1 #ifndef _ASM_X86_PGTABLE_64_H 2 #define _ASM_X86_PGTABLE_64_H 3 4 #include <linux/const.h> 5 #include <asm/pgtable_64_types.h> 6 7 #ifndef __ASSEMBLY__ 8 9 /* 10 * This file contains the functions and defines necessary to modify and use 11 * the x86-64 page table tree. 12 */ 13 #include <asm/processor.h> 14 #include <linux/bitops.h> 15 #include <linux/threads.h> 16 17 extern pud_t level3_kernel_pgt[512]; 18 extern pud_t level3_ident_pgt[512]; 19 extern pmd_t level2_kernel_pgt[512]; 20 extern pmd_t level2_fixmap_pgt[512]; 21 extern pmd_t level2_ident_pgt[512]; 22 extern pgd_t init_level4_pgt[]; 23 24 #define swapper_pg_dir init_level4_pgt 25 26 extern void paging_init(void); 27 28 #define pte_ERROR(e) \ 29 pr_err("%s:%d: bad pte %p(%016lx)\n", \ 30 __FILE__, __LINE__, &(e), pte_val(e)) 31 #define pmd_ERROR(e) \ 32 pr_err("%s:%d: bad pmd %p(%016lx)\n", \ 33 __FILE__, __LINE__, &(e), pmd_val(e)) 34 #define pud_ERROR(e) \ 35 pr_err("%s:%d: bad pud %p(%016lx)\n", \ 36 __FILE__, __LINE__, &(e), pud_val(e)) 37 #define pgd_ERROR(e) \ 38 pr_err("%s:%d: bad pgd %p(%016lx)\n", \ 39 __FILE__, __LINE__, &(e), pgd_val(e)) 40 41 struct mm_struct; 42 43 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte); 44 45 46 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, 47 pte_t *ptep) 48 { 49 *ptep = native_make_pte(0); 50 } 51 52 static inline void native_set_pte(pte_t *ptep, pte_t pte) 53 { 54 *ptep = pte; 55 } 56 57 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) 58 { 59 native_set_pte(ptep, pte); 60 } 61 62 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) 63 { 64 *pmdp = pmd; 65 } 66 67 static inline void native_pmd_clear(pmd_t *pmd) 68 { 69 native_set_pmd(pmd, native_make_pmd(0)); 70 } 71 72 static inline pte_t native_ptep_get_and_clear(pte_t *xp) 73 { 74 #ifdef CONFIG_SMP 75 return native_make_pte(xchg(&xp->pte, 0)); 76 #else 77 /* native_local_ptep_get_and_clear, 78 but duplicated because of cyclic dependency */ 79 pte_t ret = *xp; 80 native_pte_clear(NULL, 0, xp); 81 return ret; 82 #endif 83 } 84 85 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) 86 { 87 #ifdef CONFIG_SMP 88 return native_make_pmd(xchg(&xp->pmd, 0)); 89 #else 90 /* native_local_pmdp_get_and_clear, 91 but duplicated because of cyclic dependency */ 92 pmd_t ret = *xp; 93 native_pmd_clear(xp); 94 return ret; 95 #endif 96 } 97 98 static inline void native_set_pud(pud_t *pudp, pud_t pud) 99 { 100 *pudp = pud; 101 } 102 103 static inline void native_pud_clear(pud_t *pud) 104 { 105 native_set_pud(pud, native_make_pud(0)); 106 } 107 108 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd) 109 { 110 *pgdp = pgd; 111 } 112 113 static inline void native_pgd_clear(pgd_t *pgd) 114 { 115 native_set_pgd(pgd, native_make_pgd(0)); 116 } 117 118 extern void sync_global_pgds(unsigned long start, unsigned long end); 119 120 /* 121 * Conversion functions: convert a page and protection to a page entry, 122 * and a page entry and page directory to the page they refer to. 123 */ 124 125 /* 126 * Level 4 access. 127 */ 128 static inline int pgd_large(pgd_t pgd) { return 0; } 129 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE) 130 131 /* PUD - Level3 access */ 132 133 /* PMD - Level 2 access */ 134 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT) 135 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \ 136 _PAGE_FILE }) 137 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT 138 139 /* PTE - Level 1 access. */ 140 141 /* x86-64 always has all page tables mapped. */ 142 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address)) 143 #define pte_unmap(pte) ((void)(pte))/* NOP */ 144 145 #define update_mmu_cache(vma, address, ptep) do { } while (0) 146 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) 147 148 /* Encode and de-code a swap entry */ 149 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE 150 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1) 151 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) 152 #else 153 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1) 154 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1) 155 #endif 156 157 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) 158 159 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ 160 & ((1U << SWP_TYPE_BITS) - 1)) 161 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) 162 #define __swp_entry(type, offset) ((swp_entry_t) { \ 163 ((type) << (_PAGE_BIT_PRESENT + 1)) \ 164 | ((offset) << SWP_OFFSET_SHIFT) }) 165 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) 166 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) 167 168 extern int kern_addr_valid(unsigned long addr); 169 extern void cleanup_highmap(void); 170 171 #define HAVE_ARCH_UNMAPPED_AREA 172 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 173 174 #define pgtable_cache_init() do { } while (0) 175 #define check_pgt_cache() do { } while (0) 176 177 #define PAGE_AGP PAGE_KERNEL_NOCACHE 178 #define HAVE_PAGE_AGP 1 179 180 /* fs/proc/kcore.c */ 181 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK) 182 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK) 183 184 #define __HAVE_ARCH_PTE_SAME 185 186 #endif /* !__ASSEMBLY__ */ 187 188 #endif /* _ASM_X86_PGTABLE_64_H */ 189