1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_H
3 #define _ASM_X86_PGTABLE_H
5 #include <linux/mem_encrypt.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 * Macros to add or remove encryption attribute
21 #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot)))
22 #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot)))
25 #include <asm/x86_init.h>
27 extern pgd_t early_top_pgt[PTRS_PER_PGD];
28 int __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
30 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
31 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user);
32 void ptdump_walk_pgd_level_checkwx(void);
34 #ifdef CONFIG_DEBUG_WX
35 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
37 #define debug_checkwx() do { } while (0)
41 * ZERO_PAGE is a global shared page that is always zero: used
42 * for zero-mapped memory areas etc..
44 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
46 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
48 extern spinlock_t pgd_lock;
49 extern struct list_head pgd_list;
51 extern struct mm_struct *pgd_page_get_mm(struct page *page);
53 extern pmdval_t early_pmd_flags;
55 #ifdef CONFIG_PARAVIRT
56 #include <asm/paravirt.h>
57 #else /* !CONFIG_PARAVIRT */
58 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
59 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
61 #define set_pte_atomic(ptep, pte) \
62 native_set_pte_atomic(ptep, pte)
64 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
66 #ifndef __PAGETABLE_P4D_FOLDED
67 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
68 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
72 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
75 #ifndef __PAGETABLE_PUD_FOLDED
76 #define p4d_clear(p4d) native_p4d_clear(p4d)
80 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
83 #ifndef __PAGETABLE_PUD_FOLDED
84 #define pud_clear(pud) native_pud_clear(pud)
87 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
88 #define pmd_clear(pmd) native_pmd_clear(pmd)
90 #define pgd_val(x) native_pgd_val(x)
91 #define __pgd(x) native_make_pgd(x)
93 #ifndef __PAGETABLE_P4D_FOLDED
94 #define p4d_val(x) native_p4d_val(x)
95 #define __p4d(x) native_make_p4d(x)
98 #ifndef __PAGETABLE_PUD_FOLDED
99 #define pud_val(x) native_pud_val(x)
100 #define __pud(x) native_make_pud(x)
103 #ifndef __PAGETABLE_PMD_FOLDED
104 #define pmd_val(x) native_pmd_val(x)
105 #define __pmd(x) native_make_pmd(x)
108 #define pte_val(x) native_pte_val(x)
109 #define __pte(x) native_make_pte(x)
111 #define arch_end_context_switch(prev) do {} while(0)
113 #endif /* CONFIG_PARAVIRT */
116 * The following only work if pte_present() is true.
117 * Undefined behaviour if not..
119 static inline int pte_dirty(pte_t pte)
121 return pte_flags(pte) & _PAGE_DIRTY;
125 static inline u32 read_pkru(void)
127 if (boot_cpu_has(X86_FEATURE_OSPKE))
128 return __read_pkru();
132 static inline void write_pkru(u32 pkru)
134 if (boot_cpu_has(X86_FEATURE_OSPKE))
138 static inline int pte_young(pte_t pte)
140 return pte_flags(pte) & _PAGE_ACCESSED;
143 static inline int pmd_dirty(pmd_t pmd)
145 return pmd_flags(pmd) & _PAGE_DIRTY;
148 static inline int pmd_young(pmd_t pmd)
150 return pmd_flags(pmd) & _PAGE_ACCESSED;
153 static inline int pud_dirty(pud_t pud)
155 return pud_flags(pud) & _PAGE_DIRTY;
158 static inline int pud_young(pud_t pud)
160 return pud_flags(pud) & _PAGE_ACCESSED;
163 static inline int pte_write(pte_t pte)
165 return pte_flags(pte) & _PAGE_RW;
168 static inline int pte_huge(pte_t pte)
170 return pte_flags(pte) & _PAGE_PSE;
173 static inline int pte_global(pte_t pte)
175 return pte_flags(pte) & _PAGE_GLOBAL;
178 static inline int pte_exec(pte_t pte)
180 return !(pte_flags(pte) & _PAGE_NX);
183 static inline int pte_special(pte_t pte)
185 return pte_flags(pte) & _PAGE_SPECIAL;
188 static inline unsigned long pte_pfn(pte_t pte)
190 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
193 static inline unsigned long pmd_pfn(pmd_t pmd)
195 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
198 static inline unsigned long pud_pfn(pud_t pud)
200 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
203 static inline unsigned long p4d_pfn(p4d_t p4d)
205 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
208 static inline unsigned long pgd_pfn(pgd_t pgd)
210 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
213 static inline int p4d_large(p4d_t p4d)
215 /* No 512 GiB pages yet */
219 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
221 static inline int pmd_large(pmd_t pte)
223 return pmd_flags(pte) & _PAGE_PSE;
226 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
227 static inline int pmd_trans_huge(pmd_t pmd)
229 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
232 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
233 static inline int pud_trans_huge(pud_t pud)
235 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
239 #define has_transparent_hugepage has_transparent_hugepage
240 static inline int has_transparent_hugepage(void)
242 return boot_cpu_has(X86_FEATURE_PSE);
245 #ifdef __HAVE_ARCH_PTE_DEVMAP
246 static inline int pmd_devmap(pmd_t pmd)
248 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
251 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
252 static inline int pud_devmap(pud_t pud)
254 return !!(pud_val(pud) & _PAGE_DEVMAP);
257 static inline int pud_devmap(pud_t pud)
263 static inline int pgd_devmap(pgd_t pgd)
268 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
270 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
272 pteval_t v = native_pte_val(pte);
274 return native_make_pte(v | set);
277 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
279 pteval_t v = native_pte_val(pte);
281 return native_make_pte(v & ~clear);
284 static inline pte_t pte_mkclean(pte_t pte)
286 return pte_clear_flags(pte, _PAGE_DIRTY);
289 static inline pte_t pte_mkold(pte_t pte)
291 return pte_clear_flags(pte, _PAGE_ACCESSED);
294 static inline pte_t pte_wrprotect(pte_t pte)
296 return pte_clear_flags(pte, _PAGE_RW);
299 static inline pte_t pte_mkexec(pte_t pte)
301 return pte_clear_flags(pte, _PAGE_NX);
304 static inline pte_t pte_mkdirty(pte_t pte)
306 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
309 static inline pte_t pte_mkyoung(pte_t pte)
311 return pte_set_flags(pte, _PAGE_ACCESSED);
314 static inline pte_t pte_mkwrite(pte_t pte)
316 return pte_set_flags(pte, _PAGE_RW);
319 static inline pte_t pte_mkhuge(pte_t pte)
321 return pte_set_flags(pte, _PAGE_PSE);
324 static inline pte_t pte_clrhuge(pte_t pte)
326 return pte_clear_flags(pte, _PAGE_PSE);
329 static inline pte_t pte_mkglobal(pte_t pte)
331 return pte_set_flags(pte, _PAGE_GLOBAL);
334 static inline pte_t pte_clrglobal(pte_t pte)
336 return pte_clear_flags(pte, _PAGE_GLOBAL);
339 static inline pte_t pte_mkspecial(pte_t pte)
341 return pte_set_flags(pte, _PAGE_SPECIAL);
344 static inline pte_t pte_mkdevmap(pte_t pte)
346 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
349 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
351 pmdval_t v = native_pmd_val(pmd);
353 return native_make_pmd(v | set);
356 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
358 pmdval_t v = native_pmd_val(pmd);
360 return native_make_pmd(v & ~clear);
363 static inline pmd_t pmd_mkold(pmd_t pmd)
365 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
368 static inline pmd_t pmd_mkclean(pmd_t pmd)
370 return pmd_clear_flags(pmd, _PAGE_DIRTY);
373 static inline pmd_t pmd_wrprotect(pmd_t pmd)
375 return pmd_clear_flags(pmd, _PAGE_RW);
378 static inline pmd_t pmd_mkdirty(pmd_t pmd)
380 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
383 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
385 return pmd_set_flags(pmd, _PAGE_DEVMAP);
388 static inline pmd_t pmd_mkhuge(pmd_t pmd)
390 return pmd_set_flags(pmd, _PAGE_PSE);
393 static inline pmd_t pmd_mkyoung(pmd_t pmd)
395 return pmd_set_flags(pmd, _PAGE_ACCESSED);
398 static inline pmd_t pmd_mkwrite(pmd_t pmd)
400 return pmd_set_flags(pmd, _PAGE_RW);
403 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
405 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
408 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
410 pudval_t v = native_pud_val(pud);
412 return native_make_pud(v | set);
415 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
417 pudval_t v = native_pud_val(pud);
419 return native_make_pud(v & ~clear);
422 static inline pud_t pud_mkold(pud_t pud)
424 return pud_clear_flags(pud, _PAGE_ACCESSED);
427 static inline pud_t pud_mkclean(pud_t pud)
429 return pud_clear_flags(pud, _PAGE_DIRTY);
432 static inline pud_t pud_wrprotect(pud_t pud)
434 return pud_clear_flags(pud, _PAGE_RW);
437 static inline pud_t pud_mkdirty(pud_t pud)
439 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
442 static inline pud_t pud_mkdevmap(pud_t pud)
444 return pud_set_flags(pud, _PAGE_DEVMAP);
447 static inline pud_t pud_mkhuge(pud_t pud)
449 return pud_set_flags(pud, _PAGE_PSE);
452 static inline pud_t pud_mkyoung(pud_t pud)
454 return pud_set_flags(pud, _PAGE_ACCESSED);
457 static inline pud_t pud_mkwrite(pud_t pud)
459 return pud_set_flags(pud, _PAGE_RW);
462 static inline pud_t pud_mknotpresent(pud_t pud)
464 return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE);
467 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
468 static inline int pte_soft_dirty(pte_t pte)
470 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
473 static inline int pmd_soft_dirty(pmd_t pmd)
475 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
478 static inline int pud_soft_dirty(pud_t pud)
480 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
483 static inline pte_t pte_mksoft_dirty(pte_t pte)
485 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
488 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
490 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
493 static inline pud_t pud_mksoft_dirty(pud_t pud)
495 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
498 static inline pte_t pte_clear_soft_dirty(pte_t pte)
500 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
503 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
505 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
508 static inline pud_t pud_clear_soft_dirty(pud_t pud)
510 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
513 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
516 * Mask out unsupported bits in a present pgprot. Non-present pgprots
517 * can use those bits for other purposes, so leave them be.
519 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
521 pgprotval_t protval = pgprot_val(pgprot);
523 if (protval & _PAGE_PRESENT)
524 protval &= __supported_pte_mask;
529 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
531 pgprotval_t massaged_val = massage_pgprot(pgprot);
533 /* mmdebug.h can not be included here because of dependencies */
534 #ifdef CONFIG_DEBUG_VM
535 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
536 "attempted to set unsupported pgprot: %016llx "
537 "bits: %016llx supported: %016llx\n",
538 (u64)pgprot_val(pgprot),
539 (u64)pgprot_val(pgprot) ^ massaged_val,
540 (u64)__supported_pte_mask);
546 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
548 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
549 check_pgprot(pgprot));
552 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
554 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
555 check_pgprot(pgprot));
558 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
560 return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) |
561 check_pgprot(pgprot));
564 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
566 pteval_t val = pte_val(pte);
569 * Chop off the NX bit (if present), and add the NX portion of
570 * the newprot (if present):
572 val &= _PAGE_CHG_MASK;
573 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
578 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
580 pmdval_t val = pmd_val(pmd);
582 val &= _HPAGE_CHG_MASK;
583 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
588 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
589 #define pgprot_modify pgprot_modify
590 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
592 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
593 pgprotval_t addbits = pgprot_val(newprot);
594 return __pgprot(preservebits | addbits);
597 #define pte_pgprot(x) __pgprot(pte_flags(x))
598 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
599 #define pud_pgprot(x) __pgprot(pud_flags(x))
600 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
602 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
604 static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
606 return canon_pgprot(prot);
609 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
610 enum page_cache_mode pcm,
611 enum page_cache_mode new_pcm)
614 * PAT type is always WB for untracked ranges, so no need to check.
616 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
620 * Certain new memtypes are not allowed with certain
622 * - request is uncached, return cannot be write-back
623 * - request is write-combine, return cannot be write-back
624 * - request is write-through, return cannot be write-back
625 * - request is write-through, return cannot be write-combine
627 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
628 new_pcm == _PAGE_CACHE_MODE_WB) ||
629 (pcm == _PAGE_CACHE_MODE_WC &&
630 new_pcm == _PAGE_CACHE_MODE_WB) ||
631 (pcm == _PAGE_CACHE_MODE_WT &&
632 new_pcm == _PAGE_CACHE_MODE_WB) ||
633 (pcm == _PAGE_CACHE_MODE_WT &&
634 new_pcm == _PAGE_CACHE_MODE_WC)) {
641 pmd_t *populate_extra_pmd(unsigned long vaddr);
642 pte_t *populate_extra_pte(unsigned long vaddr);
643 #endif /* __ASSEMBLY__ */
646 # include <asm/pgtable_32.h>
648 # include <asm/pgtable_64.h>
652 #include <linux/mm_types.h>
653 #include <linux/mmdebug.h>
654 #include <linux/log2.h>
655 #include <asm/fixmap.h>
657 static inline int pte_none(pte_t pte)
659 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
662 #define __HAVE_ARCH_PTE_SAME
663 static inline int pte_same(pte_t a, pte_t b)
665 return a.pte == b.pte;
668 static inline int pte_present(pte_t a)
670 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
673 #ifdef __HAVE_ARCH_PTE_DEVMAP
674 static inline int pte_devmap(pte_t a)
676 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
680 #define pte_accessible pte_accessible
681 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
683 if (pte_flags(a) & _PAGE_PRESENT)
686 if ((pte_flags(a) & _PAGE_PROTNONE) &&
687 mm_tlb_flush_pending(mm))
693 static inline int pmd_present(pmd_t pmd)
696 * Checking for _PAGE_PSE is needed too because
697 * split_huge_page will temporarily clear the present bit (but
698 * the _PAGE_PSE flag will remain set at all times while the
699 * _PAGE_PRESENT bit is clear).
701 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
704 #ifdef CONFIG_NUMA_BALANCING
706 * These work without NUMA balancing but the kernel does not care. See the
707 * comment in include/asm-generic/pgtable.h
709 static inline int pte_protnone(pte_t pte)
711 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
715 static inline int pmd_protnone(pmd_t pmd)
717 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
720 #endif /* CONFIG_NUMA_BALANCING */
722 static inline int pmd_none(pmd_t pmd)
724 /* Only check low word on 32-bit platforms, since it might be
725 out of sync with upper half. */
726 unsigned long val = native_pmd_val(pmd);
727 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
730 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
732 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
736 * Currently stuck as a macro due to indirect forward reference to
737 * linux/mmzone.h's __section_mem_map_addr() definition:
739 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
742 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
744 * this macro returns the index of the entry in the pmd page which would
745 * control the given virtual address
747 static inline unsigned long pmd_index(unsigned long address)
749 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
753 * Conversion functions: convert a page and protection to a page entry,
754 * and a page entry and page directory to the page they refer to.
756 * (Currently stuck as a macro because of indirect forward reference
757 * to linux/mm.h:page_to_nid())
759 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
762 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
764 * this function returns the index of the entry in the pte page which would
765 * control the given virtual address
767 static inline unsigned long pte_index(unsigned long address)
769 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
772 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
774 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
777 static inline int pmd_bad(pmd_t pmd)
779 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
782 static inline unsigned long pages_to_mb(unsigned long npg)
784 return npg >> (20 - PAGE_SHIFT);
787 #if CONFIG_PGTABLE_LEVELS > 2
788 static inline int pud_none(pud_t pud)
790 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
793 static inline int pud_present(pud_t pud)
795 return pud_flags(pud) & _PAGE_PRESENT;
798 static inline unsigned long pud_page_vaddr(pud_t pud)
800 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
804 * Currently stuck as a macro due to indirect forward reference to
805 * linux/mmzone.h's __section_mem_map_addr() definition:
807 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
809 /* Find an entry in the second-level page table.. */
810 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
812 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
815 static inline int pud_large(pud_t pud)
817 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
818 (_PAGE_PSE | _PAGE_PRESENT);
821 static inline int pud_bad(pud_t pud)
823 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
826 static inline int pud_large(pud_t pud)
830 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
832 static inline unsigned long pud_index(unsigned long address)
834 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
837 #if CONFIG_PGTABLE_LEVELS > 3
838 static inline int p4d_none(p4d_t p4d)
840 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
843 static inline int p4d_present(p4d_t p4d)
845 return p4d_flags(p4d) & _PAGE_PRESENT;
848 static inline unsigned long p4d_page_vaddr(p4d_t p4d)
850 return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
854 * Currently stuck as a macro due to indirect forward reference to
855 * linux/mmzone.h's __section_mem_map_addr() definition:
857 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
859 /* Find an entry in the third-level page table.. */
860 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
862 return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
865 static inline int p4d_bad(p4d_t p4d)
867 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
869 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
870 ignore_flags |= _PAGE_NX;
872 return (p4d_flags(p4d) & ~ignore_flags) != 0;
874 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
876 static inline unsigned long p4d_index(unsigned long address)
878 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
881 #if CONFIG_PGTABLE_LEVELS > 4
882 static inline int pgd_present(pgd_t pgd)
884 if (!pgtable_l5_enabled())
886 return pgd_flags(pgd) & _PAGE_PRESENT;
889 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
891 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
895 * Currently stuck as a macro due to indirect forward reference to
896 * linux/mmzone.h's __section_mem_map_addr() definition:
898 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
900 /* to find an entry in a page-table-directory. */
901 static __always_inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
903 if (!pgtable_l5_enabled())
905 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
908 static inline int pgd_bad(pgd_t pgd)
910 unsigned long ignore_flags = _PAGE_USER;
912 if (!pgtable_l5_enabled())
915 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
916 ignore_flags |= _PAGE_NX;
918 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
921 static inline int pgd_none(pgd_t pgd)
923 if (!pgtable_l5_enabled())
926 * There is no need to do a workaround for the KNL stray
927 * A/D bit erratum here. PGDs only point to page tables
928 * except on 32-bit non-PAE which is not supported on
931 return !native_pgd_val(pgd);
933 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
935 #endif /* __ASSEMBLY__ */
938 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
940 * this macro returns the index of the entry in the pgd page which would
941 * control the given virtual address
943 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
946 * pgd_offset() returns a (pgd_t *)
947 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
949 #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address)))
951 * a shortcut to get a pgd_t in a given mm
953 #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address))
955 * a shortcut which implies the use of the kernel's pgd, instead
958 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
961 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
962 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
966 extern int direct_gbpages;
967 void init_mem_mapping(void);
968 void early_alloc_pgt_buf(void);
969 extern void memblock_find_dma_reserve(void);
972 /* Realmode trampoline initialization. */
973 extern pgd_t trampoline_pgd_entry;
974 static inline void __meminit init_trampoline_default(void)
976 /* Default trampoline pgd value */
977 trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)];
979 # ifdef CONFIG_RANDOMIZE_MEMORY
980 void __meminit init_trampoline(void);
982 # define init_trampoline init_trampoline_default
985 static inline void init_trampoline(void) { }
988 /* local pte updates need not use xchg for locking */
989 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
993 /* Pure native function needs no input for mm, addr */
994 native_pte_clear(NULL, 0, ptep);
998 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
1002 native_pmd_clear(pmdp);
1006 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1010 native_pud_clear(pudp);
1014 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
1015 pte_t *ptep , pte_t pte)
1017 native_set_pte(ptep, pte);
1020 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1021 pmd_t *pmdp, pmd_t pmd)
1023 native_set_pmd(pmdp, pmd);
1026 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1027 pud_t *pudp, pud_t pud)
1029 native_set_pud(pudp, pud);
1033 * We only update the dirty/accessed state if we set
1034 * the dirty bit by hand in the kernel, since the hardware
1035 * will do the accessed bit for us, and we don't want to
1036 * race with other CPU's that might be updating the dirty
1037 * bit at the same time.
1039 struct vm_area_struct;
1041 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1042 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1043 unsigned long address, pte_t *ptep,
1044 pte_t entry, int dirty);
1046 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1047 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1048 unsigned long addr, pte_t *ptep);
1050 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1051 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1052 unsigned long address, pte_t *ptep);
1054 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1055 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1058 pte_t pte = native_ptep_get_and_clear(ptep);
1062 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1063 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1064 unsigned long addr, pte_t *ptep,
1070 * Full address destruction in progress; paravirt does not
1071 * care about updates and native needs no locking
1073 pte = native_local_ptep_get_and_clear(ptep);
1075 pte = ptep_get_and_clear(mm, addr, ptep);
1080 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1081 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1082 unsigned long addr, pte_t *ptep)
1084 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1087 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1089 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1091 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1092 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1093 unsigned long address, pmd_t *pmdp,
1094 pmd_t entry, int dirty);
1095 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1096 unsigned long address, pud_t *pudp,
1097 pud_t entry, int dirty);
1099 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1100 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1101 unsigned long addr, pmd_t *pmdp);
1102 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1103 unsigned long addr, pud_t *pudp);
1105 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1106 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1107 unsigned long address, pmd_t *pmdp);
1110 #define pmd_write pmd_write
1111 static inline int pmd_write(pmd_t pmd)
1113 return pmd_flags(pmd) & _PAGE_RW;
1116 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1117 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1120 return native_pmdp_get_and_clear(pmdp);
1123 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1124 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1125 unsigned long addr, pud_t *pudp)
1127 return native_pudp_get_and_clear(pudp);
1130 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1131 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1132 unsigned long addr, pmd_t *pmdp)
1134 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1137 #define pud_write pud_write
1138 static inline int pud_write(pud_t pud)
1140 return pud_flags(pud) & _PAGE_RW;
1143 #ifndef pmdp_establish
1144 #define pmdp_establish pmdp_establish
1145 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1146 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1148 if (IS_ENABLED(CONFIG_SMP)) {
1149 return xchg(pmdp, pmd);
1159 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1161 * dst - pointer to pgd range anwhere on a pgd page
1163 * count - the number of pgds to copy.
1165 * dst and src can be on the same page, but the range must not overlap,
1166 * and must not cross a page boundary.
1168 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1170 memcpy(dst, src, count * sizeof(pgd_t));
1171 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1172 if (!static_cpu_has(X86_FEATURE_PTI))
1174 /* Clone the user space pgd as well */
1175 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1176 count * sizeof(pgd_t));
1180 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1181 static inline int page_level_shift(enum pg_level level)
1183 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1185 static inline unsigned long page_level_size(enum pg_level level)
1187 return 1UL << page_level_shift(level);
1189 static inline unsigned long page_level_mask(enum pg_level level)
1191 return ~(page_level_size(level) - 1);
1195 * The x86 doesn't have any external MMU info: the kernel page
1196 * tables contain all the necessary information.
1198 static inline void update_mmu_cache(struct vm_area_struct *vma,
1199 unsigned long addr, pte_t *ptep)
1202 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1203 unsigned long addr, pmd_t *pmd)
1206 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1207 unsigned long addr, pud_t *pud)
1211 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1212 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1214 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1217 static inline int pte_swp_soft_dirty(pte_t pte)
1219 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1222 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1224 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1227 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1228 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1230 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1233 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1235 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1238 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1240 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1245 #define PKRU_AD_BIT 0x1
1246 #define PKRU_WD_BIT 0x2
1247 #define PKRU_BITS_PER_PKEY 2
1249 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
1251 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1252 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
1255 static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
1257 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1259 * Access-disable disables writes too so we need to check
1262 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
1265 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1267 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1268 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1269 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1275 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1277 u32 pkru = read_pkru();
1279 if (!__pkru_allows_read(pkru, pkey))
1281 if (write && !__pkru_allows_write(pkru, pkey))
1288 * 'pteval' can come from a PTE, PMD or PUD. We only check
1289 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1290 * same value on all 3 types.
1292 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1294 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1297 need_pte_bits |= _PAGE_RW;
1299 if ((pteval & need_pte_bits) != need_pte_bits)
1302 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1305 #define pte_access_permitted pte_access_permitted
1306 static inline bool pte_access_permitted(pte_t pte, bool write)
1308 return __pte_access_permitted(pte_val(pte), write);
1311 #define pmd_access_permitted pmd_access_permitted
1312 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1314 return __pte_access_permitted(pmd_val(pmd), write);
1317 #define pud_access_permitted pud_access_permitted
1318 static inline bool pud_access_permitted(pud_t pud, bool write)
1320 return __pte_access_permitted(pud_val(pud), write);
1323 #include <asm-generic/pgtable.h>
1324 #endif /* __ASSEMBLY__ */
1326 #endif /* _ASM_X86_PGTABLE_H */