1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
4 #include <linux/mem_encrypt.h>
6 #include <asm/pgtable_types.h>
9 * Macro to mark a page protection value as UC-
11 #define pgprot_noncached(prot) \
12 ((boot_cpu_data.x86 > 3) \
13 ? (__pgprot(pgprot_val(prot) | \
14 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
18 * Macros to add or remove encryption attribute
20 #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot)))
21 #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot)))
24 #include <asm/x86_init.h>
26 extern pgd_t early_top_pgt
[PTRS_PER_PGD
];
27 int __init
__early_make_pgtable(unsigned long address
, pmdval_t pmd
);
29 void ptdump_walk_pgd_level(struct seq_file
*m
, pgd_t
*pgd
);
30 void ptdump_walk_pgd_level_checkwx(void);
32 #ifdef CONFIG_DEBUG_WX
33 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
35 #define debug_checkwx() do { } while (0)
39 * ZERO_PAGE is a global shared page that is always zero: used
40 * for zero-mapped memory areas etc..
42 extern unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)]
44 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
46 extern spinlock_t pgd_lock
;
47 extern struct list_head pgd_list
;
49 extern struct mm_struct
*pgd_page_get_mm(struct page
*page
);
51 extern pmdval_t early_pmd_flags
;
53 #ifdef CONFIG_PARAVIRT
54 #include <asm/paravirt.h>
55 #else /* !CONFIG_PARAVIRT */
56 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
57 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
59 #define set_pte_atomic(ptep, pte) \
60 native_set_pte_atomic(ptep, pte)
62 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
64 #ifndef __PAGETABLE_P4D_FOLDED
65 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
66 #define pgd_clear(pgd) native_pgd_clear(pgd)
70 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
73 #ifndef __PAGETABLE_PUD_FOLDED
74 #define p4d_clear(p4d) native_p4d_clear(p4d)
78 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
81 #ifndef __PAGETABLE_PUD_FOLDED
82 #define pud_clear(pud) native_pud_clear(pud)
85 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
86 #define pmd_clear(pmd) native_pmd_clear(pmd)
88 #define pgd_val(x) native_pgd_val(x)
89 #define __pgd(x) native_make_pgd(x)
91 #ifndef __PAGETABLE_P4D_FOLDED
92 #define p4d_val(x) native_p4d_val(x)
93 #define __p4d(x) native_make_p4d(x)
96 #ifndef __PAGETABLE_PUD_FOLDED
97 #define pud_val(x) native_pud_val(x)
98 #define __pud(x) native_make_pud(x)
101 #ifndef __PAGETABLE_PMD_FOLDED
102 #define pmd_val(x) native_pmd_val(x)
103 #define __pmd(x) native_make_pmd(x)
106 #define pte_val(x) native_pte_val(x)
107 #define __pte(x) native_make_pte(x)
109 #define arch_end_context_switch(prev) do {} while(0)
111 #endif /* CONFIG_PARAVIRT */
114 * The following only work if pte_present() is true.
115 * Undefined behaviour if not..
117 static inline int pte_dirty(pte_t pte
)
119 return pte_flags(pte
) & _PAGE_DIRTY
;
123 static inline u32
read_pkru(void)
125 if (boot_cpu_has(X86_FEATURE_OSPKE
))
126 return __read_pkru();
130 static inline void write_pkru(u32 pkru
)
132 if (boot_cpu_has(X86_FEATURE_OSPKE
))
136 static inline int pte_young(pte_t pte
)
138 return pte_flags(pte
) & _PAGE_ACCESSED
;
141 static inline int pmd_dirty(pmd_t pmd
)
143 return pmd_flags(pmd
) & _PAGE_DIRTY
;
146 static inline int pmd_young(pmd_t pmd
)
148 return pmd_flags(pmd
) & _PAGE_ACCESSED
;
151 static inline int pud_dirty(pud_t pud
)
153 return pud_flags(pud
) & _PAGE_DIRTY
;
156 static inline int pud_young(pud_t pud
)
158 return pud_flags(pud
) & _PAGE_ACCESSED
;
161 static inline int pte_write(pte_t pte
)
163 return pte_flags(pte
) & _PAGE_RW
;
166 static inline int pte_huge(pte_t pte
)
168 return pte_flags(pte
) & _PAGE_PSE
;
171 static inline int pte_global(pte_t pte
)
173 return pte_flags(pte
) & _PAGE_GLOBAL
;
176 static inline int pte_exec(pte_t pte
)
178 return !(pte_flags(pte
) & _PAGE_NX
);
181 static inline int pte_special(pte_t pte
)
183 return pte_flags(pte
) & _PAGE_SPECIAL
;
186 static inline unsigned long pte_pfn(pte_t pte
)
188 return (pte_val(pte
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
191 static inline unsigned long pmd_pfn(pmd_t pmd
)
193 return (pmd_val(pmd
) & pmd_pfn_mask(pmd
)) >> PAGE_SHIFT
;
196 static inline unsigned long pud_pfn(pud_t pud
)
198 return (pud_val(pud
) & pud_pfn_mask(pud
)) >> PAGE_SHIFT
;
201 static inline unsigned long p4d_pfn(p4d_t p4d
)
203 return (p4d_val(p4d
) & p4d_pfn_mask(p4d
)) >> PAGE_SHIFT
;
206 static inline unsigned long pgd_pfn(pgd_t pgd
)
208 return (pgd_val(pgd
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
211 static inline int p4d_large(p4d_t p4d
)
213 /* No 512 GiB pages yet */
217 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
219 static inline int pmd_large(pmd_t pte
)
221 return pmd_flags(pte
) & _PAGE_PSE
;
224 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
225 static inline int pmd_trans_huge(pmd_t pmd
)
227 return (pmd_val(pmd
) & (_PAGE_PSE
|_PAGE_DEVMAP
)) == _PAGE_PSE
;
230 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
231 static inline int pud_trans_huge(pud_t pud
)
233 return (pud_val(pud
) & (_PAGE_PSE
|_PAGE_DEVMAP
)) == _PAGE_PSE
;
237 #define has_transparent_hugepage has_transparent_hugepage
238 static inline int has_transparent_hugepage(void)
240 return boot_cpu_has(X86_FEATURE_PSE
);
243 #ifdef __HAVE_ARCH_PTE_DEVMAP
244 static inline int pmd_devmap(pmd_t pmd
)
246 return !!(pmd_val(pmd
) & _PAGE_DEVMAP
);
249 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
250 static inline int pud_devmap(pud_t pud
)
252 return !!(pud_val(pud
) & _PAGE_DEVMAP
);
255 static inline int pud_devmap(pud_t pud
)
261 static inline int pgd_devmap(pgd_t pgd
)
266 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
268 static inline pte_t
pte_set_flags(pte_t pte
, pteval_t set
)
270 pteval_t v
= native_pte_val(pte
);
272 return native_make_pte(v
| set
);
275 static inline pte_t
pte_clear_flags(pte_t pte
, pteval_t clear
)
277 pteval_t v
= native_pte_val(pte
);
279 return native_make_pte(v
& ~clear
);
282 static inline pte_t
pte_mkclean(pte_t pte
)
284 return pte_clear_flags(pte
, _PAGE_DIRTY
);
287 static inline pte_t
pte_mkold(pte_t pte
)
289 return pte_clear_flags(pte
, _PAGE_ACCESSED
);
292 static inline pte_t
pte_wrprotect(pte_t pte
)
294 return pte_clear_flags(pte
, _PAGE_RW
);
297 static inline pte_t
pte_mkexec(pte_t pte
)
299 return pte_clear_flags(pte
, _PAGE_NX
);
302 static inline pte_t
pte_mkdirty(pte_t pte
)
304 return pte_set_flags(pte
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
307 static inline pte_t
pte_mkyoung(pte_t pte
)
309 return pte_set_flags(pte
, _PAGE_ACCESSED
);
312 static inline pte_t
pte_mkwrite(pte_t pte
)
314 return pte_set_flags(pte
, _PAGE_RW
);
317 static inline pte_t
pte_mkhuge(pte_t pte
)
319 return pte_set_flags(pte
, _PAGE_PSE
);
322 static inline pte_t
pte_clrhuge(pte_t pte
)
324 return pte_clear_flags(pte
, _PAGE_PSE
);
327 static inline pte_t
pte_mkglobal(pte_t pte
)
329 return pte_set_flags(pte
, _PAGE_GLOBAL
);
332 static inline pte_t
pte_clrglobal(pte_t pte
)
334 return pte_clear_flags(pte
, _PAGE_GLOBAL
);
337 static inline pte_t
pte_mkspecial(pte_t pte
)
339 return pte_set_flags(pte
, _PAGE_SPECIAL
);
342 static inline pte_t
pte_mkdevmap(pte_t pte
)
344 return pte_set_flags(pte
, _PAGE_SPECIAL
|_PAGE_DEVMAP
);
347 static inline pmd_t
pmd_set_flags(pmd_t pmd
, pmdval_t set
)
349 pmdval_t v
= native_pmd_val(pmd
);
351 return __pmd(v
| set
);
354 static inline pmd_t
pmd_clear_flags(pmd_t pmd
, pmdval_t clear
)
356 pmdval_t v
= native_pmd_val(pmd
);
358 return __pmd(v
& ~clear
);
361 static inline pmd_t
pmd_mkold(pmd_t pmd
)
363 return pmd_clear_flags(pmd
, _PAGE_ACCESSED
);
366 static inline pmd_t
pmd_mkclean(pmd_t pmd
)
368 return pmd_clear_flags(pmd
, _PAGE_DIRTY
);
371 static inline pmd_t
pmd_wrprotect(pmd_t pmd
)
373 return pmd_clear_flags(pmd
, _PAGE_RW
);
376 static inline pmd_t
pmd_mkdirty(pmd_t pmd
)
378 return pmd_set_flags(pmd
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
381 static inline pmd_t
pmd_mkdevmap(pmd_t pmd
)
383 return pmd_set_flags(pmd
, _PAGE_DEVMAP
);
386 static inline pmd_t
pmd_mkhuge(pmd_t pmd
)
388 return pmd_set_flags(pmd
, _PAGE_PSE
);
391 static inline pmd_t
pmd_mkyoung(pmd_t pmd
)
393 return pmd_set_flags(pmd
, _PAGE_ACCESSED
);
396 static inline pmd_t
pmd_mkwrite(pmd_t pmd
)
398 return pmd_set_flags(pmd
, _PAGE_RW
);
401 static inline pmd_t
pmd_mknotpresent(pmd_t pmd
)
403 return pmd_clear_flags(pmd
, _PAGE_PRESENT
| _PAGE_PROTNONE
);
406 static inline pud_t
pud_set_flags(pud_t pud
, pudval_t set
)
408 pudval_t v
= native_pud_val(pud
);
410 return __pud(v
| set
);
413 static inline pud_t
pud_clear_flags(pud_t pud
, pudval_t clear
)
415 pudval_t v
= native_pud_val(pud
);
417 return __pud(v
& ~clear
);
420 static inline pud_t
pud_mkold(pud_t pud
)
422 return pud_clear_flags(pud
, _PAGE_ACCESSED
);
425 static inline pud_t
pud_mkclean(pud_t pud
)
427 return pud_clear_flags(pud
, _PAGE_DIRTY
);
430 static inline pud_t
pud_wrprotect(pud_t pud
)
432 return pud_clear_flags(pud
, _PAGE_RW
);
435 static inline pud_t
pud_mkdirty(pud_t pud
)
437 return pud_set_flags(pud
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
440 static inline pud_t
pud_mkdevmap(pud_t pud
)
442 return pud_set_flags(pud
, _PAGE_DEVMAP
);
445 static inline pud_t
pud_mkhuge(pud_t pud
)
447 return pud_set_flags(pud
, _PAGE_PSE
);
450 static inline pud_t
pud_mkyoung(pud_t pud
)
452 return pud_set_flags(pud
, _PAGE_ACCESSED
);
455 static inline pud_t
pud_mkwrite(pud_t pud
)
457 return pud_set_flags(pud
, _PAGE_RW
);
460 static inline pud_t
pud_mknotpresent(pud_t pud
)
462 return pud_clear_flags(pud
, _PAGE_PRESENT
| _PAGE_PROTNONE
);
465 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
466 static inline int pte_soft_dirty(pte_t pte
)
468 return pte_flags(pte
) & _PAGE_SOFT_DIRTY
;
471 static inline int pmd_soft_dirty(pmd_t pmd
)
473 return pmd_flags(pmd
) & _PAGE_SOFT_DIRTY
;
476 static inline int pud_soft_dirty(pud_t pud
)
478 return pud_flags(pud
) & _PAGE_SOFT_DIRTY
;
481 static inline pte_t
pte_mksoft_dirty(pte_t pte
)
483 return pte_set_flags(pte
, _PAGE_SOFT_DIRTY
);
486 static inline pmd_t
pmd_mksoft_dirty(pmd_t pmd
)
488 return pmd_set_flags(pmd
, _PAGE_SOFT_DIRTY
);
491 static inline pud_t
pud_mksoft_dirty(pud_t pud
)
493 return pud_set_flags(pud
, _PAGE_SOFT_DIRTY
);
496 static inline pte_t
pte_clear_soft_dirty(pte_t pte
)
498 return pte_clear_flags(pte
, _PAGE_SOFT_DIRTY
);
501 static inline pmd_t
pmd_clear_soft_dirty(pmd_t pmd
)
503 return pmd_clear_flags(pmd
, _PAGE_SOFT_DIRTY
);
506 static inline pud_t
pud_clear_soft_dirty(pud_t pud
)
508 return pud_clear_flags(pud
, _PAGE_SOFT_DIRTY
);
511 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
514 * Mask out unsupported bits in a present pgprot. Non-present pgprots
515 * can use those bits for other purposes, so leave them be.
517 static inline pgprotval_t
massage_pgprot(pgprot_t pgprot
)
519 pgprotval_t protval
= pgprot_val(pgprot
);
521 if (protval
& _PAGE_PRESENT
)
522 protval
&= __supported_pte_mask
;
527 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
529 return __pte(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
530 massage_pgprot(pgprot
));
533 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
535 return __pmd(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
536 massage_pgprot(pgprot
));
539 static inline pud_t
pfn_pud(unsigned long page_nr
, pgprot_t pgprot
)
541 return __pud(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
542 massage_pgprot(pgprot
));
545 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
547 pteval_t val
= pte_val(pte
);
550 * Chop off the NX bit (if present), and add the NX portion of
551 * the newprot (if present):
553 val
&= _PAGE_CHG_MASK
;
554 val
|= massage_pgprot(newprot
) & ~_PAGE_CHG_MASK
;
559 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
561 pmdval_t val
= pmd_val(pmd
);
563 val
&= _HPAGE_CHG_MASK
;
564 val
|= massage_pgprot(newprot
) & ~_HPAGE_CHG_MASK
;
569 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
570 #define pgprot_modify pgprot_modify
571 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
573 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
574 pgprotval_t addbits
= pgprot_val(newprot
);
575 return __pgprot(preservebits
| addbits
);
578 #define pte_pgprot(x) __pgprot(pte_flags(x))
579 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
580 #define pud_pgprot(x) __pgprot(pud_flags(x))
581 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
583 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
585 static inline int is_new_memtype_allowed(u64 paddr
, unsigned long size
,
586 enum page_cache_mode pcm
,
587 enum page_cache_mode new_pcm
)
590 * PAT type is always WB for untracked ranges, so no need to check.
592 if (x86_platform
.is_untracked_pat_range(paddr
, paddr
+ size
))
596 * Certain new memtypes are not allowed with certain
598 * - request is uncached, return cannot be write-back
599 * - request is write-combine, return cannot be write-back
600 * - request is write-through, return cannot be write-back
601 * - request is write-through, return cannot be write-combine
603 if ((pcm
== _PAGE_CACHE_MODE_UC_MINUS
&&
604 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
605 (pcm
== _PAGE_CACHE_MODE_WC
&&
606 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
607 (pcm
== _PAGE_CACHE_MODE_WT
&&
608 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
609 (pcm
== _PAGE_CACHE_MODE_WT
&&
610 new_pcm
== _PAGE_CACHE_MODE_WC
)) {
617 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
618 pte_t
*populate_extra_pte(unsigned long vaddr
);
619 #endif /* __ASSEMBLY__ */
622 # include <asm/pgtable_32.h>
624 # include <asm/pgtable_64.h>
628 #include <linux/mm_types.h>
629 #include <linux/mmdebug.h>
630 #include <linux/log2.h>
631 #include <asm/fixmap.h>
633 static inline int pte_none(pte_t pte
)
635 return !(pte
.pte
& ~(_PAGE_KNL_ERRATUM_MASK
));
638 #define __HAVE_ARCH_PTE_SAME
639 static inline int pte_same(pte_t a
, pte_t b
)
641 return a
.pte
== b
.pte
;
644 static inline int pte_present(pte_t a
)
646 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
);
649 #ifdef __HAVE_ARCH_PTE_DEVMAP
650 static inline int pte_devmap(pte_t a
)
652 return (pte_flags(a
) & _PAGE_DEVMAP
) == _PAGE_DEVMAP
;
656 #define pte_accessible pte_accessible
657 static inline bool pte_accessible(struct mm_struct
*mm
, pte_t a
)
659 if (pte_flags(a
) & _PAGE_PRESENT
)
662 if ((pte_flags(a
) & _PAGE_PROTNONE
) &&
663 mm_tlb_flush_pending(mm
))
669 static inline int pte_hidden(pte_t pte
)
671 return pte_flags(pte
) & _PAGE_HIDDEN
;
674 static inline int pmd_present(pmd_t pmd
)
677 * Checking for _PAGE_PSE is needed too because
678 * split_huge_page will temporarily clear the present bit (but
679 * the _PAGE_PSE flag will remain set at all times while the
680 * _PAGE_PRESENT bit is clear).
682 return pmd_flags(pmd
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
| _PAGE_PSE
);
685 #ifdef CONFIG_NUMA_BALANCING
687 * These work without NUMA balancing but the kernel does not care. See the
688 * comment in include/asm-generic/pgtable.h
690 static inline int pte_protnone(pte_t pte
)
692 return (pte_flags(pte
) & (_PAGE_PROTNONE
| _PAGE_PRESENT
))
696 static inline int pmd_protnone(pmd_t pmd
)
698 return (pmd_flags(pmd
) & (_PAGE_PROTNONE
| _PAGE_PRESENT
))
701 #endif /* CONFIG_NUMA_BALANCING */
703 static inline int pmd_none(pmd_t pmd
)
705 /* Only check low word on 32-bit platforms, since it might be
706 out of sync with upper half. */
707 unsigned long val
= native_pmd_val(pmd
);
708 return (val
& ~_PAGE_KNL_ERRATUM_MASK
) == 0;
711 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
713 return (unsigned long)__va(pmd_val(pmd
) & pmd_pfn_mask(pmd
));
717 * Currently stuck as a macro due to indirect forward reference to
718 * linux/mmzone.h's __section_mem_map_addr() definition:
720 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
723 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
725 * this macro returns the index of the entry in the pmd page which would
726 * control the given virtual address
728 static inline unsigned long pmd_index(unsigned long address
)
730 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
734 * Conversion functions: convert a page and protection to a page entry,
735 * and a page entry and page directory to the page they refer to.
737 * (Currently stuck as a macro because of indirect forward reference
738 * to linux/mm.h:page_to_nid())
740 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
743 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
745 * this function returns the index of the entry in the pte page which would
746 * control the given virtual address
748 static inline unsigned long pte_index(unsigned long address
)
750 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
753 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
755 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
758 static inline int pmd_bad(pmd_t pmd
)
760 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
763 static inline unsigned long pages_to_mb(unsigned long npg
)
765 return npg
>> (20 - PAGE_SHIFT
);
768 #if CONFIG_PGTABLE_LEVELS > 2
769 static inline int pud_none(pud_t pud
)
771 return (native_pud_val(pud
) & ~(_PAGE_KNL_ERRATUM_MASK
)) == 0;
774 static inline int pud_present(pud_t pud
)
776 return pud_flags(pud
) & _PAGE_PRESENT
;
779 static inline unsigned long pud_page_vaddr(pud_t pud
)
781 return (unsigned long)__va(pud_val(pud
) & pud_pfn_mask(pud
));
785 * Currently stuck as a macro due to indirect forward reference to
786 * linux/mmzone.h's __section_mem_map_addr() definition:
788 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
790 /* Find an entry in the second-level page table.. */
791 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
793 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
796 static inline int pud_large(pud_t pud
)
798 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
799 (_PAGE_PSE
| _PAGE_PRESENT
);
802 static inline int pud_bad(pud_t pud
)
804 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
807 static inline int pud_large(pud_t pud
)
811 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
813 static inline unsigned long pud_index(unsigned long address
)
815 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
818 #if CONFIG_PGTABLE_LEVELS > 3
819 static inline int p4d_none(p4d_t p4d
)
821 return (native_p4d_val(p4d
) & ~(_PAGE_KNL_ERRATUM_MASK
)) == 0;
824 static inline int p4d_present(p4d_t p4d
)
826 return p4d_flags(p4d
) & _PAGE_PRESENT
;
829 static inline unsigned long p4d_page_vaddr(p4d_t p4d
)
831 return (unsigned long)__va(p4d_val(p4d
) & p4d_pfn_mask(p4d
));
835 * Currently stuck as a macro due to indirect forward reference to
836 * linux/mmzone.h's __section_mem_map_addr() definition:
838 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
840 /* Find an entry in the third-level page table.. */
841 static inline pud_t
*pud_offset(p4d_t
*p4d
, unsigned long address
)
843 return (pud_t
*)p4d_page_vaddr(*p4d
) + pud_index(address
);
846 static inline int p4d_bad(p4d_t p4d
)
848 return (p4d_flags(p4d
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
850 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
852 static inline unsigned long p4d_index(unsigned long address
)
854 return (address
>> P4D_SHIFT
) & (PTRS_PER_P4D
- 1);
857 #if CONFIG_PGTABLE_LEVELS > 4
858 static inline int pgd_present(pgd_t pgd
)
860 return pgd_flags(pgd
) & _PAGE_PRESENT
;
863 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
865 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
869 * Currently stuck as a macro due to indirect forward reference to
870 * linux/mmzone.h's __section_mem_map_addr() definition:
872 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
874 /* to find an entry in a page-table-directory. */
875 static inline p4d_t
*p4d_offset(pgd_t
*pgd
, unsigned long address
)
877 return (p4d_t
*)pgd_page_vaddr(*pgd
) + p4d_index(address
);
880 static inline int pgd_bad(pgd_t pgd
)
882 return (pgd_flags(pgd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
885 static inline int pgd_none(pgd_t pgd
)
888 * There is no need to do a workaround for the KNL stray
889 * A/D bit erratum here. PGDs only point to page tables
890 * except on 32-bit non-PAE which is not supported on
893 return !native_pgd_val(pgd
);
895 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
897 #endif /* __ASSEMBLY__ */
900 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
902 * this macro returns the index of the entry in the pgd page which would
903 * control the given virtual address
905 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
908 * pgd_offset() returns a (pgd_t *)
909 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
911 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
913 * a shortcut which implies the use of the kernel's pgd, instead
916 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
919 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
920 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
924 extern int direct_gbpages
;
925 void init_mem_mapping(void);
926 void early_alloc_pgt_buf(void);
927 extern void memblock_find_dma_reserve(void);
930 /* Realmode trampoline initialization. */
931 extern pgd_t trampoline_pgd_entry
;
932 static inline void __meminit
init_trampoline_default(void)
934 /* Default trampoline pgd value */
935 trampoline_pgd_entry
= init_top_pgt
[pgd_index(__PAGE_OFFSET
)];
937 # ifdef CONFIG_RANDOMIZE_MEMORY
938 void __meminit
init_trampoline(void);
940 # define init_trampoline init_trampoline_default
943 static inline void init_trampoline(void) { }
946 /* local pte updates need not use xchg for locking */
947 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
951 /* Pure native function needs no input for mm, addr */
952 native_pte_clear(NULL
, 0, ptep
);
956 static inline pmd_t
native_local_pmdp_get_and_clear(pmd_t
*pmdp
)
960 native_pmd_clear(pmdp
);
964 static inline pud_t
native_local_pudp_get_and_clear(pud_t
*pudp
)
968 native_pud_clear(pudp
);
972 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
973 pte_t
*ptep
, pte_t pte
)
975 native_set_pte(ptep
, pte
);
978 static inline void set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
979 pmd_t
*pmdp
, pmd_t pmd
)
981 native_set_pmd(pmdp
, pmd
);
984 static inline void set_pud_at(struct mm_struct
*mm
, unsigned long addr
,
985 pud_t
*pudp
, pud_t pud
)
987 native_set_pud(pudp
, pud
);
991 * We only update the dirty/accessed state if we set
992 * the dirty bit by hand in the kernel, since the hardware
993 * will do the accessed bit for us, and we don't want to
994 * race with other CPU's that might be updating the dirty
995 * bit at the same time.
997 struct vm_area_struct
;
999 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1000 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
1001 unsigned long address
, pte_t
*ptep
,
1002 pte_t entry
, int dirty
);
1004 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1005 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
1006 unsigned long addr
, pte_t
*ptep
);
1008 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1009 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
1010 unsigned long address
, pte_t
*ptep
);
1012 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1013 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
1016 pte_t pte
= native_ptep_get_and_clear(ptep
);
1020 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1021 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
1022 unsigned long addr
, pte_t
*ptep
,
1028 * Full address destruction in progress; paravirt does not
1029 * care about updates and native needs no locking
1031 pte
= native_local_ptep_get_and_clear(ptep
);
1033 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
1038 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1039 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
1040 unsigned long addr
, pte_t
*ptep
)
1042 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
1045 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1047 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1049 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1050 extern int pmdp_set_access_flags(struct vm_area_struct
*vma
,
1051 unsigned long address
, pmd_t
*pmdp
,
1052 pmd_t entry
, int dirty
);
1053 extern int pudp_set_access_flags(struct vm_area_struct
*vma
,
1054 unsigned long address
, pud_t
*pudp
,
1055 pud_t entry
, int dirty
);
1057 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1058 extern int pmdp_test_and_clear_young(struct vm_area_struct
*vma
,
1059 unsigned long addr
, pmd_t
*pmdp
);
1060 extern int pudp_test_and_clear_young(struct vm_area_struct
*vma
,
1061 unsigned long addr
, pud_t
*pudp
);
1063 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1064 extern int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
1065 unsigned long address
, pmd_t
*pmdp
);
1068 #define __HAVE_ARCH_PMD_WRITE
1069 static inline int pmd_write(pmd_t pmd
)
1071 return pmd_flags(pmd
) & _PAGE_RW
;
1074 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1075 static inline pmd_t
pmdp_huge_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
1078 return native_pmdp_get_and_clear(pmdp
);
1081 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1082 static inline pud_t
pudp_huge_get_and_clear(struct mm_struct
*mm
,
1083 unsigned long addr
, pud_t
*pudp
)
1085 return native_pudp_get_and_clear(pudp
);
1088 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1089 static inline void pmdp_set_wrprotect(struct mm_struct
*mm
,
1090 unsigned long addr
, pmd_t
*pmdp
)
1092 clear_bit(_PAGE_BIT_RW
, (unsigned long *)pmdp
);
1096 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1098 * dst - pointer to pgd range anwhere on a pgd page
1100 * count - the number of pgds to copy.
1102 * dst and src can be on the same page, but the range must not overlap,
1103 * and must not cross a page boundary.
1105 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
1107 memcpy(dst
, src
, count
* sizeof(pgd_t
));
1110 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1111 static inline int page_level_shift(enum pg_level level
)
1113 return (PAGE_SHIFT
- PTE_SHIFT
) + level
* PTE_SHIFT
;
1115 static inline unsigned long page_level_size(enum pg_level level
)
1117 return 1UL << page_level_shift(level
);
1119 static inline unsigned long page_level_mask(enum pg_level level
)
1121 return ~(page_level_size(level
) - 1);
1125 * The x86 doesn't have any external MMU info: the kernel page
1126 * tables contain all the necessary information.
1128 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
1129 unsigned long addr
, pte_t
*ptep
)
1132 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
1133 unsigned long addr
, pmd_t
*pmd
)
1136 static inline void update_mmu_cache_pud(struct vm_area_struct
*vma
,
1137 unsigned long addr
, pud_t
*pud
)
1141 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1142 static inline pte_t
pte_swp_mksoft_dirty(pte_t pte
)
1144 return pte_set_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
1147 static inline int pte_swp_soft_dirty(pte_t pte
)
1149 return pte_flags(pte
) & _PAGE_SWP_SOFT_DIRTY
;
1152 static inline pte_t
pte_swp_clear_soft_dirty(pte_t pte
)
1154 return pte_clear_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
1157 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1158 static inline pmd_t
pmd_swp_mksoft_dirty(pmd_t pmd
)
1160 return pmd_set_flags(pmd
, _PAGE_SWP_SOFT_DIRTY
);
1163 static inline int pmd_swp_soft_dirty(pmd_t pmd
)
1165 return pmd_flags(pmd
) & _PAGE_SWP_SOFT_DIRTY
;
1168 static inline pmd_t
pmd_swp_clear_soft_dirty(pmd_t pmd
)
1170 return pmd_clear_flags(pmd
, _PAGE_SWP_SOFT_DIRTY
);
1175 #define PKRU_AD_BIT 0x1
1176 #define PKRU_WD_BIT 0x2
1177 #define PKRU_BITS_PER_PKEY 2
1179 static inline bool __pkru_allows_read(u32 pkru
, u16 pkey
)
1181 int pkru_pkey_bits
= pkey
* PKRU_BITS_PER_PKEY
;
1182 return !(pkru
& (PKRU_AD_BIT
<< pkru_pkey_bits
));
1185 static inline bool __pkru_allows_write(u32 pkru
, u16 pkey
)
1187 int pkru_pkey_bits
= pkey
* PKRU_BITS_PER_PKEY
;
1189 * Access-disable disables writes too so we need to check
1192 return !(pkru
& ((PKRU_AD_BIT
|PKRU_WD_BIT
) << pkru_pkey_bits
));
1195 static inline u16
pte_flags_pkey(unsigned long pte_flags
)
1197 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1198 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1199 return (pte_flags
& _PAGE_PKEY_MASK
) >> _PAGE_BIT_PKEY_BIT0
;
1205 static inline bool __pkru_allows_pkey(u16 pkey
, bool write
)
1207 u32 pkru
= read_pkru();
1209 if (!__pkru_allows_read(pkru
, pkey
))
1211 if (write
&& !__pkru_allows_write(pkru
, pkey
))
1218 * 'pteval' can come from a PTE, PMD or PUD. We only check
1219 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1220 * same value on all 3 types.
1222 static inline bool __pte_access_permitted(unsigned long pteval
, bool write
)
1224 unsigned long need_pte_bits
= _PAGE_PRESENT
|_PAGE_USER
;
1227 need_pte_bits
|= _PAGE_RW
;
1229 if ((pteval
& need_pte_bits
) != need_pte_bits
)
1232 return __pkru_allows_pkey(pte_flags_pkey(pteval
), write
);
1235 #define pte_access_permitted pte_access_permitted
1236 static inline bool pte_access_permitted(pte_t pte
, bool write
)
1238 return __pte_access_permitted(pte_val(pte
), write
);
1241 #define pmd_access_permitted pmd_access_permitted
1242 static inline bool pmd_access_permitted(pmd_t pmd
, bool write
)
1244 return __pte_access_permitted(pmd_val(pmd
), write
);
1247 #define pud_access_permitted pud_access_permitted
1248 static inline bool pud_access_permitted(pud_t pud
, bool write
)
1250 return __pte_access_permitted(pud_val(pud
), write
);
1253 #include <asm-generic/pgtable.h>
1254 #endif /* __ASSEMBLY__ */
1256 #endif /* _ASM_X86_PGTABLE_H */