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);
24 * ZERO_PAGE is a global shared page that is always zero: used
25 * for zero-mapped memory areas etc..
27 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
29 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
31 extern spinlock_t pgd_lock;
32 extern struct list_head pgd_list;
34 extern struct mm_struct *pgd_page_get_mm(struct page *page);
36 #ifdef CONFIG_PARAVIRT
37 #include <asm/paravirt.h>
38 #else /* !CONFIG_PARAVIRT */
39 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
40 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
41 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
43 #define set_pte_atomic(ptep, pte) \
44 native_set_pte_atomic(ptep, pte)
46 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
48 #ifndef __PAGETABLE_PUD_FOLDED
49 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
50 #define pgd_clear(pgd) native_pgd_clear(pgd)
54 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
57 #ifndef __PAGETABLE_PMD_FOLDED
58 #define pud_clear(pud) native_pud_clear(pud)
61 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
62 #define pmd_clear(pmd) native_pmd_clear(pmd)
64 #define pte_update(mm, addr, ptep) do { } while (0)
65 #define pte_update_defer(mm, addr, ptep) do { } while (0)
66 #define pmd_update(mm, addr, ptep) do { } while (0)
67 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
69 #define pgd_val(x) native_pgd_val(x)
70 #define __pgd(x) native_make_pgd(x)
72 #ifndef __PAGETABLE_PUD_FOLDED
73 #define pud_val(x) native_pud_val(x)
74 #define __pud(x) native_make_pud(x)
77 #ifndef __PAGETABLE_PMD_FOLDED
78 #define pmd_val(x) native_pmd_val(x)
79 #define __pmd(x) native_make_pmd(x)
82 #define pte_val(x) native_pte_val(x)
83 #define __pte(x) native_make_pte(x)
85 #define arch_end_context_switch(prev) do {} while(0)
87 #endif /* CONFIG_PARAVIRT */
90 * The following only work if pte_present() is true.
91 * Undefined behaviour if not..
93 static inline int pte_dirty(pte_t pte)
95 return pte_flags(pte) & _PAGE_DIRTY;
98 static inline int pte_young(pte_t pte)
100 return pte_flags(pte) & _PAGE_ACCESSED;
103 static inline int pmd_dirty(pmd_t pmd)
105 return pmd_flags(pmd) & _PAGE_DIRTY;
108 static inline int pmd_young(pmd_t pmd)
110 return pmd_flags(pmd) & _PAGE_ACCESSED;
113 static inline int pte_write(pte_t pte)
115 return pte_flags(pte) & _PAGE_RW;
118 static inline int pte_huge(pte_t pte)
120 return pte_flags(pte) & _PAGE_PSE;
123 static inline int pte_global(pte_t pte)
125 return pte_flags(pte) & _PAGE_GLOBAL;
128 static inline int pte_exec(pte_t pte)
130 return !(pte_flags(pte) & _PAGE_NX);
133 static inline int pte_special(pte_t pte)
135 return pte_flags(pte) & _PAGE_SPECIAL;
138 static inline unsigned long pte_pfn(pte_t pte)
140 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
143 static inline unsigned long pmd_pfn(pmd_t pmd)
145 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
148 static inline unsigned long pud_pfn(pud_t pud)
150 return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
153 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
155 static inline int pmd_large(pmd_t pte)
157 return pmd_flags(pte) & _PAGE_PSE;
160 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
161 static inline int pmd_trans_splitting(pmd_t pmd)
163 return pmd_val(pmd) & _PAGE_SPLITTING;
166 static inline int pmd_trans_huge(pmd_t pmd)
168 return pmd_val(pmd) & _PAGE_PSE;
171 static inline int has_transparent_hugepage(void)
175 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
177 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
179 pteval_t v = native_pte_val(pte);
181 return native_make_pte(v | set);
184 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
186 pteval_t v = native_pte_val(pte);
188 return native_make_pte(v & ~clear);
191 static inline pte_t pte_mkclean(pte_t pte)
193 return pte_clear_flags(pte, _PAGE_DIRTY);
196 static inline pte_t pte_mkold(pte_t pte)
198 return pte_clear_flags(pte, _PAGE_ACCESSED);
201 static inline pte_t pte_wrprotect(pte_t pte)
203 return pte_clear_flags(pte, _PAGE_RW);
206 static inline pte_t pte_mkexec(pte_t pte)
208 return pte_clear_flags(pte, _PAGE_NX);
211 static inline pte_t pte_mkdirty(pte_t pte)
213 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
216 static inline pte_t pte_mkyoung(pte_t pte)
218 return pte_set_flags(pte, _PAGE_ACCESSED);
221 static inline pte_t pte_mkwrite(pte_t pte)
223 return pte_set_flags(pte, _PAGE_RW);
226 static inline pte_t pte_mkhuge(pte_t pte)
228 return pte_set_flags(pte, _PAGE_PSE);
231 static inline pte_t pte_clrhuge(pte_t pte)
233 return pte_clear_flags(pte, _PAGE_PSE);
236 static inline pte_t pte_mkglobal(pte_t pte)
238 return pte_set_flags(pte, _PAGE_GLOBAL);
241 static inline pte_t pte_clrglobal(pte_t pte)
243 return pte_clear_flags(pte, _PAGE_GLOBAL);
246 static inline pte_t pte_mkspecial(pte_t pte)
248 return pte_set_flags(pte, _PAGE_SPECIAL);
251 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
253 pmdval_t v = native_pmd_val(pmd);
255 return __pmd(v | set);
258 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
260 pmdval_t v = native_pmd_val(pmd);
262 return __pmd(v & ~clear);
265 static inline pmd_t pmd_mkold(pmd_t pmd)
267 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
270 static inline pmd_t pmd_wrprotect(pmd_t pmd)
272 return pmd_clear_flags(pmd, _PAGE_RW);
275 static inline pmd_t pmd_mkdirty(pmd_t pmd)
277 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
280 static inline pmd_t pmd_mkhuge(pmd_t pmd)
282 return pmd_set_flags(pmd, _PAGE_PSE);
285 static inline pmd_t pmd_mkyoung(pmd_t pmd)
287 return pmd_set_flags(pmd, _PAGE_ACCESSED);
290 static inline pmd_t pmd_mkwrite(pmd_t pmd)
292 return pmd_set_flags(pmd, _PAGE_RW);
295 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
297 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
300 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
301 static inline int pte_soft_dirty(pte_t pte)
303 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
306 static inline int pmd_soft_dirty(pmd_t pmd)
308 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
311 static inline pte_t pte_mksoft_dirty(pte_t pte)
313 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
316 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
318 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
321 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
324 * Mask out unsupported bits in a present pgprot. Non-present pgprots
325 * can use those bits for other purposes, so leave them be.
327 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
329 pgprotval_t protval = pgprot_val(pgprot);
331 if (protval & _PAGE_PRESENT)
332 protval &= __supported_pte_mask;
337 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
339 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
340 massage_pgprot(pgprot));
343 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
345 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
346 massage_pgprot(pgprot));
349 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
351 pteval_t val = pte_val(pte);
354 * Chop off the NX bit (if present), and add the NX portion of
355 * the newprot (if present):
357 val &= _PAGE_CHG_MASK;
358 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
363 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
365 pmdval_t val = pmd_val(pmd);
367 val &= _HPAGE_CHG_MASK;
368 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
373 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
374 #define pgprot_modify pgprot_modify
375 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
377 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
378 pgprotval_t addbits = pgprot_val(newprot);
379 return __pgprot(preservebits | addbits);
382 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
384 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
386 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
387 enum page_cache_mode pcm,
388 enum page_cache_mode new_pcm)
391 * PAT type is always WB for untracked ranges, so no need to check.
393 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
397 * Certain new memtypes are not allowed with certain
399 * - request is uncached, return cannot be write-back
400 * - request is write-combine, return cannot be write-back
402 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
403 new_pcm == _PAGE_CACHE_MODE_WB) ||
404 (pcm == _PAGE_CACHE_MODE_WC &&
405 new_pcm == _PAGE_CACHE_MODE_WB)) {
412 pmd_t *populate_extra_pmd(unsigned long vaddr);
413 pte_t *populate_extra_pte(unsigned long vaddr);
414 #endif /* __ASSEMBLY__ */
417 # include <asm/pgtable_32.h>
419 # include <asm/pgtable_64.h>
423 #include <linux/mm_types.h>
424 #include <linux/mmdebug.h>
425 #include <linux/log2.h>
427 static inline int pte_none(pte_t pte)
432 #define __HAVE_ARCH_PTE_SAME
433 static inline int pte_same(pte_t a, pte_t b)
435 return a.pte == b.pte;
438 static inline int pte_present(pte_t a)
440 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
443 #define pte_accessible pte_accessible
444 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
446 if (pte_flags(a) & _PAGE_PRESENT)
449 if ((pte_flags(a) & _PAGE_PROTNONE) &&
450 mm_tlb_flush_pending(mm))
456 static inline int pte_hidden(pte_t pte)
458 return pte_flags(pte) & _PAGE_HIDDEN;
461 static inline int pmd_present(pmd_t pmd)
464 * Checking for _PAGE_PSE is needed too because
465 * split_huge_page will temporarily clear the present bit (but
466 * the _PAGE_PSE flag will remain set at all times while the
467 * _PAGE_PRESENT bit is clear).
469 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
472 #ifdef CONFIG_NUMA_BALANCING
474 * These work without NUMA balancing but the kernel does not care. See the
475 * comment in include/asm-generic/pgtable.h
477 static inline int pte_protnone(pte_t pte)
479 return pte_flags(pte) & _PAGE_PROTNONE;
482 static inline int pmd_protnone(pmd_t pmd)
484 return pmd_flags(pmd) & _PAGE_PROTNONE;
486 #endif /* CONFIG_NUMA_BALANCING */
488 static inline int pmd_none(pmd_t pmd)
490 /* Only check low word on 32-bit platforms, since it might be
491 out of sync with upper half. */
492 return (unsigned long)native_pmd_val(pmd) == 0;
495 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
497 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
501 * Currently stuck as a macro due to indirect forward reference to
502 * linux/mmzone.h's __section_mem_map_addr() definition:
504 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
507 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
509 * this macro returns the index of the entry in the pmd page which would
510 * control the given virtual address
512 static inline unsigned long pmd_index(unsigned long address)
514 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
518 * Conversion functions: convert a page and protection to a page entry,
519 * and a page entry and page directory to the page they refer to.
521 * (Currently stuck as a macro because of indirect forward reference
522 * to linux/mm.h:page_to_nid())
524 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
527 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
529 * this function returns the index of the entry in the pte page which would
530 * control the given virtual address
532 static inline unsigned long pte_index(unsigned long address)
534 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
537 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
539 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
542 static inline int pmd_bad(pmd_t pmd)
544 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
547 static inline unsigned long pages_to_mb(unsigned long npg)
549 return npg >> (20 - PAGE_SHIFT);
552 #if PAGETABLE_LEVELS > 2
553 static inline int pud_none(pud_t pud)
555 return native_pud_val(pud) == 0;
558 static inline int pud_present(pud_t pud)
560 return pud_flags(pud) & _PAGE_PRESENT;
563 static inline unsigned long pud_page_vaddr(pud_t pud)
565 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
569 * Currently stuck as a macro due to indirect forward reference to
570 * linux/mmzone.h's __section_mem_map_addr() definition:
572 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
574 /* Find an entry in the second-level page table.. */
575 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
577 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
580 static inline int pud_large(pud_t pud)
582 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
583 (_PAGE_PSE | _PAGE_PRESENT);
586 static inline int pud_bad(pud_t pud)
588 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
591 static inline int pud_large(pud_t pud)
595 #endif /* PAGETABLE_LEVELS > 2 */
597 #if PAGETABLE_LEVELS > 3
598 static inline int pgd_present(pgd_t pgd)
600 return pgd_flags(pgd) & _PAGE_PRESENT;
603 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
605 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
609 * Currently stuck as a macro due to indirect forward reference to
610 * linux/mmzone.h's __section_mem_map_addr() definition:
612 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
614 /* to find an entry in a page-table-directory. */
615 static inline unsigned long pud_index(unsigned long address)
617 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
620 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
622 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
625 static inline int pgd_bad(pgd_t pgd)
627 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
630 static inline int pgd_none(pgd_t pgd)
632 return !native_pgd_val(pgd);
634 #endif /* PAGETABLE_LEVELS > 3 */
636 #endif /* __ASSEMBLY__ */
639 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
641 * this macro returns the index of the entry in the pgd page which would
642 * control the given virtual address
644 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
647 * pgd_offset() returns a (pgd_t *)
648 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
650 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
652 * a shortcut which implies the use of the kernel's pgd, instead
655 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
658 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
659 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
663 extern int direct_gbpages;
664 void init_mem_mapping(void);
665 void early_alloc_pgt_buf(void);
667 /* local pte updates need not use xchg for locking */
668 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
672 /* Pure native function needs no input for mm, addr */
673 native_pte_clear(NULL, 0, ptep);
677 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
681 native_pmd_clear(pmdp);
685 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
686 pte_t *ptep , pte_t pte)
688 native_set_pte(ptep, pte);
691 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
692 pmd_t *pmdp , pmd_t pmd)
694 native_set_pmd(pmdp, pmd);
697 #ifndef CONFIG_PARAVIRT
699 * Rules for using pte_update - it must be called after any PTE update which
700 * has not been done using the set_pte / clear_pte interfaces. It is used by
701 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
702 * updates should either be sets, clears, or set_pte_atomic for P->P
703 * transitions, which means this hook should only be called for user PTEs.
704 * This hook implies a P->P protection or access change has taken place, which
705 * requires a subsequent TLB flush. The notification can optionally be delayed
706 * until the TLB flush event by using the pte_update_defer form of the
707 * interface, but care must be taken to assure that the flush happens while
708 * still holding the same page table lock so that the shadow and primary pages
709 * do not become out of sync on SMP.
711 #define pte_update(mm, addr, ptep) do { } while (0)
712 #define pte_update_defer(mm, addr, ptep) do { } while (0)
716 * We only update the dirty/accessed state if we set
717 * the dirty bit by hand in the kernel, since the hardware
718 * will do the accessed bit for us, and we don't want to
719 * race with other CPU's that might be updating the dirty
720 * bit at the same time.
722 struct vm_area_struct;
724 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
725 extern int ptep_set_access_flags(struct vm_area_struct *vma,
726 unsigned long address, pte_t *ptep,
727 pte_t entry, int dirty);
729 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
730 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
731 unsigned long addr, pte_t *ptep);
733 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
734 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
735 unsigned long address, pte_t *ptep);
737 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
738 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
741 pte_t pte = native_ptep_get_and_clear(ptep);
742 pte_update(mm, addr, ptep);
746 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
747 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
748 unsigned long addr, pte_t *ptep,
754 * Full address destruction in progress; paravirt does not
755 * care about updates and native needs no locking
757 pte = native_local_ptep_get_and_clear(ptep);
759 pte = ptep_get_and_clear(mm, addr, ptep);
764 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
765 static inline void ptep_set_wrprotect(struct mm_struct *mm,
766 unsigned long addr, pte_t *ptep)
768 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
769 pte_update(mm, addr, ptep);
772 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
774 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
776 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
777 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
778 unsigned long address, pmd_t *pmdp,
779 pmd_t entry, int dirty);
781 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
782 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
783 unsigned long addr, pmd_t *pmdp);
785 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
786 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
787 unsigned long address, pmd_t *pmdp);
790 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
791 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
792 unsigned long addr, pmd_t *pmdp);
794 #define __HAVE_ARCH_PMD_WRITE
795 static inline int pmd_write(pmd_t pmd)
797 return pmd_flags(pmd) & _PAGE_RW;
800 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
801 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
804 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
805 pmd_update(mm, addr, pmdp);
809 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
810 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
811 unsigned long addr, pmd_t *pmdp)
813 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
814 pmd_update(mm, addr, pmdp);
818 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
820 * dst - pointer to pgd range anwhere on a pgd page
822 * count - the number of pgds to copy.
824 * dst and src can be on the same page, but the range must not overlap,
825 * and must not cross a page boundary.
827 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
829 memcpy(dst, src, count * sizeof(pgd_t));
832 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
833 static inline int page_level_shift(enum pg_level level)
835 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
837 static inline unsigned long page_level_size(enum pg_level level)
839 return 1UL << page_level_shift(level);
841 static inline unsigned long page_level_mask(enum pg_level level)
843 return ~(page_level_size(level) - 1);
847 * The x86 doesn't have any external MMU info: the kernel page
848 * tables contain all the necessary information.
850 static inline void update_mmu_cache(struct vm_area_struct *vma,
851 unsigned long addr, pte_t *ptep)
854 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
855 unsigned long addr, pmd_t *pmd)
859 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
860 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
862 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
865 static inline int pte_swp_soft_dirty(pte_t pte)
867 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
870 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
872 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
876 #include <asm-generic/pgtable.h>
877 #endif /* __ASSEMBLY__ */
879 #endif /* _ASM_X86_PGTABLE_H */