c5a08079ad5e8dd3f35985ab3a1c92bdab935ed7
1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_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) | _PAGE_CACHE_UC_MINUS)) \
19 * ZERO_PAGE is a global shared page that is always zero: used
20 * for zero-mapped memory areas etc..
22 extern unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)];
23 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
25 extern spinlock_t pgd_lock
;
26 extern struct list_head pgd_list
;
28 #ifdef CONFIG_PARAVIRT
29 #include <asm/paravirt.h>
30 #else /* !CONFIG_PARAVIRT */
31 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
32 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
34 #define set_pte_atomic(ptep, pte) \
35 native_set_pte_atomic(ptep, pte)
37 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
39 #ifndef __PAGETABLE_PUD_FOLDED
40 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
41 #define pgd_clear(pgd) native_pgd_clear(pgd)
45 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
48 #ifndef __PAGETABLE_PMD_FOLDED
49 #define pud_clear(pud) native_pud_clear(pud)
52 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
53 #define pmd_clear(pmd) native_pmd_clear(pmd)
55 #define pte_update(mm, addr, ptep) do { } while (0)
56 #define pte_update_defer(mm, addr, ptep) do { } while (0)
58 static inline void __init
paravirt_pagetable_setup_start(pgd_t
*base
)
60 native_pagetable_setup_start(base
);
63 static inline void __init
paravirt_pagetable_setup_done(pgd_t
*base
)
65 native_pagetable_setup_done(base
);
68 #define pgd_val(x) native_pgd_val(x)
69 #define __pgd(x) native_make_pgd(x)
71 #ifndef __PAGETABLE_PUD_FOLDED
72 #define pud_val(x) native_pud_val(x)
73 #define __pud(x) native_make_pud(x)
76 #ifndef __PAGETABLE_PMD_FOLDED
77 #define pmd_val(x) native_pmd_val(x)
78 #define __pmd(x) native_make_pmd(x)
81 #define pte_val(x) native_pte_val(x)
82 #define __pte(x) native_make_pte(x)
84 #define arch_end_context_switch(prev) do {} while(0)
86 #endif /* CONFIG_PARAVIRT */
89 * The following only work if pte_present() is true.
90 * Undefined behaviour if not..
92 static inline int pte_dirty(pte_t pte
)
94 return pte_flags(pte
) & _PAGE_DIRTY
;
97 static inline int pte_young(pte_t pte
)
99 return pte_flags(pte
) & _PAGE_ACCESSED
;
102 static inline int pte_write(pte_t pte
)
104 return pte_flags(pte
) & _PAGE_RW
;
107 static inline int pte_file(pte_t pte
)
109 return pte_flags(pte
) & _PAGE_FILE
;
112 static inline int pte_huge(pte_t pte
)
114 return pte_flags(pte
) & _PAGE_PSE
;
117 static inline int pte_global(pte_t pte
)
119 return pte_flags(pte
) & _PAGE_GLOBAL
;
122 static inline int pte_exec(pte_t pte
)
124 return !(pte_flags(pte
) & _PAGE_NX
);
127 static inline int pte_special(pte_t pte
)
129 return pte_flags(pte
) & _PAGE_SPECIAL
;
132 static inline unsigned long pte_pfn(pte_t pte
)
134 return (pte_val(pte
) & 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(unsigned long flags
,
273 unsigned long new_flags
)
276 * Certain new memtypes are not allowed with certain
278 * - request is uncached, return cannot be write-back
279 * - request is write-combine, return cannot be write-back
281 if ((flags
== _PAGE_CACHE_UC_MINUS
&&
282 new_flags
== _PAGE_CACHE_WB
) ||
283 (flags
== _PAGE_CACHE_WC
&&
284 new_flags
== _PAGE_CACHE_WB
)) {
291 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
292 pte_t
*populate_extra_pte(unsigned long vaddr
);
293 #endif /* __ASSEMBLY__ */
296 # include "pgtable_32.h"
298 # include "pgtable_64.h"
302 #include <linux/mm_types.h>
304 static inline int pte_none(pte_t pte
)
309 #define __HAVE_ARCH_PTE_SAME
310 static inline int pte_same(pte_t a
, pte_t b
)
312 return a
.pte
== b
.pte
;
315 static inline int pte_present(pte_t a
)
317 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
);
320 static inline int pte_hidden(pte_t x
)
322 #ifdef CONFIG_KMEMCHECK
323 return pte_flags(x
) & _PAGE_HIDDEN
;
329 static inline int pmd_present(pmd_t pmd
)
331 return pmd_flags(pmd
) & _PAGE_PRESENT
;
334 static inline int pmd_none(pmd_t pmd
)
336 /* Only check low word on 32-bit platforms, since it might be
337 out of sync with upper half. */
338 return (unsigned long)native_pmd_val(pmd
) == 0;
341 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
343 return (unsigned long)__va(pmd_val(pmd
) & PTE_PFN_MASK
);
347 * Currently stuck as a macro due to indirect forward reference to
348 * linux/mmzone.h's __section_mem_map_addr() definition:
350 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
353 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
355 * this macro returns the index of the entry in the pmd page which would
356 * control the given virtual address
358 static inline unsigned pmd_index(unsigned long address
)
360 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
364 * Conversion functions: convert a page and protection to a page entry,
365 * and a page entry and page directory to the page they refer to.
367 * (Currently stuck as a macro because of indirect forward reference
368 * to linux/mm.h:page_to_nid())
370 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
373 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
375 * this function returns the index of the entry in the pte page which would
376 * control the given virtual address
378 static inline unsigned pte_index(unsigned long address
)
380 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
383 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
385 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
388 static inline int pmd_bad(pmd_t pmd
)
390 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
393 static inline unsigned long pages_to_mb(unsigned long npg
)
395 return npg
>> (20 - PAGE_SHIFT
);
398 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
399 remap_pfn_range(vma, vaddr, pfn, size, prot)
401 #if PAGETABLE_LEVELS > 2
402 static inline int pud_none(pud_t pud
)
404 return native_pud_val(pud
) == 0;
407 static inline int pud_present(pud_t pud
)
409 return pud_flags(pud
) & _PAGE_PRESENT
;
412 static inline unsigned long pud_page_vaddr(pud_t pud
)
414 return (unsigned long)__va((unsigned long)pud_val(pud
) & PTE_PFN_MASK
);
418 * Currently stuck as a macro due to indirect forward reference to
419 * linux/mmzone.h's __section_mem_map_addr() definition:
421 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
423 /* Find an entry in the second-level page table.. */
424 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
426 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
429 static inline unsigned long pmd_pfn(pmd_t pmd
)
431 return (pmd_val(pmd
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
434 static inline int pud_large(pud_t pud
)
436 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
437 (_PAGE_PSE
| _PAGE_PRESENT
);
440 static inline int pud_bad(pud_t pud
)
442 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
445 static inline int pud_large(pud_t pud
)
449 #endif /* PAGETABLE_LEVELS > 2 */
451 #if PAGETABLE_LEVELS > 3
452 static inline int pgd_present(pgd_t pgd
)
454 return pgd_flags(pgd
) & _PAGE_PRESENT
;
457 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
459 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
463 * Currently stuck as a macro due to indirect forward reference to
464 * linux/mmzone.h's __section_mem_map_addr() definition:
466 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
468 /* to find an entry in a page-table-directory. */
469 static inline unsigned pud_index(unsigned long address
)
471 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
474 static inline pud_t
*pud_offset(pgd_t
*pgd
, unsigned long address
)
476 return (pud_t
*)pgd_page_vaddr(*pgd
) + pud_index(address
);
479 static inline int pgd_bad(pgd_t pgd
)
481 return (pgd_flags(pgd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
484 static inline int pgd_none(pgd_t pgd
)
486 return !native_pgd_val(pgd
);
488 #endif /* PAGETABLE_LEVELS > 3 */
490 #endif /* __ASSEMBLY__ */
493 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
495 * this macro returns the index of the entry in the pgd page which would
496 * control the given virtual address
498 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
501 * pgd_offset() returns a (pgd_t *)
502 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
504 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
506 * a shortcut which implies the use of the kernel's pgd, instead
509 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
512 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
513 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
517 extern int direct_gbpages
;
519 /* local pte updates need not use xchg for locking */
520 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
524 /* Pure native function needs no input for mm, addr */
525 native_pte_clear(NULL
, 0, ptep
);
529 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
530 pte_t
*ptep
, pte_t pte
)
532 native_set_pte(ptep
, pte
);
535 #ifndef CONFIG_PARAVIRT
537 * Rules for using pte_update - it must be called after any PTE update which
538 * has not been done using the set_pte / clear_pte interfaces. It is used by
539 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
540 * updates should either be sets, clears, or set_pte_atomic for P->P
541 * transitions, which means this hook should only be called for user PTEs.
542 * This hook implies a P->P protection or access change has taken place, which
543 * requires a subsequent TLB flush. The notification can optionally be delayed
544 * until the TLB flush event by using the pte_update_defer form of the
545 * interface, but care must be taken to assure that the flush happens while
546 * still holding the same page table lock so that the shadow and primary pages
547 * do not become out of sync on SMP.
549 #define pte_update(mm, addr, ptep) do { } while (0)
550 #define pte_update_defer(mm, addr, ptep) do { } while (0)
554 * We only update the dirty/accessed state if we set
555 * the dirty bit by hand in the kernel, since the hardware
556 * will do the accessed bit for us, and we don't want to
557 * race with other CPU's that might be updating the dirty
558 * bit at the same time.
560 struct vm_area_struct
;
562 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
563 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
564 unsigned long address
, pte_t
*ptep
,
565 pte_t entry
, int dirty
);
567 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
568 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
569 unsigned long addr
, pte_t
*ptep
);
571 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
572 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
573 unsigned long address
, pte_t
*ptep
);
575 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
576 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
579 pte_t pte
= native_ptep_get_and_clear(ptep
);
580 pte_update(mm
, addr
, ptep
);
584 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
585 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
586 unsigned long addr
, pte_t
*ptep
,
592 * Full address destruction in progress; paravirt does not
593 * care about updates and native needs no locking
595 pte
= native_local_ptep_get_and_clear(ptep
);
597 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
602 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
603 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
604 unsigned long addr
, pte_t
*ptep
)
606 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
607 pte_update(mm
, addr
, ptep
);
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 */
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