1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
4 #include <linux/const.h>
8 * This file contains the functions and defines necessary to modify and use
9 * the x86-64 page table tree.
11 #include <asm/processor.h>
12 #include <linux/bitops.h>
13 #include <linux/threads.h>
16 extern pud_t level3_kernel_pgt[512];
17 extern pud_t level3_ident_pgt[512];
18 extern pmd_t level2_kernel_pgt[512];
19 extern pmd_t level2_fixmap_pgt[512];
20 extern pmd_t level2_ident_pgt[512];
21 extern pgd_t init_level4_pgt[];
23 #define swapper_pg_dir init_level4_pgt
25 extern void paging_init(void);
27 #endif /* !__ASSEMBLY__ */
29 #define SHARED_KERNEL_PMD 0
32 * PGDIR_SHIFT determines what a top-level page table entry can map
34 #define PGDIR_SHIFT 39
35 #define PTRS_PER_PGD 512
41 #define PTRS_PER_PUD 512
44 * PMD_SHIFT determines the size of the area a middle-level
48 #define PTRS_PER_PMD 512
51 * entries per page directory level
53 #define PTRS_PER_PTE 512
57 #define pte_ERROR(e) \
58 printk("%s:%d: bad pte %p(%016lx).\n", \
59 __FILE__, __LINE__, &(e), pte_val(e))
60 #define pmd_ERROR(e) \
61 printk("%s:%d: bad pmd %p(%016lx).\n", \
62 __FILE__, __LINE__, &(e), pmd_val(e))
63 #define pud_ERROR(e) \
64 printk("%s:%d: bad pud %p(%016lx).\n", \
65 __FILE__, __LINE__, &(e), pud_val(e))
66 #define pgd_ERROR(e) \
67 printk("%s:%d: bad pgd %p(%016lx).\n", \
68 __FILE__, __LINE__, &(e), pgd_val(e))
72 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
75 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
78 *ptep = native_make_pte(0);
81 static inline void native_set_pte(pte_t *ptep, pte_t pte)
86 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
88 native_set_pte(ptep, pte);
91 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
94 return native_make_pte(xchg(&xp->pte, 0));
96 /* native_local_ptep_get_and_clear,
97 but duplicated because of cyclic dependency */
99 native_pte_clear(NULL, 0, xp);
104 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
109 static inline void native_pmd_clear(pmd_t *pmd)
111 native_set_pmd(pmd, native_make_pmd(0));
114 static inline void native_set_pud(pud_t *pudp, pud_t pud)
119 static inline void native_pud_clear(pud_t *pud)
121 native_set_pud(pud, native_make_pud(0));
124 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
129 static inline void native_pgd_clear(pgd_t *pgd)
131 native_set_pgd(pgd, native_make_pgd(0));
134 #endif /* !__ASSEMBLY__ */
136 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
137 #define PMD_MASK (~(PMD_SIZE - 1))
138 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
139 #define PUD_MASK (~(PUD_SIZE - 1))
140 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
141 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
144 #define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
145 #define VMALLOC_START _AC(0xffffc20000000000, UL)
146 #define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
147 #define VMEMMAP_START _AC(0xffffe20000000000, UL)
148 #define MODULES_VADDR _AC(0xffffffffa0000000, UL)
149 #define MODULES_END _AC(0xffffffffff000000, UL)
150 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
155 * Conversion functions: convert a page and protection to a page entry,
156 * and a page entry and page directory to the page they refer to.
162 static inline int pgd_large(pgd_t pgd) { return 0; }
163 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
165 /* PUD - Level3 access */
167 /* PMD - Level 2 access */
168 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
169 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
171 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
173 /* PTE - Level 1 access. */
175 /* x86-64 always has all page tables mapped. */
176 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
177 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
178 #define pte_unmap(pte) /* NOP */
179 #define pte_unmap_nested(pte) /* NOP */
181 #define update_mmu_cache(vma, address, pte) do { } while (0)
183 extern int direct_gbpages;
185 /* Encode and de-code a swap entry */
186 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
187 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
188 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
190 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
191 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
194 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
196 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
197 & ((1U << SWP_TYPE_BITS) - 1))
198 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
199 #define __swp_entry(type, offset) ((swp_entry_t) { \
200 ((type) << (_PAGE_BIT_PRESENT + 1)) \
201 | ((offset) << SWP_OFFSET_SHIFT) })
202 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
203 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
205 extern int kern_addr_valid(unsigned long addr);
206 extern void cleanup_highmap(void);
208 #define HAVE_ARCH_UNMAPPED_AREA
209 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
211 #define pgtable_cache_init() do { } while (0)
212 #define check_pgt_cache() do { } while (0)
214 #define PAGE_AGP PAGE_KERNEL_NOCACHE
215 #define HAVE_PAGE_AGP 1
217 /* fs/proc/kcore.c */
218 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
219 #define kc_offset_to_vaddr(o) \
220 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1))) \
221 ? ((o) | ~__VIRTUAL_MASK) \
224 #define __HAVE_ARCH_PTE_SAME
225 #endif /* !__ASSEMBLY__ */
227 #endif /* _ASM_X86_PGTABLE_64_H */