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>
15 extern pud_t level3_kernel_pgt[512];
16 extern pud_t level3_ident_pgt[512];
17 extern pmd_t level2_kernel_pgt[512];
18 extern pmd_t level2_fixmap_pgt[512];
19 extern pmd_t level2_ident_pgt[512];
20 extern pgd_t init_level4_pgt[];
22 #define swapper_pg_dir init_level4_pgt
24 extern void paging_init(void);
26 #endif /* !__ASSEMBLY__ */
28 #define SHARED_KERNEL_PMD 0
31 * PGDIR_SHIFT determines what a top-level page table entry can map
33 #define PGDIR_SHIFT 39
34 #define PTRS_PER_PGD 512
40 #define PTRS_PER_PUD 512
43 * PMD_SHIFT determines the size of the area a middle-level
47 #define PTRS_PER_PMD 512
50 * entries per page directory level
52 #define PTRS_PER_PTE 512
56 #define pte_ERROR(e) \
57 printk("%s:%d: bad pte %p(%016lx).\n", \
58 __FILE__, __LINE__, &(e), pte_val(e))
59 #define pmd_ERROR(e) \
60 printk("%s:%d: bad pmd %p(%016lx).\n", \
61 __FILE__, __LINE__, &(e), pmd_val(e))
62 #define pud_ERROR(e) \
63 printk("%s:%d: bad pud %p(%016lx).\n", \
64 __FILE__, __LINE__, &(e), pud_val(e))
65 #define pgd_ERROR(e) \
66 printk("%s:%d: bad pgd %p(%016lx).\n", \
67 __FILE__, __LINE__, &(e), pgd_val(e))
69 #define pgd_none(x) (!pgd_val(x))
70 #define pud_none(x) (!pud_val(x))
74 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
77 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
80 *ptep = native_make_pte(0);
83 static inline void native_set_pte(pte_t *ptep, pte_t pte)
88 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
90 native_set_pte(ptep, pte);
93 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
96 return native_make_pte(xchg(&xp->pte, 0));
98 /* native_local_ptep_get_and_clear,
99 but duplicated because of cyclic dependency */
101 native_pte_clear(NULL, 0, xp);
106 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
111 static inline void native_pmd_clear(pmd_t *pmd)
113 native_set_pmd(pmd, native_make_pmd(0));
116 static inline void native_set_pud(pud_t *pudp, pud_t pud)
121 static inline void native_pud_clear(pud_t *pud)
123 native_set_pud(pud, native_make_pud(0));
126 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
131 static inline void native_pgd_clear(pgd_t *pgd)
133 native_set_pgd(pgd, native_make_pgd(0));
136 #define pte_same(a, b) ((a).pte == (b).pte)
138 #endif /* !__ASSEMBLY__ */
140 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
141 #define PMD_MASK (~(PMD_SIZE - 1))
142 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
143 #define PUD_MASK (~(PUD_SIZE - 1))
144 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
145 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
148 #define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
149 #define VMALLOC_START _AC(0xffffc20000000000, UL)
150 #define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
151 #define VMEMMAP_START _AC(0xffffe20000000000, UL)
152 #define MODULES_VADDR _AC(0xffffffffa0000000, UL)
153 #define MODULES_END _AC(0xffffffffff000000, UL)
154 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
158 static inline int pgd_bad(pgd_t pgd)
160 return (pgd_val(pgd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
163 static inline int pud_bad(pud_t pud)
165 return (pud_val(pud) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
168 static inline int pmd_bad(pmd_t pmd)
170 return (pmd_val(pmd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
173 #define pte_none(x) (!pte_val((x)))
174 #define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
176 #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) /* FIXME: is this right? */
179 * Conversion functions: convert a page and protection to a page entry,
180 * and a page entry and page directory to the page they refer to.
186 #define pgd_page_vaddr(pgd) \
187 ((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_PFN_MASK))
188 #define pgd_page(pgd) (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
189 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
190 static inline int pgd_large(pgd_t pgd) { return 0; }
191 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
193 /* PUD - Level3 access */
194 /* to find an entry in a page-table-directory. */
195 #define pud_page_vaddr(pud) \
196 ((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
197 #define pud_page(pud) (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
198 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
199 #define pud_offset(pgd, address) \
200 ((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
201 #define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
203 static inline int pud_large(pud_t pte)
205 return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
206 (_PAGE_PSE | _PAGE_PRESENT);
209 /* PMD - Level 2 access */
210 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_PFN_MASK))
211 #define pmd_page(pmd) (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
213 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
214 #define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
216 #define pmd_none(x) (!pmd_val((x)))
217 #define pmd_present(x) (pmd_val((x)) & _PAGE_PRESENT)
218 #define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
219 #define pmd_pfn(x) ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
221 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
222 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
224 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
226 /* PTE - Level 1 access. */
228 /* page, protection -> pte */
229 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn((page)), (pgprot))
231 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
232 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
233 pte_index((address)))
235 /* x86-64 always has all page tables mapped. */
236 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
237 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
238 #define pte_unmap(pte) /* NOP */
239 #define pte_unmap_nested(pte) /* NOP */
241 #define update_mmu_cache(vma, address, pte) do { } while (0)
243 extern int direct_gbpages;
245 /* Encode and de-code a swap entry */
246 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
247 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
248 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
250 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
251 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
254 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
256 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
257 & ((1U << SWP_TYPE_BITS) - 1))
258 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
259 #define __swp_entry(type, offset) ((swp_entry_t) { \
260 ((type) << (_PAGE_BIT_PRESENT + 1)) \
261 | ((offset) << SWP_OFFSET_SHIFT) })
262 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
263 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
265 extern int kern_addr_valid(unsigned long addr);
266 extern void cleanup_highmap(void);
268 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
269 remap_pfn_range(vma, vaddr, pfn, size, prot)
271 #define HAVE_ARCH_UNMAPPED_AREA
272 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
274 #define pgtable_cache_init() do { } while (0)
275 #define check_pgt_cache() do { } while (0)
277 #define PAGE_AGP PAGE_KERNEL_NOCACHE
278 #define HAVE_PAGE_AGP 1
280 /* fs/proc/kcore.c */
281 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
282 #define kc_offset_to_vaddr(o) \
283 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1))) \
284 ? ((o) | ~__VIRTUAL_MASK) \
287 #define __HAVE_ARCH_PTE_SAME
288 #endif /* !__ASSEMBLY__ */
290 #endif /* _ASM_X86_PGTABLE_64_H */