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | syscall_init(); /* This sets MSR_*STAR and related */ |
| 125 | load_TR_desc(); /* This does ltr */ |
| 126 | load_LDT(¤t->active_mm->context); /* This does lldt */ |
| 127 | |
| 128 | /* |
| 129 | * Now maybe reload the debug registers |
| 130 | */ |
| 131 | if (current->thread.debugreg7){ |
| 132 | loaddebug(¤t->thread, 0); |
| 133 | loaddebug(¤t->thread, 1); |
| 134 | loaddebug(¤t->thread, 2); |
| 135 | loaddebug(¤t->thread, 3); |
| 136 | /* no 4 and 5 */ |
| 137 | loaddebug(¤t->thread, 6); |
| 138 | loaddebug(¤t->thread, 7); |
| 139 | } |
| 140 | |
| 141 | } |
| 142 | |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 143 | #ifdef CONFIG_SOFTWARE_SUSPEND |
| 144 | /* Defined in arch/x86_64/kernel/suspend_asm.S */ |
| 145 | extern int restore_image(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 147 | pgd_t *temp_level4_pgt; |
| 148 | |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 149 | static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 150 | { |
| 151 | long i, j; |
| 152 | |
| 153 | i = pud_index(address); |
| 154 | pud = pud + i; |
| 155 | for (; i < PTRS_PER_PUD; pud++, i++) { |
| 156 | unsigned long paddr; |
| 157 | pmd_t *pmd; |
| 158 | |
| 159 | paddr = address + i*PUD_SIZE; |
| 160 | if (paddr >= end) |
| 161 | break; |
| 162 | |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 163 | pmd = (pmd_t *)get_safe_page(GFP_ATOMIC); |
| 164 | if (!pmd) |
| 165 | return -ENOMEM; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 166 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); |
| 167 | for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) { |
| 168 | unsigned long pe; |
| 169 | |
| 170 | if (paddr >= end) |
| 171 | break; |
| 172 | pe = _PAGE_NX | _PAGE_PSE | _KERNPG_TABLE | paddr; |
| 173 | pe &= __supported_pte_mask; |
| 174 | set_pmd(pmd, __pmd(pe)); |
| 175 | } |
| 176 | } |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 177 | return 0; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 178 | } |
| 179 | |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 180 | static int set_up_temporary_mappings(void) |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 181 | { |
| 182 | unsigned long start, end, next; |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 183 | int error; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 184 | |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 185 | temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC); |
| 186 | if (!temp_level4_pgt) |
| 187 | return -ENOMEM; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 188 | |
| 189 | /* It is safe to reuse the original kernel mapping */ |
| 190 | set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map), |
| 191 | init_level4_pgt[pgd_index(__START_KERNEL_map)]); |
| 192 | |
| 193 | /* Set up the direct mapping from scratch */ |
| 194 | start = (unsigned long)pfn_to_kaddr(0); |
| 195 | end = (unsigned long)pfn_to_kaddr(end_pfn); |
| 196 | |
| 197 | for (; start < end; start = next) { |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 198 | pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC); |
| 199 | if (!pud) |
| 200 | return -ENOMEM; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 201 | next = start + PGDIR_SIZE; |
| 202 | if (next > end) |
| 203 | next = end; |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 204 | if ((error = res_phys_pud_init(pud, __pa(start), __pa(next)))) |
| 205 | return error; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 206 | set_pgd(temp_level4_pgt + pgd_index(start), |
| 207 | mk_kernel_pgd(__pa(pud))); |
| 208 | } |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 209 | return 0; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | int swsusp_arch_resume(void) |
| 213 | { |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 214 | int error; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 215 | |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 216 | /* We have got enough memory and from now on we cannot recover */ |
Rafael J. Wysocki | 2c1b4a5 | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 217 | if ((error = set_up_temporary_mappings())) |
| 218 | return error; |
Rafael J. Wysocki | 3dd0832 | 2005-10-09 21:19:40 +0200 | [diff] [blame] | 219 | restore_image(); |
| 220 | return 0; |
| 221 | } |
| 222 | #endif /* CONFIG_SOFTWARE_SUSPEND */ |