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;
103 static inline u32 read_pkru(void)
105 if (boot_cpu_has(X86_FEATURE_OSPKE))
106 return __read_pkru();
110 static inline int pte_young(pte_t pte)
112 return pte_flags(pte) & _PAGE_ACCESSED;
115 static inline int pmd_dirty(pmd_t pmd)
117 return pmd_flags(pmd) & _PAGE_DIRTY;
120 static inline int pmd_young(pmd_t pmd)
122 return pmd_flags(pmd) & _PAGE_ACCESSED;
125 static inline int pte_write(pte_t pte)
127 return pte_flags(pte) & _PAGE_RW;
130 static inline int pte_huge(pte_t pte)
132 return pte_flags(pte) & _PAGE_PSE;
135 static inline int pte_global(pte_t pte)
137 return pte_flags(pte) & _PAGE_GLOBAL;
140 static inline int pte_exec(pte_t pte)
142 return !(pte_flags(pte) & _PAGE_NX);
145 static inline int pte_special(pte_t pte)
147 return pte_flags(pte) & _PAGE_SPECIAL;
150 static inline unsigned long pte_pfn(pte_t pte)
152 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
155 static inline unsigned long pmd_pfn(pmd_t pmd)
157 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
160 static inline unsigned long pud_pfn(pud_t pud)
162 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
165 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
167 static inline int pmd_large(pmd_t pte)
169 return pmd_flags(pte) & _PAGE_PSE;
172 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
173 static inline int pmd_trans_huge(pmd_t pmd)
175 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
178 static inline int has_transparent_hugepage(void)
183 #ifdef __HAVE_ARCH_PTE_DEVMAP
184 static inline int pmd_devmap(pmd_t pmd)
186 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
189 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
191 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
193 pteval_t v = native_pte_val(pte);
195 return native_make_pte(v | set);
198 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
200 pteval_t v = native_pte_val(pte);
202 return native_make_pte(v & ~clear);
205 static inline pte_t pte_mkclean(pte_t pte)
207 return pte_clear_flags(pte, _PAGE_DIRTY);
210 static inline pte_t pte_mkold(pte_t pte)
212 return pte_clear_flags(pte, _PAGE_ACCESSED);
215 static inline pte_t pte_wrprotect(pte_t pte)
217 return pte_clear_flags(pte, _PAGE_RW);
220 static inline pte_t pte_mkexec(pte_t pte)
222 return pte_clear_flags(pte, _PAGE_NX);
225 static inline pte_t pte_mkdirty(pte_t pte)
227 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
230 static inline pte_t pte_mkyoung(pte_t pte)
232 return pte_set_flags(pte, _PAGE_ACCESSED);
235 static inline pte_t pte_mkwrite(pte_t pte)
237 return pte_set_flags(pte, _PAGE_RW);
240 static inline pte_t pte_mkhuge(pte_t pte)
242 return pte_set_flags(pte, _PAGE_PSE);
245 static inline pte_t pte_clrhuge(pte_t pte)
247 return pte_clear_flags(pte, _PAGE_PSE);
250 static inline pte_t pte_mkglobal(pte_t pte)
252 return pte_set_flags(pte, _PAGE_GLOBAL);
255 static inline pte_t pte_clrglobal(pte_t pte)
257 return pte_clear_flags(pte, _PAGE_GLOBAL);
260 static inline pte_t pte_mkspecial(pte_t pte)
262 return pte_set_flags(pte, _PAGE_SPECIAL);
265 static inline pte_t pte_mkdevmap(pte_t pte)
267 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
270 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
272 pmdval_t v = native_pmd_val(pmd);
274 return __pmd(v | set);
277 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
279 pmdval_t v = native_pmd_val(pmd);
281 return __pmd(v & ~clear);
284 static inline pmd_t pmd_mkold(pmd_t pmd)
286 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
289 static inline pmd_t pmd_mkclean(pmd_t pmd)
291 return pmd_clear_flags(pmd, _PAGE_DIRTY);
294 static inline pmd_t pmd_wrprotect(pmd_t pmd)
296 return pmd_clear_flags(pmd, _PAGE_RW);
299 static inline pmd_t pmd_mkdirty(pmd_t pmd)
301 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
304 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
306 return pmd_set_flags(pmd, _PAGE_DEVMAP);
309 static inline pmd_t pmd_mkhuge(pmd_t pmd)
311 return pmd_set_flags(pmd, _PAGE_PSE);
314 static inline pmd_t pmd_mkyoung(pmd_t pmd)
316 return pmd_set_flags(pmd, _PAGE_ACCESSED);
319 static inline pmd_t pmd_mkwrite(pmd_t pmd)
321 return pmd_set_flags(pmd, _PAGE_RW);
324 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
326 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
329 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
330 static inline int pte_soft_dirty(pte_t pte)
332 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
335 static inline int pmd_soft_dirty(pmd_t pmd)
337 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
340 static inline pte_t pte_mksoft_dirty(pte_t pte)
342 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
345 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
347 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
350 static inline pte_t pte_clear_soft_dirty(pte_t pte)
352 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
355 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
357 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
360 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
363 * Mask out unsupported bits in a present pgprot. Non-present pgprots
364 * can use those bits for other purposes, so leave them be.
366 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
368 pgprotval_t protval = pgprot_val(pgprot);
370 if (protval & _PAGE_PRESENT)
371 protval &= __supported_pte_mask;
376 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
378 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
379 massage_pgprot(pgprot));
382 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
384 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
385 massage_pgprot(pgprot));
388 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
390 pteval_t val = pte_val(pte);
393 * Chop off the NX bit (if present), and add the NX portion of
394 * the newprot (if present):
396 val &= _PAGE_CHG_MASK;
397 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
402 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
404 pmdval_t val = pmd_val(pmd);
406 val &= _HPAGE_CHG_MASK;
407 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
412 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
413 #define pgprot_modify pgprot_modify
414 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
416 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
417 pgprotval_t addbits = pgprot_val(newprot);
418 return __pgprot(preservebits | addbits);
421 #define pte_pgprot(x) __pgprot(pte_flags(x))
422 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
423 #define pud_pgprot(x) __pgprot(pud_flags(x))
425 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
427 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
428 enum page_cache_mode pcm,
429 enum page_cache_mode new_pcm)
432 * PAT type is always WB for untracked ranges, so no need to check.
434 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
438 * Certain new memtypes are not allowed with certain
440 * - request is uncached, return cannot be write-back
441 * - request is write-combine, return cannot be write-back
442 * - request is write-through, return cannot be write-back
443 * - request is write-through, return cannot be write-combine
445 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
446 new_pcm == _PAGE_CACHE_MODE_WB) ||
447 (pcm == _PAGE_CACHE_MODE_WC &&
448 new_pcm == _PAGE_CACHE_MODE_WB) ||
449 (pcm == _PAGE_CACHE_MODE_WT &&
450 new_pcm == _PAGE_CACHE_MODE_WB) ||
451 (pcm == _PAGE_CACHE_MODE_WT &&
452 new_pcm == _PAGE_CACHE_MODE_WC)) {
459 pmd_t *populate_extra_pmd(unsigned long vaddr);
460 pte_t *populate_extra_pte(unsigned long vaddr);
461 #endif /* __ASSEMBLY__ */
464 # include <asm/pgtable_32.h>
466 # include <asm/pgtable_64.h>
470 #include <linux/mm_types.h>
471 #include <linux/mmdebug.h>
472 #include <linux/log2.h>
474 static inline int pte_none(pte_t pte)
479 #define __HAVE_ARCH_PTE_SAME
480 static inline int pte_same(pte_t a, pte_t b)
482 return a.pte == b.pte;
485 static inline int pte_present(pte_t a)
487 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
490 #ifdef __HAVE_ARCH_PTE_DEVMAP
491 static inline int pte_devmap(pte_t a)
493 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
497 #define pte_accessible pte_accessible
498 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
500 if (pte_flags(a) & _PAGE_PRESENT)
503 if ((pte_flags(a) & _PAGE_PROTNONE) &&
504 mm_tlb_flush_pending(mm))
510 static inline int pte_hidden(pte_t pte)
512 return pte_flags(pte) & _PAGE_HIDDEN;
515 static inline int pmd_present(pmd_t pmd)
518 * Checking for _PAGE_PSE is needed too because
519 * split_huge_page will temporarily clear the present bit (but
520 * the _PAGE_PSE flag will remain set at all times while the
521 * _PAGE_PRESENT bit is clear).
523 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
526 #ifdef CONFIG_NUMA_BALANCING
528 * These work without NUMA balancing but the kernel does not care. See the
529 * comment in include/asm-generic/pgtable.h
531 static inline int pte_protnone(pte_t pte)
533 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
537 static inline int pmd_protnone(pmd_t pmd)
539 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
542 #endif /* CONFIG_NUMA_BALANCING */
544 static inline int pmd_none(pmd_t pmd)
546 /* Only check low word on 32-bit platforms, since it might be
547 out of sync with upper half. */
548 return (unsigned long)native_pmd_val(pmd) == 0;
551 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
553 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
557 * Currently stuck as a macro due to indirect forward reference to
558 * linux/mmzone.h's __section_mem_map_addr() definition:
560 #define pmd_page(pmd) \
561 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
564 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
566 * this macro returns the index of the entry in the pmd page which would
567 * control the given virtual address
569 static inline unsigned long pmd_index(unsigned long address)
571 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
575 * Conversion functions: convert a page and protection to a page entry,
576 * and a page entry and page directory to the page they refer to.
578 * (Currently stuck as a macro because of indirect forward reference
579 * to linux/mm.h:page_to_nid())
581 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
584 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
586 * this function returns the index of the entry in the pte page which would
587 * control the given virtual address
589 static inline unsigned long pte_index(unsigned long address)
591 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
594 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
596 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
599 static inline int pmd_bad(pmd_t pmd)
601 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
604 static inline unsigned long pages_to_mb(unsigned long npg)
606 return npg >> (20 - PAGE_SHIFT);
609 #if CONFIG_PGTABLE_LEVELS > 2
610 static inline int pud_none(pud_t pud)
612 return native_pud_val(pud) == 0;
615 static inline int pud_present(pud_t pud)
617 return pud_flags(pud) & _PAGE_PRESENT;
620 static inline unsigned long pud_page_vaddr(pud_t pud)
622 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
626 * Currently stuck as a macro due to indirect forward reference to
627 * linux/mmzone.h's __section_mem_map_addr() definition:
629 #define pud_page(pud) \
630 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
632 /* Find an entry in the second-level page table.. */
633 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
635 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
638 static inline int pud_large(pud_t pud)
640 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
641 (_PAGE_PSE | _PAGE_PRESENT);
644 static inline int pud_bad(pud_t pud)
646 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
649 static inline int pud_large(pud_t pud)
653 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
655 #if CONFIG_PGTABLE_LEVELS > 3
656 static inline int pgd_present(pgd_t pgd)
658 return pgd_flags(pgd) & _PAGE_PRESENT;
661 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
663 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
667 * Currently stuck as a macro due to indirect forward reference to
668 * linux/mmzone.h's __section_mem_map_addr() definition:
670 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
672 /* to find an entry in a page-table-directory. */
673 static inline unsigned long pud_index(unsigned long address)
675 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
678 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
680 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
683 static inline int pgd_bad(pgd_t pgd)
685 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
688 static inline int pgd_none(pgd_t pgd)
690 return !native_pgd_val(pgd);
692 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
694 #endif /* __ASSEMBLY__ */
697 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
699 * this macro returns the index of the entry in the pgd page which would
700 * control the given virtual address
702 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
705 * pgd_offset() returns a (pgd_t *)
706 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
708 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
710 * a shortcut which implies the use of the kernel's pgd, instead
713 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
716 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
717 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
721 extern int direct_gbpages;
722 void init_mem_mapping(void);
723 void early_alloc_pgt_buf(void);
725 /* local pte updates need not use xchg for locking */
726 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
730 /* Pure native function needs no input for mm, addr */
731 native_pte_clear(NULL, 0, ptep);
735 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
739 native_pmd_clear(pmdp);
743 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
744 pte_t *ptep , pte_t pte)
746 native_set_pte(ptep, pte);
749 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
750 pmd_t *pmdp , pmd_t pmd)
752 native_set_pmd(pmdp, pmd);
755 #ifndef CONFIG_PARAVIRT
757 * Rules for using pte_update - it must be called after any PTE update which
758 * has not been done using the set_pte / clear_pte interfaces. It is used by
759 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
760 * updates should either be sets, clears, or set_pte_atomic for P->P
761 * transitions, which means this hook should only be called for user PTEs.
762 * This hook implies a P->P protection or access change has taken place, which
763 * requires a subsequent TLB flush.
765 #define pte_update(mm, addr, ptep) do { } while (0)
769 * We only update the dirty/accessed state if we set
770 * the dirty bit by hand in the kernel, since the hardware
771 * will do the accessed bit for us, and we don't want to
772 * race with other CPU's that might be updating the dirty
773 * bit at the same time.
775 struct vm_area_struct;
777 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
778 extern int ptep_set_access_flags(struct vm_area_struct *vma,
779 unsigned long address, pte_t *ptep,
780 pte_t entry, int dirty);
782 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
783 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
784 unsigned long addr, pte_t *ptep);
786 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
787 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
788 unsigned long address, pte_t *ptep);
790 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
791 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
794 pte_t pte = native_ptep_get_and_clear(ptep);
795 pte_update(mm, addr, ptep);
799 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
800 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
801 unsigned long addr, pte_t *ptep,
807 * Full address destruction in progress; paravirt does not
808 * care about updates and native needs no locking
810 pte = native_local_ptep_get_and_clear(ptep);
812 pte = ptep_get_and_clear(mm, addr, ptep);
817 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
818 static inline void ptep_set_wrprotect(struct mm_struct *mm,
819 unsigned long addr, pte_t *ptep)
821 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
822 pte_update(mm, addr, ptep);
825 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
827 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
829 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
830 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
831 unsigned long address, pmd_t *pmdp,
832 pmd_t entry, int dirty);
834 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
835 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
836 unsigned long addr, pmd_t *pmdp);
838 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
839 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
840 unsigned long address, pmd_t *pmdp);
843 #define __HAVE_ARCH_PMD_WRITE
844 static inline int pmd_write(pmd_t pmd)
846 return pmd_flags(pmd) & _PAGE_RW;
849 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
850 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
853 return native_pmdp_get_and_clear(pmdp);
856 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
857 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
858 unsigned long addr, pmd_t *pmdp)
860 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
864 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
866 * dst - pointer to pgd range anwhere on a pgd page
868 * count - the number of pgds to copy.
870 * dst and src can be on the same page, but the range must not overlap,
871 * and must not cross a page boundary.
873 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
875 memcpy(dst, src, count * sizeof(pgd_t));
878 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
879 static inline int page_level_shift(enum pg_level level)
881 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
883 static inline unsigned long page_level_size(enum pg_level level)
885 return 1UL << page_level_shift(level);
887 static inline unsigned long page_level_mask(enum pg_level level)
889 return ~(page_level_size(level) - 1);
893 * The x86 doesn't have any external MMU info: the kernel page
894 * tables contain all the necessary information.
896 static inline void update_mmu_cache(struct vm_area_struct *vma,
897 unsigned long addr, pte_t *ptep)
900 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
901 unsigned long addr, pmd_t *pmd)
905 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
906 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
908 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
911 static inline int pte_swp_soft_dirty(pte_t pte)
913 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
916 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
918 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
922 #define PKRU_AD_BIT 0x1
923 #define PKRU_WD_BIT 0x2
924 #define PKRU_BITS_PER_PKEY 2
926 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
928 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
929 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
932 static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
934 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
936 * Access-disable disables writes too so we need to check
939 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
942 static inline u16 pte_flags_pkey(unsigned long pte_flags)
944 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
945 /* ifdef to avoid doing 59-bit shift on 32-bit values */
946 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
952 #include <asm-generic/pgtable.h>
953 #endif /* __ASSEMBLY__ */
955 #endif /* _ASM_X86_PGTABLE_H */