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Linux/arch/x86/power/hibernate_32.c

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  1 /*
  2  * Hibernation support specific for i386 - temporary page tables
  3  *
  4  * Distribute under GPLv2
  5  *
  6  * Copyright (c) 2006 Rafael J. Wysocki <rjw@sisk.pl>
  7  */
  8 
  9 #include <linux/gfp.h>
 10 #include <linux/suspend.h>
 11 #include <linux/bootmem.h>
 12 
 13 #include <asm/page.h>
 14 #include <asm/pgtable.h>
 15 #include <asm/mmzone.h>
 16 #include <asm/sections.h>
 17 
 18 /* Defined in hibernate_asm_32.S */
 19 extern int restore_image(void);
 20 
 21 /* Pointer to the temporary resume page tables */
 22 pgd_t *resume_pg_dir;
 23 
 24 /* The following three functions are based on the analogous code in
 25  * arch/x86/mm/init_32.c
 26  */
 27 
 28 /*
 29  * Create a middle page table on a resume-safe page and put a pointer to it in
 30  * the given global directory entry.  This only returns the gd entry
 31  * in non-PAE compilation mode, since the middle layer is folded.
 32  */
 33 static pmd_t *resume_one_md_table_init(pgd_t *pgd)
 34 {
 35         pud_t *pud;
 36         pmd_t *pmd_table;
 37 
 38 #ifdef CONFIG_X86_PAE
 39         pmd_table = (pmd_t *)get_safe_page(GFP_ATOMIC);
 40         if (!pmd_table)
 41                 return NULL;
 42 
 43         set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
 44         pud = pud_offset(pgd, 0);
 45 
 46         BUG_ON(pmd_table != pmd_offset(pud, 0));
 47 #else
 48         pud = pud_offset(pgd, 0);
 49         pmd_table = pmd_offset(pud, 0);
 50 #endif
 51 
 52         return pmd_table;
 53 }
 54 
 55 /*
 56  * Create a page table on a resume-safe page and place a pointer to it in
 57  * a middle page directory entry.
 58  */
 59 static pte_t *resume_one_page_table_init(pmd_t *pmd)
 60 {
 61         if (pmd_none(*pmd)) {
 62                 pte_t *page_table = (pte_t *)get_safe_page(GFP_ATOMIC);
 63                 if (!page_table)
 64                         return NULL;
 65 
 66                 set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
 67 
 68                 BUG_ON(page_table != pte_offset_kernel(pmd, 0));
 69 
 70                 return page_table;
 71         }
 72 
 73         return pte_offset_kernel(pmd, 0);
 74 }
 75 
 76 /*
 77  * This maps the physical memory to kernel virtual address space, a total
 78  * of max_low_pfn pages, by creating page tables starting from address
 79  * PAGE_OFFSET.  The page tables are allocated out of resume-safe pages.
 80  */
 81 static int resume_physical_mapping_init(pgd_t *pgd_base)
 82 {
 83         unsigned long pfn;
 84         pgd_t *pgd;
 85         pmd_t *pmd;
 86         pte_t *pte;
 87         int pgd_idx, pmd_idx;
 88 
 89         pgd_idx = pgd_index(PAGE_OFFSET);
 90         pgd = pgd_base + pgd_idx;
 91         pfn = 0;
 92 
 93         for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
 94                 pmd = resume_one_md_table_init(pgd);
 95                 if (!pmd)
 96                         return -ENOMEM;
 97 
 98                 if (pfn >= max_low_pfn)
 99                         continue;
100 
101                 for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD; pmd++, pmd_idx++) {
102                         if (pfn >= max_low_pfn)
103                                 break;
104 
105                         /* Map with big pages if possible, otherwise create
106                          * normal page tables.
107                          * NOTE: We can mark everything as executable here
108                          */
109                         if (boot_cpu_has(X86_FEATURE_PSE)) {
110                                 set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC));
111                                 pfn += PTRS_PER_PTE;
112                         } else {
113                                 pte_t *max_pte;
114 
115                                 pte = resume_one_page_table_init(pmd);
116                                 if (!pte)
117                                         return -ENOMEM;
118 
119                                 max_pte = pte + PTRS_PER_PTE;
120                                 for (; pte < max_pte; pte++, pfn++) {
121                                         if (pfn >= max_low_pfn)
122                                                 break;
123 
124                                         set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
125                                 }
126                         }
127                 }
128         }
129 
130         return 0;
131 }
132 
133 static inline void resume_init_first_level_page_table(pgd_t *pg_dir)
134 {
135 #ifdef CONFIG_X86_PAE
136         int i;
137 
138         /* Init entries of the first-level page table to the zero page */
139         for (i = 0; i < PTRS_PER_PGD; i++)
140                 set_pgd(pg_dir + i,
141                         __pgd(__pa(empty_zero_page) | _PAGE_PRESENT));
142 #endif
143 }
144 
145 int swsusp_arch_resume(void)
146 {
147         int error;
148 
149         resume_pg_dir = (pgd_t *)get_safe_page(GFP_ATOMIC);
150         if (!resume_pg_dir)
151                 return -ENOMEM;
152 
153         resume_init_first_level_page_table(resume_pg_dir);
154         error = resume_physical_mapping_init(resume_pg_dir);
155         if (error)
156                 return error;
157 
158         /* We have got enough memory and from now on we cannot recover */
159         restore_image();
160         return 0;
161 }
162 
163 /*
164  *      pfn_is_nosave - check if given pfn is in the 'nosave' section
165  */
166 
167 int pfn_is_nosave(unsigned long pfn)
168 {
169         unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
170         unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
171         return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
172 }
173 

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