1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
4 #define FIRST_USER_ADDRESS 0
6 #define _PAGE_BIT_PRESENT 0 /* is present */
7 #define _PAGE_BIT_RW 1 /* writeable */
8 #define _PAGE_BIT_USER 2 /* userspace addressable */
9 #define _PAGE_BIT_PWT 3 /* page write through */
10 #define _PAGE_BIT_PCD 4 /* page cache disabled */
11 #define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
12 #define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
13 #define _PAGE_BIT_FILE 6
14 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
15 #define _PAGE_BIT_PAT 7 /* on 4KB pages */
16 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
17 #define _PAGE_BIT_UNUSED1 9 /* available for programmer */
18 #define _PAGE_BIT_UNUSED2 10
19 #define _PAGE_BIT_UNUSED3 11
20 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
21 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
24 * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
25 * sign-extended value on 32-bit with all 1's in the upper word,
26 * which preserves the upper pte values on 64-bit ptes:
28 #define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
29 #define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
30 #define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
31 #define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
32 #define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
33 #define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
34 #define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
35 #define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
36 #define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
37 #define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
38 #define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
39 #define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
40 #define _PAGE_PAT (_AC(1, L)<<_PAGE_BIT_PAT)
41 #define _PAGE_PAT_LARGE (_AC(1, L)<<_PAGE_BIT_PAT_LARGE)
43 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
44 #define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
49 /* If _PAGE_PRESENT is clear, we use these: */
50 #define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
51 * saved PTE; unset:swap */
52 #define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
53 pte_present gives true */
55 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
56 _PAGE_ACCESSED | _PAGE_DIRTY)
57 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
60 /* Set of bits not changed in pte_modify */
61 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_PCD | _PAGE_PWT | \
62 _PAGE_ACCESSED | _PAGE_DIRTY)
64 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
65 #define _PAGE_CACHE_WB (0)
66 #define _PAGE_CACHE_WC (_PAGE_PWT)
67 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
68 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
70 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
71 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
72 _PAGE_ACCESSED | _PAGE_NX)
74 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
75 _PAGE_USER | _PAGE_ACCESSED)
76 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
77 _PAGE_ACCESSED | _PAGE_NX)
78 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
80 #define PAGE_COPY PAGE_COPY_NOEXEC
81 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
82 _PAGE_ACCESSED | _PAGE_NX)
83 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
87 #define _PAGE_KERNEL_EXEC \
88 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
89 #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
92 extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
93 #endif /* __ASSEMBLY__ */
95 #define __PAGE_KERNEL_EXEC \
96 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
97 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
100 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
101 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
102 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
103 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
104 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
105 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
106 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
107 #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
108 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
109 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
112 # define MAKE_GLOBAL(x) __pgprot((x))
114 # define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
117 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
118 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
119 #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
120 #define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
121 #define PAGE_KERNEL_WC MAKE_GLOBAL(__PAGE_KERNEL_WC)
122 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
123 #define PAGE_KERNEL_UC_MINUS MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
124 #define PAGE_KERNEL_EXEC_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
125 #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
126 #define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
127 #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
128 #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
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
152 * ZERO_PAGE is a global shared page that is always zero: used
153 * for zero-mapped memory areas etc..
155 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
156 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
158 extern spinlock_t pgd_lock;
159 extern struct list_head pgd_list;
162 * The following only work if pte_present() is true.
163 * Undefined behaviour if not..
165 static inline int pte_dirty(pte_t pte)
167 return pte_val(pte) & _PAGE_DIRTY;
170 static inline int pte_young(pte_t pte)
172 return pte_val(pte) & _PAGE_ACCESSED;
175 static inline int pte_write(pte_t pte)
177 return pte_val(pte) & _PAGE_RW;
180 static inline int pte_file(pte_t pte)
182 return pte_val(pte) & _PAGE_FILE;
185 static inline int pte_huge(pte_t pte)
187 return pte_val(pte) & _PAGE_PSE;
190 static inline int pte_global(pte_t pte)
192 return pte_val(pte) & _PAGE_GLOBAL;
195 static inline int pte_exec(pte_t pte)
197 return !(pte_val(pte) & _PAGE_NX);
200 static inline int pte_special(pte_t pte)
205 static inline int pmd_large(pmd_t pte)
207 return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
208 (_PAGE_PSE | _PAGE_PRESENT);
211 static inline pte_t pte_mkclean(pte_t pte)
213 return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY);
216 static inline pte_t pte_mkold(pte_t pte)
218 return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED);
221 static inline pte_t pte_wrprotect(pte_t pte)
223 return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW);
226 static inline pte_t pte_mkexec(pte_t pte)
228 return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX);
231 static inline pte_t pte_mkdirty(pte_t pte)
233 return __pte(pte_val(pte) | _PAGE_DIRTY);
236 static inline pte_t pte_mkyoung(pte_t pte)
238 return __pte(pte_val(pte) | _PAGE_ACCESSED);
241 static inline pte_t pte_mkwrite(pte_t pte)
243 return __pte(pte_val(pte) | _PAGE_RW);
246 static inline pte_t pte_mkhuge(pte_t pte)
248 return __pte(pte_val(pte) | _PAGE_PSE);
251 static inline pte_t pte_clrhuge(pte_t pte)
253 return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE);
256 static inline pte_t pte_mkglobal(pte_t pte)
258 return __pte(pte_val(pte) | _PAGE_GLOBAL);
261 static inline pte_t pte_clrglobal(pte_t pte)
263 return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL);
266 static inline pte_t pte_mkspecial(pte_t pte)
271 extern pteval_t __supported_pte_mask;
273 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
275 return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
276 pgprot_val(pgprot)) & __supported_pte_mask);
279 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
281 return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
282 pgprot_val(pgprot)) & __supported_pte_mask);
285 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
287 pteval_t val = pte_val(pte);
290 * Chop off the NX bit (if present), and add the NX portion of
291 * the newprot (if present):
293 val &= _PAGE_CHG_MASK;
294 val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
299 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
300 #define pgprot_modify pgprot_modify
301 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
303 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
304 pgprotval_t addbits = pgprot_val(newprot);
305 return __pgprot(preservebits | addbits);
308 #define pte_pgprot(x) __pgprot(pte_val(x) & ~PTE_MASK)
310 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
313 #define __HAVE_PHYS_MEM_ACCESS_PROT
315 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
316 unsigned long size, pgprot_t vma_prot);
317 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
318 unsigned long size, pgprot_t *vma_prot);
321 #ifdef CONFIG_PARAVIRT
322 #include <asm/paravirt.h>
323 #else /* !CONFIG_PARAVIRT */
324 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
325 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
327 #define set_pte_present(mm, addr, ptep, pte) \
328 native_set_pte_present(mm, addr, ptep, pte)
329 #define set_pte_atomic(ptep, pte) \
330 native_set_pte_atomic(ptep, pte)
332 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
334 #ifndef __PAGETABLE_PUD_FOLDED
335 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
336 #define pgd_clear(pgd) native_pgd_clear(pgd)
340 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
343 #ifndef __PAGETABLE_PMD_FOLDED
344 #define pud_clear(pud) native_pud_clear(pud)
347 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
348 #define pmd_clear(pmd) native_pmd_clear(pmd)
350 #define pte_update(mm, addr, ptep) do { } while (0)
351 #define pte_update_defer(mm, addr, ptep) do { } while (0)
352 #endif /* CONFIG_PARAVIRT */
354 #endif /* __ASSEMBLY__ */
357 # include "pgtable_32.h"
359 # include "pgtable_64.h"
362 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
363 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
375 * Helper function that returns the kernel pagetable entry controlling
376 * the virtual address 'address'. NULL means no pagetable entry present.
377 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
380 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
382 /* local pte updates need not use xchg for locking */
383 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
387 /* Pure native function needs no input for mm, addr */
388 native_pte_clear(NULL, 0, ptep);
392 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
393 pte_t *ptep , pte_t pte)
395 native_set_pte(ptep, pte);
398 #ifndef CONFIG_PARAVIRT
400 * Rules for using pte_update - it must be called after any PTE update which
401 * has not been done using the set_pte / clear_pte interfaces. It is used by
402 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
403 * updates should either be sets, clears, or set_pte_atomic for P->P
404 * transitions, which means this hook should only be called for user PTEs.
405 * This hook implies a P->P protection or access change has taken place, which
406 * requires a subsequent TLB flush. The notification can optionally be delayed
407 * until the TLB flush event by using the pte_update_defer form of the
408 * interface, but care must be taken to assure that the flush happens while
409 * still holding the same page table lock so that the shadow and primary pages
410 * do not become out of sync on SMP.
412 #define pte_update(mm, addr, ptep) do { } while (0)
413 #define pte_update_defer(mm, addr, ptep) do { } while (0)
417 * We only update the dirty/accessed state if we set
418 * the dirty bit by hand in the kernel, since the hardware
419 * will do the accessed bit for us, and we don't want to
420 * race with other CPU's that might be updating the dirty
421 * bit at the same time.
423 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
424 extern int ptep_set_access_flags(struct vm_area_struct *vma,
425 unsigned long address, pte_t *ptep,
426 pte_t entry, int dirty);
428 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
429 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
430 unsigned long addr, pte_t *ptep);
432 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
433 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
434 unsigned long address, pte_t *ptep);
436 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
437 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
440 pte_t pte = native_ptep_get_and_clear(ptep);
441 pte_update(mm, addr, ptep);
445 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
446 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
447 unsigned long addr, pte_t *ptep,
453 * Full address destruction in progress; paravirt does not
454 * care about updates and native needs no locking
456 pte = native_local_ptep_get_and_clear(ptep);
458 pte = ptep_get_and_clear(mm, addr, ptep);
463 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
464 static inline void ptep_set_wrprotect(struct mm_struct *mm,
465 unsigned long addr, pte_t *ptep)
467 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
468 pte_update(mm, addr, ptep);
472 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
474 * dst - pointer to pgd range anwhere on a pgd page
476 * count - the number of pgds to copy.
478 * dst and src can be on the same page, but the range must not overlap,
479 * and must not cross a page boundary.
481 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
483 memcpy(dst, src, count * sizeof(pgd_t));
487 #include <asm-generic/pgtable.h>
488 #endif /* __ASSEMBLY__ */
490 #endif /* _ASM_X86_PGTABLE_H */