1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
5 #include <asm/pgtable_types.h>
8 * Macro to mark a page protection value as UC-
10 #define pgprot_noncached(prot) \
11 ((boot_cpu_data.x86 > 3) \
12 ? (__pgprot(pgprot_val(prot) | \
13 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
17 #include <asm/x86_init.h>
19 void ptdump_walk_pgd_level(struct seq_file
*m
, pgd_t
*pgd
);
20 void ptdump_walk_pgd_level_checkwx(void);
22 #ifdef CONFIG_DEBUG_WX
23 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
25 #define debug_checkwx() do { } while (0)
29 * ZERO_PAGE is a global shared page that is always zero: used
30 * for zero-mapped memory areas etc..
32 extern unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)]
34 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
36 extern spinlock_t pgd_lock
;
37 extern struct list_head pgd_list
;
39 extern struct mm_struct
*pgd_page_get_mm(struct page
*page
);
41 #ifdef CONFIG_PARAVIRT
42 #include <asm/paravirt.h>
43 #else /* !CONFIG_PARAVIRT */
44 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
45 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
46 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
47 #define set_pud_at(mm, addr, pudp, pud) native_set_pud_at(mm, addr, pudp, pud)
49 #define set_pte_atomic(ptep, pte) \
50 native_set_pte_atomic(ptep, pte)
52 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
54 #ifndef __PAGETABLE_PUD_FOLDED
55 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
56 #define pgd_clear(pgd) native_pgd_clear(pgd)
60 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
63 #ifndef __PAGETABLE_PUD_FOLDED
64 #define pud_clear(pud) native_pud_clear(pud)
67 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
68 #define pmd_clear(pmd) native_pmd_clear(pmd)
70 #define pte_update(mm, addr, ptep) do { } while (0)
72 #define pgd_val(x) native_pgd_val(x)
73 #define __pgd(x) native_make_pgd(x)
75 #ifndef __PAGETABLE_PUD_FOLDED
76 #define pud_val(x) native_pud_val(x)
77 #define __pud(x) native_make_pud(x)
80 #ifndef __PAGETABLE_PMD_FOLDED
81 #define pmd_val(x) native_pmd_val(x)
82 #define __pmd(x) native_make_pmd(x)
85 #define pte_val(x) native_pte_val(x)
86 #define __pte(x) native_make_pte(x)
88 #define arch_end_context_switch(prev) do {} while(0)
90 #endif /* CONFIG_PARAVIRT */
93 * The following only work if pte_present() is true.
94 * Undefined behaviour if not..
96 static inline int pte_dirty(pte_t pte
)
98 return pte_flags(pte
) & _PAGE_DIRTY
;
102 static inline u32
read_pkru(void)
104 if (boot_cpu_has(X86_FEATURE_OSPKE
))
105 return __read_pkru();
109 static inline void write_pkru(u32 pkru
)
111 if (boot_cpu_has(X86_FEATURE_OSPKE
))
115 static inline int pte_young(pte_t pte
)
117 return pte_flags(pte
) & _PAGE_ACCESSED
;
120 static inline int pmd_dirty(pmd_t pmd
)
122 return pmd_flags(pmd
) & _PAGE_DIRTY
;
125 static inline int pmd_young(pmd_t pmd
)
127 return pmd_flags(pmd
) & _PAGE_ACCESSED
;
130 static inline int pud_dirty(pud_t pud
)
132 return pud_flags(pud
) & _PAGE_DIRTY
;
135 static inline int pud_young(pud_t pud
)
137 return pud_flags(pud
) & _PAGE_ACCESSED
;
140 static inline int pte_write(pte_t pte
)
142 return pte_flags(pte
) & _PAGE_RW
;
145 static inline int pte_huge(pte_t pte
)
147 return pte_flags(pte
) & _PAGE_PSE
;
150 static inline int pte_global(pte_t pte
)
152 return pte_flags(pte
) & _PAGE_GLOBAL
;
155 static inline int pte_exec(pte_t pte
)
157 return !(pte_flags(pte
) & _PAGE_NX
);
160 static inline int pte_special(pte_t pte
)
162 return pte_flags(pte
) & _PAGE_SPECIAL
;
165 static inline unsigned long pte_pfn(pte_t pte
)
167 return (pte_val(pte
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
170 static inline unsigned long pmd_pfn(pmd_t pmd
)
172 return (pmd_val(pmd
) & pmd_pfn_mask(pmd
)) >> PAGE_SHIFT
;
175 static inline unsigned long pud_pfn(pud_t pud
)
177 return (pud_val(pud
) & pud_pfn_mask(pud
)) >> PAGE_SHIFT
;
180 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
182 static inline int pmd_large(pmd_t pte
)
184 return pmd_flags(pte
) & _PAGE_PSE
;
187 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
188 static inline int pmd_trans_huge(pmd_t pmd
)
190 return (pmd_val(pmd
) & (_PAGE_PSE
|_PAGE_DEVMAP
)) == _PAGE_PSE
;
193 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
194 static inline int pud_trans_huge(pud_t pud
)
196 return (pud_val(pud
) & (_PAGE_PSE
|_PAGE_DEVMAP
)) == _PAGE_PSE
;
200 #define has_transparent_hugepage has_transparent_hugepage
201 static inline int has_transparent_hugepage(void)
203 return boot_cpu_has(X86_FEATURE_PSE
);
206 #ifdef __HAVE_ARCH_PTE_DEVMAP
207 static inline int pmd_devmap(pmd_t pmd
)
209 return !!(pmd_val(pmd
) & _PAGE_DEVMAP
);
212 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
213 static inline int pud_devmap(pud_t pud
)
215 return !!(pud_val(pud
) & _PAGE_DEVMAP
);
218 static inline int pud_devmap(pud_t pud
)
224 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
226 static inline pte_t
pte_set_flags(pte_t pte
, pteval_t set
)
228 pteval_t v
= native_pte_val(pte
);
230 return native_make_pte(v
| set
);
233 static inline pte_t
pte_clear_flags(pte_t pte
, pteval_t clear
)
235 pteval_t v
= native_pte_val(pte
);
237 return native_make_pte(v
& ~clear
);
240 static inline pte_t
pte_mkclean(pte_t pte
)
242 return pte_clear_flags(pte
, _PAGE_DIRTY
);
245 static inline pte_t
pte_mkold(pte_t pte
)
247 return pte_clear_flags(pte
, _PAGE_ACCESSED
);
250 static inline pte_t
pte_wrprotect(pte_t pte
)
252 return pte_clear_flags(pte
, _PAGE_RW
);
255 static inline pte_t
pte_mkexec(pte_t pte
)
257 return pte_clear_flags(pte
, _PAGE_NX
);
260 static inline pte_t
pte_mkdirty(pte_t pte
)
262 return pte_set_flags(pte
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
265 static inline pte_t
pte_mkyoung(pte_t pte
)
267 return pte_set_flags(pte
, _PAGE_ACCESSED
);
270 static inline pte_t
pte_mkwrite(pte_t pte
)
272 return pte_set_flags(pte
, _PAGE_RW
);
275 static inline pte_t
pte_mkhuge(pte_t pte
)
277 return pte_set_flags(pte
, _PAGE_PSE
);
280 static inline pte_t
pte_clrhuge(pte_t pte
)
282 return pte_clear_flags(pte
, _PAGE_PSE
);
285 static inline pte_t
pte_mkglobal(pte_t pte
)
287 return pte_set_flags(pte
, _PAGE_GLOBAL
);
290 static inline pte_t
pte_clrglobal(pte_t pte
)
292 return pte_clear_flags(pte
, _PAGE_GLOBAL
);
295 static inline pte_t
pte_mkspecial(pte_t pte
)
297 return pte_set_flags(pte
, _PAGE_SPECIAL
);
300 static inline pte_t
pte_mkdevmap(pte_t pte
)
302 return pte_set_flags(pte
, _PAGE_SPECIAL
|_PAGE_DEVMAP
);
305 static inline pmd_t
pmd_set_flags(pmd_t pmd
, pmdval_t set
)
307 pmdval_t v
= native_pmd_val(pmd
);
309 return __pmd(v
| set
);
312 static inline pmd_t
pmd_clear_flags(pmd_t pmd
, pmdval_t clear
)
314 pmdval_t v
= native_pmd_val(pmd
);
316 return __pmd(v
& ~clear
);
319 static inline pmd_t
pmd_mkold(pmd_t pmd
)
321 return pmd_clear_flags(pmd
, _PAGE_ACCESSED
);
324 static inline pmd_t
pmd_mkclean(pmd_t pmd
)
326 return pmd_clear_flags(pmd
, _PAGE_DIRTY
);
329 static inline pmd_t
pmd_wrprotect(pmd_t pmd
)
331 return pmd_clear_flags(pmd
, _PAGE_RW
);
334 static inline pmd_t
pmd_mkdirty(pmd_t pmd
)
336 return pmd_set_flags(pmd
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
339 static inline pmd_t
pmd_mkdevmap(pmd_t pmd
)
341 return pmd_set_flags(pmd
, _PAGE_DEVMAP
);
344 static inline pmd_t
pmd_mkhuge(pmd_t pmd
)
346 return pmd_set_flags(pmd
, _PAGE_PSE
);
349 static inline pmd_t
pmd_mkyoung(pmd_t pmd
)
351 return pmd_set_flags(pmd
, _PAGE_ACCESSED
);
354 static inline pmd_t
pmd_mkwrite(pmd_t pmd
)
356 return pmd_set_flags(pmd
, _PAGE_RW
);
359 static inline pmd_t
pmd_mknotpresent(pmd_t pmd
)
361 return pmd_clear_flags(pmd
, _PAGE_PRESENT
| _PAGE_PROTNONE
);
364 static inline pud_t
pud_set_flags(pud_t pud
, pudval_t set
)
366 pudval_t v
= native_pud_val(pud
);
368 return __pud(v
| set
);
371 static inline pud_t
pud_clear_flags(pud_t pud
, pudval_t clear
)
373 pudval_t v
= native_pud_val(pud
);
375 return __pud(v
& ~clear
);
378 static inline pud_t
pud_mkold(pud_t pud
)
380 return pud_clear_flags(pud
, _PAGE_ACCESSED
);
383 static inline pud_t
pud_mkclean(pud_t pud
)
385 return pud_clear_flags(pud
, _PAGE_DIRTY
);
388 static inline pud_t
pud_wrprotect(pud_t pud
)
390 return pud_clear_flags(pud
, _PAGE_RW
);
393 static inline pud_t
pud_mkdirty(pud_t pud
)
395 return pud_set_flags(pud
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
398 static inline pud_t
pud_mkdevmap(pud_t pud
)
400 return pud_set_flags(pud
, _PAGE_DEVMAP
);
403 static inline pud_t
pud_mkhuge(pud_t pud
)
405 return pud_set_flags(pud
, _PAGE_PSE
);
408 static inline pud_t
pud_mkyoung(pud_t pud
)
410 return pud_set_flags(pud
, _PAGE_ACCESSED
);
413 static inline pud_t
pud_mkwrite(pud_t pud
)
415 return pud_set_flags(pud
, _PAGE_RW
);
418 static inline pud_t
pud_mknotpresent(pud_t pud
)
420 return pud_clear_flags(pud
, _PAGE_PRESENT
| _PAGE_PROTNONE
);
423 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
424 static inline int pte_soft_dirty(pte_t pte
)
426 return pte_flags(pte
) & _PAGE_SOFT_DIRTY
;
429 static inline int pmd_soft_dirty(pmd_t pmd
)
431 return pmd_flags(pmd
) & _PAGE_SOFT_DIRTY
;
434 static inline int pud_soft_dirty(pud_t pud
)
436 return pud_flags(pud
) & _PAGE_SOFT_DIRTY
;
439 static inline pte_t
pte_mksoft_dirty(pte_t pte
)
441 return pte_set_flags(pte
, _PAGE_SOFT_DIRTY
);
444 static inline pmd_t
pmd_mksoft_dirty(pmd_t pmd
)
446 return pmd_set_flags(pmd
, _PAGE_SOFT_DIRTY
);
449 static inline pud_t
pud_mksoft_dirty(pud_t pud
)
451 return pud_set_flags(pud
, _PAGE_SOFT_DIRTY
);
454 static inline pte_t
pte_clear_soft_dirty(pte_t pte
)
456 return pte_clear_flags(pte
, _PAGE_SOFT_DIRTY
);
459 static inline pmd_t
pmd_clear_soft_dirty(pmd_t pmd
)
461 return pmd_clear_flags(pmd
, _PAGE_SOFT_DIRTY
);
464 static inline pud_t
pud_clear_soft_dirty(pud_t pud
)
466 return pud_clear_flags(pud
, _PAGE_SOFT_DIRTY
);
469 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
472 * Mask out unsupported bits in a present pgprot. Non-present pgprots
473 * can use those bits for other purposes, so leave them be.
475 static inline pgprotval_t
massage_pgprot(pgprot_t pgprot
)
477 pgprotval_t protval
= pgprot_val(pgprot
);
479 if (protval
& _PAGE_PRESENT
)
480 protval
&= __supported_pte_mask
;
485 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
487 return __pte(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
488 massage_pgprot(pgprot
));
491 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
493 return __pmd(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
494 massage_pgprot(pgprot
));
497 static inline pud_t
pfn_pud(unsigned long page_nr
, pgprot_t pgprot
)
499 return __pud(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
500 massage_pgprot(pgprot
));
503 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
505 pteval_t val
= pte_val(pte
);
508 * Chop off the NX bit (if present), and add the NX portion of
509 * the newprot (if present):
511 val
&= _PAGE_CHG_MASK
;
512 val
|= massage_pgprot(newprot
) & ~_PAGE_CHG_MASK
;
517 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
519 pmdval_t val
= pmd_val(pmd
);
521 val
&= _HPAGE_CHG_MASK
;
522 val
|= massage_pgprot(newprot
) & ~_HPAGE_CHG_MASK
;
527 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
528 #define pgprot_modify pgprot_modify
529 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
531 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
532 pgprotval_t addbits
= pgprot_val(newprot
);
533 return __pgprot(preservebits
| addbits
);
536 #define pte_pgprot(x) __pgprot(pte_flags(x))
537 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
538 #define pud_pgprot(x) __pgprot(pud_flags(x))
540 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
542 static inline int is_new_memtype_allowed(u64 paddr
, unsigned long size
,
543 enum page_cache_mode pcm
,
544 enum page_cache_mode new_pcm
)
547 * PAT type is always WB for untracked ranges, so no need to check.
549 if (x86_platform
.is_untracked_pat_range(paddr
, paddr
+ size
))
553 * Certain new memtypes are not allowed with certain
555 * - request is uncached, return cannot be write-back
556 * - request is write-combine, return cannot be write-back
557 * - request is write-through, return cannot be write-back
558 * - request is write-through, return cannot be write-combine
560 if ((pcm
== _PAGE_CACHE_MODE_UC_MINUS
&&
561 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
562 (pcm
== _PAGE_CACHE_MODE_WC
&&
563 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
564 (pcm
== _PAGE_CACHE_MODE_WT
&&
565 new_pcm
== _PAGE_CACHE_MODE_WB
) ||
566 (pcm
== _PAGE_CACHE_MODE_WT
&&
567 new_pcm
== _PAGE_CACHE_MODE_WC
)) {
574 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
575 pte_t
*populate_extra_pte(unsigned long vaddr
);
576 #endif /* __ASSEMBLY__ */
579 # include <asm/pgtable_32.h>
581 # include <asm/pgtable_64.h>
585 #include <linux/mm_types.h>
586 #include <linux/mmdebug.h>
587 #include <linux/log2.h>
589 static inline int pte_none(pte_t pte
)
591 return !(pte
.pte
& ~(_PAGE_KNL_ERRATUM_MASK
));
594 #define __HAVE_ARCH_PTE_SAME
595 static inline int pte_same(pte_t a
, pte_t b
)
597 return a
.pte
== b
.pte
;
600 static inline int pte_present(pte_t a
)
602 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
);
605 #ifdef __HAVE_ARCH_PTE_DEVMAP
606 static inline int pte_devmap(pte_t a
)
608 return (pte_flags(a
) & _PAGE_DEVMAP
) == _PAGE_DEVMAP
;
612 #define pte_accessible pte_accessible
613 static inline bool pte_accessible(struct mm_struct
*mm
, pte_t a
)
615 if (pte_flags(a
) & _PAGE_PRESENT
)
618 if ((pte_flags(a
) & _PAGE_PROTNONE
) &&
619 mm_tlb_flush_pending(mm
))
625 static inline int pte_hidden(pte_t pte
)
627 return pte_flags(pte
) & _PAGE_HIDDEN
;
630 static inline int pmd_present(pmd_t pmd
)
633 * Checking for _PAGE_PSE is needed too because
634 * split_huge_page will temporarily clear the present bit (but
635 * the _PAGE_PSE flag will remain set at all times while the
636 * _PAGE_PRESENT bit is clear).
638 return pmd_flags(pmd
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
| _PAGE_PSE
);
641 #ifdef CONFIG_NUMA_BALANCING
643 * These work without NUMA balancing but the kernel does not care. See the
644 * comment in include/asm-generic/pgtable.h
646 static inline int pte_protnone(pte_t pte
)
648 return (pte_flags(pte
) & (_PAGE_PROTNONE
| _PAGE_PRESENT
))
652 static inline int pmd_protnone(pmd_t pmd
)
654 return (pmd_flags(pmd
) & (_PAGE_PROTNONE
| _PAGE_PRESENT
))
657 #endif /* CONFIG_NUMA_BALANCING */
659 static inline int pmd_none(pmd_t pmd
)
661 /* Only check low word on 32-bit platforms, since it might be
662 out of sync with upper half. */
663 unsigned long val
= native_pmd_val(pmd
);
664 return (val
& ~_PAGE_KNL_ERRATUM_MASK
) == 0;
667 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
669 return (unsigned long)__va(pmd_val(pmd
) & pmd_pfn_mask(pmd
));
673 * Currently stuck as a macro due to indirect forward reference to
674 * linux/mmzone.h's __section_mem_map_addr() definition:
676 #define pmd_page(pmd) \
677 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
680 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
682 * this macro returns the index of the entry in the pmd page which would
683 * control the given virtual address
685 static inline unsigned long pmd_index(unsigned long address
)
687 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
691 * Conversion functions: convert a page and protection to a page entry,
692 * and a page entry and page directory to the page they refer to.
694 * (Currently stuck as a macro because of indirect forward reference
695 * to linux/mm.h:page_to_nid())
697 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
700 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
702 * this function returns the index of the entry in the pte page which would
703 * control the given virtual address
705 static inline unsigned long pte_index(unsigned long address
)
707 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
710 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
712 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
715 static inline int pmd_bad(pmd_t pmd
)
717 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
720 static inline unsigned long pages_to_mb(unsigned long npg
)
722 return npg
>> (20 - PAGE_SHIFT
);
725 #if CONFIG_PGTABLE_LEVELS > 2
726 static inline int pud_none(pud_t pud
)
728 return (native_pud_val(pud
) & ~(_PAGE_KNL_ERRATUM_MASK
)) == 0;
731 static inline int pud_present(pud_t pud
)
733 return pud_flags(pud
) & _PAGE_PRESENT
;
736 static inline unsigned long pud_page_vaddr(pud_t pud
)
738 return (unsigned long)__va(pud_val(pud
) & pud_pfn_mask(pud
));
742 * Currently stuck as a macro due to indirect forward reference to
743 * linux/mmzone.h's __section_mem_map_addr() definition:
745 #define pud_page(pud) \
746 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
748 /* Find an entry in the second-level page table.. */
749 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
751 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
754 static inline int pud_large(pud_t pud
)
756 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
757 (_PAGE_PSE
| _PAGE_PRESENT
);
760 static inline int pud_bad(pud_t pud
)
762 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
765 static inline int pud_large(pud_t pud
)
769 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
771 #if CONFIG_PGTABLE_LEVELS > 3
772 static inline int pgd_present(pgd_t pgd
)
774 return pgd_flags(pgd
) & _PAGE_PRESENT
;
777 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
779 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
783 * Currently stuck as a macro due to indirect forward reference to
784 * linux/mmzone.h's __section_mem_map_addr() definition:
786 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
788 /* to find an entry in a page-table-directory. */
789 static inline unsigned long pud_index(unsigned long address
)
791 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
794 static inline pud_t
*pud_offset(pgd_t
*pgd
, unsigned long address
)
796 return (pud_t
*)pgd_page_vaddr(*pgd
) + pud_index(address
);
799 static inline int pgd_bad(pgd_t pgd
)
801 return (pgd_flags(pgd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
804 static inline int pgd_none(pgd_t pgd
)
807 * There is no need to do a workaround for the KNL stray
808 * A/D bit erratum here. PGDs only point to page tables
809 * except on 32-bit non-PAE which is not supported on
812 return !native_pgd_val(pgd
);
814 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
816 #endif /* __ASSEMBLY__ */
819 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
821 * this macro returns the index of the entry in the pgd page which would
822 * control the given virtual address
824 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
827 * pgd_offset() returns a (pgd_t *)
828 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
830 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
832 * a shortcut which implies the use of the kernel's pgd, instead
835 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
838 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
839 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
843 extern int direct_gbpages
;
844 void init_mem_mapping(void);
845 void early_alloc_pgt_buf(void);
846 extern void memblock_find_dma_reserve(void);
849 /* Realmode trampoline initialization. */
850 extern pgd_t trampoline_pgd_entry
;
851 static inline void __meminit
init_trampoline_default(void)
853 /* Default trampoline pgd value */
854 trampoline_pgd_entry
= init_level4_pgt
[pgd_index(__PAGE_OFFSET
)];
856 # ifdef CONFIG_RANDOMIZE_MEMORY
857 void __meminit
init_trampoline(void);
859 # define init_trampoline init_trampoline_default
862 static inline void init_trampoline(void) { }
865 /* local pte updates need not use xchg for locking */
866 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
870 /* Pure native function needs no input for mm, addr */
871 native_pte_clear(NULL
, 0, ptep
);
875 static inline pmd_t
native_local_pmdp_get_and_clear(pmd_t
*pmdp
)
879 native_pmd_clear(pmdp
);
883 static inline pud_t
native_local_pudp_get_and_clear(pud_t
*pudp
)
887 native_pud_clear(pudp
);
891 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
892 pte_t
*ptep
, pte_t pte
)
894 native_set_pte(ptep
, pte
);
897 static inline void native_set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
898 pmd_t
*pmdp
, pmd_t pmd
)
900 native_set_pmd(pmdp
, pmd
);
903 static inline void native_set_pud_at(struct mm_struct
*mm
, unsigned long addr
,
904 pud_t
*pudp
, pud_t pud
)
906 native_set_pud(pudp
, pud
);
909 #ifndef CONFIG_PARAVIRT
911 * Rules for using pte_update - it must be called after any PTE update which
912 * has not been done using the set_pte / clear_pte interfaces. It is used by
913 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
914 * updates should either be sets, clears, or set_pte_atomic for P->P
915 * transitions, which means this hook should only be called for user PTEs.
916 * This hook implies a P->P protection or access change has taken place, which
917 * requires a subsequent TLB flush.
919 #define pte_update(mm, addr, ptep) do { } while (0)
923 * We only update the dirty/accessed state if we set
924 * the dirty bit by hand in the kernel, since the hardware
925 * will do the accessed bit for us, and we don't want to
926 * race with other CPU's that might be updating the dirty
927 * bit at the same time.
929 struct vm_area_struct
;
931 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
932 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
933 unsigned long address
, pte_t
*ptep
,
934 pte_t entry
, int dirty
);
936 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
937 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
938 unsigned long addr
, pte_t
*ptep
);
940 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
941 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
942 unsigned long address
, pte_t
*ptep
);
944 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
945 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
948 pte_t pte
= native_ptep_get_and_clear(ptep
);
949 pte_update(mm
, addr
, ptep
);
953 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
954 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
955 unsigned long addr
, pte_t
*ptep
,
961 * Full address destruction in progress; paravirt does not
962 * care about updates and native needs no locking
964 pte
= native_local_ptep_get_and_clear(ptep
);
966 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
971 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
972 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
973 unsigned long addr
, pte_t
*ptep
)
975 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
976 pte_update(mm
, addr
, ptep
);
979 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
981 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
983 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
984 extern int pmdp_set_access_flags(struct vm_area_struct
*vma
,
985 unsigned long address
, pmd_t
*pmdp
,
986 pmd_t entry
, int dirty
);
987 extern int pudp_set_access_flags(struct vm_area_struct
*vma
,
988 unsigned long address
, pud_t
*pudp
,
989 pud_t entry
, int dirty
);
991 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
992 extern int pmdp_test_and_clear_young(struct vm_area_struct
*vma
,
993 unsigned long addr
, pmd_t
*pmdp
);
994 extern int pudp_test_and_clear_young(struct vm_area_struct
*vma
,
995 unsigned long addr
, pud_t
*pudp
);
997 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
998 extern int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
999 unsigned long address
, pmd_t
*pmdp
);
1002 #define __HAVE_ARCH_PMD_WRITE
1003 static inline int pmd_write(pmd_t pmd
)
1005 return pmd_flags(pmd
) & _PAGE_RW
;
1008 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1009 static inline pmd_t
pmdp_huge_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
1012 return native_pmdp_get_and_clear(pmdp
);
1015 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1016 static inline pud_t
pudp_huge_get_and_clear(struct mm_struct
*mm
,
1017 unsigned long addr
, pud_t
*pudp
)
1019 return native_pudp_get_and_clear(pudp
);
1022 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1023 static inline void pmdp_set_wrprotect(struct mm_struct
*mm
,
1024 unsigned long addr
, pmd_t
*pmdp
)
1026 clear_bit(_PAGE_BIT_RW
, (unsigned long *)pmdp
);
1030 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1032 * dst - pointer to pgd range anwhere on a pgd page
1034 * count - the number of pgds to copy.
1036 * dst and src can be on the same page, but the range must not overlap,
1037 * and must not cross a page boundary.
1039 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
1041 memcpy(dst
, src
, count
* sizeof(pgd_t
));
1044 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1045 static inline int page_level_shift(enum pg_level level
)
1047 return (PAGE_SHIFT
- PTE_SHIFT
) + level
* PTE_SHIFT
;
1049 static inline unsigned long page_level_size(enum pg_level level
)
1051 return 1UL << page_level_shift(level
);
1053 static inline unsigned long page_level_mask(enum pg_level level
)
1055 return ~(page_level_size(level
) - 1);
1059 * The x86 doesn't have any external MMU info: the kernel page
1060 * tables contain all the necessary information.
1062 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
1063 unsigned long addr
, pte_t
*ptep
)
1066 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
1067 unsigned long addr
, pmd_t
*pmd
)
1070 static inline void update_mmu_cache_pud(struct vm_area_struct
*vma
,
1071 unsigned long addr
, pud_t
*pud
)
1075 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1076 static inline pte_t
pte_swp_mksoft_dirty(pte_t pte
)
1078 return pte_set_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
1081 static inline int pte_swp_soft_dirty(pte_t pte
)
1083 return pte_flags(pte
) & _PAGE_SWP_SOFT_DIRTY
;
1086 static inline pte_t
pte_swp_clear_soft_dirty(pte_t pte
)
1088 return pte_clear_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
1092 #define PKRU_AD_BIT 0x1
1093 #define PKRU_WD_BIT 0x2
1094 #define PKRU_BITS_PER_PKEY 2
1096 static inline bool __pkru_allows_read(u32 pkru
, u16 pkey
)
1098 int pkru_pkey_bits
= pkey
* PKRU_BITS_PER_PKEY
;
1099 return !(pkru
& (PKRU_AD_BIT
<< pkru_pkey_bits
));
1102 static inline bool __pkru_allows_write(u32 pkru
, u16 pkey
)
1104 int pkru_pkey_bits
= pkey
* PKRU_BITS_PER_PKEY
;
1106 * Access-disable disables writes too so we need to check
1109 return !(pkru
& ((PKRU_AD_BIT
|PKRU_WD_BIT
) << pkru_pkey_bits
));
1112 static inline u16
pte_flags_pkey(unsigned long pte_flags
)
1114 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1115 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1116 return (pte_flags
& _PAGE_PKEY_MASK
) >> _PAGE_BIT_PKEY_BIT0
;
1122 #include <asm-generic/pgtable.h>
1123 #endif /* __ASSEMBLY__ */
1125 #endif /* _ASM_X86_PGTABLE_H */