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)
49 #define set_pud_at(mm, addr, pudp, pud) native_set_pud_at(mm, addr, pudp, pud)
51 #define set_pte_atomic(ptep, pte) \
52 native_set_pte_atomic(ptep, pte)
54 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
56 #ifndef __PAGETABLE_PUD_FOLDED
57 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
58 #define pgd_clear(pgd) native_pgd_clear(pgd)
62 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
65 #ifndef __PAGETABLE_PMD_FOLDED
66 #define pud_clear(pud) native_pud_clear(pud)
69 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
70 #define pmd_clear(pmd) native_pmd_clear(pmd)
72 #define pte_update(mm, addr, ptep) do { } while (0)
74 #define pgd_val(x) native_pgd_val(x)
75 #define __pgd(x) native_make_pgd(x)
77 #ifndef __PAGETABLE_PUD_FOLDED
78 #define pud_val(x) native_pud_val(x)
79 #define __pud(x) native_make_pud(x)
82 #ifndef __PAGETABLE_PMD_FOLDED
83 #define pmd_val(x) native_pmd_val(x)
84 #define __pmd(x) native_make_pmd(x)
87 #define pte_val(x) native_pte_val(x)
88 #define __pte(x) native_make_pte(x)
90 #define arch_end_context_switch(prev) do {} while(0)
92 #endif /* CONFIG_PARAVIRT */
95 * The following only work if pte_present() is true.
96 * Undefined behaviour if not..
98 static inline int pte_dirty(pte_t pte)
100 return pte_flags(pte) & _PAGE_DIRTY;
104 static inline u32 read_pkru(void)
106 if (boot_cpu_has(X86_FEATURE_OSPKE))
107 return __read_pkru();
111 static inline void write_pkru(u32 pkru)
113 if (boot_cpu_has(X86_FEATURE_OSPKE))
117 static inline int pte_young(pte_t pte)
119 return pte_flags(pte) & _PAGE_ACCESSED;
122 static inline int pmd_dirty(pmd_t pmd)
124 return pmd_flags(pmd) & _PAGE_DIRTY;
127 static inline int pmd_young(pmd_t pmd)
129 return pmd_flags(pmd) & _PAGE_ACCESSED;
132 static inline int pud_dirty(pud_t pud)
134 return pud_flags(pud) & _PAGE_DIRTY;
137 static inline int pud_young(pud_t pud)
139 return pud_flags(pud) & _PAGE_ACCESSED;
142 static inline int pte_write(pte_t pte)
144 return pte_flags(pte) & _PAGE_RW;
147 static inline int pte_huge(pte_t pte)
149 return pte_flags(pte) & _PAGE_PSE;
152 static inline int pte_global(pte_t pte)
154 return pte_flags(pte) & _PAGE_GLOBAL;
157 static inline int pte_exec(pte_t pte)
159 return !(pte_flags(pte) & _PAGE_NX);
162 static inline int pte_special(pte_t pte)
164 return pte_flags(pte) & _PAGE_SPECIAL;
167 static inline unsigned long pte_pfn(pte_t pte)
169 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
172 static inline unsigned long pmd_pfn(pmd_t pmd)
174 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
177 static inline unsigned long pud_pfn(pud_t pud)
179 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
182 static inline unsigned long p4d_pfn(p4d_t p4d)
184 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
187 static inline int p4d_large(p4d_t p4d)
189 /* No 512 GiB pages yet */
193 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
195 static inline int pmd_large(pmd_t pte)
197 return pmd_flags(pte) & _PAGE_PSE;
200 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
201 static inline int pmd_trans_huge(pmd_t pmd)
203 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
206 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
207 static inline int pud_trans_huge(pud_t pud)
209 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
213 #define has_transparent_hugepage has_transparent_hugepage
214 static inline int has_transparent_hugepage(void)
216 return boot_cpu_has(X86_FEATURE_PSE);
219 #ifdef __HAVE_ARCH_PTE_DEVMAP
220 static inline int pmd_devmap(pmd_t pmd)
222 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
225 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
226 static inline int pud_devmap(pud_t pud)
228 return !!(pud_val(pud) & _PAGE_DEVMAP);
231 static inline int pud_devmap(pud_t pud)
237 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
239 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
241 pteval_t v = native_pte_val(pte);
243 return native_make_pte(v | set);
246 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
248 pteval_t v = native_pte_val(pte);
250 return native_make_pte(v & ~clear);
253 static inline pte_t pte_mkclean(pte_t pte)
255 return pte_clear_flags(pte, _PAGE_DIRTY);
258 static inline pte_t pte_mkold(pte_t pte)
260 return pte_clear_flags(pte, _PAGE_ACCESSED);
263 static inline pte_t pte_wrprotect(pte_t pte)
265 return pte_clear_flags(pte, _PAGE_RW);
268 static inline pte_t pte_mkexec(pte_t pte)
270 return pte_clear_flags(pte, _PAGE_NX);
273 static inline pte_t pte_mkdirty(pte_t pte)
275 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
278 static inline pte_t pte_mkyoung(pte_t pte)
280 return pte_set_flags(pte, _PAGE_ACCESSED);
283 static inline pte_t pte_mkwrite(pte_t pte)
285 return pte_set_flags(pte, _PAGE_RW);
288 static inline pte_t pte_mkhuge(pte_t pte)
290 return pte_set_flags(pte, _PAGE_PSE);
293 static inline pte_t pte_clrhuge(pte_t pte)
295 return pte_clear_flags(pte, _PAGE_PSE);
298 static inline pte_t pte_mkglobal(pte_t pte)
300 return pte_set_flags(pte, _PAGE_GLOBAL);
303 static inline pte_t pte_clrglobal(pte_t pte)
305 return pte_clear_flags(pte, _PAGE_GLOBAL);
308 static inline pte_t pte_mkspecial(pte_t pte)
310 return pte_set_flags(pte, _PAGE_SPECIAL);
313 static inline pte_t pte_mkdevmap(pte_t pte)
315 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
318 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
320 pmdval_t v = native_pmd_val(pmd);
322 return __pmd(v | set);
325 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
327 pmdval_t v = native_pmd_val(pmd);
329 return __pmd(v & ~clear);
332 static inline pmd_t pmd_mkold(pmd_t pmd)
334 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
337 static inline pmd_t pmd_mkclean(pmd_t pmd)
339 return pmd_clear_flags(pmd, _PAGE_DIRTY);
342 static inline pmd_t pmd_wrprotect(pmd_t pmd)
344 return pmd_clear_flags(pmd, _PAGE_RW);
347 static inline pmd_t pmd_mkdirty(pmd_t pmd)
349 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
352 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
354 return pmd_set_flags(pmd, _PAGE_DEVMAP);
357 static inline pmd_t pmd_mkhuge(pmd_t pmd)
359 return pmd_set_flags(pmd, _PAGE_PSE);
362 static inline pmd_t pmd_mkyoung(pmd_t pmd)
364 return pmd_set_flags(pmd, _PAGE_ACCESSED);
367 static inline pmd_t pmd_mkwrite(pmd_t pmd)
369 return pmd_set_flags(pmd, _PAGE_RW);
372 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
374 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
377 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
379 pudval_t v = native_pud_val(pud);
381 return __pud(v | set);
384 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
386 pudval_t v = native_pud_val(pud);
388 return __pud(v & ~clear);
391 static inline pud_t pud_mkold(pud_t pud)
393 return pud_clear_flags(pud, _PAGE_ACCESSED);
396 static inline pud_t pud_mkclean(pud_t pud)
398 return pud_clear_flags(pud, _PAGE_DIRTY);
401 static inline pud_t pud_wrprotect(pud_t pud)
403 return pud_clear_flags(pud, _PAGE_RW);
406 static inline pud_t pud_mkdirty(pud_t pud)
408 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
411 static inline pud_t pud_mkdevmap(pud_t pud)
413 return pud_set_flags(pud, _PAGE_DEVMAP);
416 static inline pud_t pud_mkhuge(pud_t pud)
418 return pud_set_flags(pud, _PAGE_PSE);
421 static inline pud_t pud_mkyoung(pud_t pud)
423 return pud_set_flags(pud, _PAGE_ACCESSED);
426 static inline pud_t pud_mkwrite(pud_t pud)
428 return pud_set_flags(pud, _PAGE_RW);
431 static inline pud_t pud_mknotpresent(pud_t pud)
433 return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE);
436 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
437 static inline int pte_soft_dirty(pte_t pte)
439 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
442 static inline int pmd_soft_dirty(pmd_t pmd)
444 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
447 static inline int pud_soft_dirty(pud_t pud)
449 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
452 static inline pte_t pte_mksoft_dirty(pte_t pte)
454 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
457 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
459 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
462 static inline pud_t pud_mksoft_dirty(pud_t pud)
464 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
467 static inline pte_t pte_clear_soft_dirty(pte_t pte)
469 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
472 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
474 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
477 static inline pud_t pud_clear_soft_dirty(pud_t pud)
479 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
482 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
485 * Mask out unsupported bits in a present pgprot. Non-present pgprots
486 * can use those bits for other purposes, so leave them be.
488 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
490 pgprotval_t protval = pgprot_val(pgprot);
492 if (protval & _PAGE_PRESENT)
493 protval &= __supported_pte_mask;
498 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
500 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
501 massage_pgprot(pgprot));
504 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
506 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
507 massage_pgprot(pgprot));
510 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
512 return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) |
513 massage_pgprot(pgprot));
516 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
518 pteval_t val = pte_val(pte);
521 * Chop off the NX bit (if present), and add the NX portion of
522 * the newprot (if present):
524 val &= _PAGE_CHG_MASK;
525 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
530 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
532 pmdval_t val = pmd_val(pmd);
534 val &= _HPAGE_CHG_MASK;
535 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
540 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
541 #define pgprot_modify pgprot_modify
542 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
544 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
545 pgprotval_t addbits = pgprot_val(newprot);
546 return __pgprot(preservebits | addbits);
549 #define pte_pgprot(x) __pgprot(pte_flags(x))
550 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
551 #define pud_pgprot(x) __pgprot(pud_flags(x))
553 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
555 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
556 enum page_cache_mode pcm,
557 enum page_cache_mode new_pcm)
560 * PAT type is always WB for untracked ranges, so no need to check.
562 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
566 * Certain new memtypes are not allowed with certain
568 * - request is uncached, return cannot be write-back
569 * - request is write-combine, return cannot be write-back
570 * - request is write-through, return cannot be write-back
571 * - request is write-through, return cannot be write-combine
573 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
574 new_pcm == _PAGE_CACHE_MODE_WB) ||
575 (pcm == _PAGE_CACHE_MODE_WC &&
576 new_pcm == _PAGE_CACHE_MODE_WB) ||
577 (pcm == _PAGE_CACHE_MODE_WT &&
578 new_pcm == _PAGE_CACHE_MODE_WB) ||
579 (pcm == _PAGE_CACHE_MODE_WT &&
580 new_pcm == _PAGE_CACHE_MODE_WC)) {
587 pmd_t *populate_extra_pmd(unsigned long vaddr);
588 pte_t *populate_extra_pte(unsigned long vaddr);
589 #endif /* __ASSEMBLY__ */
592 # include <asm/pgtable_32.h>
594 # include <asm/pgtable_64.h>
598 #include <linux/mm_types.h>
599 #include <linux/mmdebug.h>
600 #include <linux/log2.h>
602 static inline int pte_none(pte_t pte)
604 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
607 #define __HAVE_ARCH_PTE_SAME
608 static inline int pte_same(pte_t a, pte_t b)
610 return a.pte == b.pte;
613 static inline int pte_present(pte_t a)
615 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
618 #ifdef __HAVE_ARCH_PTE_DEVMAP
619 static inline int pte_devmap(pte_t a)
621 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
625 #define pte_accessible pte_accessible
626 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
628 if (pte_flags(a) & _PAGE_PRESENT)
631 if ((pte_flags(a) & _PAGE_PROTNONE) &&
632 mm_tlb_flush_pending(mm))
638 static inline int pte_hidden(pte_t pte)
640 return pte_flags(pte) & _PAGE_HIDDEN;
643 static inline int pmd_present(pmd_t pmd)
646 * Checking for _PAGE_PSE is needed too because
647 * split_huge_page will temporarily clear the present bit (but
648 * the _PAGE_PSE flag will remain set at all times while the
649 * _PAGE_PRESENT bit is clear).
651 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
654 #ifdef CONFIG_NUMA_BALANCING
656 * These work without NUMA balancing but the kernel does not care. See the
657 * comment in include/asm-generic/pgtable.h
659 static inline int pte_protnone(pte_t pte)
661 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
665 static inline int pmd_protnone(pmd_t pmd)
667 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
670 #endif /* CONFIG_NUMA_BALANCING */
672 static inline int pmd_none(pmd_t pmd)
674 /* Only check low word on 32-bit platforms, since it might be
675 out of sync with upper half. */
676 unsigned long val = native_pmd_val(pmd);
677 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
680 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
682 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
686 * Currently stuck as a macro due to indirect forward reference to
687 * linux/mmzone.h's __section_mem_map_addr() definition:
689 #define pmd_page(pmd) \
690 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
693 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
695 * this macro returns the index of the entry in the pmd page which would
696 * control the given virtual address
698 static inline unsigned long pmd_index(unsigned long address)
700 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
704 * Conversion functions: convert a page and protection to a page entry,
705 * and a page entry and page directory to the page they refer to.
707 * (Currently stuck as a macro because of indirect forward reference
708 * to linux/mm.h:page_to_nid())
710 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
713 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
715 * this function returns the index of the entry in the pte page which would
716 * control the given virtual address
718 static inline unsigned long pte_index(unsigned long address)
720 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
723 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
725 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
728 static inline int pmd_bad(pmd_t pmd)
730 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
733 static inline unsigned long pages_to_mb(unsigned long npg)
735 return npg >> (20 - PAGE_SHIFT);
738 #if CONFIG_PGTABLE_LEVELS > 2
739 static inline int pud_none(pud_t pud)
741 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
744 static inline int pud_present(pud_t pud)
746 return pud_flags(pud) & _PAGE_PRESENT;
749 static inline unsigned long pud_page_vaddr(pud_t pud)
751 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
755 * Currently stuck as a macro due to indirect forward reference to
756 * linux/mmzone.h's __section_mem_map_addr() definition:
758 #define pud_page(pud) \
759 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
761 /* Find an entry in the second-level page table.. */
762 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
764 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
767 static inline int pud_large(pud_t pud)
769 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
770 (_PAGE_PSE | _PAGE_PRESENT);
773 static inline int pud_bad(pud_t pud)
775 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
778 static inline int pud_large(pud_t pud)
782 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
784 static inline unsigned long pud_index(unsigned long address)
786 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
789 static inline unsigned long p4d_index(unsigned long address)
791 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
794 #if CONFIG_PGTABLE_LEVELS > 3
795 static inline int pgd_present(pgd_t pgd)
797 return pgd_flags(pgd) & _PAGE_PRESENT;
800 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
802 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
806 * Currently stuck as a macro due to indirect forward reference to
807 * linux/mmzone.h's __section_mem_map_addr() definition:
809 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
811 /* to find an entry in a page-table-directory. */
812 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
814 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
817 static inline int pgd_bad(pgd_t pgd)
819 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
822 static inline int pgd_none(pgd_t pgd)
825 * There is no need to do a workaround for the KNL stray
826 * A/D bit erratum here. PGDs only point to page tables
827 * except on 32-bit non-PAE which is not supported on
830 return !native_pgd_val(pgd);
832 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
834 #endif /* __ASSEMBLY__ */
837 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
839 * this macro returns the index of the entry in the pgd page which would
840 * control the given virtual address
842 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
845 * pgd_offset() returns a (pgd_t *)
846 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
848 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
850 * a shortcut which implies the use of the kernel's pgd, instead
853 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
856 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
857 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
861 extern int direct_gbpages;
862 void init_mem_mapping(void);
863 void early_alloc_pgt_buf(void);
866 /* Realmode trampoline initialization. */
867 extern pgd_t trampoline_pgd_entry;
868 static inline void __meminit init_trampoline_default(void)
870 /* Default trampoline pgd value */
871 trampoline_pgd_entry = init_level4_pgt[pgd_index(__PAGE_OFFSET)];
873 # ifdef CONFIG_RANDOMIZE_MEMORY
874 void __meminit init_trampoline(void);
876 # define init_trampoline init_trampoline_default
879 static inline void init_trampoline(void) { }
882 /* local pte updates need not use xchg for locking */
883 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
887 /* Pure native function needs no input for mm, addr */
888 native_pte_clear(NULL, 0, ptep);
892 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
896 native_pmd_clear(pmdp);
900 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
904 native_pud_clear(pudp);
908 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
909 pte_t *ptep , pte_t pte)
911 native_set_pte(ptep, pte);
914 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
915 pmd_t *pmdp , pmd_t pmd)
917 native_set_pmd(pmdp, pmd);
920 static inline void native_set_pud_at(struct mm_struct *mm, unsigned long addr,
921 pud_t *pudp, pud_t pud)
923 native_set_pud(pudp, pud);
926 #ifndef CONFIG_PARAVIRT
928 * Rules for using pte_update - it must be called after any PTE update which
929 * has not been done using the set_pte / clear_pte interfaces. It is used by
930 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
931 * updates should either be sets, clears, or set_pte_atomic for P->P
932 * transitions, which means this hook should only be called for user PTEs.
933 * This hook implies a P->P protection or access change has taken place, which
934 * requires a subsequent TLB flush.
936 #define pte_update(mm, addr, ptep) do { } while (0)
940 * We only update the dirty/accessed state if we set
941 * the dirty bit by hand in the kernel, since the hardware
942 * will do the accessed bit for us, and we don't want to
943 * race with other CPU's that might be updating the dirty
944 * bit at the same time.
946 struct vm_area_struct;
948 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
949 extern int ptep_set_access_flags(struct vm_area_struct *vma,
950 unsigned long address, pte_t *ptep,
951 pte_t entry, int dirty);
953 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
954 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
955 unsigned long addr, pte_t *ptep);
957 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
958 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
959 unsigned long address, pte_t *ptep);
961 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
962 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
965 pte_t pte = native_ptep_get_and_clear(ptep);
966 pte_update(mm, addr, ptep);
970 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
971 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
972 unsigned long addr, pte_t *ptep,
978 * Full address destruction in progress; paravirt does not
979 * care about updates and native needs no locking
981 pte = native_local_ptep_get_and_clear(ptep);
983 pte = ptep_get_and_clear(mm, addr, ptep);
988 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
989 static inline void ptep_set_wrprotect(struct mm_struct *mm,
990 unsigned long addr, pte_t *ptep)
992 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
993 pte_update(mm, addr, ptep);
996 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
998 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1000 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1001 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1002 unsigned long address, pmd_t *pmdp,
1003 pmd_t entry, int dirty);
1004 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1005 unsigned long address, pud_t *pudp,
1006 pud_t entry, int dirty);
1008 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1009 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1010 unsigned long addr, pmd_t *pmdp);
1011 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1012 unsigned long addr, pud_t *pudp);
1014 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1015 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1016 unsigned long address, pmd_t *pmdp);
1019 #define __HAVE_ARCH_PMD_WRITE
1020 static inline int pmd_write(pmd_t pmd)
1022 return pmd_flags(pmd) & _PAGE_RW;
1025 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1026 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1029 return native_pmdp_get_and_clear(pmdp);
1032 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1033 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1034 unsigned long addr, pud_t *pudp)
1036 return native_pudp_get_and_clear(pudp);
1039 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1040 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1041 unsigned long addr, pmd_t *pmdp)
1043 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1047 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1049 * dst - pointer to pgd range anwhere on a pgd page
1051 * count - the number of pgds to copy.
1053 * dst and src can be on the same page, but the range must not overlap,
1054 * and must not cross a page boundary.
1056 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1058 memcpy(dst, src, count * sizeof(pgd_t));
1061 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1062 static inline int page_level_shift(enum pg_level level)
1064 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1066 static inline unsigned long page_level_size(enum pg_level level)
1068 return 1UL << page_level_shift(level);
1070 static inline unsigned long page_level_mask(enum pg_level level)
1072 return ~(page_level_size(level) - 1);
1076 * The x86 doesn't have any external MMU info: the kernel page
1077 * tables contain all the necessary information.
1079 static inline void update_mmu_cache(struct vm_area_struct *vma,
1080 unsigned long addr, pte_t *ptep)
1083 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1084 unsigned long addr, pmd_t *pmd)
1087 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1088 unsigned long addr, pud_t *pud)
1092 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1093 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1095 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1098 static inline int pte_swp_soft_dirty(pte_t pte)
1100 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1103 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1105 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1109 #define PKRU_AD_BIT 0x1
1110 #define PKRU_WD_BIT 0x2
1111 #define PKRU_BITS_PER_PKEY 2
1113 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
1115 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1116 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
1119 static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
1121 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1123 * Access-disable disables writes too so we need to check
1126 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
1129 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1131 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1132 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1133 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1139 #include <asm-generic/pgtable.h>
1140 #endif /* __ASSEMBLY__ */
1142 #endif /* _ASM_X86_PGTABLE_H */