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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | /* * Hibernation support for x86-64 * * Distribute under GPLv2 * * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl> * Copyright (c) 2002 Pavel Machek <pavel@suse.cz> * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org> */ #include <linux/smp.h> #include <linux/suspend.h> #include <asm/proto.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/mtrr.h> #include <asm/suspend.h> /* References to section boundaries */ extern const void __nosave_begin, __nosave_end; /* Defined in hibernate_asm_64.S */ extern int restore_image(void); /* * Address to jump to in the last phase of restore in order to get to the image * kernel's text (this value is passed in the image header). */ unsigned long restore_jump_address; /* * Value of the cr3 register from before the hibernation (this value is passed * in the image header). */ unsigned long restore_cr3; pgd_t *temp_level4_pgt; void *relocated_restore_code; static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) { long i, j; i = pud_index(address); pud = pud + i; for (; i < PTRS_PER_PUD; pud++, i++) { unsigned long paddr; pmd_t *pmd; paddr = address + i*PUD_SIZE; if (paddr >= end) break; pmd = (pmd_t *)get_safe_page(GFP_ATOMIC); if (!pmd) return -ENOMEM; set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) { unsigned long pe; if (paddr >= end) break; pe = __PAGE_KERNEL_LARGE_EXEC | paddr; pe &= __supported_pte_mask; set_pmd(pmd, __pmd(pe)); } } return 0; } static int set_up_temporary_mappings(void) { unsigned long start, end, next; int error; temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC); if (!temp_level4_pgt) return -ENOMEM; /* It is safe to reuse the original kernel mapping */ set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map), init_level4_pgt[pgd_index(__START_KERNEL_map)]); /* Set up the direct mapping from scratch */ start = (unsigned long)pfn_to_kaddr(0); end = (unsigned long)pfn_to_kaddr(max_pfn); for (; start < end; start = next) { pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC); if (!pud) return -ENOMEM; next = start + PGDIR_SIZE; if (next > end) next = end; if ((error = res_phys_pud_init(pud, __pa(start), __pa(next)))) return error; set_pgd(temp_level4_pgt + pgd_index(start), mk_kernel_pgd(__pa(pud))); } return 0; } int swsusp_arch_resume(void) { int error; /* We have got enough memory and from now on we cannot recover */ if ((error = set_up_temporary_mappings())) return error; relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC); if (!relocated_restore_code) return -ENOMEM; memcpy(relocated_restore_code, &core_restore_code, &restore_registers - &core_restore_code); restore_image(); return 0; } /* * pfn_is_nosave - check if given pfn is in the 'nosave' section */ int pfn_is_nosave(unsigned long pfn) { unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT; unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT; return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn); } struct restore_data_record { unsigned long jump_address; unsigned long cr3; unsigned long magic; }; #define RESTORE_MAGIC 0x0123456789ABCDEFUL /** * arch_hibernation_header_save - populate the architecture specific part * of a hibernation image header * @addr: address to save the data at */ int arch_hibernation_header_save(void *addr, unsigned int max_size) { struct restore_data_record *rdr = addr; if (max_size < sizeof(struct restore_data_record)) return -EOVERFLOW; rdr->jump_address = restore_jump_address; rdr->cr3 = restore_cr3; rdr->magic = RESTORE_MAGIC; return 0; } /** * arch_hibernation_header_restore - read the architecture specific data * from the hibernation image header * @addr: address to read the data from */ int arch_hibernation_header_restore(void *addr) { struct restore_data_record *rdr = addr; restore_jump_address = rdr->jump_address; restore_cr3 = rdr->cr3; return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL; } |