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_splitting(pmd_t pmd)
167 return pmd_val(pmd) & _PAGE_SPLITTING;
170 static inline int pmd_trans_huge(pmd_t pmd)
172 return pmd_val(pmd) & _PAGE_PSE;
175 static inline int has_transparent_hugepage(void)
179 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
181 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
183 pteval_t v = native_pte_val(pte);
185 return native_make_pte(v | set);
188 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
190 pteval_t v = native_pte_val(pte);
192 return native_make_pte(v & ~clear);
195 static inline pte_t pte_mkclean(pte_t pte)
197 return pte_clear_flags(pte, _PAGE_DIRTY);
200 static inline pte_t pte_mkold(pte_t pte)
202 return pte_clear_flags(pte, _PAGE_ACCESSED);
205 static inline pte_t pte_wrprotect(pte_t pte)
207 return pte_clear_flags(pte, _PAGE_RW);
210 static inline pte_t pte_mkexec(pte_t pte)
212 return pte_clear_flags(pte, _PAGE_NX);
215 static inline pte_t pte_mkdirty(pte_t pte)
217 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
220 static inline pte_t pte_mkyoung(pte_t pte)
222 return pte_set_flags(pte, _PAGE_ACCESSED);
225 static inline pte_t pte_mkwrite(pte_t pte)
227 return pte_set_flags(pte, _PAGE_RW);
230 static inline pte_t pte_mkhuge(pte_t pte)
232 return pte_set_flags(pte, _PAGE_PSE);
235 static inline pte_t pte_clrhuge(pte_t pte)
237 return pte_clear_flags(pte, _PAGE_PSE);
240 static inline pte_t pte_mkglobal(pte_t pte)
242 return pte_set_flags(pte, _PAGE_GLOBAL);
245 static inline pte_t pte_clrglobal(pte_t pte)
247 return pte_clear_flags(pte, _PAGE_GLOBAL);
250 static inline pte_t pte_mkspecial(pte_t pte)
252 return pte_set_flags(pte, _PAGE_SPECIAL);
255 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
257 pmdval_t v = native_pmd_val(pmd);
259 return __pmd(v | set);
262 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
264 pmdval_t v = native_pmd_val(pmd);
266 return __pmd(v & ~clear);
269 static inline pmd_t pmd_mkold(pmd_t pmd)
271 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
274 static inline pmd_t pmd_wrprotect(pmd_t pmd)
276 return pmd_clear_flags(pmd, _PAGE_RW);
279 static inline pmd_t pmd_mkdirty(pmd_t pmd)
281 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
284 static inline pmd_t pmd_mkhuge(pmd_t pmd)
286 return pmd_set_flags(pmd, _PAGE_PSE);
289 static inline pmd_t pmd_mkyoung(pmd_t pmd)
291 return pmd_set_flags(pmd, _PAGE_ACCESSED);
294 static inline pmd_t pmd_mkwrite(pmd_t pmd)
296 return pmd_set_flags(pmd, _PAGE_RW);
299 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
301 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
304 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
305 static inline int pte_soft_dirty(pte_t pte)
307 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
310 static inline int pmd_soft_dirty(pmd_t pmd)
312 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
315 static inline pte_t pte_mksoft_dirty(pte_t pte)
317 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
320 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
322 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
325 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
328 * Mask out unsupported bits in a present pgprot. Non-present pgprots
329 * can use those bits for other purposes, so leave them be.
331 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
333 pgprotval_t protval = pgprot_val(pgprot);
335 if (protval & _PAGE_PRESENT)
336 protval &= __supported_pte_mask;
341 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
343 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
344 massage_pgprot(pgprot));
347 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
349 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
350 massage_pgprot(pgprot));
353 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
355 pteval_t val = pte_val(pte);
358 * Chop off the NX bit (if present), and add the NX portion of
359 * the newprot (if present):
361 val &= _PAGE_CHG_MASK;
362 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
367 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
369 pmdval_t val = pmd_val(pmd);
371 val &= _HPAGE_CHG_MASK;
372 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
377 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
378 #define pgprot_modify pgprot_modify
379 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
381 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
382 pgprotval_t addbits = pgprot_val(newprot);
383 return __pgprot(preservebits | addbits);
386 #define pte_pgprot(x) __pgprot(pte_flags(x))
387 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
388 #define pud_pgprot(x) __pgprot(pud_flags(x))
390 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
392 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
393 enum page_cache_mode pcm,
394 enum page_cache_mode new_pcm)
397 * PAT type is always WB for untracked ranges, so no need to check.
399 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
403 * Certain new memtypes are not allowed with certain
405 * - request is uncached, return cannot be write-back
406 * - request is write-combine, return cannot be write-back
407 * - request is write-through, return cannot be write-back
408 * - request is write-through, return cannot be write-combine
410 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
411 new_pcm == _PAGE_CACHE_MODE_WB) ||
412 (pcm == _PAGE_CACHE_MODE_WC &&
413 new_pcm == _PAGE_CACHE_MODE_WB) ||
414 (pcm == _PAGE_CACHE_MODE_WT &&
415 new_pcm == _PAGE_CACHE_MODE_WB) ||
416 (pcm == _PAGE_CACHE_MODE_WT &&
417 new_pcm == _PAGE_CACHE_MODE_WC)) {
424 pmd_t *populate_extra_pmd(unsigned long vaddr);
425 pte_t *populate_extra_pte(unsigned long vaddr);
426 #endif /* __ASSEMBLY__ */
429 # include <asm/pgtable_32.h>
431 # include <asm/pgtable_64.h>
435 #include <linux/mm_types.h>
436 #include <linux/mmdebug.h>
437 #include <linux/log2.h>
439 static inline int pte_none(pte_t pte)
444 #define __HAVE_ARCH_PTE_SAME
445 static inline int pte_same(pte_t a, pte_t b)
447 return a.pte == b.pte;
450 static inline int pte_present(pte_t a)
452 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
455 #define pte_accessible pte_accessible
456 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
458 if (pte_flags(a) & _PAGE_PRESENT)
461 if ((pte_flags(a) & _PAGE_PROTNONE) &&
462 mm_tlb_flush_pending(mm))
468 static inline int pte_hidden(pte_t pte)
470 return pte_flags(pte) & _PAGE_HIDDEN;
473 static inline int pmd_present(pmd_t pmd)
476 * Checking for _PAGE_PSE is needed too because
477 * split_huge_page will temporarily clear the present bit (but
478 * the _PAGE_PSE flag will remain set at all times while the
479 * _PAGE_PRESENT bit is clear).
481 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
484 #ifdef CONFIG_NUMA_BALANCING
486 * These work without NUMA balancing but the kernel does not care. See the
487 * comment in include/asm-generic/pgtable.h
489 static inline int pte_protnone(pte_t pte)
491 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
495 static inline int pmd_protnone(pmd_t pmd)
497 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
500 #endif /* CONFIG_NUMA_BALANCING */
502 static inline int pmd_none(pmd_t pmd)
504 /* Only check low word on 32-bit platforms, since it might be
505 out of sync with upper half. */
506 return (unsigned long)native_pmd_val(pmd) == 0;
509 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
511 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
515 * Currently stuck as a macro due to indirect forward reference to
516 * linux/mmzone.h's __section_mem_map_addr() definition:
518 #define pmd_page(pmd) \
519 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
522 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
524 * this macro returns the index of the entry in the pmd page which would
525 * control the given virtual address
527 static inline unsigned long pmd_index(unsigned long address)
529 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
533 * Conversion functions: convert a page and protection to a page entry,
534 * and a page entry and page directory to the page they refer to.
536 * (Currently stuck as a macro because of indirect forward reference
537 * to linux/mm.h:page_to_nid())
539 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
542 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
544 * this function returns the index of the entry in the pte page which would
545 * control the given virtual address
547 static inline unsigned long pte_index(unsigned long address)
549 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
552 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
554 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
557 static inline int pmd_bad(pmd_t pmd)
559 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
562 static inline unsigned long pages_to_mb(unsigned long npg)
564 return npg >> (20 - PAGE_SHIFT);
567 #if CONFIG_PGTABLE_LEVELS > 2
568 static inline int pud_none(pud_t pud)
570 return native_pud_val(pud) == 0;
573 static inline int pud_present(pud_t pud)
575 return pud_flags(pud) & _PAGE_PRESENT;
578 static inline unsigned long pud_page_vaddr(pud_t pud)
580 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
584 * Currently stuck as a macro due to indirect forward reference to
585 * linux/mmzone.h's __section_mem_map_addr() definition:
587 #define pud_page(pud) \
588 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
590 /* Find an entry in the second-level page table.. */
591 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
593 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
596 static inline int pud_large(pud_t pud)
598 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
599 (_PAGE_PSE | _PAGE_PRESENT);
602 static inline int pud_bad(pud_t pud)
604 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
607 static inline int pud_large(pud_t pud)
611 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
613 #if CONFIG_PGTABLE_LEVELS > 3
614 static inline int pgd_present(pgd_t pgd)
616 return pgd_flags(pgd) & _PAGE_PRESENT;
619 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
621 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
625 * Currently stuck as a macro due to indirect forward reference to
626 * linux/mmzone.h's __section_mem_map_addr() definition:
628 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
630 /* to find an entry in a page-table-directory. */
631 static inline unsigned long pud_index(unsigned long address)
633 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
636 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
638 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
641 static inline int pgd_bad(pgd_t pgd)
643 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
646 static inline int pgd_none(pgd_t pgd)
648 return !native_pgd_val(pgd);
650 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
652 #endif /* __ASSEMBLY__ */
655 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
657 * this macro returns the index of the entry in the pgd page which would
658 * control the given virtual address
660 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
663 * pgd_offset() returns a (pgd_t *)
664 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
666 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
668 * a shortcut which implies the use of the kernel's pgd, instead
671 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
674 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
675 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
679 extern int direct_gbpages;
680 void init_mem_mapping(void);
681 void early_alloc_pgt_buf(void);
683 /* local pte updates need not use xchg for locking */
684 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
688 /* Pure native function needs no input for mm, addr */
689 native_pte_clear(NULL, 0, ptep);
693 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
697 native_pmd_clear(pmdp);
701 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
702 pte_t *ptep , pte_t pte)
704 native_set_pte(ptep, pte);
707 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
708 pmd_t *pmdp , pmd_t pmd)
710 native_set_pmd(pmdp, pmd);
713 #ifndef CONFIG_PARAVIRT
715 * Rules for using pte_update - it must be called after any PTE update which
716 * has not been done using the set_pte / clear_pte interfaces. It is used by
717 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
718 * updates should either be sets, clears, or set_pte_atomic for P->P
719 * transitions, which means this hook should only be called for user PTEs.
720 * This hook implies a P->P protection or access change has taken place, which
721 * requires a subsequent TLB flush.
723 #define pte_update(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_HUGE_GET_AND_CLEAR
812 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
815 return native_pmdp_get_and_clear(pmdp);
818 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
819 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
820 unsigned long addr, pmd_t *pmdp)
822 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
826 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
828 * dst - pointer to pgd range anwhere on a pgd page
830 * count - the number of pgds to copy.
832 * dst and src can be on the same page, but the range must not overlap,
833 * and must not cross a page boundary.
835 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
837 memcpy(dst, src, count * sizeof(pgd_t));
840 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
841 static inline int page_level_shift(enum pg_level level)
843 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
845 static inline unsigned long page_level_size(enum pg_level level)
847 return 1UL << page_level_shift(level);
849 static inline unsigned long page_level_mask(enum pg_level level)
851 return ~(page_level_size(level) - 1);
855 * The x86 doesn't have any external MMU info: the kernel page
856 * tables contain all the necessary information.
858 static inline void update_mmu_cache(struct vm_area_struct *vma,
859 unsigned long addr, pte_t *ptep)
862 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
863 unsigned long addr, pmd_t *pmd)
867 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
868 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
870 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
873 static inline int pte_swp_soft_dirty(pte_t pte)
875 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
878 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
880 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
884 #include <asm-generic/pgtable.h>
885 #endif /* __ASSEMBLY__ */
887 #endif /* _ASM_X86_PGTABLE_H */