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)) \
18 #include <asm/x86_init.h>
20 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
23 * ZERO_PAGE is a global shared page that is always zero: used
24 * for zero-mapped memory areas etc..
26 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
28 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
30 extern spinlock_t pgd_lock;
31 extern struct list_head pgd_list;
33 extern struct mm_struct *pgd_page_get_mm(struct page *page);
35 #ifdef CONFIG_PARAVIRT
36 #include <asm/paravirt.h>
37 #else /* !CONFIG_PARAVIRT */
38 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
39 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
40 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
42 #define set_pte_atomic(ptep, pte) \
43 native_set_pte_atomic(ptep, pte)
45 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
47 #ifndef __PAGETABLE_PUD_FOLDED
48 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
49 #define pgd_clear(pgd) native_pgd_clear(pgd)
53 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
56 #ifndef __PAGETABLE_PMD_FOLDED
57 #define pud_clear(pud) native_pud_clear(pud)
60 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
61 #define pmd_clear(pmd) native_pmd_clear(pmd)
63 #define pte_update(mm, addr, ptep) do { } while (0)
64 #define pte_update_defer(mm, addr, ptep) do { } while (0)
65 #define pmd_update(mm, addr, ptep) do { } while (0)
66 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
68 #define pgd_val(x) native_pgd_val(x)
69 #define __pgd(x) native_make_pgd(x)
71 #ifndef __PAGETABLE_PUD_FOLDED
72 #define pud_val(x) native_pud_val(x)
73 #define __pud(x) native_make_pud(x)
76 #ifndef __PAGETABLE_PMD_FOLDED
77 #define pmd_val(x) native_pmd_val(x)
78 #define __pmd(x) native_make_pmd(x)
81 #define pte_val(x) native_pte_val(x)
82 #define __pte(x) native_make_pte(x)
84 #define arch_end_context_switch(prev) do {} while(0)
86 #endif /* CONFIG_PARAVIRT */
89 * The following only work if pte_present() is true.
90 * Undefined behaviour if not..
92 static inline int pte_dirty(pte_t pte)
94 return pte_flags(pte) & _PAGE_DIRTY;
97 static inline int pte_young(pte_t pte)
99 return pte_flags(pte) & _PAGE_ACCESSED;
102 static inline int pmd_young(pmd_t pmd)
104 return pmd_flags(pmd) & _PAGE_ACCESSED;
107 static inline int pte_write(pte_t pte)
109 return pte_flags(pte) & _PAGE_RW;
112 static inline int pte_file(pte_t pte)
114 return pte_flags(pte) & _PAGE_FILE;
117 static inline int pte_huge(pte_t pte)
119 return pte_flags(pte) & _PAGE_PSE;
122 static inline int pte_global(pte_t pte)
124 return pte_flags(pte) & _PAGE_GLOBAL;
127 static inline int pte_exec(pte_t pte)
129 return !(pte_flags(pte) & _PAGE_NX);
132 static inline int pte_special(pte_t pte)
135 * See CONFIG_NUMA_BALANCING pte_numa in include/asm-generic/pgtable.h.
136 * On x86 we have _PAGE_BIT_NUMA == _PAGE_BIT_GLOBAL+1 ==
137 * __PAGE_BIT_SOFTW1 == _PAGE_BIT_SPECIAL.
139 return (pte_flags(pte) & _PAGE_SPECIAL) &&
140 (pte_flags(pte) & (_PAGE_PRESENT|_PAGE_PROTNONE));
143 static inline unsigned long pte_pfn(pte_t pte)
145 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
148 static inline unsigned long pmd_pfn(pmd_t pmd)
150 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
153 static inline unsigned long pud_pfn(pud_t pud)
155 return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
158 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
160 static inline int pmd_large(pmd_t pte)
162 return pmd_flags(pte) & _PAGE_PSE;
165 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
166 static inline int pmd_trans_splitting(pmd_t pmd)
168 return pmd_val(pmd) & _PAGE_SPLITTING;
171 static inline int pmd_trans_huge(pmd_t pmd)
173 return pmd_val(pmd) & _PAGE_PSE;
176 static inline int has_transparent_hugepage(void)
180 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
182 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
184 pteval_t v = native_pte_val(pte);
186 return native_make_pte(v | set);
189 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
191 pteval_t v = native_pte_val(pte);
193 return native_make_pte(v & ~clear);
196 static inline pte_t pte_mkclean(pte_t pte)
198 return pte_clear_flags(pte, _PAGE_DIRTY);
201 static inline pte_t pte_mkold(pte_t pte)
203 return pte_clear_flags(pte, _PAGE_ACCESSED);
206 static inline pte_t pte_wrprotect(pte_t pte)
208 return pte_clear_flags(pte, _PAGE_RW);
211 static inline pte_t pte_mkexec(pte_t pte)
213 return pte_clear_flags(pte, _PAGE_NX);
216 static inline pte_t pte_mkdirty(pte_t pte)
218 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
221 static inline pte_t pte_mkyoung(pte_t pte)
223 return pte_set_flags(pte, _PAGE_ACCESSED);
226 static inline pte_t pte_mkwrite(pte_t pte)
228 return pte_set_flags(pte, _PAGE_RW);
231 static inline pte_t pte_mkhuge(pte_t pte)
233 return pte_set_flags(pte, _PAGE_PSE);
236 static inline pte_t pte_clrhuge(pte_t pte)
238 return pte_clear_flags(pte, _PAGE_PSE);
241 static inline pte_t pte_mkglobal(pte_t pte)
243 return pte_set_flags(pte, _PAGE_GLOBAL);
246 static inline pte_t pte_clrglobal(pte_t pte)
248 return pte_clear_flags(pte, _PAGE_GLOBAL);
251 static inline pte_t pte_mkspecial(pte_t pte)
253 return pte_set_flags(pte, _PAGE_SPECIAL);
256 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
258 pmdval_t v = native_pmd_val(pmd);
260 return __pmd(v | set);
263 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
265 pmdval_t v = native_pmd_val(pmd);
267 return __pmd(v & ~clear);
270 static inline pmd_t pmd_mkold(pmd_t pmd)
272 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
275 static inline pmd_t pmd_wrprotect(pmd_t pmd)
277 return pmd_clear_flags(pmd, _PAGE_RW);
280 static inline pmd_t pmd_mkdirty(pmd_t pmd)
282 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
285 static inline pmd_t pmd_mkhuge(pmd_t pmd)
287 return pmd_set_flags(pmd, _PAGE_PSE);
290 static inline pmd_t pmd_mkyoung(pmd_t pmd)
292 return pmd_set_flags(pmd, _PAGE_ACCESSED);
295 static inline pmd_t pmd_mkwrite(pmd_t pmd)
297 return pmd_set_flags(pmd, _PAGE_RW);
300 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
302 return pmd_clear_flags(pmd, _PAGE_PRESENT);
305 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
306 static inline int pte_soft_dirty(pte_t pte)
308 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
311 static inline int pmd_soft_dirty(pmd_t pmd)
313 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
316 static inline pte_t pte_mksoft_dirty(pte_t pte)
318 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
321 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
323 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
326 static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
328 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
331 static inline pte_t pte_file_mksoft_dirty(pte_t pte)
333 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
336 static inline int pte_file_soft_dirty(pte_t pte)
338 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
341 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
344 * Mask out unsupported bits in a present pgprot. Non-present pgprots
345 * can use those bits for other purposes, so leave them be.
347 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
349 pgprotval_t protval = pgprot_val(pgprot);
351 if (protval & _PAGE_PRESENT)
352 protval &= __supported_pte_mask;
357 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
359 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
360 massage_pgprot(pgprot));
363 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
365 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
366 massage_pgprot(pgprot));
369 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
371 pteval_t val = pte_val(pte);
374 * Chop off the NX bit (if present), and add the NX portion of
375 * the newprot (if present):
377 val &= _PAGE_CHG_MASK;
378 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
383 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
385 pmdval_t val = pmd_val(pmd);
387 val &= _HPAGE_CHG_MASK;
388 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
393 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
394 #define pgprot_modify pgprot_modify
395 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
397 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
398 pgprotval_t addbits = pgprot_val(newprot);
399 return __pgprot(preservebits | addbits);
402 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
404 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
406 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
408 unsigned long new_flags)
411 * PAT type is always WB for untracked ranges, so no need to check.
413 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
417 * Certain new memtypes are not allowed with certain
419 * - request is uncached, return cannot be write-back
420 * - request is write-combine, return cannot be write-back
422 if ((flags == _PAGE_CACHE_UC_MINUS &&
423 new_flags == _PAGE_CACHE_WB) ||
424 (flags == _PAGE_CACHE_WC &&
425 new_flags == _PAGE_CACHE_WB)) {
432 pmd_t *populate_extra_pmd(unsigned long vaddr);
433 pte_t *populate_extra_pte(unsigned long vaddr);
434 #endif /* __ASSEMBLY__ */
437 # include <asm/pgtable_32.h>
439 # include <asm/pgtable_64.h>
443 #include <linux/mm_types.h>
444 #include <linux/mmdebug.h>
445 #include <linux/log2.h>
447 static inline int pte_none(pte_t pte)
452 #define __HAVE_ARCH_PTE_SAME
453 static inline int pte_same(pte_t a, pte_t b)
455 return a.pte == b.pte;
458 static inline int pte_present(pte_t a)
460 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE |
464 #define pte_present_nonuma pte_present_nonuma
465 static inline int pte_present_nonuma(pte_t a)
467 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
470 #define pte_accessible pte_accessible
471 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
473 if (pte_flags(a) & _PAGE_PRESENT)
476 if ((pte_flags(a) & (_PAGE_PROTNONE | _PAGE_NUMA)) &&
477 mm_tlb_flush_pending(mm))
483 static inline int pte_hidden(pte_t pte)
485 return pte_flags(pte) & _PAGE_HIDDEN;
488 static inline int pmd_present(pmd_t pmd)
491 * Checking for _PAGE_PSE is needed too because
492 * split_huge_page will temporarily clear the present bit (but
493 * the _PAGE_PSE flag will remain set at all times while the
494 * _PAGE_PRESENT bit is clear).
496 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
500 static inline int pmd_none(pmd_t pmd)
502 /* Only check low word on 32-bit platforms, since it might be
503 out of sync with upper half. */
504 return (unsigned long)native_pmd_val(pmd) == 0;
507 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
509 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
513 * Currently stuck as a macro due to indirect forward reference to
514 * linux/mmzone.h's __section_mem_map_addr() definition:
516 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
519 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
521 * this macro returns the index of the entry in the pmd page which would
522 * control the given virtual address
524 static inline unsigned long pmd_index(unsigned long address)
526 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
530 * Conversion functions: convert a page and protection to a page entry,
531 * and a page entry and page directory to the page they refer to.
533 * (Currently stuck as a macro because of indirect forward reference
534 * to linux/mm.h:page_to_nid())
536 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
539 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
541 * this function returns the index of the entry in the pte page which would
542 * control the given virtual address
544 static inline unsigned long pte_index(unsigned long address)
546 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
549 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
551 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
554 static inline int pmd_bad(pmd_t pmd)
556 #ifdef CONFIG_NUMA_BALANCING
558 if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
561 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
564 static inline unsigned long pages_to_mb(unsigned long npg)
566 return npg >> (20 - PAGE_SHIFT);
569 #if PAGETABLE_LEVELS > 2
570 static inline int pud_none(pud_t pud)
572 return native_pud_val(pud) == 0;
575 static inline int pud_present(pud_t pud)
577 return pud_flags(pud) & _PAGE_PRESENT;
580 static inline unsigned long pud_page_vaddr(pud_t pud)
582 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
586 * Currently stuck as a macro due to indirect forward reference to
587 * linux/mmzone.h's __section_mem_map_addr() definition:
589 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
591 /* Find an entry in the second-level page table.. */
592 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
594 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
597 static inline int pud_large(pud_t pud)
599 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
600 (_PAGE_PSE | _PAGE_PRESENT);
603 static inline int pud_bad(pud_t pud)
605 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
608 static inline int pud_large(pud_t pud)
612 #endif /* PAGETABLE_LEVELS > 2 */
614 #if PAGETABLE_LEVELS > 3
615 static inline int pgd_present(pgd_t pgd)
617 return pgd_flags(pgd) & _PAGE_PRESENT;
620 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
622 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
626 * Currently stuck as a macro due to indirect forward reference to
627 * linux/mmzone.h's __section_mem_map_addr() definition:
629 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
631 /* to find an entry in a page-table-directory. */
632 static inline unsigned long pud_index(unsigned long address)
634 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
637 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
639 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
642 static inline int pgd_bad(pgd_t pgd)
644 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
647 static inline int pgd_none(pgd_t pgd)
649 return !native_pgd_val(pgd);
651 #endif /* PAGETABLE_LEVELS > 3 */
653 #endif /* __ASSEMBLY__ */
656 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
658 * this macro returns the index of the entry in the pgd page which would
659 * control the given virtual address
661 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
664 * pgd_offset() returns a (pgd_t *)
665 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
667 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
669 * a shortcut which implies the use of the kernel's pgd, instead
672 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
675 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
676 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
680 extern int direct_gbpages;
681 void init_mem_mapping(void);
682 void early_alloc_pgt_buf(void);
684 /* local pte updates need not use xchg for locking */
685 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
689 /* Pure native function needs no input for mm, addr */
690 native_pte_clear(NULL, 0, ptep);
694 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
698 native_pmd_clear(pmdp);
702 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
703 pte_t *ptep , pte_t pte)
705 native_set_pte(ptep, pte);
708 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
709 pmd_t *pmdp , pmd_t pmd)
711 native_set_pmd(pmdp, pmd);
714 #ifndef CONFIG_PARAVIRT
716 * Rules for using pte_update - it must be called after any PTE update which
717 * has not been done using the set_pte / clear_pte interfaces. It is used by
718 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
719 * updates should either be sets, clears, or set_pte_atomic for P->P
720 * transitions, which means this hook should only be called for user PTEs.
721 * This hook implies a P->P protection or access change has taken place, which
722 * requires a subsequent TLB flush. The notification can optionally be delayed
723 * until the TLB flush event by using the pte_update_defer form of the
724 * interface, but care must be taken to assure that the flush happens while
725 * still holding the same page table lock so that the shadow and primary pages
726 * do not become out of sync on SMP.
728 #define pte_update(mm, addr, ptep) do { } while (0)
729 #define pte_update_defer(mm, addr, ptep) do { } while (0)
733 * We only update the dirty/accessed state if we set
734 * the dirty bit by hand in the kernel, since the hardware
735 * will do the accessed bit for us, and we don't want to
736 * race with other CPU's that might be updating the dirty
737 * bit at the same time.
739 struct vm_area_struct;
741 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
742 extern int ptep_set_access_flags(struct vm_area_struct *vma,
743 unsigned long address, pte_t *ptep,
744 pte_t entry, int dirty);
746 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
747 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
748 unsigned long addr, pte_t *ptep);
750 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
751 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
752 unsigned long address, pte_t *ptep);
754 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
755 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
758 pte_t pte = native_ptep_get_and_clear(ptep);
759 pte_update(mm, addr, ptep);
763 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
764 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
765 unsigned long addr, pte_t *ptep,
771 * Full address destruction in progress; paravirt does not
772 * care about updates and native needs no locking
774 pte = native_local_ptep_get_and_clear(ptep);
776 pte = ptep_get_and_clear(mm, addr, ptep);
781 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
782 static inline void ptep_set_wrprotect(struct mm_struct *mm,
783 unsigned long addr, pte_t *ptep)
785 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
786 pte_update(mm, addr, ptep);
789 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
791 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
793 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
794 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
795 unsigned long address, pmd_t *pmdp,
796 pmd_t entry, int dirty);
798 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
799 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
800 unsigned long addr, pmd_t *pmdp);
802 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
803 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
804 unsigned long address, pmd_t *pmdp);
807 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
808 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
809 unsigned long addr, pmd_t *pmdp);
811 #define __HAVE_ARCH_PMD_WRITE
812 static inline int pmd_write(pmd_t pmd)
814 return pmd_flags(pmd) & _PAGE_RW;
817 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
818 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
821 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
822 pmd_update(mm, addr, pmdp);
826 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
827 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
828 unsigned long addr, pmd_t *pmdp)
830 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
831 pmd_update(mm, addr, pmdp);
835 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
837 * dst - pointer to pgd range anwhere on a pgd page
839 * count - the number of pgds to copy.
841 * dst and src can be on the same page, but the range must not overlap,
842 * and must not cross a page boundary.
844 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
846 memcpy(dst, src, count * sizeof(pgd_t));
849 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
850 static inline int page_level_shift(enum pg_level level)
852 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
854 static inline unsigned long page_level_size(enum pg_level level)
856 return 1UL << page_level_shift(level);
858 static inline unsigned long page_level_mask(enum pg_level level)
860 return ~(page_level_size(level) - 1);
864 * The x86 doesn't have any external MMU info: the kernel page
865 * tables contain all the necessary information.
867 static inline void update_mmu_cache(struct vm_area_struct *vma,
868 unsigned long addr, pte_t *ptep)
871 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
872 unsigned long addr, pmd_t *pmd)
876 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
877 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
879 VM_BUG_ON(pte_present_nonuma(pte));
880 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
883 static inline int pte_swp_soft_dirty(pte_t pte)
885 VM_BUG_ON(pte_present_nonuma(pte));
886 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
889 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
891 VM_BUG_ON(pte_present_nonuma(pte));
892 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
896 #include <asm-generic/pgtable.h>
897 #endif /* __ASSEMBLY__ */
899 #endif /* _ASM_X86_PGTABLE_H */