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);
33 void ptdump_walk_user_pgd_level_checkwx(void);
35 #ifdef CONFIG_DEBUG_WX
36 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
37 #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
39 #define debug_checkwx() do { } while (0)
40 #define debug_checkwx_user() do { } while (0)
44 * ZERO_PAGE is a global shared page that is always zero: used
45 * for zero-mapped memory areas etc..
47 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
49 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
51 extern spinlock_t pgd_lock;
52 extern struct list_head pgd_list;
54 extern struct mm_struct *pgd_page_get_mm(struct page *page);
56 extern pmdval_t early_pmd_flags;
58 #ifdef CONFIG_PARAVIRT
59 #include <asm/paravirt.h>
60 #else /* !CONFIG_PARAVIRT */
61 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
62 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
64 #define set_pte_atomic(ptep, pte) \
65 native_set_pte_atomic(ptep, pte)
67 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
69 #ifndef __PAGETABLE_P4D_FOLDED
70 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
71 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
75 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
78 #ifndef __PAGETABLE_PUD_FOLDED
79 #define p4d_clear(p4d) native_p4d_clear(p4d)
83 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
86 #ifndef __PAGETABLE_PUD_FOLDED
87 #define pud_clear(pud) native_pud_clear(pud)
90 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
91 #define pmd_clear(pmd) native_pmd_clear(pmd)
93 #define pgd_val(x) native_pgd_val(x)
94 #define __pgd(x) native_make_pgd(x)
96 #ifndef __PAGETABLE_P4D_FOLDED
97 #define p4d_val(x) native_p4d_val(x)
98 #define __p4d(x) native_make_p4d(x)
101 #ifndef __PAGETABLE_PUD_FOLDED
102 #define pud_val(x) native_pud_val(x)
103 #define __pud(x) native_make_pud(x)
106 #ifndef __PAGETABLE_PMD_FOLDED
107 #define pmd_val(x) native_pmd_val(x)
108 #define __pmd(x) native_make_pmd(x)
111 #define pte_val(x) native_pte_val(x)
112 #define __pte(x) native_make_pte(x)
114 #define arch_end_context_switch(prev) do {} while(0)
116 #endif /* CONFIG_PARAVIRT */
119 * The following only work if pte_present() is true.
120 * Undefined behaviour if not..
122 static inline int pte_dirty(pte_t pte)
124 return pte_flags(pte) & _PAGE_DIRTY;
128 static inline u32 read_pkru(void)
130 if (boot_cpu_has(X86_FEATURE_OSPKE))
131 return __read_pkru();
135 static inline void write_pkru(u32 pkru)
137 if (boot_cpu_has(X86_FEATURE_OSPKE))
141 static inline int pte_young(pte_t pte)
143 return pte_flags(pte) & _PAGE_ACCESSED;
146 static inline int pmd_dirty(pmd_t pmd)
148 return pmd_flags(pmd) & _PAGE_DIRTY;
151 static inline int pmd_young(pmd_t pmd)
153 return pmd_flags(pmd) & _PAGE_ACCESSED;
156 static inline int pud_dirty(pud_t pud)
158 return pud_flags(pud) & _PAGE_DIRTY;
161 static inline int pud_young(pud_t pud)
163 return pud_flags(pud) & _PAGE_ACCESSED;
166 static inline int pte_write(pte_t pte)
168 return pte_flags(pte) & _PAGE_RW;
171 static inline int pte_huge(pte_t pte)
173 return pte_flags(pte) & _PAGE_PSE;
176 static inline int pte_global(pte_t pte)
178 return pte_flags(pte) & _PAGE_GLOBAL;
181 static inline int pte_exec(pte_t pte)
183 return !(pte_flags(pte) & _PAGE_NX);
186 static inline int pte_special(pte_t pte)
188 return pte_flags(pte) & _PAGE_SPECIAL;
191 static inline unsigned long pte_pfn(pte_t pte)
193 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
196 static inline unsigned long pmd_pfn(pmd_t pmd)
198 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
201 static inline unsigned long pud_pfn(pud_t pud)
203 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
206 static inline unsigned long p4d_pfn(p4d_t p4d)
208 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
211 static inline unsigned long pgd_pfn(pgd_t pgd)
213 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
216 static inline int p4d_large(p4d_t p4d)
218 /* No 512 GiB pages yet */
222 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
224 static inline int pmd_large(pmd_t pte)
226 return pmd_flags(pte) & _PAGE_PSE;
229 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
230 static inline int pmd_trans_huge(pmd_t pmd)
232 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
235 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
236 static inline int pud_trans_huge(pud_t pud)
238 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
242 #define has_transparent_hugepage has_transparent_hugepage
243 static inline int has_transparent_hugepage(void)
245 return boot_cpu_has(X86_FEATURE_PSE);
248 #ifdef __HAVE_ARCH_PTE_DEVMAP
249 static inline int pmd_devmap(pmd_t pmd)
251 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
254 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
255 static inline int pud_devmap(pud_t pud)
257 return !!(pud_val(pud) & _PAGE_DEVMAP);
260 static inline int pud_devmap(pud_t pud)
266 static inline int pgd_devmap(pgd_t pgd)
271 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
273 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
275 pteval_t v = native_pte_val(pte);
277 return native_make_pte(v | set);
280 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
282 pteval_t v = native_pte_val(pte);
284 return native_make_pte(v & ~clear);
287 static inline pte_t pte_mkclean(pte_t pte)
289 return pte_clear_flags(pte, _PAGE_DIRTY);
292 static inline pte_t pte_mkold(pte_t pte)
294 return pte_clear_flags(pte, _PAGE_ACCESSED);
297 static inline pte_t pte_wrprotect(pte_t pte)
299 return pte_clear_flags(pte, _PAGE_RW);
302 static inline pte_t pte_mkexec(pte_t pte)
304 return pte_clear_flags(pte, _PAGE_NX);
307 static inline pte_t pte_mkdirty(pte_t pte)
309 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
312 static inline pte_t pte_mkyoung(pte_t pte)
314 return pte_set_flags(pte, _PAGE_ACCESSED);
317 static inline pte_t pte_mkwrite(pte_t pte)
319 return pte_set_flags(pte, _PAGE_RW);
322 static inline pte_t pte_mkhuge(pte_t pte)
324 return pte_set_flags(pte, _PAGE_PSE);
327 static inline pte_t pte_clrhuge(pte_t pte)
329 return pte_clear_flags(pte, _PAGE_PSE);
332 static inline pte_t pte_mkglobal(pte_t pte)
334 return pte_set_flags(pte, _PAGE_GLOBAL);
337 static inline pte_t pte_clrglobal(pte_t pte)
339 return pte_clear_flags(pte, _PAGE_GLOBAL);
342 static inline pte_t pte_mkspecial(pte_t pte)
344 return pte_set_flags(pte, _PAGE_SPECIAL);
347 static inline pte_t pte_mkdevmap(pte_t pte)
349 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
352 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
354 pmdval_t v = native_pmd_val(pmd);
356 return native_make_pmd(v | set);
359 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
361 pmdval_t v = native_pmd_val(pmd);
363 return native_make_pmd(v & ~clear);
366 static inline pmd_t pmd_mkold(pmd_t pmd)
368 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
371 static inline pmd_t pmd_mkclean(pmd_t pmd)
373 return pmd_clear_flags(pmd, _PAGE_DIRTY);
376 static inline pmd_t pmd_wrprotect(pmd_t pmd)
378 return pmd_clear_flags(pmd, _PAGE_RW);
381 static inline pmd_t pmd_mkdirty(pmd_t pmd)
383 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
386 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
388 return pmd_set_flags(pmd, _PAGE_DEVMAP);
391 static inline pmd_t pmd_mkhuge(pmd_t pmd)
393 return pmd_set_flags(pmd, _PAGE_PSE);
396 static inline pmd_t pmd_mkyoung(pmd_t pmd)
398 return pmd_set_flags(pmd, _PAGE_ACCESSED);
401 static inline pmd_t pmd_mkwrite(pmd_t pmd)
403 return pmd_set_flags(pmd, _PAGE_RW);
406 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
408 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
411 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
413 pudval_t v = native_pud_val(pud);
415 return native_make_pud(v | set);
418 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
420 pudval_t v = native_pud_val(pud);
422 return native_make_pud(v & ~clear);
425 static inline pud_t pud_mkold(pud_t pud)
427 return pud_clear_flags(pud, _PAGE_ACCESSED);
430 static inline pud_t pud_mkclean(pud_t pud)
432 return pud_clear_flags(pud, _PAGE_DIRTY);
435 static inline pud_t pud_wrprotect(pud_t pud)
437 return pud_clear_flags(pud, _PAGE_RW);
440 static inline pud_t pud_mkdirty(pud_t pud)
442 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
445 static inline pud_t pud_mkdevmap(pud_t pud)
447 return pud_set_flags(pud, _PAGE_DEVMAP);
450 static inline pud_t pud_mkhuge(pud_t pud)
452 return pud_set_flags(pud, _PAGE_PSE);
455 static inline pud_t pud_mkyoung(pud_t pud)
457 return pud_set_flags(pud, _PAGE_ACCESSED);
460 static inline pud_t pud_mkwrite(pud_t pud)
462 return pud_set_flags(pud, _PAGE_RW);
465 static inline pud_t pud_mknotpresent(pud_t pud)
467 return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE);
470 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
471 static inline int pte_soft_dirty(pte_t pte)
473 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
476 static inline int pmd_soft_dirty(pmd_t pmd)
478 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
481 static inline int pud_soft_dirty(pud_t pud)
483 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
486 static inline pte_t pte_mksoft_dirty(pte_t pte)
488 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
491 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
493 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
496 static inline pud_t pud_mksoft_dirty(pud_t pud)
498 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
501 static inline pte_t pte_clear_soft_dirty(pte_t pte)
503 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
506 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
508 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
511 static inline pud_t pud_clear_soft_dirty(pud_t pud)
513 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
516 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
519 * Mask out unsupported bits in a present pgprot. Non-present pgprots
520 * can use those bits for other purposes, so leave them be.
522 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
524 pgprotval_t protval = pgprot_val(pgprot);
526 if (protval & _PAGE_PRESENT)
527 protval &= __supported_pte_mask;
532 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
534 pgprotval_t massaged_val = massage_pgprot(pgprot);
536 /* mmdebug.h can not be included here because of dependencies */
537 #ifdef CONFIG_DEBUG_VM
538 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
539 "attempted to set unsupported pgprot: %016llx "
540 "bits: %016llx supported: %016llx\n",
541 (u64)pgprot_val(pgprot),
542 (u64)pgprot_val(pgprot) ^ massaged_val,
543 (u64)__supported_pte_mask);
549 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
551 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
552 check_pgprot(pgprot));
555 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
557 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
558 check_pgprot(pgprot));
561 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
563 return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) |
564 check_pgprot(pgprot));
567 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
569 pteval_t val = pte_val(pte);
572 * Chop off the NX bit (if present), and add the NX portion of
573 * the newprot (if present):
575 val &= _PAGE_CHG_MASK;
576 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
581 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
583 pmdval_t val = pmd_val(pmd);
585 val &= _HPAGE_CHG_MASK;
586 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
591 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
592 #define pgprot_modify pgprot_modify
593 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
595 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
596 pgprotval_t addbits = pgprot_val(newprot);
597 return __pgprot(preservebits | addbits);
600 #define pte_pgprot(x) __pgprot(pte_flags(x))
601 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
602 #define pud_pgprot(x) __pgprot(pud_flags(x))
603 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
605 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
607 static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
609 return canon_pgprot(prot);
612 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
613 enum page_cache_mode pcm,
614 enum page_cache_mode new_pcm)
617 * PAT type is always WB for untracked ranges, so no need to check.
619 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
623 * Certain new memtypes are not allowed with certain
625 * - request is uncached, return cannot be write-back
626 * - request is write-combine, return cannot be write-back
627 * - request is write-through, return cannot be write-back
628 * - request is write-through, return cannot be write-combine
630 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
631 new_pcm == _PAGE_CACHE_MODE_WB) ||
632 (pcm == _PAGE_CACHE_MODE_WC &&
633 new_pcm == _PAGE_CACHE_MODE_WB) ||
634 (pcm == _PAGE_CACHE_MODE_WT &&
635 new_pcm == _PAGE_CACHE_MODE_WB) ||
636 (pcm == _PAGE_CACHE_MODE_WT &&
637 new_pcm == _PAGE_CACHE_MODE_WC)) {
644 pmd_t *populate_extra_pmd(unsigned long vaddr);
645 pte_t *populate_extra_pte(unsigned long vaddr);
647 #ifdef CONFIG_PAGE_TABLE_ISOLATION
648 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
651 * Take a PGD location (pgdp) and a pgd value that needs to be set there.
652 * Populates the user and returns the resulting PGD that must be set in
653 * the kernel copy of the page tables.
655 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
657 if (!static_cpu_has(X86_FEATURE_PTI))
659 return __pti_set_user_pgtbl(pgdp, pgd);
661 #else /* CONFIG_PAGE_TABLE_ISOLATION */
662 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
666 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
668 #endif /* __ASSEMBLY__ */
672 # include <asm/pgtable_32.h>
674 # include <asm/pgtable_64.h>
678 #include <linux/mm_types.h>
679 #include <linux/mmdebug.h>
680 #include <linux/log2.h>
681 #include <asm/fixmap.h>
683 static inline int pte_none(pte_t pte)
685 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
688 #define __HAVE_ARCH_PTE_SAME
689 static inline int pte_same(pte_t a, pte_t b)
691 return a.pte == b.pte;
694 static inline int pte_present(pte_t a)
696 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
699 #ifdef __HAVE_ARCH_PTE_DEVMAP
700 static inline int pte_devmap(pte_t a)
702 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
706 #define pte_accessible pte_accessible
707 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
709 if (pte_flags(a) & _PAGE_PRESENT)
712 if ((pte_flags(a) & _PAGE_PROTNONE) &&
713 mm_tlb_flush_pending(mm))
719 static inline int pmd_present(pmd_t pmd)
722 * Checking for _PAGE_PSE is needed too because
723 * split_huge_page will temporarily clear the present bit (but
724 * the _PAGE_PSE flag will remain set at all times while the
725 * _PAGE_PRESENT bit is clear).
727 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
730 #ifdef CONFIG_NUMA_BALANCING
732 * These work without NUMA balancing but the kernel does not care. See the
733 * comment in include/asm-generic/pgtable.h
735 static inline int pte_protnone(pte_t pte)
737 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
741 static inline int pmd_protnone(pmd_t pmd)
743 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
746 #endif /* CONFIG_NUMA_BALANCING */
748 static inline int pmd_none(pmd_t pmd)
750 /* Only check low word on 32-bit platforms, since it might be
751 out of sync with upper half. */
752 unsigned long val = native_pmd_val(pmd);
753 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
756 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
758 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
762 * Currently stuck as a macro due to indirect forward reference to
763 * linux/mmzone.h's __section_mem_map_addr() definition:
765 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
768 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
770 * this macro returns the index of the entry in the pmd page which would
771 * control the given virtual address
773 static inline unsigned long pmd_index(unsigned long address)
775 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
779 * Conversion functions: convert a page and protection to a page entry,
780 * and a page entry and page directory to the page they refer to.
782 * (Currently stuck as a macro because of indirect forward reference
783 * to linux/mm.h:page_to_nid())
785 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
788 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
790 * this function returns the index of the entry in the pte page which would
791 * control the given virtual address
793 static inline unsigned long pte_index(unsigned long address)
795 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
798 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
800 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
803 static inline int pmd_bad(pmd_t pmd)
805 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
808 static inline unsigned long pages_to_mb(unsigned long npg)
810 return npg >> (20 - PAGE_SHIFT);
813 #if CONFIG_PGTABLE_LEVELS > 2
814 static inline int pud_none(pud_t pud)
816 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
819 static inline int pud_present(pud_t pud)
821 return pud_flags(pud) & _PAGE_PRESENT;
824 static inline unsigned long pud_page_vaddr(pud_t pud)
826 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
830 * Currently stuck as a macro due to indirect forward reference to
831 * linux/mmzone.h's __section_mem_map_addr() definition:
833 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
835 /* Find an entry in the second-level page table.. */
836 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
838 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
841 static inline int pud_large(pud_t pud)
843 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
844 (_PAGE_PSE | _PAGE_PRESENT);
847 static inline int pud_bad(pud_t pud)
849 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
852 static inline int pud_large(pud_t pud)
856 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
858 static inline unsigned long pud_index(unsigned long address)
860 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
863 #if CONFIG_PGTABLE_LEVELS > 3
864 static inline int p4d_none(p4d_t p4d)
866 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
869 static inline int p4d_present(p4d_t p4d)
871 return p4d_flags(p4d) & _PAGE_PRESENT;
874 static inline unsigned long p4d_page_vaddr(p4d_t p4d)
876 return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
880 * Currently stuck as a macro due to indirect forward reference to
881 * linux/mmzone.h's __section_mem_map_addr() definition:
883 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
885 /* Find an entry in the third-level page table.. */
886 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
888 return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
891 static inline int p4d_bad(p4d_t p4d)
893 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
895 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
896 ignore_flags |= _PAGE_NX;
898 return (p4d_flags(p4d) & ~ignore_flags) != 0;
900 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
902 static inline unsigned long p4d_index(unsigned long address)
904 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
907 #if CONFIG_PGTABLE_LEVELS > 4
908 static inline int pgd_present(pgd_t pgd)
910 if (!pgtable_l5_enabled())
912 return pgd_flags(pgd) & _PAGE_PRESENT;
915 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
917 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
921 * Currently stuck as a macro due to indirect forward reference to
922 * linux/mmzone.h's __section_mem_map_addr() definition:
924 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
926 /* to find an entry in a page-table-directory. */
927 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
929 if (!pgtable_l5_enabled())
931 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
934 static inline int pgd_bad(pgd_t pgd)
936 unsigned long ignore_flags = _PAGE_USER;
938 if (!pgtable_l5_enabled())
941 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
942 ignore_flags |= _PAGE_NX;
944 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
947 static inline int pgd_none(pgd_t pgd)
949 if (!pgtable_l5_enabled())
952 * There is no need to do a workaround for the KNL stray
953 * A/D bit erratum here. PGDs only point to page tables
954 * except on 32-bit non-PAE which is not supported on
957 return !native_pgd_val(pgd);
959 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
961 #endif /* __ASSEMBLY__ */
964 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
966 * this macro returns the index of the entry in the pgd page which would
967 * control the given virtual address
969 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
972 * pgd_offset() returns a (pgd_t *)
973 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
975 #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address)))
977 * a shortcut to get a pgd_t in a given mm
979 #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address))
981 * a shortcut which implies the use of the kernel's pgd, instead
984 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
987 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
988 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
992 extern int direct_gbpages;
993 void init_mem_mapping(void);
994 void early_alloc_pgt_buf(void);
995 extern void memblock_find_dma_reserve(void);
998 /* Realmode trampoline initialization. */
999 extern pgd_t trampoline_pgd_entry;
1000 static inline void __meminit init_trampoline_default(void)
1002 /* Default trampoline pgd value */
1003 trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)];
1005 # ifdef CONFIG_RANDOMIZE_MEMORY
1006 void __meminit init_trampoline(void);
1008 # define init_trampoline init_trampoline_default
1011 static inline void init_trampoline(void) { }
1014 /* local pte updates need not use xchg for locking */
1015 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
1019 /* Pure native function needs no input for mm, addr */
1020 native_pte_clear(NULL, 0, ptep);
1024 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
1028 native_pmd_clear(pmdp);
1032 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1036 native_pud_clear(pudp);
1040 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
1041 pte_t *ptep , pte_t pte)
1043 native_set_pte(ptep, pte);
1046 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1047 pmd_t *pmdp, pmd_t pmd)
1049 native_set_pmd(pmdp, pmd);
1052 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1053 pud_t *pudp, pud_t pud)
1055 native_set_pud(pudp, pud);
1059 * We only update the dirty/accessed state if we set
1060 * the dirty bit by hand in the kernel, since the hardware
1061 * will do the accessed bit for us, and we don't want to
1062 * race with other CPU's that might be updating the dirty
1063 * bit at the same time.
1065 struct vm_area_struct;
1067 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1068 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1069 unsigned long address, pte_t *ptep,
1070 pte_t entry, int dirty);
1072 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1073 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1074 unsigned long addr, pte_t *ptep);
1076 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1077 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1078 unsigned long address, pte_t *ptep);
1080 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1081 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1084 pte_t pte = native_ptep_get_and_clear(ptep);
1088 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1089 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1090 unsigned long addr, pte_t *ptep,
1096 * Full address destruction in progress; paravirt does not
1097 * care about updates and native needs no locking
1099 pte = native_local_ptep_get_and_clear(ptep);
1101 pte = ptep_get_and_clear(mm, addr, ptep);
1106 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1107 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1108 unsigned long addr, pte_t *ptep)
1110 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1113 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1115 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1117 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1118 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1119 unsigned long address, pmd_t *pmdp,
1120 pmd_t entry, int dirty);
1121 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1122 unsigned long address, pud_t *pudp,
1123 pud_t entry, int dirty);
1125 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1126 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1127 unsigned long addr, pmd_t *pmdp);
1128 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1129 unsigned long addr, pud_t *pudp);
1131 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1132 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1133 unsigned long address, pmd_t *pmdp);
1136 #define pmd_write pmd_write
1137 static inline int pmd_write(pmd_t pmd)
1139 return pmd_flags(pmd) & _PAGE_RW;
1142 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1143 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1146 return native_pmdp_get_and_clear(pmdp);
1149 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1150 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1151 unsigned long addr, pud_t *pudp)
1153 return native_pudp_get_and_clear(pudp);
1156 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1157 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1158 unsigned long addr, pmd_t *pmdp)
1160 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1163 #define pud_write pud_write
1164 static inline int pud_write(pud_t pud)
1166 return pud_flags(pud) & _PAGE_RW;
1169 #ifndef pmdp_establish
1170 #define pmdp_establish pmdp_establish
1171 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1172 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1174 if (IS_ENABLED(CONFIG_SMP)) {
1175 return xchg(pmdp, pmd);
1184 * Page table pages are page-aligned. The lower half of the top
1185 * level is used for userspace and the top half for the kernel.
1187 * Returns true for parts of the PGD that map userspace and
1188 * false for the parts that map the kernel.
1190 static inline bool pgdp_maps_userspace(void *__ptr)
1192 unsigned long ptr = (unsigned long)__ptr;
1194 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1197 static inline int pgd_large(pgd_t pgd) { return 0; }
1199 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1201 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1202 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1203 * the user one is in the last 4k. To switch between them, you
1204 * just need to flip the 12th bit in their addresses.
1206 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1209 * This generates better code than the inline assembly in
1212 static inline void *ptr_set_bit(void *ptr, int bit)
1214 unsigned long __ptr = (unsigned long)ptr;
1217 return (void *)__ptr;
1219 static inline void *ptr_clear_bit(void *ptr, int bit)
1221 unsigned long __ptr = (unsigned long)ptr;
1224 return (void *)__ptr;
1227 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1229 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1232 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1234 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1237 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1239 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1242 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1244 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1246 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1249 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1251 * dst - pointer to pgd range anwhere on a pgd page
1253 * count - the number of pgds to copy.
1255 * dst and src can be on the same page, but the range must not overlap,
1256 * and must not cross a page boundary.
1258 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1260 memcpy(dst, src, count * sizeof(pgd_t));
1261 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1262 if (!static_cpu_has(X86_FEATURE_PTI))
1264 /* Clone the user space pgd as well */
1265 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1266 count * sizeof(pgd_t));
1270 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1271 static inline int page_level_shift(enum pg_level level)
1273 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1275 static inline unsigned long page_level_size(enum pg_level level)
1277 return 1UL << page_level_shift(level);
1279 static inline unsigned long page_level_mask(enum pg_level level)
1281 return ~(page_level_size(level) - 1);
1285 * The x86 doesn't have any external MMU info: the kernel page
1286 * tables contain all the necessary information.
1288 static inline void update_mmu_cache(struct vm_area_struct *vma,
1289 unsigned long addr, pte_t *ptep)
1292 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1293 unsigned long addr, pmd_t *pmd)
1296 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1297 unsigned long addr, pud_t *pud)
1301 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1302 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1304 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1307 static inline int pte_swp_soft_dirty(pte_t pte)
1309 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1312 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1314 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1317 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1318 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1320 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1323 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1325 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1328 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1330 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1335 #define PKRU_AD_BIT 0x1
1336 #define PKRU_WD_BIT 0x2
1337 #define PKRU_BITS_PER_PKEY 2
1339 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
1341 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1342 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
1345 static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
1347 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1349 * Access-disable disables writes too so we need to check
1352 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
1355 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1357 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1358 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1359 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1365 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1367 u32 pkru = read_pkru();
1369 if (!__pkru_allows_read(pkru, pkey))
1371 if (write && !__pkru_allows_write(pkru, pkey))
1378 * 'pteval' can come from a PTE, PMD or PUD. We only check
1379 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1380 * same value on all 3 types.
1382 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1384 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1387 need_pte_bits |= _PAGE_RW;
1389 if ((pteval & need_pte_bits) != need_pte_bits)
1392 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1395 #define pte_access_permitted pte_access_permitted
1396 static inline bool pte_access_permitted(pte_t pte, bool write)
1398 return __pte_access_permitted(pte_val(pte), write);
1401 #define pmd_access_permitted pmd_access_permitted
1402 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1404 return __pte_access_permitted(pmd_val(pmd), write);
1407 #define pud_access_permitted pud_access_permitted
1408 static inline bool pud_access_permitted(pud_t pud, bool write)
1410 return __pte_access_permitted(pud_val(pud), write);
1413 #include <asm-generic/pgtable.h>
1414 #endif /* __ASSEMBLY__ */
1416 #endif /* _ASM_X86_PGTABLE_H */