1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
6 #include <asm/pgtable_types.h>
9 * Macro to mark a page protection value as UC-
11 #define pgprot_noncached(prot) \
12 ((boot_cpu_data.x86 > 3) \
13 ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \
19 * ZERO_PAGE is a global shared page that is always zero: used
20 * for zero-mapped memory areas etc..
22 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
23 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
25 extern spinlock_t pgd_lock;
26 extern struct list_head pgd_list;
29 * The following only work if pte_present() is true.
30 * Undefined behaviour if not..
32 static inline int pte_dirty(pte_t pte)
34 return pte_flags(pte) & _PAGE_DIRTY;
37 static inline int pte_young(pte_t pte)
39 return pte_flags(pte) & _PAGE_ACCESSED;
42 static inline int pte_write(pte_t pte)
44 return pte_flags(pte) & _PAGE_RW;
47 static inline int pte_file(pte_t pte)
49 return pte_flags(pte) & _PAGE_FILE;
52 static inline int pte_huge(pte_t pte)
54 return pte_flags(pte) & _PAGE_PSE;
57 static inline int pte_global(pte_t pte)
59 return pte_flags(pte) & _PAGE_GLOBAL;
62 static inline int pte_exec(pte_t pte)
64 return !(pte_flags(pte) & _PAGE_NX);
67 static inline int pte_special(pte_t pte)
69 return pte_flags(pte) & _PAGE_SPECIAL;
72 static inline unsigned long pte_pfn(pte_t pte)
74 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
77 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
79 static inline int pmd_large(pmd_t pte)
81 return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
82 (_PAGE_PSE | _PAGE_PRESENT);
85 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
87 pteval_t v = native_pte_val(pte);
89 return native_make_pte(v | set);
92 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
94 pteval_t v = native_pte_val(pte);
96 return native_make_pte(v & ~clear);
99 static inline pte_t pte_mkclean(pte_t pte)
101 return pte_clear_flags(pte, _PAGE_DIRTY);
104 static inline pte_t pte_mkold(pte_t pte)
106 return pte_clear_flags(pte, _PAGE_ACCESSED);
109 static inline pte_t pte_wrprotect(pte_t pte)
111 return pte_clear_flags(pte, _PAGE_RW);
114 static inline pte_t pte_mkexec(pte_t pte)
116 return pte_clear_flags(pte, _PAGE_NX);
119 static inline pte_t pte_mkdirty(pte_t pte)
121 return pte_set_flags(pte, _PAGE_DIRTY);
124 static inline pte_t pte_mkyoung(pte_t pte)
126 return pte_set_flags(pte, _PAGE_ACCESSED);
129 static inline pte_t pte_mkwrite(pte_t pte)
131 return pte_set_flags(pte, _PAGE_RW);
134 static inline pte_t pte_mkhuge(pte_t pte)
136 return pte_set_flags(pte, _PAGE_PSE);
139 static inline pte_t pte_clrhuge(pte_t pte)
141 return pte_clear_flags(pte, _PAGE_PSE);
144 static inline pte_t pte_mkglobal(pte_t pte)
146 return pte_set_flags(pte, _PAGE_GLOBAL);
149 static inline pte_t pte_clrglobal(pte_t pte)
151 return pte_clear_flags(pte, _PAGE_GLOBAL);
154 static inline pte_t pte_mkspecial(pte_t pte)
156 return pte_set_flags(pte, _PAGE_SPECIAL);
159 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
161 return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
162 pgprot_val(pgprot)) & __supported_pte_mask);
165 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
167 return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
168 pgprot_val(pgprot)) & __supported_pte_mask);
171 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
173 pteval_t val = pte_val(pte);
176 * Chop off the NX bit (if present), and add the NX portion of
177 * the newprot (if present):
179 val &= _PAGE_CHG_MASK;
180 val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
185 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
186 #define pgprot_modify pgprot_modify
187 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
189 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
190 pgprotval_t addbits = pgprot_val(newprot);
191 return __pgprot(preservebits | addbits);
194 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
196 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
198 static inline int is_new_memtype_allowed(unsigned long flags,
199 unsigned long new_flags)
202 * Certain new memtypes are not allowed with certain
204 * - request is uncached, return cannot be write-back
205 * - request is write-combine, return cannot be write-back
207 if ((flags == _PAGE_CACHE_UC_MINUS &&
208 new_flags == _PAGE_CACHE_WB) ||
209 (flags == _PAGE_CACHE_WC &&
210 new_flags == _PAGE_CACHE_WB)) {
217 #ifdef CONFIG_PARAVIRT
218 #include <asm/paravirt.h>
219 #else /* !CONFIG_PARAVIRT */
220 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
221 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
223 #define set_pte_present(mm, addr, ptep, pte) \
224 native_set_pte_present(mm, addr, ptep, pte)
225 #define set_pte_atomic(ptep, pte) \
226 native_set_pte_atomic(ptep, pte)
228 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
230 #ifndef __PAGETABLE_PUD_FOLDED
231 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
232 #define pgd_clear(pgd) native_pgd_clear(pgd)
236 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
239 #ifndef __PAGETABLE_PMD_FOLDED
240 #define pud_clear(pud) native_pud_clear(pud)
243 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
244 #define pmd_clear(pmd) native_pmd_clear(pmd)
246 #define pte_update(mm, addr, ptep) do { } while (0)
247 #define pte_update_defer(mm, addr, ptep) do { } while (0)
249 static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
251 native_pagetable_setup_start(base);
254 static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
256 native_pagetable_setup_done(base);
258 #endif /* CONFIG_PARAVIRT */
260 #endif /* __ASSEMBLY__ */
263 # include "pgtable_32.h"
265 # include "pgtable_64.h"
269 #include <linux/mm_types.h>
271 static inline int pte_none(pte_t pte)
276 #define __HAVE_ARCH_PTE_SAME
277 static inline int pte_same(pte_t a, pte_t b)
279 return a.pte == b.pte;
282 static inline int pte_present(pte_t a)
284 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
287 static inline int pmd_present(pmd_t pmd)
289 return pmd_flags(pmd) & _PAGE_PRESENT;
292 static inline int pmd_none(pmd_t pmd)
294 /* Only check low word on 32-bit platforms, since it might be
295 out of sync with upper half. */
296 return (unsigned long)native_pmd_val(pmd) == 0;
299 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
301 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
305 * Currently stuck as a macro due to indirect forward reference to
306 * linux/mmzone.h's __section_mem_map_addr() definition:
308 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
311 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
313 * this macro returns the index of the entry in the pmd page which would
314 * control the given virtual address
316 static inline unsigned pmd_index(unsigned long address)
318 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
322 * Conversion functions: convert a page and protection to a page entry,
323 * and a page entry and page directory to the page they refer to.
325 * (Currently stuck as a macro because of indirect forward reference
326 * to linux/mm.h:page_to_nid())
328 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
331 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
333 * this function returns the index of the entry in the pte page which would
334 * control the given virtual address
336 static inline unsigned pte_index(unsigned long address)
338 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
341 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
343 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
346 static inline int pmd_bad(pmd_t pmd)
348 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
351 static inline unsigned long pages_to_mb(unsigned long npg)
353 return npg >> (20 - PAGE_SHIFT);
356 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
357 remap_pfn_range(vma, vaddr, pfn, size, prot)
359 #if PAGETABLE_LEVELS == 2
360 static inline int pud_large(pud_t pud)
366 #if PAGETABLE_LEVELS > 2
367 static inline int pud_none(pud_t pud)
369 return native_pud_val(pud) == 0;
372 static inline int pud_present(pud_t pud)
374 return pud_flags(pud) & _PAGE_PRESENT;
377 static inline unsigned long pud_page_vaddr(pud_t pud)
379 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
383 * Currently stuck as a macro due to indirect forward reference to
384 * linux/mmzone.h's __section_mem_map_addr() definition:
386 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
388 /* Find an entry in the second-level page table.. */
389 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
391 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
394 static inline unsigned long pmd_pfn(pmd_t pmd)
396 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
399 static inline int pud_large(pud_t pud)
401 return (pud_flags(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
402 (_PAGE_PSE | _PAGE_PRESENT);
405 static inline int pud_bad(pud_t pud)
407 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
409 #endif /* PAGETABLE_LEVELS > 2 */
411 #if PAGETABLE_LEVELS > 3
412 static inline int pgd_present(pgd_t pgd)
414 return pgd_flags(pgd) & _PAGE_PRESENT;
417 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
419 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
423 * Currently stuck as a macro due to indirect forward reference to
424 * linux/mmzone.h's __section_mem_map_addr() definition:
426 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
428 /* to find an entry in a page-table-directory. */
429 static inline unsigned pud_index(unsigned long address)
431 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
434 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
436 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
439 static inline int pgd_bad(pgd_t pgd)
441 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
444 static inline int pgd_none(pgd_t pgd)
446 return !native_pgd_val(pgd);
448 #endif /* PAGETABLE_LEVELS > 3 */
450 #endif /* __ASSEMBLY__ */
453 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
455 * this macro returns the index of the entry in the pgd page which would
456 * control the given virtual address
458 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
461 * pgd_offset() returns a (pgd_t *)
462 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
464 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
466 * a shortcut which implies the use of the kernel's pgd, instead
469 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
472 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
473 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
477 /* local pte updates need not use xchg for locking */
478 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
482 /* Pure native function needs no input for mm, addr */
483 native_pte_clear(NULL, 0, ptep);
487 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
488 pte_t *ptep , pte_t pte)
490 native_set_pte(ptep, pte);
493 #ifndef CONFIG_PARAVIRT
495 * Rules for using pte_update - it must be called after any PTE update which
496 * has not been done using the set_pte / clear_pte interfaces. It is used by
497 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
498 * updates should either be sets, clears, or set_pte_atomic for P->P
499 * transitions, which means this hook should only be called for user PTEs.
500 * This hook implies a P->P protection or access change has taken place, which
501 * requires a subsequent TLB flush. The notification can optionally be delayed
502 * until the TLB flush event by using the pte_update_defer form of the
503 * interface, but care must be taken to assure that the flush happens while
504 * still holding the same page table lock so that the shadow and primary pages
505 * do not become out of sync on SMP.
507 #define pte_update(mm, addr, ptep) do { } while (0)
508 #define pte_update_defer(mm, addr, ptep) do { } while (0)
512 * We only update the dirty/accessed state if we set
513 * the dirty bit by hand in the kernel, since the hardware
514 * will do the accessed bit for us, and we don't want to
515 * race with other CPU's that might be updating the dirty
516 * bit at the same time.
518 struct vm_area_struct;
520 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
521 extern int ptep_set_access_flags(struct vm_area_struct *vma,
522 unsigned long address, pte_t *ptep,
523 pte_t entry, int dirty);
525 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
526 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
527 unsigned long addr, pte_t *ptep);
529 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
530 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
531 unsigned long address, pte_t *ptep);
533 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
534 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
537 pte_t pte = native_ptep_get_and_clear(ptep);
538 pte_update(mm, addr, ptep);
542 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
543 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
544 unsigned long addr, pte_t *ptep,
550 * Full address destruction in progress; paravirt does not
551 * care about updates and native needs no locking
553 pte = native_local_ptep_get_and_clear(ptep);
555 pte = ptep_get_and_clear(mm, addr, ptep);
560 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
561 static inline void ptep_set_wrprotect(struct mm_struct *mm,
562 unsigned long addr, pte_t *ptep)
564 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
565 pte_update(mm, addr, ptep);
569 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
571 * dst - pointer to pgd range anwhere on a pgd page
573 * count - the number of pgds to copy.
575 * dst and src can be on the same page, but the range must not overlap,
576 * and must not cross a page boundary.
578 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
580 memcpy(dst, src, count * sizeof(pgd_t));
584 #include <asm-generic/pgtable.h>
585 #endif /* __ASSEMBLY__ */
587 #endif /* _ASM_X86_PGTABLE_H */