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) | _PAGE_CACHE_UC_MINUS)) \
19 #include <asm/x86_init.h>
22 * ZERO_PAGE is a global shared page that is always zero: used
23 * for zero-mapped memory areas etc..
25 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
26 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
28 extern spinlock_t pgd_lock;
29 extern struct list_head pgd_list;
31 extern struct mm_struct *pgd_page_get_mm(struct page *page);
33 #ifdef CONFIG_PARAVIRT
34 #include <asm/paravirt.h>
35 #else /* !CONFIG_PARAVIRT */
36 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
37 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
39 #define set_pte_atomic(ptep, pte) \
40 native_set_pte_atomic(ptep, pte)
42 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
44 #ifndef __PAGETABLE_PUD_FOLDED
45 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
46 #define pgd_clear(pgd) native_pgd_clear(pgd)
50 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
53 #ifndef __PAGETABLE_PMD_FOLDED
54 #define pud_clear(pud) native_pud_clear(pud)
57 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
58 #define pmd_clear(pmd) native_pmd_clear(pmd)
60 #define pte_update(mm, addr, ptep) do { } while (0)
61 #define pte_update_defer(mm, addr, ptep) do { } while (0)
63 #define pgd_val(x) native_pgd_val(x)
64 #define __pgd(x) native_make_pgd(x)
66 #ifndef __PAGETABLE_PUD_FOLDED
67 #define pud_val(x) native_pud_val(x)
68 #define __pud(x) native_make_pud(x)
71 #ifndef __PAGETABLE_PMD_FOLDED
72 #define pmd_val(x) native_pmd_val(x)
73 #define __pmd(x) native_make_pmd(x)
76 #define pte_val(x) native_pte_val(x)
77 #define __pte(x) native_make_pte(x)
79 #define arch_end_context_switch(prev) do {} while(0)
81 #endif /* CONFIG_PARAVIRT */
84 * The following only work if pte_present() is true.
85 * Undefined behaviour if not..
87 static inline int pte_dirty(pte_t pte)
89 return pte_flags(pte) & _PAGE_DIRTY;
92 static inline int pte_young(pte_t pte)
94 return pte_flags(pte) & _PAGE_ACCESSED;
97 static inline int pte_write(pte_t pte)
99 return pte_flags(pte) & _PAGE_RW;
102 static inline int pte_file(pte_t pte)
104 return pte_flags(pte) & _PAGE_FILE;
107 static inline int pte_huge(pte_t pte)
109 return pte_flags(pte) & _PAGE_PSE;
112 static inline int pte_global(pte_t pte)
114 return pte_flags(pte) & _PAGE_GLOBAL;
117 static inline int pte_exec(pte_t pte)
119 return !(pte_flags(pte) & _PAGE_NX);
122 static inline int pte_special(pte_t pte)
124 return pte_flags(pte) & _PAGE_SPECIAL;
127 static inline unsigned long pte_pfn(pte_t pte)
129 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
132 static inline unsigned long pmd_pfn(pmd_t pmd)
134 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
137 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
139 static inline int pmd_large(pmd_t pte)
141 return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
142 (_PAGE_PSE | _PAGE_PRESENT);
145 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
147 pteval_t v = native_pte_val(pte);
149 return native_make_pte(v | set);
152 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
154 pteval_t v = native_pte_val(pte);
156 return native_make_pte(v & ~clear);
159 static inline pte_t pte_mkclean(pte_t pte)
161 return pte_clear_flags(pte, _PAGE_DIRTY);
164 static inline pte_t pte_mkold(pte_t pte)
166 return pte_clear_flags(pte, _PAGE_ACCESSED);
169 static inline pte_t pte_wrprotect(pte_t pte)
171 return pte_clear_flags(pte, _PAGE_RW);
174 static inline pte_t pte_mkexec(pte_t pte)
176 return pte_clear_flags(pte, _PAGE_NX);
179 static inline pte_t pte_mkdirty(pte_t pte)
181 return pte_set_flags(pte, _PAGE_DIRTY);
184 static inline pte_t pte_mkyoung(pte_t pte)
186 return pte_set_flags(pte, _PAGE_ACCESSED);
189 static inline pte_t pte_mkwrite(pte_t pte)
191 return pte_set_flags(pte, _PAGE_RW);
194 static inline pte_t pte_mkhuge(pte_t pte)
196 return pte_set_flags(pte, _PAGE_PSE);
199 static inline pte_t pte_clrhuge(pte_t pte)
201 return pte_clear_flags(pte, _PAGE_PSE);
204 static inline pte_t pte_mkglobal(pte_t pte)
206 return pte_set_flags(pte, _PAGE_GLOBAL);
209 static inline pte_t pte_clrglobal(pte_t pte)
211 return pte_clear_flags(pte, _PAGE_GLOBAL);
214 static inline pte_t pte_mkspecial(pte_t pte)
216 return pte_set_flags(pte, _PAGE_SPECIAL);
220 * Mask out unsupported bits in a present pgprot. Non-present pgprots
221 * can use those bits for other purposes, so leave them be.
223 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
225 pgprotval_t protval = pgprot_val(pgprot);
227 if (protval & _PAGE_PRESENT)
228 protval &= __supported_pte_mask;
233 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
235 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
236 massage_pgprot(pgprot));
239 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
241 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
242 massage_pgprot(pgprot));
245 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
247 pteval_t val = pte_val(pte);
250 * Chop off the NX bit (if present), and add the NX portion of
251 * the newprot (if present):
253 val &= _PAGE_CHG_MASK;
254 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
259 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
260 #define pgprot_modify pgprot_modify
261 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
263 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
264 pgprotval_t addbits = pgprot_val(newprot);
265 return __pgprot(preservebits | addbits);
268 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
270 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
272 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
274 unsigned long new_flags)
277 * PAT type is always WB for untracked ranges, so no need to check.
279 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
283 * Certain new memtypes are not allowed with certain
285 * - request is uncached, return cannot be write-back
286 * - request is write-combine, return cannot be write-back
288 if ((flags == _PAGE_CACHE_UC_MINUS &&
289 new_flags == _PAGE_CACHE_WB) ||
290 (flags == _PAGE_CACHE_WC &&
291 new_flags == _PAGE_CACHE_WB)) {
298 pmd_t *populate_extra_pmd(unsigned long vaddr);
299 pte_t *populate_extra_pte(unsigned long vaddr);
300 #endif /* __ASSEMBLY__ */
303 # include "pgtable_32.h"
305 # include "pgtable_64.h"
309 #include <linux/mm_types.h>
311 static inline int pte_none(pte_t pte)
316 #define __HAVE_ARCH_PTE_SAME
317 static inline int pte_same(pte_t a, pte_t b)
319 return a.pte == b.pte;
322 static inline int pte_present(pte_t a)
324 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
327 static inline int pte_hidden(pte_t pte)
329 return pte_flags(pte) & _PAGE_HIDDEN;
332 static inline int pmd_present(pmd_t pmd)
334 return pmd_flags(pmd) & _PAGE_PRESENT;
337 static inline int pmd_none(pmd_t pmd)
339 /* Only check low word on 32-bit platforms, since it might be
340 out of sync with upper half. */
341 return (unsigned long)native_pmd_val(pmd) == 0;
344 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
346 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
350 * Currently stuck as a macro due to indirect forward reference to
351 * linux/mmzone.h's __section_mem_map_addr() definition:
353 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
356 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
358 * this macro returns the index of the entry in the pmd page which would
359 * control the given virtual address
361 static inline unsigned long pmd_index(unsigned long address)
363 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
367 * Conversion functions: convert a page and protection to a page entry,
368 * and a page entry and page directory to the page they refer to.
370 * (Currently stuck as a macro because of indirect forward reference
371 * to linux/mm.h:page_to_nid())
373 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
376 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
378 * this function returns the index of the entry in the pte page which would
379 * control the given virtual address
381 static inline unsigned long pte_index(unsigned long address)
383 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
386 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
388 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
391 static inline int pmd_bad(pmd_t pmd)
393 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
396 static inline unsigned long pages_to_mb(unsigned long npg)
398 return npg >> (20 - PAGE_SHIFT);
401 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
402 remap_pfn_range(vma, vaddr, pfn, size, prot)
404 #if PAGETABLE_LEVELS > 2
405 static inline int pud_none(pud_t pud)
407 return native_pud_val(pud) == 0;
410 static inline int pud_present(pud_t pud)
412 return pud_flags(pud) & _PAGE_PRESENT;
415 static inline unsigned long pud_page_vaddr(pud_t pud)
417 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
421 * Currently stuck as a macro due to indirect forward reference to
422 * linux/mmzone.h's __section_mem_map_addr() definition:
424 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
426 /* Find an entry in the second-level page table.. */
427 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
429 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
432 static inline int pud_large(pud_t pud)
434 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
435 (_PAGE_PSE | _PAGE_PRESENT);
438 static inline int pud_bad(pud_t pud)
440 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
443 static inline int pud_large(pud_t pud)
447 #endif /* PAGETABLE_LEVELS > 2 */
449 #if PAGETABLE_LEVELS > 3
450 static inline int pgd_present(pgd_t pgd)
452 return pgd_flags(pgd) & _PAGE_PRESENT;
455 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
457 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
461 * Currently stuck as a macro due to indirect forward reference to
462 * linux/mmzone.h's __section_mem_map_addr() definition:
464 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
466 /* to find an entry in a page-table-directory. */
467 static inline unsigned long pud_index(unsigned long address)
469 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
472 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
474 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
477 static inline int pgd_bad(pgd_t pgd)
479 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
482 static inline int pgd_none(pgd_t pgd)
484 return !native_pgd_val(pgd);
486 #endif /* PAGETABLE_LEVELS > 3 */
488 #endif /* __ASSEMBLY__ */
491 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
493 * this macro returns the index of the entry in the pgd page which would
494 * control the given virtual address
496 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
499 * pgd_offset() returns a (pgd_t *)
500 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
502 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
504 * a shortcut which implies the use of the kernel's pgd, instead
507 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
510 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
511 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
515 extern int direct_gbpages;
517 /* local pte updates need not use xchg for locking */
518 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
522 /* Pure native function needs no input for mm, addr */
523 native_pte_clear(NULL, 0, ptep);
527 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
528 pte_t *ptep , pte_t pte)
530 native_set_pte(ptep, pte);
533 #ifndef CONFIG_PARAVIRT
535 * Rules for using pte_update - it must be called after any PTE update which
536 * has not been done using the set_pte / clear_pte interfaces. It is used by
537 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
538 * updates should either be sets, clears, or set_pte_atomic for P->P
539 * transitions, which means this hook should only be called for user PTEs.
540 * This hook implies a P->P protection or access change has taken place, which
541 * requires a subsequent TLB flush. The notification can optionally be delayed
542 * until the TLB flush event by using the pte_update_defer form of the
543 * interface, but care must be taken to assure that the flush happens while
544 * still holding the same page table lock so that the shadow and primary pages
545 * do not become out of sync on SMP.
547 #define pte_update(mm, addr, ptep) do { } while (0)
548 #define pte_update_defer(mm, addr, ptep) do { } while (0)
552 * We only update the dirty/accessed state if we set
553 * the dirty bit by hand in the kernel, since the hardware
554 * will do the accessed bit for us, and we don't want to
555 * race with other CPU's that might be updating the dirty
556 * bit at the same time.
558 struct vm_area_struct;
560 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
561 extern int ptep_set_access_flags(struct vm_area_struct *vma,
562 unsigned long address, pte_t *ptep,
563 pte_t entry, int dirty);
565 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
566 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
567 unsigned long addr, pte_t *ptep);
569 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
570 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
571 unsigned long address, pte_t *ptep);
573 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
574 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
577 pte_t pte = native_ptep_get_and_clear(ptep);
578 pte_update(mm, addr, ptep);
582 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
583 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
584 unsigned long addr, pte_t *ptep,
590 * Full address destruction in progress; paravirt does not
591 * care about updates and native needs no locking
593 pte = native_local_ptep_get_and_clear(ptep);
595 pte = ptep_get_and_clear(mm, addr, ptep);
600 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
601 static inline void ptep_set_wrprotect(struct mm_struct *mm,
602 unsigned long addr, pte_t *ptep)
604 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
605 pte_update(mm, addr, ptep);
608 #define flush_tlb_fix_spurious_fault(vma, address)
611 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
613 * dst - pointer to pgd range anwhere on a pgd page
615 * count - the number of pgds to copy.
617 * dst and src can be on the same page, but the range must not overlap,
618 * and must not cross a page boundary.
620 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
622 memcpy(dst, src, count * sizeof(pgd_t));
626 #include <asm-generic/pgtable.h>
627 #endif /* __ASSEMBLY__ */
629 #endif /* _ASM_X86_PGTABLE_H */