1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
4 #define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
5 #define FIRST_USER_ADDRESS 0
7 #define _PAGE_BIT_PRESENT 0
9 #define _PAGE_BIT_USER 2
10 #define _PAGE_BIT_PWT 3
11 #define _PAGE_BIT_PCD 4
12 #define _PAGE_BIT_ACCESSED 5
13 #define _PAGE_BIT_DIRTY 6
14 #define _PAGE_BIT_FILE 6
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_UNUSED2 10
20 #define _PAGE_BIT_UNUSED3 11
21 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
22 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
25 * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
26 * sign-extended value on 32-bit with all 1's in the upper word,
27 * which preserves the upper pte values on 64-bit ptes:
29 #define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
30 #define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
31 #define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
32 #define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
33 #define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
34 #define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
35 #define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
36 #define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
37 #define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
38 #define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
39 #define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
40 #define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
41 #define _PAGE_PAT (_AC(1, L)<<_PAGE_BIT_PAT)
42 #define _PAGE_PAT_LARGE (_AC(1, L)<<_PAGE_BIT_PAT_LARGE)
44 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
45 #define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
50 /* If _PAGE_PRESENT is clear, we use these: */
51 #define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping, 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 | _PAGE_ACCESSED | _PAGE_DIRTY)
56 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
58 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
60 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
61 #define _PAGE_CACHE_WB (0)
62 #define _PAGE_CACHE_WC (_PAGE_PWT)
63 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
64 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
66 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
67 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
69 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
70 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
71 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
72 #define PAGE_COPY PAGE_COPY_NOEXEC
73 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
74 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
77 #define _PAGE_KERNEL_EXEC \
78 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
79 #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
82 extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
83 #endif /* __ASSEMBLY__ */
85 #define __PAGE_KERNEL_EXEC \
86 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
87 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
90 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
91 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
92 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
93 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
94 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
95 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
96 #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
97 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
98 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
101 # define MAKE_GLOBAL(x) __pgprot((x))
103 # define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
106 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
107 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
108 #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
109 #define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
110 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
111 #define PAGE_KERNEL_UC_MINUS MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
112 #define PAGE_KERNEL_EXEC_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
113 #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
114 #define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
115 #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
116 #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
119 #define __P000 PAGE_NONE
120 #define __P001 PAGE_READONLY
121 #define __P010 PAGE_COPY
122 #define __P011 PAGE_COPY
123 #define __P100 PAGE_READONLY_EXEC
124 #define __P101 PAGE_READONLY_EXEC
125 #define __P110 PAGE_COPY_EXEC
126 #define __P111 PAGE_COPY_EXEC
128 #define __S000 PAGE_NONE
129 #define __S001 PAGE_READONLY
130 #define __S010 PAGE_SHARED
131 #define __S011 PAGE_SHARED
132 #define __S100 PAGE_READONLY_EXEC
133 #define __S101 PAGE_READONLY_EXEC
134 #define __S110 PAGE_SHARED_EXEC
135 #define __S111 PAGE_SHARED_EXEC
140 * ZERO_PAGE is a global shared page that is always zero: used
141 * for zero-mapped memory areas etc..
143 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
144 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
146 extern spinlock_t pgd_lock;
147 extern struct list_head pgd_list;
150 * The following only work if pte_present() is true.
151 * Undefined behaviour if not..
153 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
154 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
155 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
156 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
157 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; }
158 static inline int pte_global(pte_t pte) { return pte_val(pte) & _PAGE_GLOBAL; }
159 static inline int pte_exec(pte_t pte) { return !(pte_val(pte) & _PAGE_NX); }
161 static inline int pmd_large(pmd_t pte) {
162 return (pmd_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
163 (_PAGE_PSE|_PAGE_PRESENT);
166 static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY); }
167 static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED); }
168 static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW); }
169 static inline pte_t pte_mkexec(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX); }
170 static inline pte_t pte_mkdirty(pte_t pte) { return __pte(pte_val(pte) | _PAGE_DIRTY); }
171 static inline pte_t pte_mkyoung(pte_t pte) { return __pte(pte_val(pte) | _PAGE_ACCESSED); }
172 static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) | _PAGE_RW); }
173 static inline pte_t pte_mkhuge(pte_t pte) { return __pte(pte_val(pte) | _PAGE_PSE); }
174 static inline pte_t pte_clrhuge(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE); }
175 static inline pte_t pte_mkglobal(pte_t pte) { return __pte(pte_val(pte) | _PAGE_GLOBAL); }
176 static inline pte_t pte_clrglobal(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL); }
178 extern pteval_t __supported_pte_mask;
180 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
182 return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
183 pgprot_val(pgprot)) & __supported_pte_mask);
186 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
188 return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
189 pgprot_val(pgprot)) & __supported_pte_mask);
192 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
194 pteval_t val = pte_val(pte);
197 * Chop off the NX bit (if present), and add the NX portion of
198 * the newprot (if present):
200 val &= _PAGE_CHG_MASK & ~_PAGE_NX;
201 val |= pgprot_val(newprot) & __supported_pte_mask;
206 #define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))
208 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
210 #ifdef CONFIG_PARAVIRT
211 #include <asm/paravirt.h>
212 #else /* !CONFIG_PARAVIRT */
213 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
214 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
216 #define set_pte_present(mm, addr, ptep, pte) \
217 native_set_pte_present(mm, addr, ptep, pte)
218 #define set_pte_atomic(ptep, pte) \
219 native_set_pte_atomic(ptep, pte)
221 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
223 #ifndef __PAGETABLE_PUD_FOLDED
224 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
225 #define pgd_clear(pgd) native_pgd_clear(pgd)
229 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
232 #ifndef __PAGETABLE_PMD_FOLDED
233 #define pud_clear(pud) native_pud_clear(pud)
236 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
237 #define pmd_clear(pmd) native_pmd_clear(pmd)
239 #define pte_update(mm, addr, ptep) do { } while (0)
240 #define pte_update_defer(mm, addr, ptep) do { } while (0)
241 #endif /* CONFIG_PARAVIRT */
243 #endif /* __ASSEMBLY__ */
246 # include "pgtable_32.h"
248 # include "pgtable_64.h"
261 * Helper function that returns the kernel pagetable entry controlling
262 * the virtual address 'address'. NULL means no pagetable entry present.
263 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
266 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
268 /* local pte updates need not use xchg for locking */
269 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
273 /* Pure native function needs no input for mm, addr */
274 native_pte_clear(NULL, 0, ptep);
278 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
279 pte_t *ptep , pte_t pte)
281 native_set_pte(ptep, pte);
284 #ifndef CONFIG_PARAVIRT
286 * Rules for using pte_update - it must be called after any PTE update which
287 * has not been done using the set_pte / clear_pte interfaces. It is used by
288 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
289 * updates should either be sets, clears, or set_pte_atomic for P->P
290 * transitions, which means this hook should only be called for user PTEs.
291 * This hook implies a P->P protection or access change has taken place, which
292 * requires a subsequent TLB flush. The notification can optionally be delayed
293 * until the TLB flush event by using the pte_update_defer form of the
294 * interface, but care must be taken to assure that the flush happens while
295 * still holding the same page table lock so that the shadow and primary pages
296 * do not become out of sync on SMP.
298 #define pte_update(mm, addr, ptep) do { } while (0)
299 #define pte_update_defer(mm, addr, ptep) do { } while (0)
303 * We only update the dirty/accessed state if we set
304 * the dirty bit by hand in the kernel, since the hardware
305 * will do the accessed bit for us, and we don't want to
306 * race with other CPU's that might be updating the dirty
307 * bit at the same time.
309 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
310 #define ptep_set_access_flags(vma, address, ptep, entry, dirty) \
312 int __changed = !pte_same(*(ptep), entry); \
313 if (__changed && dirty) { \
315 pte_update_defer((vma)->vm_mm, (address), (ptep)); \
316 flush_tlb_page(vma, address); \
321 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
322 #define ptep_test_and_clear_young(vma, addr, ptep) ({ \
324 if (pte_young(*(ptep))) \
325 __ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
328 pte_update((vma)->vm_mm, addr, ptep); \
332 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
333 #define ptep_clear_flush_young(vma, address, ptep) \
336 __young = ptep_test_and_clear_young((vma), (address), (ptep)); \
338 flush_tlb_page(vma, address); \
342 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
343 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
345 pte_t pte = native_ptep_get_and_clear(ptep);
346 pte_update(mm, addr, ptep);
350 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
351 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
356 * Full address destruction in progress; paravirt does not
357 * care about updates and native needs no locking
359 pte = native_local_ptep_get_and_clear(ptep);
361 pte = ptep_get_and_clear(mm, addr, ptep);
366 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
367 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
369 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
370 pte_update(mm, addr, ptep);
373 #include <asm-generic/pgtable.h>
374 #endif /* __ASSEMBLY__ */
376 #endif /* _ASM_X86_PGTABLE_H */