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1 | #ifndef _ASM_X86_PGTABLE_H | |
2 | #define _ASM_X86_PGTABLE_H | |
3 | ||
4 | #define FIRST_USER_ADDRESS 0 | |
5 | ||
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 */ | |
22 | ||
23 | /* | |
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: | |
27 | */ | |
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) | |
42 | ||
43 | #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) | |
44 | #define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX) | |
45 | #else | |
46 | #define _PAGE_NX 0 | |
47 | #endif | |
48 | ||
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 */ | |
54 | ||
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 | \ | |
58 | _PAGE_DIRTY) | |
59 | ||
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) | |
63 | ||
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) | |
69 | ||
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) | |
73 | ||
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 | \ | |
79 | _PAGE_ACCESSED) | |
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 | \ | |
84 | _PAGE_ACCESSED) | |
85 | ||
86 | #ifdef CONFIG_X86_32 | |
87 | #define _PAGE_KERNEL_EXEC \ | |
88 | (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) | |
89 | #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX) | |
90 | ||
91 | #ifndef __ASSEMBLY__ | |
92 | extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC; | |
93 | #endif /* __ASSEMBLY__ */ | |
94 | #else | |
95 | #define __PAGE_KERNEL_EXEC \ | |
96 | (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) | |
97 | #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX) | |
98 | #endif | |
99 | ||
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) | |
110 | ||
111 | #ifdef CONFIG_X86_32 | |
112 | # define MAKE_GLOBAL(x) __pgprot((x)) | |
113 | #else | |
114 | # define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL) | |
115 | #endif | |
116 | ||
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) | |
129 | ||
130 | /* xwr */ | |
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 | |
139 | ||
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 | |
148 | ||
149 | #ifndef __ASSEMBLY__ | |
150 | ||
151 | /* | |
152 | * ZERO_PAGE is a global shared page that is always zero: used | |
153 | * for zero-mapped memory areas etc.. | |
154 | */ | |
155 | extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; | |
156 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) | |
157 | ||
158 | extern spinlock_t pgd_lock; | |
159 | extern struct list_head pgd_list; | |
160 | ||
161 | /* | |
162 | * The following only work if pte_present() is true. | |
163 | * Undefined behaviour if not.. | |
164 | */ | |
165 | static inline int pte_dirty(pte_t pte) | |
166 | { | |
167 | return pte_val(pte) & _PAGE_DIRTY; | |
168 | } | |
169 | ||
170 | static inline int pte_young(pte_t pte) | |
171 | { | |
172 | return pte_val(pte) & _PAGE_ACCESSED; | |
173 | } | |
174 | ||
175 | static inline int pte_write(pte_t pte) | |
176 | { | |
177 | return pte_val(pte) & _PAGE_RW; | |
178 | } | |
179 | ||
180 | static inline int pte_file(pte_t pte) | |
181 | { | |
182 | return pte_val(pte) & _PAGE_FILE; | |
183 | } | |
184 | ||
185 | static inline int pte_huge(pte_t pte) | |
186 | { | |
187 | return pte_val(pte) & _PAGE_PSE; | |
188 | } | |
189 | ||
190 | static inline int pte_global(pte_t pte) | |
191 | { | |
192 | return pte_val(pte) & _PAGE_GLOBAL; | |
193 | } | |
194 | ||
195 | static inline int pte_exec(pte_t pte) | |
196 | { | |
197 | return !(pte_val(pte) & _PAGE_NX); | |
198 | } | |
199 | ||
200 | static inline int pte_special(pte_t pte) | |
201 | { | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static inline int pmd_large(pmd_t pte) | |
206 | { | |
207 | return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) == | |
208 | (_PAGE_PSE | _PAGE_PRESENT); | |
209 | } | |
210 | ||
211 | static inline pte_t pte_mkclean(pte_t pte) | |
212 | { | |
213 | return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY); | |
214 | } | |
215 | ||
216 | static inline pte_t pte_mkold(pte_t pte) | |
217 | { | |
218 | return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED); | |
219 | } | |
220 | ||
221 | static inline pte_t pte_wrprotect(pte_t pte) | |
222 | { | |
223 | return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW); | |
224 | } | |
225 | ||
226 | static inline pte_t pte_mkexec(pte_t pte) | |
227 | { | |
228 | return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX); | |
229 | } | |
230 | ||
231 | static inline pte_t pte_mkdirty(pte_t pte) | |
232 | { | |
233 | return __pte(pte_val(pte) | _PAGE_DIRTY); | |
234 | } | |
235 | ||
236 | static inline pte_t pte_mkyoung(pte_t pte) | |
237 | { | |
238 | return __pte(pte_val(pte) | _PAGE_ACCESSED); | |
239 | } | |
240 | ||
241 | static inline pte_t pte_mkwrite(pte_t pte) | |
242 | { | |
243 | return __pte(pte_val(pte) | _PAGE_RW); | |
244 | } | |
245 | ||
246 | static inline pte_t pte_mkhuge(pte_t pte) | |
247 | { | |
248 | return __pte(pte_val(pte) | _PAGE_PSE); | |
249 | } | |
250 | ||
251 | static inline pte_t pte_clrhuge(pte_t pte) | |
252 | { | |
253 | return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE); | |
254 | } | |
255 | ||
256 | static inline pte_t pte_mkglobal(pte_t pte) | |
257 | { | |
258 | return __pte(pte_val(pte) | _PAGE_GLOBAL); | |
259 | } | |
260 | ||
261 | static inline pte_t pte_clrglobal(pte_t pte) | |
262 | { | |
263 | return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL); | |
264 | } | |
265 | ||
266 | static inline pte_t pte_mkspecial(pte_t pte) | |
267 | { | |
268 | return pte; | |
269 | } | |
270 | ||
271 | extern pteval_t __supported_pte_mask; | |
272 | ||
273 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
274 | { | |
275 | return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) | | |
276 | pgprot_val(pgprot)) & __supported_pte_mask); | |
277 | } | |
278 | ||
279 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) | |
280 | { | |
281 | return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) | | |
282 | pgprot_val(pgprot)) & __supported_pte_mask); | |
283 | } | |
284 | ||
285 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
286 | { | |
287 | pteval_t val = pte_val(pte); | |
288 | ||
289 | /* | |
290 | * Chop off the NX bit (if present), and add the NX portion of | |
291 | * the newprot (if present): | |
292 | */ | |
293 | val &= _PAGE_CHG_MASK; | |
294 | val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask; | |
295 | ||
296 | return __pte(val); | |
297 | } | |
298 | ||
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) | |
302 | { | |
303 | pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; | |
304 | pgprotval_t addbits = pgprot_val(newprot); | |
305 | return __pgprot(preservebits | addbits); | |
306 | } | |
307 | ||
308 | #define pte_pgprot(x) __pgprot(pte_val(x) & ~PTE_MASK) | |
309 | ||
310 | #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask) | |
311 | ||
312 | #ifndef __ASSEMBLY__ | |
313 | #define __HAVE_PHYS_MEM_ACCESS_PROT | |
314 | struct file; | |
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); | |
319 | #endif | |
320 | ||
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) | |
326 | ||
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) | |
331 | ||
332 | #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) | |
333 | ||
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) | |
337 | #endif | |
338 | ||
339 | #ifndef set_pud | |
340 | # define set_pud(pudp, pud) native_set_pud(pudp, pud) | |
341 | #endif | |
342 | ||
343 | #ifndef __PAGETABLE_PMD_FOLDED | |
344 | #define pud_clear(pud) native_pud_clear(pud) | |
345 | #endif | |
346 | ||
347 | #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) | |
348 | #define pmd_clear(pmd) native_pmd_clear(pmd) | |
349 | ||
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 */ | |
353 | ||
354 | #endif /* __ASSEMBLY__ */ | |
355 | ||
356 | #ifdef CONFIG_X86_32 | |
357 | # include "pgtable_32.h" | |
358 | #else | |
359 | # include "pgtable_64.h" | |
360 | #endif | |
361 | ||
362 | #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) | |
363 | #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) | |
364 | ||
365 | #ifndef __ASSEMBLY__ | |
366 | ||
367 | enum { | |
368 | PG_LEVEL_NONE, | |
369 | PG_LEVEL_4K, | |
370 | PG_LEVEL_2M, | |
371 | PG_LEVEL_1G, | |
372 | }; | |
373 | ||
374 | /* | |
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 | |
378 | * as a pte too. | |
379 | */ | |
380 | extern pte_t *lookup_address(unsigned long address, unsigned int *level); | |
381 | ||
382 | /* local pte updates need not use xchg for locking */ | |
383 | static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) | |
384 | { | |
385 | pte_t res = *ptep; | |
386 | ||
387 | /* Pure native function needs no input for mm, addr */ | |
388 | native_pte_clear(NULL, 0, ptep); | |
389 | return res; | |
390 | } | |
391 | ||
392 | static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, | |
393 | pte_t *ptep , pte_t pte) | |
394 | { | |
395 | native_set_pte(ptep, pte); | |
396 | } | |
397 | ||
398 | #ifndef CONFIG_PARAVIRT | |
399 | /* | |
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. | |
411 | */ | |
412 | #define pte_update(mm, addr, ptep) do { } while (0) | |
413 | #define pte_update_defer(mm, addr, ptep) do { } while (0) | |
414 | #endif | |
415 | ||
416 | /* | |
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. | |
422 | */ | |
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); | |
427 | ||
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); | |
431 | ||
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); | |
435 | ||
436 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR | |
437 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, | |
438 | pte_t *ptep) | |
439 | { | |
440 | pte_t pte = native_ptep_get_and_clear(ptep); | |
441 | pte_update(mm, addr, ptep); | |
442 | return pte; | |
443 | } | |
444 | ||
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, | |
448 | int full) | |
449 | { | |
450 | pte_t pte; | |
451 | if (full) { | |
452 | /* | |
453 | * Full address destruction in progress; paravirt does not | |
454 | * care about updates and native needs no locking | |
455 | */ | |
456 | pte = native_local_ptep_get_and_clear(ptep); | |
457 | } else { | |
458 | pte = ptep_get_and_clear(mm, addr, ptep); | |
459 | } | |
460 | return pte; | |
461 | } | |
462 | ||
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) | |
466 | { | |
467 | clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); | |
468 | pte_update(mm, addr, ptep); | |
469 | } | |
470 | ||
471 | /* | |
472 | * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); | |
473 | * | |
474 | * dst - pointer to pgd range anwhere on a pgd page | |
475 | * src - "" | |
476 | * count - the number of pgds to copy. | |
477 | * | |
478 | * dst and src can be on the same page, but the range must not overlap, | |
479 | * and must not cross a page boundary. | |
480 | */ | |
481 | static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) | |
482 | { | |
483 | memcpy(dst, src, count * sizeof(pgd_t)); | |
484 | } | |
485 | ||
486 | ||
487 | #include <asm-generic/pgtable.h> | |
488 | #endif /* __ASSEMBLY__ */ | |
489 | ||
490 | #endif /* _ASM_X86_PGTABLE_H */ |