1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
6 #define FIRST_USER_ADDRESS 0
8 #define _PAGE_BIT_PRESENT 0 /* is present */
9 #define _PAGE_BIT_RW 1 /* writeable */
10 #define _PAGE_BIT_USER 2 /* userspace addressable */
11 #define _PAGE_BIT_PWT 3 /* page write through */
12 #define _PAGE_BIT_PCD 4 /* page cache disabled */
13 #define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
14 #define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
15 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
16 #define _PAGE_BIT_PAT 7 /* on 4KB pages */
17 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
18 #define _PAGE_BIT_UNUSED1 9 /* available for programmer */
19 #define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
20 #define _PAGE_BIT_UNUSED3 11
21 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
22 #define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
23 #define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
24 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
26 /* If _PAGE_BIT_PRESENT is clear, we use these: */
27 /* - if the user mapped it with PROT_NONE; pte_present gives true */
28 #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
29 /* - set: nonlinear file mapping, saved PTE; unset:swap */
30 #define _PAGE_BIT_FILE _PAGE_BIT_DIRTY
32 #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
33 #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
34 #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
35 #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
36 #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
37 #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
38 #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
39 #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
40 #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
41 #define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
42 #define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
43 #define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
44 #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
45 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
46 #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
47 #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
48 #define __HAVE_ARCH_PTE_SPECIAL
50 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
51 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
53 #define _PAGE_NX (_AT(pteval_t, 0))
56 #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
57 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
59 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
60 _PAGE_ACCESSED | _PAGE_DIRTY)
61 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
64 /* Set of bits not changed in pte_modify */
65 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
66 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
68 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
69 #define _PAGE_CACHE_WB (0)
70 #define _PAGE_CACHE_WC (_PAGE_PWT)
71 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
72 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
74 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
75 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
76 _PAGE_ACCESSED | _PAGE_NX)
78 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
79 _PAGE_USER | _PAGE_ACCESSED)
80 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
81 _PAGE_ACCESSED | _PAGE_NX)
82 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
84 #define PAGE_COPY PAGE_COPY_NOEXEC
85 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
86 _PAGE_ACCESSED | _PAGE_NX)
87 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
90 #define __PAGE_KERNEL_EXEC \
91 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
92 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
94 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
95 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
96 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
97 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
98 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
99 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
100 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
101 #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
102 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
103 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
104 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
106 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
107 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
108 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
109 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
111 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
112 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
113 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
114 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
115 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
116 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
117 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
118 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
119 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
120 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
121 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
122 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
123 #define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
125 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
126 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
127 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
128 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
131 #define __P000 PAGE_NONE
132 #define __P001 PAGE_READONLY
133 #define __P010 PAGE_COPY
134 #define __P011 PAGE_COPY
135 #define __P100 PAGE_READONLY_EXEC
136 #define __P101 PAGE_READONLY_EXEC
137 #define __P110 PAGE_COPY_EXEC
138 #define __P111 PAGE_COPY_EXEC
140 #define __S000 PAGE_NONE
141 #define __S001 PAGE_READONLY
142 #define __S010 PAGE_SHARED
143 #define __S011 PAGE_SHARED
144 #define __S100 PAGE_READONLY_EXEC
145 #define __S101 PAGE_READONLY_EXEC
146 #define __S110 PAGE_SHARED_EXEC
147 #define __S111 PAGE_SHARED_EXEC
150 * early identity mapping pte attrib macros.
153 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
156 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
157 * bits are combined, this will alow user to access the high address mapped
158 * VDSO in the presence of CONFIG_COMPAT_VDSO
160 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
161 #define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
162 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
166 * Macro to mark a page protection value as UC-
168 #define pgprot_noncached(prot) \
169 ((boot_cpu_data.x86 > 3) \
170 ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \
175 #define pgprot_writecombine pgprot_writecombine
176 extern pgprot_t pgprot_writecombine(pgprot_t prot);
179 * ZERO_PAGE is a global shared page that is always zero: used
180 * for zero-mapped memory areas etc..
182 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
183 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
185 extern spinlock_t pgd_lock;
186 extern struct list_head pgd_list;
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
192 static inline int pte_dirty(pte_t pte)
194 return pte_flags(pte) & _PAGE_DIRTY;
197 static inline int pte_young(pte_t pte)
199 return pte_flags(pte) & _PAGE_ACCESSED;
202 static inline int pte_write(pte_t pte)
204 return pte_flags(pte) & _PAGE_RW;
207 static inline int pte_file(pte_t pte)
209 return pte_flags(pte) & _PAGE_FILE;
212 static inline int pte_huge(pte_t pte)
214 return pte_flags(pte) & _PAGE_PSE;
217 static inline int pte_global(pte_t pte)
219 return pte_flags(pte) & _PAGE_GLOBAL;
222 static inline int pte_exec(pte_t pte)
224 return !(pte_flags(pte) & _PAGE_NX);
227 static inline int pte_special(pte_t pte)
229 return pte_flags(pte) & _PAGE_SPECIAL;
232 static inline unsigned long pte_pfn(pte_t pte)
234 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
237 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
239 static inline int pmd_large(pmd_t pte)
241 return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
242 (_PAGE_PSE | _PAGE_PRESENT);
245 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
247 pteval_t v = native_pte_val(pte);
249 return native_make_pte(v | set);
252 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
254 pteval_t v = native_pte_val(pte);
256 return native_make_pte(v & ~clear);
259 static inline pte_t pte_mkclean(pte_t pte)
261 return pte_clear_flags(pte, _PAGE_DIRTY);
264 static inline pte_t pte_mkold(pte_t pte)
266 return pte_clear_flags(pte, _PAGE_ACCESSED);
269 static inline pte_t pte_wrprotect(pte_t pte)
271 return pte_clear_flags(pte, _PAGE_RW);
274 static inline pte_t pte_mkexec(pte_t pte)
276 return pte_clear_flags(pte, _PAGE_NX);
279 static inline pte_t pte_mkdirty(pte_t pte)
281 return pte_set_flags(pte, _PAGE_DIRTY);
284 static inline pte_t pte_mkyoung(pte_t pte)
286 return pte_set_flags(pte, _PAGE_ACCESSED);
289 static inline pte_t pte_mkwrite(pte_t pte)
291 return pte_set_flags(pte, _PAGE_RW);
294 static inline pte_t pte_mkhuge(pte_t pte)
296 return pte_set_flags(pte, _PAGE_PSE);
299 static inline pte_t pte_clrhuge(pte_t pte)
301 return pte_clear_flags(pte, _PAGE_PSE);
304 static inline pte_t pte_mkglobal(pte_t pte)
306 return pte_set_flags(pte, _PAGE_GLOBAL);
309 static inline pte_t pte_clrglobal(pte_t pte)
311 return pte_clear_flags(pte, _PAGE_GLOBAL);
314 static inline pte_t pte_mkspecial(pte_t pte)
316 return pte_set_flags(pte, _PAGE_SPECIAL);
319 extern pteval_t __supported_pte_mask;
322 * Mask out unsupported bits in a present pgprot. Non-present pgprots
323 * can use those bits for other purposes, so leave them be.
325 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
327 pgprotval_t protval = pgprot_val(pgprot);
329 if (protval & _PAGE_PRESENT)
330 protval &= __supported_pte_mask;
335 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
337 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
338 massage_pgprot(pgprot));
341 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
343 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
344 massage_pgprot(pgprot));
347 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
349 pteval_t val = pte_val(pte);
352 * Chop off the NX bit (if present), and add the NX portion of
353 * the newprot (if present):
355 val &= _PAGE_CHG_MASK;
356 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
361 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
362 #define pgprot_modify pgprot_modify
363 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
365 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
366 pgprotval_t addbits = pgprot_val(newprot);
367 return __pgprot(preservebits | addbits);
370 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
372 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
374 static inline int is_new_memtype_allowed(unsigned long flags,
375 unsigned long new_flags)
378 * Certain new memtypes are not allowed with certain
380 * - request is uncached, return cannot be write-back
381 * - request is write-combine, return cannot be write-back
383 if ((flags == _PAGE_CACHE_UC_MINUS &&
384 new_flags == _PAGE_CACHE_WB) ||
385 (flags == _PAGE_CACHE_WC &&
386 new_flags == _PAGE_CACHE_WB)) {
394 /* Indicate that x86 has its own track and untrack pfn vma functions */
395 #define __HAVE_PFNMAP_TRACKING
397 #define __HAVE_PHYS_MEM_ACCESS_PROT
399 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
400 unsigned long size, pgprot_t vma_prot);
401 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
402 unsigned long size, pgprot_t *vma_prot);
405 /* Install a pte for a particular vaddr in kernel space. */
406 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
409 extern void native_pagetable_setup_start(pgd_t *base);
410 extern void native_pagetable_setup_done(pgd_t *base);
412 static inline void native_pagetable_setup_start(pgd_t *base) {}
413 static inline void native_pagetable_setup_done(pgd_t *base) {}
417 extern void arch_report_meminfo(struct seq_file *m);
419 #ifdef CONFIG_PARAVIRT
420 #include <asm/paravirt.h>
421 #else /* !CONFIG_PARAVIRT */
422 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
423 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
425 #define set_pte_present(mm, addr, ptep, pte) \
426 native_set_pte_present(mm, addr, ptep, pte)
427 #define set_pte_atomic(ptep, pte) \
428 native_set_pte_atomic(ptep, pte)
430 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
432 #ifndef __PAGETABLE_PUD_FOLDED
433 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
434 #define pgd_clear(pgd) native_pgd_clear(pgd)
438 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
441 #ifndef __PAGETABLE_PMD_FOLDED
442 #define pud_clear(pud) native_pud_clear(pud)
445 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
446 #define pmd_clear(pmd) native_pmd_clear(pmd)
448 #define pte_update(mm, addr, ptep) do { } while (0)
449 #define pte_update_defer(mm, addr, ptep) do { } while (0)
451 static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
453 native_pagetable_setup_start(base);
456 static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
458 native_pagetable_setup_done(base);
460 #endif /* CONFIG_PARAVIRT */
462 #endif /* __ASSEMBLY__ */
465 # include "pgtable_32.h"
467 # include "pgtable_64.h"
471 #include <linux/mm_types.h>
473 static inline int pte_none(pte_t pte)
478 #define __HAVE_ARCH_PTE_SAME
479 static inline int pte_same(pte_t a, pte_t b)
481 return a.pte == b.pte;
484 static inline int pte_present(pte_t a)
486 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
489 static inline int pmd_present(pmd_t pmd)
491 return pmd_flags(pmd) & _PAGE_PRESENT;
494 static inline int pmd_none(pmd_t pmd)
496 /* Only check low word on 32-bit platforms, since it might be
497 out of sync with upper half. */
498 return (unsigned long)native_pmd_val(pmd) == 0;
501 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
503 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
507 * Currently stuck as a macro due to indirect forward reference to
508 * linux/mmzone.h's __section_mem_map_addr() definition:
510 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
513 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
515 * this macro returns the index of the entry in the pmd page which would
516 * control the given virtual address
518 static inline unsigned pmd_index(unsigned long address)
520 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
524 * Conversion functions: convert a page and protection to a page entry,
525 * and a page entry and page directory to the page they refer to.
527 * (Currently stuck as a macro because of indirect forward reference
528 * to linux/mm.h:page_to_nid())
530 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
533 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
535 * this function returns the index of the entry in the pte page which would
536 * control the given virtual address
538 static inline unsigned pte_index(unsigned long address)
540 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
543 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
545 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
548 static inline int pmd_bad(pmd_t pmd)
550 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
553 static inline unsigned long pages_to_mb(unsigned long npg)
555 return npg >> (20 - PAGE_SHIFT);
558 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
559 remap_pfn_range(vma, vaddr, pfn, size, prot)
561 #if PAGETABLE_LEVELS == 2
562 static inline int pud_large(pud_t pud)
568 #if PAGETABLE_LEVELS > 2
569 static inline int pud_none(pud_t pud)
571 return native_pud_val(pud) == 0;
574 static inline int pud_present(pud_t pud)
576 return pud_flags(pud) & _PAGE_PRESENT;
579 static inline unsigned long pud_page_vaddr(pud_t pud)
581 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
585 * Currently stuck as a macro due to indirect forward reference to
586 * linux/mmzone.h's __section_mem_map_addr() definition:
588 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
590 /* Find an entry in the second-level page table.. */
591 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
593 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
596 static inline unsigned long pmd_pfn(pmd_t pmd)
598 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
601 static inline int pud_large(pud_t pud)
603 return (pud_flags(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
604 (_PAGE_PSE | _PAGE_PRESENT);
607 static inline int pud_bad(pud_t pud)
609 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
611 #endif /* PAGETABLE_LEVELS > 2 */
613 #if PAGETABLE_LEVELS > 3
614 static inline int pgd_present(pgd_t pgd)
616 return pgd_flags(pgd) & _PAGE_PRESENT;
619 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
621 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
625 * Currently stuck as a macro due to indirect forward reference to
626 * linux/mmzone.h's __section_mem_map_addr() definition:
628 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
630 /* to find an entry in a page-table-directory. */
631 static inline unsigned pud_index(unsigned long address)
633 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
636 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
638 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
641 static inline int pgd_bad(pgd_t pgd)
643 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
646 static inline int pgd_none(pgd_t pgd)
648 return !native_pgd_val(pgd);
650 #endif /* PAGETABLE_LEVELS > 3 */
652 #endif /* __ASSEMBLY__ */
655 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
657 * this macro returns the index of the entry in the pgd page which would
658 * control the given virtual address
660 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
663 * pgd_offset() returns a (pgd_t *)
664 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
666 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
668 * a shortcut which implies the use of the kernel's pgd, instead
671 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
674 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
675 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
687 #ifdef CONFIG_PROC_FS
688 extern void update_page_count(int level, unsigned long pages);
690 static inline void update_page_count(int level, unsigned long pages) { }
694 * Helper function that returns the kernel pagetable entry controlling
695 * the virtual address 'address'. NULL means no pagetable entry present.
696 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
699 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
701 /* local pte updates need not use xchg for locking */
702 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
706 /* Pure native function needs no input for mm, addr */
707 native_pte_clear(NULL, 0, ptep);
711 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
712 pte_t *ptep , pte_t pte)
714 native_set_pte(ptep, pte);
717 #ifndef CONFIG_PARAVIRT
719 * Rules for using pte_update - it must be called after any PTE update which
720 * has not been done using the set_pte / clear_pte interfaces. It is used by
721 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
722 * updates should either be sets, clears, or set_pte_atomic for P->P
723 * transitions, which means this hook should only be called for user PTEs.
724 * This hook implies a P->P protection or access change has taken place, which
725 * requires a subsequent TLB flush. The notification can optionally be delayed
726 * until the TLB flush event by using the pte_update_defer form of the
727 * interface, but care must be taken to assure that the flush happens while
728 * still holding the same page table lock so that the shadow and primary pages
729 * do not become out of sync on SMP.
731 #define pte_update(mm, addr, ptep) do { } while (0)
732 #define pte_update_defer(mm, addr, ptep) do { } while (0)
736 * We only update the dirty/accessed state if we set
737 * the dirty bit by hand in the kernel, since the hardware
738 * will do the accessed bit for us, and we don't want to
739 * race with other CPU's that might be updating the dirty
740 * bit at the same time.
742 struct vm_area_struct;
744 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
745 extern int ptep_set_access_flags(struct vm_area_struct *vma,
746 unsigned long address, pte_t *ptep,
747 pte_t entry, int dirty);
749 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
750 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
751 unsigned long addr, pte_t *ptep);
753 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
754 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
755 unsigned long address, pte_t *ptep);
757 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
758 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
761 pte_t pte = native_ptep_get_and_clear(ptep);
762 pte_update(mm, addr, ptep);
766 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
767 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
768 unsigned long addr, pte_t *ptep,
774 * Full address destruction in progress; paravirt does not
775 * care about updates and native needs no locking
777 pte = native_local_ptep_get_and_clear(ptep);
779 pte = ptep_get_and_clear(mm, addr, ptep);
784 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
785 static inline void ptep_set_wrprotect(struct mm_struct *mm,
786 unsigned long addr, pte_t *ptep)
788 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
789 pte_update(mm, addr, ptep);
793 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
795 * dst - pointer to pgd range anwhere on a pgd page
797 * count - the number of pgds to copy.
799 * dst and src can be on the same page, but the range must not overlap,
800 * and must not cross a page boundary.
802 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
804 memcpy(dst, src, count * sizeof(pgd_t));
808 #include <asm-generic/pgtable.h>
809 #endif /* __ASSEMBLY__ */
811 #endif /* _ASM_X86_PGTABLE_H */