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)
73 #define pgd_val(x) native_pgd_val(x)
74 #define __pgd(x) native_make_pgd(x)
76 #ifndef __PAGETABLE_PUD_FOLDED
77 #define pud_val(x) native_pud_val(x)
78 #define __pud(x) native_make_pud(x)
81 #ifndef __PAGETABLE_PMD_FOLDED
82 #define pmd_val(x) native_pmd_val(x)
83 #define __pmd(x) native_make_pmd(x)
86 #define pte_val(x) native_pte_val(x)
87 #define __pte(x) native_make_pte(x)
89 #define arch_end_context_switch(prev) do {} while(0)
91 #endif /* CONFIG_PARAVIRT */
94 * The following only work if pte_present() is true.
95 * Undefined behaviour if not..
97 static inline int pte_dirty(pte_t pte)
99 return pte_flags(pte) & _PAGE_DIRTY;
102 static inline int pte_young(pte_t pte)
104 return pte_flags(pte) & _PAGE_ACCESSED;
107 static inline int pmd_dirty(pmd_t pmd)
109 return pmd_flags(pmd) & _PAGE_DIRTY;
112 static inline int pmd_young(pmd_t pmd)
114 return pmd_flags(pmd) & _PAGE_ACCESSED;
117 static inline int pte_write(pte_t pte)
119 return pte_flags(pte) & _PAGE_RW;
122 static inline int pte_huge(pte_t pte)
124 return pte_flags(pte) & _PAGE_PSE;
127 static inline int pte_global(pte_t pte)
129 return pte_flags(pte) & _PAGE_GLOBAL;
132 static inline int pte_exec(pte_t pte)
134 return !(pte_flags(pte) & _PAGE_NX);
137 static inline int pte_special(pte_t pte)
139 return pte_flags(pte) & _PAGE_SPECIAL;
142 static inline unsigned long pte_pfn(pte_t pte)
144 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
147 static inline unsigned long pmd_pfn(pmd_t pmd)
149 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
152 static inline unsigned long pud_pfn(pud_t pud)
154 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
157 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
159 static inline int pmd_large(pmd_t pte)
161 return pmd_flags(pte) & _PAGE_PSE;
164 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
165 static inline int pmd_trans_huge(pmd_t pmd)
167 return pmd_val(pmd) & _PAGE_PSE;
170 static inline int has_transparent_hugepage(void)
174 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
176 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
178 pteval_t v = native_pte_val(pte);
180 return native_make_pte(v | set);
183 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
185 pteval_t v = native_pte_val(pte);
187 return native_make_pte(v & ~clear);
190 static inline pte_t pte_mkclean(pte_t pte)
192 return pte_clear_flags(pte, _PAGE_DIRTY);
195 static inline pte_t pte_mkold(pte_t pte)
197 return pte_clear_flags(pte, _PAGE_ACCESSED);
200 static inline pte_t pte_wrprotect(pte_t pte)
202 return pte_clear_flags(pte, _PAGE_RW);
205 static inline pte_t pte_mkexec(pte_t pte)
207 return pte_clear_flags(pte, _PAGE_NX);
210 static inline pte_t pte_mkdirty(pte_t pte)
212 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
215 static inline pte_t pte_mkyoung(pte_t pte)
217 return pte_set_flags(pte, _PAGE_ACCESSED);
220 static inline pte_t pte_mkwrite(pte_t pte)
222 return pte_set_flags(pte, _PAGE_RW);
225 static inline pte_t pte_mkhuge(pte_t pte)
227 return pte_set_flags(pte, _PAGE_PSE);
230 static inline pte_t pte_clrhuge(pte_t pte)
232 return pte_clear_flags(pte, _PAGE_PSE);
235 static inline pte_t pte_mkglobal(pte_t pte)
237 return pte_set_flags(pte, _PAGE_GLOBAL);
240 static inline pte_t pte_clrglobal(pte_t pte)
242 return pte_clear_flags(pte, _PAGE_GLOBAL);
245 static inline pte_t pte_mkspecial(pte_t pte)
247 return pte_set_flags(pte, _PAGE_SPECIAL);
250 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
252 pmdval_t v = native_pmd_val(pmd);
254 return __pmd(v | set);
257 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
259 pmdval_t v = native_pmd_val(pmd);
261 return __pmd(v & ~clear);
264 static inline pmd_t pmd_mkold(pmd_t pmd)
266 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
269 static inline pmd_t pmd_wrprotect(pmd_t pmd)
271 return pmd_clear_flags(pmd, _PAGE_RW);
274 static inline pmd_t pmd_mkdirty(pmd_t pmd)
276 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
279 static inline pmd_t pmd_mkhuge(pmd_t pmd)
281 return pmd_set_flags(pmd, _PAGE_PSE);
284 static inline pmd_t pmd_mkyoung(pmd_t pmd)
286 return pmd_set_flags(pmd, _PAGE_ACCESSED);
289 static inline pmd_t pmd_mkwrite(pmd_t pmd)
291 return pmd_set_flags(pmd, _PAGE_RW);
294 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
296 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
299 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
300 static inline int pte_soft_dirty(pte_t pte)
302 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
305 static inline int pmd_soft_dirty(pmd_t pmd)
307 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
310 static inline pte_t pte_mksoft_dirty(pte_t pte)
312 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
315 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
317 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
320 static inline pte_t pte_clear_soft_dirty(pte_t pte)
322 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
325 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
327 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
330 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
333 * Mask out unsupported bits in a present pgprot. Non-present pgprots
334 * can use those bits for other purposes, so leave them be.
336 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
338 pgprotval_t protval = pgprot_val(pgprot);
340 if (protval & _PAGE_PRESENT)
341 protval &= __supported_pte_mask;
346 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
348 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
349 massage_pgprot(pgprot));
352 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
354 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
355 massage_pgprot(pgprot));
358 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
360 pteval_t val = pte_val(pte);
363 * Chop off the NX bit (if present), and add the NX portion of
364 * the newprot (if present):
366 val &= _PAGE_CHG_MASK;
367 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
372 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
374 pmdval_t val = pmd_val(pmd);
376 val &= _HPAGE_CHG_MASK;
377 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
382 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
383 #define pgprot_modify pgprot_modify
384 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
386 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
387 pgprotval_t addbits = pgprot_val(newprot);
388 return __pgprot(preservebits | addbits);
391 #define pte_pgprot(x) __pgprot(pte_flags(x))
392 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
393 #define pud_pgprot(x) __pgprot(pud_flags(x))
395 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
397 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
398 enum page_cache_mode pcm,
399 enum page_cache_mode new_pcm)
402 * PAT type is always WB for untracked ranges, so no need to check.
404 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
408 * Certain new memtypes are not allowed with certain
410 * - request is uncached, return cannot be write-back
411 * - request is write-combine, return cannot be write-back
412 * - request is write-through, return cannot be write-back
413 * - request is write-through, return cannot be write-combine
415 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
416 new_pcm == _PAGE_CACHE_MODE_WB) ||
417 (pcm == _PAGE_CACHE_MODE_WC &&
418 new_pcm == _PAGE_CACHE_MODE_WB) ||
419 (pcm == _PAGE_CACHE_MODE_WT &&
420 new_pcm == _PAGE_CACHE_MODE_WB) ||
421 (pcm == _PAGE_CACHE_MODE_WT &&
422 new_pcm == _PAGE_CACHE_MODE_WC)) {
429 pmd_t *populate_extra_pmd(unsigned long vaddr);
430 pte_t *populate_extra_pte(unsigned long vaddr);
431 #endif /* __ASSEMBLY__ */
434 # include <asm/pgtable_32.h>
436 # include <asm/pgtable_64.h>
440 #include <linux/mm_types.h>
441 #include <linux/mmdebug.h>
442 #include <linux/log2.h>
444 static inline int pte_none(pte_t pte)
449 #define __HAVE_ARCH_PTE_SAME
450 static inline int pte_same(pte_t a, pte_t b)
452 return a.pte == b.pte;
455 static inline int pte_present(pte_t a)
457 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
460 #define pte_accessible pte_accessible
461 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
463 if (pte_flags(a) & _PAGE_PRESENT)
466 if ((pte_flags(a) & _PAGE_PROTNONE) &&
467 mm_tlb_flush_pending(mm))
473 static inline int pte_hidden(pte_t pte)
475 return pte_flags(pte) & _PAGE_HIDDEN;
478 static inline int pmd_present(pmd_t pmd)
481 * Checking for _PAGE_PSE is needed too because
482 * split_huge_page will temporarily clear the present bit (but
483 * the _PAGE_PSE flag will remain set at all times while the
484 * _PAGE_PRESENT bit is clear).
486 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
489 #ifdef CONFIG_NUMA_BALANCING
491 * These work without NUMA balancing but the kernel does not care. See the
492 * comment in include/asm-generic/pgtable.h
494 static inline int pte_protnone(pte_t pte)
496 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
500 static inline int pmd_protnone(pmd_t pmd)
502 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
505 #endif /* CONFIG_NUMA_BALANCING */
507 static inline int pmd_none(pmd_t pmd)
509 /* Only check low word on 32-bit platforms, since it might be
510 out of sync with upper half. */
511 return (unsigned long)native_pmd_val(pmd) == 0;
514 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
516 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
520 * Currently stuck as a macro due to indirect forward reference to
521 * linux/mmzone.h's __section_mem_map_addr() definition:
523 #define pmd_page(pmd) \
524 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
527 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
529 * this macro returns the index of the entry in the pmd page which would
530 * control the given virtual address
532 static inline unsigned long pmd_index(unsigned long address)
534 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
538 * Conversion functions: convert a page and protection to a page entry,
539 * and a page entry and page directory to the page they refer to.
541 * (Currently stuck as a macro because of indirect forward reference
542 * to linux/mm.h:page_to_nid())
544 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
547 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
549 * this function returns the index of the entry in the pte page which would
550 * control the given virtual address
552 static inline unsigned long pte_index(unsigned long address)
554 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
557 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
559 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
562 static inline int pmd_bad(pmd_t pmd)
564 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
567 static inline unsigned long pages_to_mb(unsigned long npg)
569 return npg >> (20 - PAGE_SHIFT);
572 #if CONFIG_PGTABLE_LEVELS > 2
573 static inline int pud_none(pud_t pud)
575 return native_pud_val(pud) == 0;
578 static inline int pud_present(pud_t pud)
580 return pud_flags(pud) & _PAGE_PRESENT;
583 static inline unsigned long pud_page_vaddr(pud_t pud)
585 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
589 * Currently stuck as a macro due to indirect forward reference to
590 * linux/mmzone.h's __section_mem_map_addr() definition:
592 #define pud_page(pud) \
593 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
595 /* Find an entry in the second-level page table.. */
596 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
598 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
601 static inline int pud_large(pud_t pud)
603 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
604 (_PAGE_PSE | _PAGE_PRESENT);
607 static inline int pud_bad(pud_t pud)
609 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
612 static inline int pud_large(pud_t pud)
616 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
618 #if CONFIG_PGTABLE_LEVELS > 3
619 static inline int pgd_present(pgd_t pgd)
621 return pgd_flags(pgd) & _PAGE_PRESENT;
624 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
626 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
630 * Currently stuck as a macro due to indirect forward reference to
631 * linux/mmzone.h's __section_mem_map_addr() definition:
633 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
635 /* to find an entry in a page-table-directory. */
636 static inline unsigned long pud_index(unsigned long address)
638 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
641 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
643 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
646 static inline int pgd_bad(pgd_t pgd)
648 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
651 static inline int pgd_none(pgd_t pgd)
653 return !native_pgd_val(pgd);
655 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
657 #endif /* __ASSEMBLY__ */
660 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
662 * this macro returns the index of the entry in the pgd page which would
663 * control the given virtual address
665 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
668 * pgd_offset() returns a (pgd_t *)
669 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
671 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
673 * a shortcut which implies the use of the kernel's pgd, instead
676 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
679 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
680 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
684 extern int direct_gbpages;
685 void init_mem_mapping(void);
686 void early_alloc_pgt_buf(void);
688 /* local pte updates need not use xchg for locking */
689 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
693 /* Pure native function needs no input for mm, addr */
694 native_pte_clear(NULL, 0, ptep);
698 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
702 native_pmd_clear(pmdp);
706 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
707 pte_t *ptep , pte_t pte)
709 native_set_pte(ptep, pte);
712 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
713 pmd_t *pmdp , pmd_t pmd)
715 native_set_pmd(pmdp, pmd);
718 #ifndef CONFIG_PARAVIRT
720 * Rules for using pte_update - it must be called after any PTE update which
721 * has not been done using the set_pte / clear_pte interfaces. It is used by
722 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
723 * updates should either be sets, clears, or set_pte_atomic for P->P
724 * transitions, which means this hook should only be called for user PTEs.
725 * This hook implies a P->P protection or access change has taken place, which
726 * requires a subsequent TLB flush.
728 #define pte_update(mm, addr, ptep) do { } while (0)
732 * We only update the dirty/accessed state if we set
733 * the dirty bit by hand in the kernel, since the hardware
734 * will do the accessed bit for us, and we don't want to
735 * race with other CPU's that might be updating the dirty
736 * bit at the same time.
738 struct vm_area_struct;
740 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
741 extern int ptep_set_access_flags(struct vm_area_struct *vma,
742 unsigned long address, pte_t *ptep,
743 pte_t entry, int dirty);
745 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
746 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
747 unsigned long addr, pte_t *ptep);
749 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
750 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
751 unsigned long address, pte_t *ptep);
753 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
754 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
757 pte_t pte = native_ptep_get_and_clear(ptep);
758 pte_update(mm, addr, ptep);
762 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
763 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
764 unsigned long addr, pte_t *ptep,
770 * Full address destruction in progress; paravirt does not
771 * care about updates and native needs no locking
773 pte = native_local_ptep_get_and_clear(ptep);
775 pte = ptep_get_and_clear(mm, addr, ptep);
780 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
781 static inline void ptep_set_wrprotect(struct mm_struct *mm,
782 unsigned long addr, pte_t *ptep)
784 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
785 pte_update(mm, addr, ptep);
788 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
790 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
792 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
793 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
794 unsigned long address, pmd_t *pmdp,
795 pmd_t entry, int dirty);
797 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
798 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
799 unsigned long addr, pmd_t *pmdp);
801 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
802 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
803 unsigned long address, pmd_t *pmdp);
806 #define __HAVE_ARCH_PMD_WRITE
807 static inline int pmd_write(pmd_t pmd)
809 return pmd_flags(pmd) & _PAGE_RW;
812 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
813 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
816 return native_pmdp_get_and_clear(pmdp);
819 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
820 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
821 unsigned long addr, pmd_t *pmdp)
823 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
827 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
829 * dst - pointer to pgd range anwhere on a pgd page
831 * count - the number of pgds to copy.
833 * dst and src can be on the same page, but the range must not overlap,
834 * and must not cross a page boundary.
836 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
838 memcpy(dst, src, count * sizeof(pgd_t));
841 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
842 static inline int page_level_shift(enum pg_level level)
844 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
846 static inline unsigned long page_level_size(enum pg_level level)
848 return 1UL << page_level_shift(level);
850 static inline unsigned long page_level_mask(enum pg_level level)
852 return ~(page_level_size(level) - 1);
856 * The x86 doesn't have any external MMU info: the kernel page
857 * tables contain all the necessary information.
859 static inline void update_mmu_cache(struct vm_area_struct *vma,
860 unsigned long addr, pte_t *ptep)
863 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
864 unsigned long addr, pmd_t *pmd)
868 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
869 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
871 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
874 static inline int pte_swp_soft_dirty(pte_t pte)
876 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
879 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
881 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
885 #include <asm-generic/pgtable.h>
886 #endif /* __ASSEMBLY__ */
888 #endif /* _ASM_X86_PGTABLE_H */