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) | _PAGE_CACHE_UC_MINUS)) \
19 #include <asm/x86_init.h>
22 * ZERO_PAGE is a global shared page that is always zero: used
23 * for zero-mapped memory areas etc..
25 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
27 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
29 extern spinlock_t pgd_lock;
30 extern struct list_head pgd_list;
32 extern struct mm_struct *pgd_page_get_mm(struct page *page);
34 #ifdef CONFIG_PARAVIRT
35 #include <asm/paravirt.h>
36 #else /* !CONFIG_PARAVIRT */
37 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
38 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
39 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
41 #define set_pte_atomic(ptep, pte) \
42 native_set_pte_atomic(ptep, pte)
44 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
46 #ifndef __PAGETABLE_PUD_FOLDED
47 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
48 #define pgd_clear(pgd) native_pgd_clear(pgd)
52 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
55 #ifndef __PAGETABLE_PMD_FOLDED
56 #define pud_clear(pud) native_pud_clear(pud)
59 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
60 #define pmd_clear(pmd) native_pmd_clear(pmd)
62 #define pte_update(mm, addr, ptep) do { } while (0)
63 #define pte_update_defer(mm, addr, ptep) do { } while (0)
64 #define pmd_update(mm, addr, ptep) do { } while (0)
65 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
67 #define pgd_val(x) native_pgd_val(x)
68 #define __pgd(x) native_make_pgd(x)
70 #ifndef __PAGETABLE_PUD_FOLDED
71 #define pud_val(x) native_pud_val(x)
72 #define __pud(x) native_make_pud(x)
75 #ifndef __PAGETABLE_PMD_FOLDED
76 #define pmd_val(x) native_pmd_val(x)
77 #define __pmd(x) native_make_pmd(x)
80 #define pte_val(x) native_pte_val(x)
81 #define __pte(x) native_make_pte(x)
83 #define arch_end_context_switch(prev) do {} while(0)
85 #endif /* CONFIG_PARAVIRT */
88 * The following only work if pte_present() is true.
89 * Undefined behaviour if not..
91 static inline int pte_dirty(pte_t pte)
93 return pte_flags(pte) & _PAGE_DIRTY;
96 static inline int pte_young(pte_t pte)
98 return pte_flags(pte) & _PAGE_ACCESSED;
101 static inline int pmd_young(pmd_t pmd)
103 return pmd_flags(pmd) & _PAGE_ACCESSED;
106 static inline int pte_write(pte_t pte)
108 return pte_flags(pte) & _PAGE_RW;
111 static inline int pte_file(pte_t pte)
113 return pte_flags(pte) & _PAGE_FILE;
116 static inline int pte_huge(pte_t pte)
118 return pte_flags(pte) & _PAGE_PSE;
121 static inline int pte_global(pte_t pte)
123 return pte_flags(pte) & _PAGE_GLOBAL;
126 static inline int pte_exec(pte_t pte)
128 return !(pte_flags(pte) & _PAGE_NX);
131 static inline int pte_special(pte_t pte)
133 return pte_flags(pte) & _PAGE_SPECIAL;
136 static inline unsigned long pte_pfn(pte_t pte)
138 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
141 static inline unsigned long pmd_pfn(pmd_t pmd)
143 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
146 static inline unsigned long pud_pfn(pud_t pud)
148 return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
151 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
153 static inline int pmd_large(pmd_t pte)
155 return pmd_flags(pte) & _PAGE_PSE;
158 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
159 static inline int pmd_trans_splitting(pmd_t pmd)
161 return pmd_val(pmd) & _PAGE_SPLITTING;
164 static inline int pmd_trans_huge(pmd_t pmd)
166 return pmd_val(pmd) & _PAGE_PSE;
169 static inline int has_transparent_hugepage(void)
173 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
175 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
177 pteval_t v = native_pte_val(pte);
179 return native_make_pte(v | set);
182 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
184 pteval_t v = native_pte_val(pte);
186 return native_make_pte(v & ~clear);
189 static inline pte_t pte_mkclean(pte_t pte)
191 return pte_clear_flags(pte, _PAGE_DIRTY);
194 static inline pte_t pte_mkold(pte_t pte)
196 return pte_clear_flags(pte, _PAGE_ACCESSED);
199 static inline pte_t pte_wrprotect(pte_t pte)
201 return pte_clear_flags(pte, _PAGE_RW);
204 static inline pte_t pte_mkexec(pte_t pte)
206 return pte_clear_flags(pte, _PAGE_NX);
209 static inline pte_t pte_mkdirty(pte_t pte)
211 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
214 static inline pte_t pte_mkyoung(pte_t pte)
216 return pte_set_flags(pte, _PAGE_ACCESSED);
219 static inline pte_t pte_mkwrite(pte_t pte)
221 return pte_set_flags(pte, _PAGE_RW);
224 static inline pte_t pte_mkhuge(pte_t pte)
226 return pte_set_flags(pte, _PAGE_PSE);
229 static inline pte_t pte_clrhuge(pte_t pte)
231 return pte_clear_flags(pte, _PAGE_PSE);
234 static inline pte_t pte_mkglobal(pte_t pte)
236 return pte_set_flags(pte, _PAGE_GLOBAL);
239 static inline pte_t pte_clrglobal(pte_t pte)
241 return pte_clear_flags(pte, _PAGE_GLOBAL);
244 static inline pte_t pte_mkspecial(pte_t pte)
246 return pte_set_flags(pte, _PAGE_SPECIAL);
249 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
251 pmdval_t v = native_pmd_val(pmd);
253 return __pmd(v | set);
256 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
258 pmdval_t v = native_pmd_val(pmd);
260 return __pmd(v & ~clear);
263 static inline pmd_t pmd_mkold(pmd_t pmd)
265 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
268 static inline pmd_t pmd_wrprotect(pmd_t pmd)
270 return pmd_clear_flags(pmd, _PAGE_RW);
273 static inline pmd_t pmd_mkdirty(pmd_t pmd)
275 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
278 static inline pmd_t pmd_mkhuge(pmd_t pmd)
280 return pmd_set_flags(pmd, _PAGE_PSE);
283 static inline pmd_t pmd_mkyoung(pmd_t pmd)
285 return pmd_set_flags(pmd, _PAGE_ACCESSED);
288 static inline pmd_t pmd_mkwrite(pmd_t pmd)
290 return pmd_set_flags(pmd, _PAGE_RW);
293 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
295 return pmd_clear_flags(pmd, _PAGE_PRESENT);
298 static inline int pte_soft_dirty(pte_t pte)
300 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
303 static inline int pmd_soft_dirty(pmd_t pmd)
305 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
308 static inline pte_t pte_mksoft_dirty(pte_t pte)
310 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
313 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
315 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
318 static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
320 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
323 static inline pte_t pte_file_mksoft_dirty(pte_t pte)
325 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
328 static inline int pte_file_soft_dirty(pte_t pte)
330 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
334 * Mask out unsupported bits in a present pgprot. Non-present pgprots
335 * can use those bits for other purposes, so leave them be.
337 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
339 pgprotval_t protval = pgprot_val(pgprot);
341 if (protval & _PAGE_PRESENT)
342 protval &= __supported_pte_mask;
347 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
349 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
350 massage_pgprot(pgprot));
353 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
355 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
356 massage_pgprot(pgprot));
359 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
361 pteval_t val = pte_val(pte);
364 * Chop off the NX bit (if present), and add the NX portion of
365 * the newprot (if present):
367 val &= _PAGE_CHG_MASK;
368 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
373 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
375 pmdval_t val = pmd_val(pmd);
377 val &= _HPAGE_CHG_MASK;
378 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
383 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
384 #define pgprot_modify pgprot_modify
385 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
387 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
388 pgprotval_t addbits = pgprot_val(newprot);
389 return __pgprot(preservebits | addbits);
392 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
394 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
396 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
398 unsigned long new_flags)
401 * PAT type is always WB for untracked ranges, so no need to check.
403 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
407 * Certain new memtypes are not allowed with certain
409 * - request is uncached, return cannot be write-back
410 * - request is write-combine, return cannot be write-back
412 if ((flags == _PAGE_CACHE_UC_MINUS &&
413 new_flags == _PAGE_CACHE_WB) ||
414 (flags == _PAGE_CACHE_WC &&
415 new_flags == _PAGE_CACHE_WB)) {
422 pmd_t *populate_extra_pmd(unsigned long vaddr);
423 pte_t *populate_extra_pte(unsigned long vaddr);
424 #endif /* __ASSEMBLY__ */
427 # include <asm/pgtable_32.h>
429 # include <asm/pgtable_64.h>
433 #include <linux/mm_types.h>
434 #include <linux/mmdebug.h>
435 #include <linux/log2.h>
437 static inline int pte_none(pte_t pte)
442 #define __HAVE_ARCH_PTE_SAME
443 static inline int pte_same(pte_t a, pte_t b)
445 return a.pte == b.pte;
448 static inline int pteval_present(pteval_t pteval)
451 * Yes Linus, _PAGE_PROTNONE == _PAGE_NUMA. Expressing it this
452 * way clearly states that the intent is that protnone and numa
453 * hinting ptes are considered present for the purposes of
454 * pagetable operations like zapping, protection changes, gup etc.
456 return pteval & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_NUMA);
459 static inline int pte_present(pte_t a)
461 return pteval_present(pte_flags(a));
464 #define pte_accessible pte_accessible
465 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
467 if (pte_flags(a) & _PAGE_PRESENT)
470 if ((pte_flags(a) & (_PAGE_PROTNONE | _PAGE_NUMA)) &&
471 mm_tlb_flush_pending(mm))
477 static inline int pte_hidden(pte_t pte)
479 return pte_flags(pte) & _PAGE_HIDDEN;
482 static inline int pmd_present(pmd_t pmd)
485 * Checking for _PAGE_PSE is needed too because
486 * split_huge_page will temporarily clear the present bit (but
487 * the _PAGE_PSE flag will remain set at all times while the
488 * _PAGE_PRESENT bit is clear).
490 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
494 static inline int pmd_none(pmd_t pmd)
496 /* Only check low word on 32-bit platforms, since it might be
497 out of sync with upper half. */
498 return (unsigned long)native_pmd_val(pmd) == 0;
501 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
503 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
507 * Currently stuck as a macro due to indirect forward reference to
508 * linux/mmzone.h's __section_mem_map_addr() definition:
510 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
513 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
515 * this macro returns the index of the entry in the pmd page which would
516 * control the given virtual address
518 static inline unsigned long pmd_index(unsigned long address)
520 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
524 * Conversion functions: convert a page and protection to a page entry,
525 * and a page entry and page directory to the page they refer to.
527 * (Currently stuck as a macro because of indirect forward reference
528 * to linux/mm.h:page_to_nid())
530 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
533 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
535 * this function returns the index of the entry in the pte page which would
536 * control the given virtual address
538 static inline unsigned long pte_index(unsigned long address)
540 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
543 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
545 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
548 static inline int pmd_bad(pmd_t pmd)
550 #ifdef CONFIG_NUMA_BALANCING
552 if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
555 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
558 static inline unsigned long pages_to_mb(unsigned long npg)
560 return npg >> (20 - PAGE_SHIFT);
563 #if PAGETABLE_LEVELS > 2
564 static inline int pud_none(pud_t pud)
566 return native_pud_val(pud) == 0;
569 static inline int pud_present(pud_t pud)
571 return pud_flags(pud) & _PAGE_PRESENT;
574 static inline unsigned long pud_page_vaddr(pud_t pud)
576 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
580 * Currently stuck as a macro due to indirect forward reference to
581 * linux/mmzone.h's __section_mem_map_addr() definition:
583 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
585 /* Find an entry in the second-level page table.. */
586 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
588 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
591 static inline int pud_large(pud_t pud)
593 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
594 (_PAGE_PSE | _PAGE_PRESENT);
597 static inline int pud_bad(pud_t pud)
599 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
602 static inline int pud_large(pud_t pud)
606 #endif /* PAGETABLE_LEVELS > 2 */
608 #if PAGETABLE_LEVELS > 3
609 static inline int pgd_present(pgd_t pgd)
611 return pgd_flags(pgd) & _PAGE_PRESENT;
614 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
616 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
620 * Currently stuck as a macro due to indirect forward reference to
621 * linux/mmzone.h's __section_mem_map_addr() definition:
623 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
625 /* to find an entry in a page-table-directory. */
626 static inline unsigned long pud_index(unsigned long address)
628 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
631 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
633 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
636 static inline int pgd_bad(pgd_t pgd)
638 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
641 static inline int pgd_none(pgd_t pgd)
643 return !native_pgd_val(pgd);
645 #endif /* PAGETABLE_LEVELS > 3 */
647 #endif /* __ASSEMBLY__ */
650 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
652 * this macro returns the index of the entry in the pgd page which would
653 * control the given virtual address
655 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
658 * pgd_offset() returns a (pgd_t *)
659 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
661 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
663 * a shortcut which implies the use of the kernel's pgd, instead
666 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
669 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
670 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
674 extern int direct_gbpages;
675 void init_mem_mapping(void);
676 void early_alloc_pgt_buf(void);
678 /* local pte updates need not use xchg for locking */
679 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
683 /* Pure native function needs no input for mm, addr */
684 native_pte_clear(NULL, 0, ptep);
688 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
692 native_pmd_clear(pmdp);
696 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
697 pte_t *ptep , pte_t pte)
699 native_set_pte(ptep, pte);
702 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
703 pmd_t *pmdp , pmd_t pmd)
705 native_set_pmd(pmdp, pmd);
708 #ifndef CONFIG_PARAVIRT
710 * Rules for using pte_update - it must be called after any PTE update which
711 * has not been done using the set_pte / clear_pte interfaces. It is used by
712 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
713 * updates should either be sets, clears, or set_pte_atomic for P->P
714 * transitions, which means this hook should only be called for user PTEs.
715 * This hook implies a P->P protection or access change has taken place, which
716 * requires a subsequent TLB flush. The notification can optionally be delayed
717 * until the TLB flush event by using the pte_update_defer form of the
718 * interface, but care must be taken to assure that the flush happens while
719 * still holding the same page table lock so that the shadow and primary pages
720 * do not become out of sync on SMP.
722 #define pte_update(mm, addr, ptep) do { } while (0)
723 #define pte_update_defer(mm, addr, ptep) do { } while (0)
727 * We only update the dirty/accessed state if we set
728 * the dirty bit by hand in the kernel, since the hardware
729 * will do the accessed bit for us, and we don't want to
730 * race with other CPU's that might be updating the dirty
731 * bit at the same time.
733 struct vm_area_struct;
735 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
736 extern int ptep_set_access_flags(struct vm_area_struct *vma,
737 unsigned long address, pte_t *ptep,
738 pte_t entry, int dirty);
740 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
741 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
742 unsigned long addr, pte_t *ptep);
744 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
745 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
746 unsigned long address, pte_t *ptep);
748 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
749 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
752 pte_t pte = native_ptep_get_and_clear(ptep);
753 pte_update(mm, addr, ptep);
757 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
758 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
759 unsigned long addr, pte_t *ptep,
765 * Full address destruction in progress; paravirt does not
766 * care about updates and native needs no locking
768 pte = native_local_ptep_get_and_clear(ptep);
770 pte = ptep_get_and_clear(mm, addr, ptep);
775 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
776 static inline void ptep_set_wrprotect(struct mm_struct *mm,
777 unsigned long addr, pte_t *ptep)
779 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
780 pte_update(mm, addr, ptep);
783 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
785 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
787 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
788 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
789 unsigned long address, pmd_t *pmdp,
790 pmd_t entry, int dirty);
792 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
793 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
794 unsigned long addr, pmd_t *pmdp);
796 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
797 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
798 unsigned long address, pmd_t *pmdp);
801 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
802 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
803 unsigned long addr, pmd_t *pmdp);
805 #define __HAVE_ARCH_PMD_WRITE
806 static inline int pmd_write(pmd_t pmd)
808 return pmd_flags(pmd) & _PAGE_RW;
811 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
812 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
815 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
816 pmd_update(mm, addr, pmdp);
820 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
821 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
822 unsigned long addr, pmd_t *pmdp)
824 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
825 pmd_update(mm, addr, pmdp);
829 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
831 * dst - pointer to pgd range anwhere on a pgd page
833 * count - the number of pgds to copy.
835 * dst and src can be on the same page, but the range must not overlap,
836 * and must not cross a page boundary.
838 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
840 memcpy(dst, src, count * sizeof(pgd_t));
843 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
844 static inline int page_level_shift(enum pg_level level)
846 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
848 static inline unsigned long page_level_size(enum pg_level level)
850 return 1UL << page_level_shift(level);
852 static inline unsigned long page_level_mask(enum pg_level level)
854 return ~(page_level_size(level) - 1);
858 * The x86 doesn't have any external MMU info: the kernel page
859 * tables contain all the necessary information.
861 static inline void update_mmu_cache(struct vm_area_struct *vma,
862 unsigned long addr, pte_t *ptep)
865 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
866 unsigned long addr, pmd_t *pmd)
870 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
872 VM_BUG_ON(pte_present(pte));
873 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
876 static inline int pte_swp_soft_dirty(pte_t pte)
878 VM_BUG_ON(pte_present(pte));
879 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
882 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
884 VM_BUG_ON(pte_present(pte));
885 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
888 #include <asm-generic/pgtable.h>
889 #endif /* __ASSEMBLY__ */
891 #endif /* _ASM_X86_PGTABLE_H */