1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
7 #include <asm/pgtable_types.h>
10 * Macro to mark a page protection value as UC-
12 #define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 > 3) \
14 ? (__pgprot(pgprot_val(prot) | \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
19 #include <asm/x86_init.h>
21 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
22 void ptdump_walk_pgd_level_checkwx(void);
24 #ifdef CONFIG_DEBUG_WX
25 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
27 #define debug_checkwx() do { } while (0)
31 * ZERO_PAGE is a global shared page that is always zero: used
32 * for zero-mapped memory areas etc..
34 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
36 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
38 extern spinlock_t pgd_lock;
39 extern struct list_head pgd_list;
41 extern struct mm_struct *pgd_page_get_mm(struct page *page);
43 #ifdef CONFIG_PARAVIRT
44 #include <asm/paravirt.h>
45 #else /* !CONFIG_PARAVIRT */
46 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
47 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
48 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
50 #define set_pte_atomic(ptep, pte) \
51 native_set_pte_atomic(ptep, pte)
53 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
55 #ifndef __PAGETABLE_PUD_FOLDED
56 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
57 #define pgd_clear(pgd) native_pgd_clear(pgd)
61 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
64 #ifndef __PAGETABLE_PMD_FOLDED
65 #define pud_clear(pud) native_pud_clear(pud)
68 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
69 #define pmd_clear(pmd) native_pmd_clear(pmd)
71 #define pte_update(mm, addr, ptep) do { } while (0)
72 #define pte_update_defer(mm, addr, ptep) do { } while (0)
73 #define pmd_update(mm, addr, ptep) do { } while (0)
74 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
76 #define pgd_val(x) native_pgd_val(x)
77 #define __pgd(x) native_make_pgd(x)
79 #ifndef __PAGETABLE_PUD_FOLDED
80 #define pud_val(x) native_pud_val(x)
81 #define __pud(x) native_make_pud(x)
84 #ifndef __PAGETABLE_PMD_FOLDED
85 #define pmd_val(x) native_pmd_val(x)
86 #define __pmd(x) native_make_pmd(x)
89 #define pte_val(x) native_pte_val(x)
90 #define __pte(x) native_make_pte(x)
92 #define arch_end_context_switch(prev) do {} while(0)
94 #endif /* CONFIG_PARAVIRT */
97 * The following only work if pte_present() is true.
98 * Undefined behaviour if not..
100 static inline int pte_dirty(pte_t pte)
102 return pte_flags(pte) & _PAGE_DIRTY;
105 static inline int pte_young(pte_t pte)
107 return pte_flags(pte) & _PAGE_ACCESSED;
110 static inline int pmd_dirty(pmd_t pmd)
112 return pmd_flags(pmd) & _PAGE_DIRTY;
115 static inline int pmd_young(pmd_t pmd)
117 return pmd_flags(pmd) & _PAGE_ACCESSED;
120 static inline int pte_write(pte_t pte)
122 return pte_flags(pte) & _PAGE_RW;
125 static inline int pte_huge(pte_t pte)
127 return pte_flags(pte) & _PAGE_PSE;
130 static inline int pte_global(pte_t pte)
132 return pte_flags(pte) & _PAGE_GLOBAL;
135 static inline int pte_exec(pte_t pte)
137 return !(pte_flags(pte) & _PAGE_NX);
140 static inline int pte_special(pte_t pte)
142 return pte_flags(pte) & _PAGE_SPECIAL;
145 static inline unsigned long pte_pfn(pte_t pte)
147 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
150 static inline unsigned long pmd_pfn(pmd_t pmd)
152 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
155 static inline unsigned long pud_pfn(pud_t pud)
157 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
160 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
162 static inline int pmd_large(pmd_t pte)
164 return pmd_flags(pte) & _PAGE_PSE;
167 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
168 static inline int pmd_trans_splitting(pmd_t pmd)
170 return pmd_val(pmd) & _PAGE_SPLITTING;
173 static inline int pmd_trans_huge(pmd_t pmd)
175 return pmd_val(pmd) & _PAGE_PSE;
178 static inline int has_transparent_hugepage(void)
182 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
184 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
186 pteval_t v = native_pte_val(pte);
188 return native_make_pte(v | set);
191 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
193 pteval_t v = native_pte_val(pte);
195 return native_make_pte(v & ~clear);
198 static inline pte_t pte_mkclean(pte_t pte)
200 return pte_clear_flags(pte, _PAGE_DIRTY);
203 static inline pte_t pte_mkold(pte_t pte)
205 return pte_clear_flags(pte, _PAGE_ACCESSED);
208 static inline pte_t pte_wrprotect(pte_t pte)
210 return pte_clear_flags(pte, _PAGE_RW);
213 static inline pte_t pte_mkexec(pte_t pte)
215 return pte_clear_flags(pte, _PAGE_NX);
218 static inline pte_t pte_mkdirty(pte_t pte)
220 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
223 static inline pte_t pte_mkyoung(pte_t pte)
225 return pte_set_flags(pte, _PAGE_ACCESSED);
228 static inline pte_t pte_mkwrite(pte_t pte)
230 return pte_set_flags(pte, _PAGE_RW);
233 static inline pte_t pte_mkhuge(pte_t pte)
235 return pte_set_flags(pte, _PAGE_PSE);
238 static inline pte_t pte_clrhuge(pte_t pte)
240 return pte_clear_flags(pte, _PAGE_PSE);
243 static inline pte_t pte_mkglobal(pte_t pte)
245 return pte_set_flags(pte, _PAGE_GLOBAL);
248 static inline pte_t pte_clrglobal(pte_t pte)
250 return pte_clear_flags(pte, _PAGE_GLOBAL);
253 static inline pte_t pte_mkspecial(pte_t pte)
255 return pte_set_flags(pte, _PAGE_SPECIAL);
258 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
260 pmdval_t v = native_pmd_val(pmd);
262 return __pmd(v | set);
265 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
267 pmdval_t v = native_pmd_val(pmd);
269 return __pmd(v & ~clear);
272 static inline pmd_t pmd_mkold(pmd_t pmd)
274 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
277 static inline pmd_t pmd_wrprotect(pmd_t pmd)
279 return pmd_clear_flags(pmd, _PAGE_RW);
282 static inline pmd_t pmd_mkdirty(pmd_t pmd)
284 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
287 static inline pmd_t pmd_mkhuge(pmd_t pmd)
289 return pmd_set_flags(pmd, _PAGE_PSE);
292 static inline pmd_t pmd_mkyoung(pmd_t pmd)
294 return pmd_set_flags(pmd, _PAGE_ACCESSED);
297 static inline pmd_t pmd_mkwrite(pmd_t pmd)
299 return pmd_set_flags(pmd, _PAGE_RW);
302 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
304 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
307 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
308 static inline int pte_soft_dirty(pte_t pte)
310 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
313 static inline int pmd_soft_dirty(pmd_t pmd)
315 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
318 static inline pte_t pte_mksoft_dirty(pte_t pte)
320 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
323 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
325 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
328 static inline pte_t pte_clear_soft_dirty(pte_t pte)
330 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
333 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
335 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
338 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
341 * Mask out unsupported bits in a present pgprot. Non-present pgprots
342 * can use those bits for other purposes, so leave them be.
344 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
346 pgprotval_t protval = pgprot_val(pgprot);
348 if (protval & _PAGE_PRESENT)
349 protval &= __supported_pte_mask;
354 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
356 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
357 massage_pgprot(pgprot));
360 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
362 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
363 massage_pgprot(pgprot));
366 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
368 pteval_t val = pte_val(pte);
371 * Chop off the NX bit (if present), and add the NX portion of
372 * the newprot (if present):
374 val &= _PAGE_CHG_MASK;
375 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
380 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
382 pmdval_t val = pmd_val(pmd);
384 val &= _HPAGE_CHG_MASK;
385 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
390 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
391 #define pgprot_modify pgprot_modify
392 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
394 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
395 pgprotval_t addbits = pgprot_val(newprot);
396 return __pgprot(preservebits | addbits);
399 #define pte_pgprot(x) __pgprot(pte_flags(x))
400 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
401 #define pud_pgprot(x) __pgprot(pud_flags(x))
403 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
405 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
406 enum page_cache_mode pcm,
407 enum page_cache_mode new_pcm)
410 * PAT type is always WB for untracked ranges, so no need to check.
412 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
416 * Certain new memtypes are not allowed with certain
418 * - request is uncached, return cannot be write-back
419 * - request is write-combine, return cannot be write-back
420 * - request is write-through, return cannot be write-back
421 * - request is write-through, return cannot be write-combine
423 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
424 new_pcm == _PAGE_CACHE_MODE_WB) ||
425 (pcm == _PAGE_CACHE_MODE_WC &&
426 new_pcm == _PAGE_CACHE_MODE_WB) ||
427 (pcm == _PAGE_CACHE_MODE_WT &&
428 new_pcm == _PAGE_CACHE_MODE_WB) ||
429 (pcm == _PAGE_CACHE_MODE_WT &&
430 new_pcm == _PAGE_CACHE_MODE_WC)) {
437 pmd_t *populate_extra_pmd(unsigned long vaddr);
438 pte_t *populate_extra_pte(unsigned long vaddr);
439 #endif /* __ASSEMBLY__ */
442 # include <asm/pgtable_32.h>
444 # include <asm/pgtable_64.h>
448 #include <linux/mm_types.h>
449 #include <linux/mmdebug.h>
450 #include <linux/log2.h>
452 static inline int pte_none(pte_t pte)
457 #define __HAVE_ARCH_PTE_SAME
458 static inline int pte_same(pte_t a, pte_t b)
460 return a.pte == b.pte;
463 static inline int pte_present(pte_t a)
465 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
468 #define pte_accessible pte_accessible
469 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
471 if (pte_flags(a) & _PAGE_PRESENT)
474 if ((pte_flags(a) & _PAGE_PROTNONE) &&
475 mm_tlb_flush_pending(mm))
481 static inline int pte_hidden(pte_t pte)
483 return pte_flags(pte) & _PAGE_HIDDEN;
486 static inline int pmd_present(pmd_t pmd)
489 * Checking for _PAGE_PSE is needed too because
490 * split_huge_page will temporarily clear the present bit (but
491 * the _PAGE_PSE flag will remain set at all times while the
492 * _PAGE_PRESENT bit is clear).
494 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
497 #ifdef CONFIG_NUMA_BALANCING
499 * These work without NUMA balancing but the kernel does not care. See the
500 * comment in include/asm-generic/pgtable.h
502 static inline int pte_protnone(pte_t pte)
504 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
508 static inline int pmd_protnone(pmd_t pmd)
510 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
513 #endif /* CONFIG_NUMA_BALANCING */
515 static inline int pmd_none(pmd_t pmd)
517 /* Only check low word on 32-bit platforms, since it might be
518 out of sync with upper half. */
519 return (unsigned long)native_pmd_val(pmd) == 0;
522 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
524 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
528 * Currently stuck as a macro due to indirect forward reference to
529 * linux/mmzone.h's __section_mem_map_addr() definition:
531 #define pmd_page(pmd) \
532 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
535 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
537 * this macro returns the index of the entry in the pmd page which would
538 * control the given virtual address
540 static inline unsigned long pmd_index(unsigned long address)
542 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
546 * Conversion functions: convert a page and protection to a page entry,
547 * and a page entry and page directory to the page they refer to.
549 * (Currently stuck as a macro because of indirect forward reference
550 * to linux/mm.h:page_to_nid())
552 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
555 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
557 * this function returns the index of the entry in the pte page which would
558 * control the given virtual address
560 static inline unsigned long pte_index(unsigned long address)
562 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
565 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
567 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
570 static inline int pmd_bad(pmd_t pmd)
572 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
575 static inline unsigned long pages_to_mb(unsigned long npg)
577 return npg >> (20 - PAGE_SHIFT);
580 #if CONFIG_PGTABLE_LEVELS > 2
581 static inline int pud_none(pud_t pud)
583 return native_pud_val(pud) == 0;
586 static inline int pud_present(pud_t pud)
588 return pud_flags(pud) & _PAGE_PRESENT;
591 static inline unsigned long pud_page_vaddr(pud_t pud)
593 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
597 * Currently stuck as a macro due to indirect forward reference to
598 * linux/mmzone.h's __section_mem_map_addr() definition:
600 #define pud_page(pud) \
601 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
603 /* Find an entry in the second-level page table.. */
604 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
606 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
609 static inline int pud_large(pud_t pud)
611 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
612 (_PAGE_PSE | _PAGE_PRESENT);
615 static inline int pud_bad(pud_t pud)
617 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
620 static inline int pud_large(pud_t pud)
624 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
626 #if CONFIG_PGTABLE_LEVELS > 3
627 static inline int pgd_present(pgd_t pgd)
629 return pgd_flags(pgd) & _PAGE_PRESENT;
632 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
634 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
638 * Currently stuck as a macro due to indirect forward reference to
639 * linux/mmzone.h's __section_mem_map_addr() definition:
641 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
643 /* to find an entry in a page-table-directory. */
644 static inline unsigned long pud_index(unsigned long address)
646 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
649 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
651 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
654 static inline int pgd_bad(pgd_t pgd)
656 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
659 static inline int pgd_none(pgd_t pgd)
661 return !native_pgd_val(pgd);
663 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
665 #endif /* __ASSEMBLY__ */
668 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
670 * this macro returns the index of the entry in the pgd page which would
671 * control the given virtual address
673 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
676 * pgd_offset() returns a (pgd_t *)
677 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
679 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
681 * a shortcut which implies the use of the kernel's pgd, instead
684 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
687 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
688 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
692 extern int direct_gbpages;
693 void init_mem_mapping(void);
694 void early_alloc_pgt_buf(void);
696 /* local pte updates need not use xchg for locking */
697 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
701 /* Pure native function needs no input for mm, addr */
702 native_pte_clear(NULL, 0, ptep);
706 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
710 native_pmd_clear(pmdp);
714 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
715 pte_t *ptep , pte_t pte)
717 native_set_pte(ptep, pte);
720 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
721 pmd_t *pmdp , pmd_t pmd)
723 native_set_pmd(pmdp, pmd);
726 #ifndef CONFIG_PARAVIRT
728 * Rules for using pte_update - it must be called after any PTE update which
729 * has not been done using the set_pte / clear_pte interfaces. It is used by
730 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
731 * updates should either be sets, clears, or set_pte_atomic for P->P
732 * transitions, which means this hook should only be called for user PTEs.
733 * This hook implies a P->P protection or access change has taken place, which
734 * requires a subsequent TLB flush. The notification can optionally be delayed
735 * until the TLB flush event by using the pte_update_defer form of the
736 * interface, but care must be taken to assure that the flush happens while
737 * still holding the same page table lock so that the shadow and primary pages
738 * do not become out of sync on SMP.
740 #define pte_update(mm, addr, ptep) do { } while (0)
741 #define pte_update_defer(mm, addr, ptep) do { } while (0)
745 * We only update the dirty/accessed state if we set
746 * the dirty bit by hand in the kernel, since the hardware
747 * will do the accessed bit for us, and we don't want to
748 * race with other CPU's that might be updating the dirty
749 * bit at the same time.
751 struct vm_area_struct;
753 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
754 extern int ptep_set_access_flags(struct vm_area_struct *vma,
755 unsigned long address, pte_t *ptep,
756 pte_t entry, int dirty);
758 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
759 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
760 unsigned long addr, pte_t *ptep);
762 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
763 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
764 unsigned long address, pte_t *ptep);
766 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
767 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
770 pte_t pte = native_ptep_get_and_clear(ptep);
771 pte_update(mm, addr, ptep);
775 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
776 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
777 unsigned long addr, pte_t *ptep,
783 * Full address destruction in progress; paravirt does not
784 * care about updates and native needs no locking
786 pte = native_local_ptep_get_and_clear(ptep);
788 pte = ptep_get_and_clear(mm, addr, ptep);
793 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
794 static inline void ptep_set_wrprotect(struct mm_struct *mm,
795 unsigned long addr, pte_t *ptep)
797 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
798 pte_update(mm, addr, ptep);
801 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
803 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
805 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
806 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
807 unsigned long address, pmd_t *pmdp,
808 pmd_t entry, int dirty);
810 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
811 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
812 unsigned long addr, pmd_t *pmdp);
814 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
815 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
816 unsigned long address, pmd_t *pmdp);
819 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
820 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
821 unsigned long addr, pmd_t *pmdp);
823 #define __HAVE_ARCH_PMD_WRITE
824 static inline int pmd_write(pmd_t pmd)
826 return pmd_flags(pmd) & _PAGE_RW;
829 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
830 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
833 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
834 pmd_update(mm, addr, pmdp);
838 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
839 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
840 unsigned long addr, pmd_t *pmdp)
842 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
843 pmd_update(mm, addr, pmdp);
847 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
849 * dst - pointer to pgd range anwhere on a pgd page
851 * count - the number of pgds to copy.
853 * dst and src can be on the same page, but the range must not overlap,
854 * and must not cross a page boundary.
856 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
858 memcpy(dst, src, count * sizeof(pgd_t));
861 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
862 static inline int page_level_shift(enum pg_level level)
864 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
866 static inline unsigned long page_level_size(enum pg_level level)
868 return 1UL << page_level_shift(level);
870 static inline unsigned long page_level_mask(enum pg_level level)
872 return ~(page_level_size(level) - 1);
876 * The x86 doesn't have any external MMU info: the kernel page
877 * tables contain all the necessary information.
879 static inline void update_mmu_cache(struct vm_area_struct *vma,
880 unsigned long addr, pte_t *ptep)
883 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
884 unsigned long addr, pmd_t *pmd)
888 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
889 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
891 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
894 static inline int pte_swp_soft_dirty(pte_t pte)
896 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
899 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
901 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
905 #include <asm-generic/pgtable.h>
906 #endif /* __ASSEMBLY__ */
908 #endif /* _ASM_X86_PGTABLE_H */