1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_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 #include <asm/x86_init.h>
21 #ifdef CONFIG_PAGE_TABLE_ISOLATION
22 extern int kaiser_enabled;
24 #define kaiser_enabled 0
27 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
28 void ptdump_walk_pgd_level_checkwx(void);
30 #ifdef CONFIG_DEBUG_WX
31 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
33 #define debug_checkwx() do { } while (0)
37 * ZERO_PAGE is a global shared page that is always zero: used
38 * for zero-mapped memory areas etc..
40 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
42 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
44 extern spinlock_t pgd_lock;
45 extern struct list_head pgd_list;
47 extern struct mm_struct *pgd_page_get_mm(struct page *page);
49 #ifdef CONFIG_PARAVIRT
50 #include <asm/paravirt.h>
51 #else /* !CONFIG_PARAVIRT */
52 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
53 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
54 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
56 #define set_pte_atomic(ptep, pte) \
57 native_set_pte_atomic(ptep, pte)
59 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
61 #ifndef __PAGETABLE_PUD_FOLDED
62 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
63 #define pgd_clear(pgd) native_pgd_clear(pgd)
67 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
70 #ifndef __PAGETABLE_PMD_FOLDED
71 #define pud_clear(pud) native_pud_clear(pud)
74 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
75 #define pmd_clear(pmd) native_pmd_clear(pmd)
77 #define pte_update(mm, addr, ptep) do { } while (0)
78 #define pte_update_defer(mm, addr, ptep) do { } while (0)
79 #define pmd_update(mm, addr, ptep) do { } while (0)
80 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
82 #define pgd_val(x) native_pgd_val(x)
83 #define __pgd(x) native_make_pgd(x)
85 #ifndef __PAGETABLE_PUD_FOLDED
86 #define pud_val(x) native_pud_val(x)
87 #define __pud(x) native_make_pud(x)
90 #ifndef __PAGETABLE_PMD_FOLDED
91 #define pmd_val(x) native_pmd_val(x)
92 #define __pmd(x) native_make_pmd(x)
95 #define pte_val(x) native_pte_val(x)
96 #define __pte(x) native_make_pte(x)
98 #define arch_end_context_switch(prev) do {} while(0)
100 #endif /* CONFIG_PARAVIRT */
103 * The following only work if pte_present() is true.
104 * Undefined behaviour if not..
106 static inline int pte_dirty(pte_t pte)
108 return pte_flags(pte) & _PAGE_DIRTY;
111 static inline int pte_young(pte_t pte)
113 return pte_flags(pte) & _PAGE_ACCESSED;
116 static inline int pmd_dirty(pmd_t pmd)
118 return pmd_flags(pmd) & _PAGE_DIRTY;
121 static inline int pmd_young(pmd_t pmd)
123 return pmd_flags(pmd) & _PAGE_ACCESSED;
126 static inline int pte_write(pte_t pte)
128 return pte_flags(pte) & _PAGE_RW;
131 static inline int pte_huge(pte_t pte)
133 return pte_flags(pte) & _PAGE_PSE;
136 static inline int pte_global(pte_t pte)
138 return pte_flags(pte) & _PAGE_GLOBAL;
141 static inline int pte_exec(pte_t pte)
143 return !(pte_flags(pte) & _PAGE_NX);
146 static inline int pte_special(pte_t pte)
148 return pte_flags(pte) & _PAGE_SPECIAL;
151 /* Entries that were set to PROT_NONE are inverted */
153 static inline u64 protnone_mask(u64 val);
155 static inline unsigned long pte_pfn(pte_t pte)
157 phys_addr_t pfn = pte_val(pte);
158 pfn ^= protnone_mask(pfn);
159 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
162 static inline unsigned long pmd_pfn(pmd_t pmd)
164 phys_addr_t pfn = pmd_val(pmd);
165 pfn ^= protnone_mask(pfn);
166 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
169 static inline unsigned long pud_pfn(pud_t pud)
171 phys_addr_t pfn = pud_val(pud);
172 pfn ^= protnone_mask(pfn);
173 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
176 static inline unsigned long pgd_pfn(pgd_t pgd)
178 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
181 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
183 static inline int pmd_large(pmd_t pte)
185 return pmd_flags(pte) & _PAGE_PSE;
188 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
189 static inline int pmd_trans_splitting(pmd_t pmd)
191 return pmd_val(pmd) & _PAGE_SPLITTING;
194 static inline int pmd_trans_huge(pmd_t pmd)
196 return pmd_val(pmd) & _PAGE_PSE;
199 static inline int has_transparent_hugepage(void)
203 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
205 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
207 pteval_t v = native_pte_val(pte);
209 return native_make_pte(v | set);
212 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
214 pteval_t v = native_pte_val(pte);
216 return native_make_pte(v & ~clear);
219 static inline pte_t pte_mkclean(pte_t pte)
221 return pte_clear_flags(pte, _PAGE_DIRTY);
224 static inline pte_t pte_mkold(pte_t pte)
226 return pte_clear_flags(pte, _PAGE_ACCESSED);
229 static inline pte_t pte_wrprotect(pte_t pte)
231 return pte_clear_flags(pte, _PAGE_RW);
234 static inline pte_t pte_mkexec(pte_t pte)
236 return pte_clear_flags(pte, _PAGE_NX);
239 static inline pte_t pte_mkdirty(pte_t pte)
241 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
244 static inline pte_t pte_mkyoung(pte_t pte)
246 return pte_set_flags(pte, _PAGE_ACCESSED);
249 static inline pte_t pte_mkwrite(pte_t pte)
251 return pte_set_flags(pte, _PAGE_RW);
254 static inline pte_t pte_mkhuge(pte_t pte)
256 return pte_set_flags(pte, _PAGE_PSE);
259 static inline pte_t pte_clrhuge(pte_t pte)
261 return pte_clear_flags(pte, _PAGE_PSE);
264 static inline pte_t pte_mkglobal(pte_t pte)
266 return pte_set_flags(pte, _PAGE_GLOBAL);
269 static inline pte_t pte_clrglobal(pte_t pte)
271 return pte_clear_flags(pte, _PAGE_GLOBAL);
274 static inline pte_t pte_mkspecial(pte_t pte)
276 return pte_set_flags(pte, _PAGE_SPECIAL);
279 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
281 pmdval_t v = native_pmd_val(pmd);
283 return __pmd(v | set);
286 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
288 pmdval_t v = native_pmd_val(pmd);
290 return __pmd(v & ~clear);
293 static inline pmd_t pmd_mkold(pmd_t pmd)
295 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
298 static inline pmd_t pmd_wrprotect(pmd_t pmd)
300 return pmd_clear_flags(pmd, _PAGE_RW);
303 static inline pmd_t pmd_mkdirty(pmd_t pmd)
305 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
308 static inline pmd_t pmd_mkhuge(pmd_t pmd)
310 return pmd_set_flags(pmd, _PAGE_PSE);
313 static inline pmd_t pmd_mkyoung(pmd_t pmd)
315 return pmd_set_flags(pmd, _PAGE_ACCESSED);
318 static inline pmd_t pmd_mkwrite(pmd_t pmd)
320 return pmd_set_flags(pmd, _PAGE_RW);
323 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
324 static inline int pte_soft_dirty(pte_t pte)
326 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
329 static inline int pmd_soft_dirty(pmd_t pmd)
331 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
334 static inline pte_t pte_mksoft_dirty(pte_t pte)
336 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
339 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
341 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
344 static inline pte_t pte_clear_soft_dirty(pte_t pte)
346 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
349 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
351 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
354 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
357 * Mask out unsupported bits in a present pgprot. Non-present pgprots
358 * can use those bits for other purposes, so leave them be.
360 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
362 pgprotval_t protval = pgprot_val(pgprot);
364 if (protval & _PAGE_PRESENT)
365 protval &= __supported_pte_mask;
370 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
372 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
373 pfn ^= protnone_mask(pgprot_val(pgprot));
375 return __pte(pfn | massage_pgprot(pgprot));
378 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
380 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
381 pfn ^= protnone_mask(pgprot_val(pgprot));
382 pfn &= PHYSICAL_PMD_PAGE_MASK;
383 return __pmd(pfn | massage_pgprot(pgprot));
386 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
388 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
389 pfn ^= protnone_mask(pgprot_val(pgprot));
390 pfn &= PHYSICAL_PUD_PAGE_MASK;
391 return __pud(pfn | massage_pgprot(pgprot));
394 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
396 return pfn_pmd(pmd_pfn(pmd),
397 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
400 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
402 pudval_t v = native_pud_val(pud);
404 return __pud(v | set);
407 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
409 pudval_t v = native_pud_val(pud);
411 return __pud(v & ~clear);
414 static inline pud_t pud_mkhuge(pud_t pud)
416 return pud_set_flags(pud, _PAGE_PSE);
419 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
421 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
423 pteval_t val = pte_val(pte), oldval = val;
426 * Chop off the NX bit (if present), and add the NX portion of
427 * the newprot (if present):
429 val &= _PAGE_CHG_MASK;
430 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
431 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
435 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
437 pmdval_t val = pmd_val(pmd), oldval = val;
439 val &= _HPAGE_CHG_MASK;
440 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
441 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
445 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
446 #define pgprot_modify pgprot_modify
447 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
449 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
450 pgprotval_t addbits = pgprot_val(newprot);
451 return __pgprot(preservebits | addbits);
454 #define pte_pgprot(x) __pgprot(pte_flags(x))
455 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
456 #define pud_pgprot(x) __pgprot(pud_flags(x))
458 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
460 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
461 enum page_cache_mode pcm,
462 enum page_cache_mode new_pcm)
465 * PAT type is always WB for untracked ranges, so no need to check.
467 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
471 * Certain new memtypes are not allowed with certain
473 * - request is uncached, return cannot be write-back
474 * - request is write-combine, return cannot be write-back
475 * - request is write-through, return cannot be write-back
476 * - request is write-through, return cannot be write-combine
478 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
479 new_pcm == _PAGE_CACHE_MODE_WB) ||
480 (pcm == _PAGE_CACHE_MODE_WC &&
481 new_pcm == _PAGE_CACHE_MODE_WB) ||
482 (pcm == _PAGE_CACHE_MODE_WT &&
483 new_pcm == _PAGE_CACHE_MODE_WB) ||
484 (pcm == _PAGE_CACHE_MODE_WT &&
485 new_pcm == _PAGE_CACHE_MODE_WC)) {
492 pmd_t *populate_extra_pmd(unsigned long vaddr);
493 pte_t *populate_extra_pte(unsigned long vaddr);
494 #endif /* __ASSEMBLY__ */
497 # include <asm/pgtable_32.h>
499 # include <asm/pgtable_64.h>
503 #include <linux/mm_types.h>
504 #include <linux/mmdebug.h>
505 #include <linux/log2.h>
507 static inline int pte_none(pte_t pte)
512 #define __HAVE_ARCH_PTE_SAME
513 static inline int pte_same(pte_t a, pte_t b)
515 return a.pte == b.pte;
518 static inline int pte_present(pte_t a)
520 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
523 #define pte_accessible pte_accessible
524 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
526 if (pte_flags(a) & _PAGE_PRESENT)
529 if ((pte_flags(a) & _PAGE_PROTNONE) &&
530 mm_tlb_flush_pending(mm))
536 static inline int pte_hidden(pte_t pte)
538 return pte_flags(pte) & _PAGE_HIDDEN;
541 static inline int pmd_present(pmd_t pmd)
544 * Checking for _PAGE_PSE is needed too because
545 * split_huge_page will temporarily clear the present bit (but
546 * the _PAGE_PSE flag will remain set at all times while the
547 * _PAGE_PRESENT bit is clear).
549 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
552 #ifdef CONFIG_NUMA_BALANCING
554 * These work without NUMA balancing but the kernel does not care. See the
555 * comment in include/asm-generic/pgtable.h
557 static inline int pte_protnone(pte_t pte)
559 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
563 static inline int pmd_protnone(pmd_t pmd)
565 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
568 #endif /* CONFIG_NUMA_BALANCING */
570 static inline int pmd_none(pmd_t pmd)
572 /* Only check low word on 32-bit platforms, since it might be
573 out of sync with upper half. */
574 return (unsigned long)native_pmd_val(pmd) == 0;
577 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
579 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
583 * Currently stuck as a macro due to indirect forward reference to
584 * linux/mmzone.h's __section_mem_map_addr() definition:
586 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
589 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
591 * this macro returns the index of the entry in the pmd page which would
592 * control the given virtual address
594 static inline unsigned long pmd_index(unsigned long address)
596 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
600 * Conversion functions: convert a page and protection to a page entry,
601 * and a page entry and page directory to the page they refer to.
603 * (Currently stuck as a macro because of indirect forward reference
604 * to linux/mm.h:page_to_nid())
606 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
609 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
611 * this function returns the index of the entry in the pte page which would
612 * control the given virtual address
614 static inline unsigned long pte_index(unsigned long address)
616 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
619 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
621 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
624 static inline int pmd_bad(pmd_t pmd)
626 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
629 static inline unsigned long pages_to_mb(unsigned long npg)
631 return npg >> (20 - PAGE_SHIFT);
634 #if CONFIG_PGTABLE_LEVELS > 2
635 static inline int pud_none(pud_t pud)
637 return native_pud_val(pud) == 0;
640 static inline int pud_present(pud_t pud)
642 return pud_flags(pud) & _PAGE_PRESENT;
645 static inline unsigned long pud_page_vaddr(pud_t pud)
647 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
651 * Currently stuck as a macro due to indirect forward reference to
652 * linux/mmzone.h's __section_mem_map_addr() definition:
654 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
656 /* Find an entry in the second-level page table.. */
657 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
659 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
662 static inline int pud_large(pud_t pud)
664 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
665 (_PAGE_PSE | _PAGE_PRESENT);
668 static inline int pud_bad(pud_t pud)
670 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
673 static inline int pud_large(pud_t pud)
677 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
679 #if CONFIG_PGTABLE_LEVELS > 3
680 static inline int pgd_present(pgd_t pgd)
682 return pgd_flags(pgd) & _PAGE_PRESENT;
685 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
687 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
691 * Currently stuck as a macro due to indirect forward reference to
692 * linux/mmzone.h's __section_mem_map_addr() definition:
694 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
696 /* to find an entry in a page-table-directory. */
697 static inline unsigned long pud_index(unsigned long address)
699 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
702 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
704 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
707 static inline int pgd_bad(pgd_t pgd)
709 pgdval_t ignore_flags = _PAGE_USER;
711 * We set NX on KAISER pgds that map userspace memory so
712 * that userspace can not meaningfully use the kernel
713 * page table by accident; it will fault on the first
714 * instruction it tries to run. See native_set_pgd().
717 ignore_flags |= _PAGE_NX;
719 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
722 static inline int pgd_none(pgd_t pgd)
724 return !native_pgd_val(pgd);
726 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
728 #endif /* __ASSEMBLY__ */
731 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
733 * this macro returns the index of the entry in the pgd page which would
734 * control the given virtual address
736 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
739 * pgd_offset() returns a (pgd_t *)
740 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
742 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
744 * a shortcut which implies the use of the kernel's pgd, instead
747 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
750 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
751 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
755 extern int direct_gbpages;
756 void init_mem_mapping(void);
757 void early_alloc_pgt_buf(void);
759 /* local pte updates need not use xchg for locking */
760 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
764 /* Pure native function needs no input for mm, addr */
765 native_pte_clear(NULL, 0, ptep);
769 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
773 native_pmd_clear(pmdp);
777 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
778 pte_t *ptep , pte_t pte)
780 native_set_pte(ptep, pte);
783 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
784 pmd_t *pmdp , pmd_t pmd)
786 native_set_pmd(pmdp, pmd);
789 #ifndef CONFIG_PARAVIRT
791 * Rules for using pte_update - it must be called after any PTE update which
792 * has not been done using the set_pte / clear_pte interfaces. It is used by
793 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
794 * updates should either be sets, clears, or set_pte_atomic for P->P
795 * transitions, which means this hook should only be called for user PTEs.
796 * This hook implies a P->P protection or access change has taken place, which
797 * requires a subsequent TLB flush. The notification can optionally be delayed
798 * until the TLB flush event by using the pte_update_defer form of the
799 * interface, but care must be taken to assure that the flush happens while
800 * still holding the same page table lock so that the shadow and primary pages
801 * do not become out of sync on SMP.
803 #define pte_update(mm, addr, ptep) do { } while (0)
804 #define pte_update_defer(mm, addr, ptep) do { } while (0)
808 * We only update the dirty/accessed state if we set
809 * the dirty bit by hand in the kernel, since the hardware
810 * will do the accessed bit for us, and we don't want to
811 * race with other CPU's that might be updating the dirty
812 * bit at the same time.
814 struct vm_area_struct;
816 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
817 extern int ptep_set_access_flags(struct vm_area_struct *vma,
818 unsigned long address, pte_t *ptep,
819 pte_t entry, int dirty);
821 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
822 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
823 unsigned long addr, pte_t *ptep);
825 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
826 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
827 unsigned long address, pte_t *ptep);
829 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
830 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
833 pte_t pte = native_ptep_get_and_clear(ptep);
834 pte_update(mm, addr, ptep);
838 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
839 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
840 unsigned long addr, pte_t *ptep,
846 * Full address destruction in progress; paravirt does not
847 * care about updates and native needs no locking
849 pte = native_local_ptep_get_and_clear(ptep);
851 pte = ptep_get_and_clear(mm, addr, ptep);
856 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
857 static inline void ptep_set_wrprotect(struct mm_struct *mm,
858 unsigned long addr, pte_t *ptep)
860 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
861 pte_update(mm, addr, ptep);
864 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
866 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
868 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
869 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
870 unsigned long address, pmd_t *pmdp,
871 pmd_t entry, int dirty);
873 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
874 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
875 unsigned long addr, pmd_t *pmdp);
877 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
878 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
879 unsigned long address, pmd_t *pmdp);
882 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
883 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
884 unsigned long addr, pmd_t *pmdp);
886 #define __HAVE_ARCH_PMD_WRITE
887 static inline int pmd_write(pmd_t pmd)
889 return pmd_flags(pmd) & _PAGE_RW;
892 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
893 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
896 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
897 pmd_update(mm, addr, pmdp);
901 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
902 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
903 unsigned long addr, pmd_t *pmdp)
905 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
906 pmd_update(mm, addr, pmdp);
910 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
912 * dst - pointer to pgd range anwhere on a pgd page
914 * count - the number of pgds to copy.
916 * dst and src can be on the same page, but the range must not overlap,
917 * and must not cross a page boundary.
919 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
921 memcpy(dst, src, count * sizeof(pgd_t));
922 #ifdef CONFIG_PAGE_TABLE_ISOLATION
923 if (kaiser_enabled) {
924 /* Clone the shadow pgd part as well */
925 memcpy(native_get_shadow_pgd(dst),
926 native_get_shadow_pgd(src),
927 count * sizeof(pgd_t));
932 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
933 static inline int page_level_shift(enum pg_level level)
935 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
937 static inline unsigned long page_level_size(enum pg_level level)
939 return 1UL << page_level_shift(level);
941 static inline unsigned long page_level_mask(enum pg_level level)
943 return ~(page_level_size(level) - 1);
947 * The x86 doesn't have any external MMU info: the kernel page
948 * tables contain all the necessary information.
950 static inline void update_mmu_cache(struct vm_area_struct *vma,
951 unsigned long addr, pte_t *ptep)
954 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
955 unsigned long addr, pmd_t *pmd)
959 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
960 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
962 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
965 static inline int pte_swp_soft_dirty(pte_t pte)
967 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
970 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
972 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
976 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
977 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
979 static inline bool arch_has_pfn_modify_check(void)
981 return boot_cpu_has_bug(X86_BUG_L1TF);
984 #include <asm-generic/pgtable.h>
985 #endif /* __ASSEMBLY__ */
987 #endif /* _ASM_X86_PGTABLE_H */