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) native_pgd_clear(pgd)
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 __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 __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 __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 __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 pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
531 return __pte(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
532 massage_pgprot(pgprot
));
535 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
537 return __pmd(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
538 massage_pgprot(pgprot
));
541 static inline pud_t
pfn_pud(unsigned long page_nr
, pgprot_t pgprot
)
543 return __pud(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
544 massage_pgprot(pgprot
));
547 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
549 pteval_t val
= pte_val(pte
);
552 * Chop off the NX bit (if present), and add the NX portion of
553 * the newprot (if present):
555 val
&= _PAGE_CHG_MASK
;
556 val
|= massage_pgprot(newprot
) & ~_PAGE_CHG_MASK
;
561 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
563 pmdval_t val
= pmd_val(pmd
);
565 val
&= _HPAGE_CHG_MASK
;
566 val
|= massage_pgprot(newprot
) & ~_HPAGE_CHG_MASK
;
571 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
572 #define pgprot_modify pgprot_modify
573 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
575 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
576 pgprotval_t addbits
= pgprot_val(newprot
);
577 return __pgprot(preservebits
| addbits
);
580 #define pte_pgprot(x) __pgprot(pte_flags(x))
581 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
582 #define pud_pgprot(x) __pgprot(pud_flags(x))
583 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
585 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
587 static inline int is_new_memtype_allowed(u64 paddr
, unsigned long size
,
588 enum page_cache_mode pcm
,
589 enum page_cache_mode new_pcm
)
592 * PAT type is always WB for untracked ranges, so no need to check.
594 if (x86_platform
.is_untracked_pat_range(paddr
, paddr
+ size
))
598 * Certain new memtypes are not allowed with certain
600 * - request is uncached, return cannot be write-back
601 * - request is write-combine, return cannot be write-back
602 * - request is write-through, return cannot be write-back
603 * - request is write-through, return cannot be write-combine
605 if ((pcm
== _PAGE_CACHE_MODE_UC_MINUS
&&
606 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
607 (pcm
== _PAGE_CACHE_MODE_WC
&&
608 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
609 (pcm
== _PAGE_CACHE_MODE_WT
&&
610 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
611 (pcm
== _PAGE_CACHE_MODE_WT
&&
612 new_pcm
== _PAGE_CACHE_MODE_WC
)) {
619 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
620 pte_t
*populate_extra_pte(unsigned long vaddr
);
621 #endif /* __ASSEMBLY__ */
624 # include <asm/pgtable_32.h>
626 # include <asm/pgtable_64.h>
630 #include <linux/mm_types.h>
631 #include <linux/mmdebug.h>
632 #include <linux/log2.h>
633 #include <asm/fixmap.h>
635 static inline int pte_none(pte_t pte
)
637 return !(pte
.pte
& ~(_PAGE_KNL_ERRATUM_MASK
));
640 #define __HAVE_ARCH_PTE_SAME
641 static inline int pte_same(pte_t a
, pte_t b
)
643 return a
.pte
== b
.pte
;
646 static inline int pte_present(pte_t a
)
648 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
);
651 #ifdef __HAVE_ARCH_PTE_DEVMAP
652 static inline int pte_devmap(pte_t a
)
654 return (pte_flags(a
) & _PAGE_DEVMAP
) == _PAGE_DEVMAP
;
658 #define pte_accessible pte_accessible
659 static inline bool pte_accessible(struct mm_struct
*mm
, pte_t a
)
661 if (pte_flags(a
) & _PAGE_PRESENT
)
664 if ((pte_flags(a
) & _PAGE_PROTNONE
) &&
665 mm_tlb_flush_pending(mm
))
671 static inline int pte_hidden(pte_t pte
)
673 return pte_flags(pte
) & _PAGE_HIDDEN
;
676 static inline int pmd_present(pmd_t pmd
)
679 * Checking for _PAGE_PSE is needed too because
680 * split_huge_page will temporarily clear the present bit (but
681 * the _PAGE_PSE flag will remain set at all times while the
682 * _PAGE_PRESENT bit is clear).
684 return pmd_flags(pmd
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
| _PAGE_PSE
);
687 #ifdef CONFIG_NUMA_BALANCING
689 * These work without NUMA balancing but the kernel does not care. See the
690 * comment in include/asm-generic/pgtable.h
692 static inline int pte_protnone(pte_t pte
)
694 return (pte_flags(pte
) & (_PAGE_PROTNONE
| _PAGE_PRESENT
))
698 static inline int pmd_protnone(pmd_t pmd
)
700 return (pmd_flags(pmd
) & (_PAGE_PROTNONE
| _PAGE_PRESENT
))
703 #endif /* CONFIG_NUMA_BALANCING */
705 static inline int pmd_none(pmd_t pmd
)
707 /* Only check low word on 32-bit platforms, since it might be
708 out of sync with upper half. */
709 unsigned long val
= native_pmd_val(pmd
);
710 return (val
& ~_PAGE_KNL_ERRATUM_MASK
) == 0;
713 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
715 return (unsigned long)__va(pmd_val(pmd
) & pmd_pfn_mask(pmd
));
719 * Currently stuck as a macro due to indirect forward reference to
720 * linux/mmzone.h's __section_mem_map_addr() definition:
722 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
725 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
727 * this macro returns the index of the entry in the pmd page which would
728 * control the given virtual address
730 static inline unsigned long pmd_index(unsigned long address
)
732 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
736 * Conversion functions: convert a page and protection to a page entry,
737 * and a page entry and page directory to the page they refer to.
739 * (Currently stuck as a macro because of indirect forward reference
740 * to linux/mm.h:page_to_nid())
742 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
745 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
747 * this function returns the index of the entry in the pte page which would
748 * control the given virtual address
750 static inline unsigned long pte_index(unsigned long address
)
752 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
755 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
757 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
760 static inline int pmd_bad(pmd_t pmd
)
762 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
765 static inline unsigned long pages_to_mb(unsigned long npg
)
767 return npg
>> (20 - PAGE_SHIFT
);
770 #if CONFIG_PGTABLE_LEVELS > 2
771 static inline int pud_none(pud_t pud
)
773 return (native_pud_val(pud
) & ~(_PAGE_KNL_ERRATUM_MASK
)) == 0;
776 static inline int pud_present(pud_t pud
)
778 return pud_flags(pud
) & _PAGE_PRESENT
;
781 static inline unsigned long pud_page_vaddr(pud_t pud
)
783 return (unsigned long)__va(pud_val(pud
) & pud_pfn_mask(pud
));
787 * Currently stuck as a macro due to indirect forward reference to
788 * linux/mmzone.h's __section_mem_map_addr() definition:
790 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
792 /* Find an entry in the second-level page table.. */
793 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
795 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
798 static inline int pud_large(pud_t pud
)
800 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
801 (_PAGE_PSE
| _PAGE_PRESENT
);
804 static inline int pud_bad(pud_t pud
)
806 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
809 static inline int pud_large(pud_t pud
)
813 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
815 static inline unsigned long pud_index(unsigned long address
)
817 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
820 #if CONFIG_PGTABLE_LEVELS > 3
821 static inline int p4d_none(p4d_t p4d
)
823 return (native_p4d_val(p4d
) & ~(_PAGE_KNL_ERRATUM_MASK
)) == 0;
826 static inline int p4d_present(p4d_t p4d
)
828 return p4d_flags(p4d
) & _PAGE_PRESENT
;
831 static inline unsigned long p4d_page_vaddr(p4d_t p4d
)
833 return (unsigned long)__va(p4d_val(p4d
) & p4d_pfn_mask(p4d
));
837 * Currently stuck as a macro due to indirect forward reference to
838 * linux/mmzone.h's __section_mem_map_addr() definition:
840 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
842 /* Find an entry in the third-level page table.. */
843 static inline pud_t
*pud_offset(p4d_t
*p4d
, unsigned long address
)
845 return (pud_t
*)p4d_page_vaddr(*p4d
) + pud_index(address
);
848 static inline int p4d_bad(p4d_t p4d
)
850 unsigned long ignore_flags
= _KERNPG_TABLE
| _PAGE_USER
;
852 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION
))
853 ignore_flags
|= _PAGE_NX
;
855 return (p4d_flags(p4d
) & ~ignore_flags
) != 0;
857 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
859 static inline unsigned long p4d_index(unsigned long address
)
861 return (address
>> P4D_SHIFT
) & (PTRS_PER_P4D
- 1);
864 #if CONFIG_PGTABLE_LEVELS > 4
865 static inline int pgd_present(pgd_t pgd
)
867 return pgd_flags(pgd
) & _PAGE_PRESENT
;
870 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
872 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
876 * Currently stuck as a macro due to indirect forward reference to
877 * linux/mmzone.h's __section_mem_map_addr() definition:
879 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
881 /* to find an entry in a page-table-directory. */
882 static inline p4d_t
*p4d_offset(pgd_t
*pgd
, unsigned long address
)
884 return (p4d_t
*)pgd_page_vaddr(*pgd
) + p4d_index(address
);
887 static inline int pgd_bad(pgd_t pgd
)
889 unsigned long ignore_flags
= _PAGE_USER
;
891 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION
))
892 ignore_flags
|= _PAGE_NX
;
894 return (pgd_flags(pgd
) & ~ignore_flags
) != _KERNPG_TABLE
;
897 static inline int pgd_none(pgd_t pgd
)
900 * There is no need to do a workaround for the KNL stray
901 * A/D bit erratum here. PGDs only point to page tables
902 * except on 32-bit non-PAE which is not supported on
905 return !native_pgd_val(pgd
);
907 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
909 #endif /* __ASSEMBLY__ */
912 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
914 * this macro returns the index of the entry in the pgd page which would
915 * control the given virtual address
917 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
920 * pgd_offset() returns a (pgd_t *)
921 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
923 #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address)))
925 * a shortcut to get a pgd_t in a given mm
927 #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address))
929 * a shortcut which implies the use of the kernel's pgd, instead
932 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
935 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
936 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
940 extern int direct_gbpages
;
941 void init_mem_mapping(void);
942 void early_alloc_pgt_buf(void);
943 extern void memblock_find_dma_reserve(void);
946 /* Realmode trampoline initialization. */
947 extern pgd_t trampoline_pgd_entry
;
948 static inline void __meminit
init_trampoline_default(void)
950 /* Default trampoline pgd value */
951 trampoline_pgd_entry
= init_top_pgt
[pgd_index(__PAGE_OFFSET
)];
953 # ifdef CONFIG_RANDOMIZE_MEMORY
954 void __meminit
init_trampoline(void);
956 # define init_trampoline init_trampoline_default
959 static inline void init_trampoline(void) { }
962 /* local pte updates need not use xchg for locking */
963 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
967 /* Pure native function needs no input for mm, addr */
968 native_pte_clear(NULL
, 0, ptep
);
972 static inline pmd_t
native_local_pmdp_get_and_clear(pmd_t
*pmdp
)
976 native_pmd_clear(pmdp
);
980 static inline pud_t
native_local_pudp_get_and_clear(pud_t
*pudp
)
984 native_pud_clear(pudp
);
988 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
989 pte_t
*ptep
, pte_t pte
)
991 native_set_pte(ptep
, pte
);
994 static inline void set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
995 pmd_t
*pmdp
, pmd_t pmd
)
997 native_set_pmd(pmdp
, pmd
);
1000 static inline void set_pud_at(struct mm_struct
*mm
, unsigned long addr
,
1001 pud_t
*pudp
, pud_t pud
)
1003 native_set_pud(pudp
, pud
);
1007 * We only update the dirty/accessed state if we set
1008 * the dirty bit by hand in the kernel, since the hardware
1009 * will do the accessed bit for us, and we don't want to
1010 * race with other CPU's that might be updating the dirty
1011 * bit at the same time.
1013 struct vm_area_struct
;
1015 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1016 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
1017 unsigned long address
, pte_t
*ptep
,
1018 pte_t entry
, int dirty
);
1020 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1021 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
1022 unsigned long addr
, pte_t
*ptep
);
1024 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1025 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
1026 unsigned long address
, pte_t
*ptep
);
1028 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1029 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
1032 pte_t pte
= native_ptep_get_and_clear(ptep
);
1036 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1037 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
1038 unsigned long addr
, pte_t
*ptep
,
1044 * Full address destruction in progress; paravirt does not
1045 * care about updates and native needs no locking
1047 pte
= native_local_ptep_get_and_clear(ptep
);
1049 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
1054 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1055 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
1056 unsigned long addr
, pte_t
*ptep
)
1058 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
1061 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1063 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1065 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1066 extern int pmdp_set_access_flags(struct vm_area_struct
*vma
,
1067 unsigned long address
, pmd_t
*pmdp
,
1068 pmd_t entry
, int dirty
);
1069 extern int pudp_set_access_flags(struct vm_area_struct
*vma
,
1070 unsigned long address
, pud_t
*pudp
,
1071 pud_t entry
, int dirty
);
1073 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1074 extern int pmdp_test_and_clear_young(struct vm_area_struct
*vma
,
1075 unsigned long addr
, pmd_t
*pmdp
);
1076 extern int pudp_test_and_clear_young(struct vm_area_struct
*vma
,
1077 unsigned long addr
, pud_t
*pudp
);
1079 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1080 extern int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
1081 unsigned long address
, pmd_t
*pmdp
);
1084 #define __HAVE_ARCH_PMD_WRITE
1085 static inline int pmd_write(pmd_t pmd
)
1087 return pmd_flags(pmd
) & _PAGE_RW
;
1090 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1091 static inline pmd_t
pmdp_huge_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
1094 return native_pmdp_get_and_clear(pmdp
);
1097 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1098 static inline pud_t
pudp_huge_get_and_clear(struct mm_struct
*mm
,
1099 unsigned long addr
, pud_t
*pudp
)
1101 return native_pudp_get_and_clear(pudp
);
1104 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1105 static inline void pmdp_set_wrprotect(struct mm_struct
*mm
,
1106 unsigned long addr
, pmd_t
*pmdp
)
1108 clear_bit(_PAGE_BIT_RW
, (unsigned long *)pmdp
);
1112 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1114 * dst - pointer to pgd range anwhere on a pgd page
1116 * count - the number of pgds to copy.
1118 * dst and src can be on the same page, but the range must not overlap,
1119 * and must not cross a page boundary.
1121 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
1123 memcpy(dst
, src
, count
* sizeof(pgd_t
));
1124 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1125 if (!static_cpu_has(X86_FEATURE_PTI
))
1127 /* Clone the user space pgd as well */
1128 memcpy(kernel_to_user_pgdp(dst
), kernel_to_user_pgdp(src
),
1129 count
* sizeof(pgd_t
));
1133 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1134 static inline int page_level_shift(enum pg_level level
)
1136 return (PAGE_SHIFT
- PTE_SHIFT
) + level
* PTE_SHIFT
;
1138 static inline unsigned long page_level_size(enum pg_level level
)
1140 return 1UL << page_level_shift(level
);
1142 static inline unsigned long page_level_mask(enum pg_level level
)
1144 return ~(page_level_size(level
) - 1);
1148 * The x86 doesn't have any external MMU info: the kernel page
1149 * tables contain all the necessary information.
1151 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
1152 unsigned long addr
, pte_t
*ptep
)
1155 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
1156 unsigned long addr
, pmd_t
*pmd
)
1159 static inline void update_mmu_cache_pud(struct vm_area_struct
*vma
,
1160 unsigned long addr
, pud_t
*pud
)
1164 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1165 static inline pte_t
pte_swp_mksoft_dirty(pte_t pte
)
1167 return pte_set_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
1170 static inline int pte_swp_soft_dirty(pte_t pte
)
1172 return pte_flags(pte
) & _PAGE_SWP_SOFT_DIRTY
;
1175 static inline pte_t
pte_swp_clear_soft_dirty(pte_t pte
)
1177 return pte_clear_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
1180 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1181 static inline pmd_t
pmd_swp_mksoft_dirty(pmd_t pmd
)
1183 return pmd_set_flags(pmd
, _PAGE_SWP_SOFT_DIRTY
);
1186 static inline int pmd_swp_soft_dirty(pmd_t pmd
)
1188 return pmd_flags(pmd
) & _PAGE_SWP_SOFT_DIRTY
;
1191 static inline pmd_t
pmd_swp_clear_soft_dirty(pmd_t pmd
)
1193 return pmd_clear_flags(pmd
, _PAGE_SWP_SOFT_DIRTY
);
1198 #define PKRU_AD_BIT 0x1
1199 #define PKRU_WD_BIT 0x2
1200 #define PKRU_BITS_PER_PKEY 2
1202 static inline bool __pkru_allows_read(u32 pkru
, u16 pkey
)
1204 int pkru_pkey_bits
= pkey
* PKRU_BITS_PER_PKEY
;
1205 return !(pkru
& (PKRU_AD_BIT
<< pkru_pkey_bits
));
1208 static inline bool __pkru_allows_write(u32 pkru
, u16 pkey
)
1210 int pkru_pkey_bits
= pkey
* PKRU_BITS_PER_PKEY
;
1212 * Access-disable disables writes too so we need to check
1215 return !(pkru
& ((PKRU_AD_BIT
|PKRU_WD_BIT
) << pkru_pkey_bits
));
1218 static inline u16
pte_flags_pkey(unsigned long pte_flags
)
1220 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1221 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1222 return (pte_flags
& _PAGE_PKEY_MASK
) >> _PAGE_BIT_PKEY_BIT0
;
1228 static inline bool __pkru_allows_pkey(u16 pkey
, bool write
)
1230 u32 pkru
= read_pkru();
1232 if (!__pkru_allows_read(pkru
, pkey
))
1234 if (write
&& !__pkru_allows_write(pkru
, pkey
))
1241 * 'pteval' can come from a PTE, PMD or PUD. We only check
1242 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1243 * same value on all 3 types.
1245 static inline bool __pte_access_permitted(unsigned long pteval
, bool write
)
1247 unsigned long need_pte_bits
= _PAGE_PRESENT
|_PAGE_USER
;
1250 need_pte_bits
|= _PAGE_RW
;
1252 if ((pteval
& need_pte_bits
) != need_pte_bits
)
1255 return __pkru_allows_pkey(pte_flags_pkey(pteval
), write
);
1258 #define pte_access_permitted pte_access_permitted
1259 static inline bool pte_access_permitted(pte_t pte
, bool write
)
1261 return __pte_access_permitted(pte_val(pte
), write
);
1264 #define pmd_access_permitted pmd_access_permitted
1265 static inline bool pmd_access_permitted(pmd_t pmd
, bool write
)
1267 return __pte_access_permitted(pmd_val(pmd
), write
);
1270 #define pud_access_permitted pud_access_permitted
1271 static inline bool pud_access_permitted(pud_t pud
, bool write
)
1273 return __pte_access_permitted(pud_val(pud
), write
);
1276 #include <asm-generic/pgtable.h>
1277 #endif /* __ASSEMBLY__ */
1279 #endif /* _ASM_X86_PGTABLE_H */