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1da177e4 LT |
1 | #ifndef _ASM_GENERIC_PGTABLE_H |
2 | #define _ASM_GENERIC_PGTABLE_H | |
3 | ||
673eae82 | 4 | #ifndef __ASSEMBLY__ |
9535239f | 5 | #ifdef CONFIG_MMU |
673eae82 | 6 | |
1da177e4 | 7 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
e2cda322 AA |
8 | extern int ptep_set_access_flags(struct vm_area_struct *vma, |
9 | unsigned long address, pte_t *ptep, | |
10 | pte_t entry, int dirty); | |
11 | #endif | |
12 | ||
13 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
14 | extern int pmdp_set_access_flags(struct vm_area_struct *vma, | |
15 | unsigned long address, pmd_t *pmdp, | |
16 | pmd_t entry, int dirty); | |
1da177e4 LT |
17 | #endif |
18 | ||
19 | #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
e2cda322 AA |
20 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
21 | unsigned long address, | |
22 | pte_t *ptep) | |
23 | { | |
24 | pte_t pte = *ptep; | |
25 | int r = 1; | |
26 | if (!pte_young(pte)) | |
27 | r = 0; | |
28 | else | |
29 | set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte)); | |
30 | return r; | |
31 | } | |
32 | #endif | |
33 | ||
34 | #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG | |
35 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
36 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
37 | unsigned long address, | |
38 | pmd_t *pmdp) | |
39 | { | |
40 | pmd_t pmd = *pmdp; | |
41 | int r = 1; | |
42 | if (!pmd_young(pmd)) | |
43 | r = 0; | |
44 | else | |
45 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd)); | |
46 | return r; | |
47 | } | |
48 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
49 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
50 | unsigned long address, | |
51 | pmd_t *pmdp) | |
52 | { | |
53 | BUG(); | |
54 | return 0; | |
55 | } | |
56 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
57 | #endif |
58 | ||
59 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
e2cda322 AA |
60 | int ptep_clear_flush_young(struct vm_area_struct *vma, |
61 | unsigned long address, pte_t *ptep); | |
62 | #endif | |
63 | ||
64 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
65 | int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
66 | unsigned long address, pmd_t *pmdp); | |
1da177e4 LT |
67 | #endif |
68 | ||
1da177e4 | 69 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR |
e2cda322 AA |
70 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
71 | unsigned long address, | |
72 | pte_t *ptep) | |
73 | { | |
74 | pte_t pte = *ptep; | |
75 | pte_clear(mm, address, ptep); | |
76 | return pte; | |
77 | } | |
78 | #endif | |
79 | ||
80 | #ifndef __HAVE_ARCH_PMDP_GET_AND_CLEAR | |
81 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
82 | static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, | |
83 | unsigned long address, | |
84 | pmd_t *pmdp) | |
85 | { | |
86 | pmd_t pmd = *pmdp; | |
87 | pmd_clear(mm, address, pmdp); | |
88 | return pmd; | |
1da177e4 | 89 | }) |
e2cda322 | 90 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1da177e4 LT |
91 | #endif |
92 | ||
a600388d | 93 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
e2cda322 AA |
94 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
95 | unsigned long address, pte_t *ptep, | |
96 | int full) | |
97 | { | |
98 | pte_t pte; | |
99 | pte = ptep_get_and_clear(mm, address, ptep); | |
100 | return pte; | |
101 | } | |
a600388d ZA |
102 | #endif |
103 | ||
9888a1ca ZA |
104 | /* |
105 | * Some architectures may be able to avoid expensive synchronization | |
106 | * primitives when modifications are made to PTE's which are already | |
107 | * not present, or in the process of an address space destruction. | |
108 | */ | |
109 | #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL | |
e2cda322 AA |
110 | static inline void pte_clear_not_present_full(struct mm_struct *mm, |
111 | unsigned long address, | |
112 | pte_t *ptep, | |
113 | int full) | |
114 | { | |
115 | pte_clear(mm, address, ptep); | |
116 | } | |
a600388d ZA |
117 | #endif |
118 | ||
1da177e4 | 119 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH |
e2cda322 AA |
120 | extern pte_t ptep_clear_flush(struct vm_area_struct *vma, |
121 | unsigned long address, | |
122 | pte_t *ptep); | |
123 | #endif | |
124 | ||
125 | #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH | |
126 | extern pmd_t pmdp_clear_flush(struct vm_area_struct *vma, | |
127 | unsigned long address, | |
128 | pmd_t *pmdp); | |
1da177e4 LT |
129 | #endif |
130 | ||
131 | #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT | |
8c65b4a6 | 132 | struct mm_struct; |
1da177e4 LT |
133 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) |
134 | { | |
135 | pte_t old_pte = *ptep; | |
136 | set_pte_at(mm, address, ptep, pte_wrprotect(old_pte)); | |
137 | } | |
138 | #endif | |
139 | ||
e2cda322 AA |
140 | #ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT |
141 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
142 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, | |
143 | unsigned long address, pmd_t *pmdp) | |
144 | { | |
145 | pmd_t old_pmd = *pmdp; | |
146 | set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd)); | |
147 | } | |
148 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
149 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, | |
150 | unsigned long address, pmd_t *pmdp) | |
151 | { | |
152 | BUG(); | |
153 | } | |
154 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
155 | #endif | |
156 | ||
157 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH | |
b3697c02 AA |
158 | extern pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, |
159 | unsigned long address, | |
160 | pmd_t *pmdp); | |
e2cda322 AA |
161 | #endif |
162 | ||
1da177e4 | 163 | #ifndef __HAVE_ARCH_PTE_SAME |
e2cda322 AA |
164 | static inline int pte_same(pte_t pte_a, pte_t pte_b) |
165 | { | |
166 | return pte_val(pte_a) == pte_val(pte_b); | |
167 | } | |
168 | #endif | |
169 | ||
170 | #ifndef __HAVE_ARCH_PMD_SAME | |
171 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
172 | static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
173 | { | |
174 | return pmd_val(pmd_a) == pmd_val(pmd_b); | |
175 | } | |
176 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
177 | static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
178 | { | |
179 | BUG(); | |
180 | return 0; | |
181 | } | |
182 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
183 | #endif |
184 | ||
6c210482 MS |
185 | #ifndef __HAVE_ARCH_PAGE_TEST_DIRTY |
186 | #define page_test_dirty(page) (0) | |
187 | #endif | |
188 | ||
189 | #ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY | |
e2b8d7af | 190 | #define page_clear_dirty(page, mapped) do { } while (0) |
6c210482 MS |
191 | #endif |
192 | ||
193 | #ifndef __HAVE_ARCH_PAGE_TEST_DIRTY | |
b4955ce3 AK |
194 | #define pte_maybe_dirty(pte) pte_dirty(pte) |
195 | #else | |
196 | #define pte_maybe_dirty(pte) (1) | |
1da177e4 LT |
197 | #endif |
198 | ||
199 | #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG | |
200 | #define page_test_and_clear_young(page) (0) | |
201 | #endif | |
202 | ||
203 | #ifndef __HAVE_ARCH_PGD_OFFSET_GATE | |
204 | #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) | |
205 | #endif | |
206 | ||
0b0968a3 | 207 | #ifndef __HAVE_ARCH_MOVE_PTE |
8b1f3124 | 208 | #define move_pte(pte, prot, old_addr, new_addr) (pte) |
8b1f3124 NP |
209 | #endif |
210 | ||
61c77326 SL |
211 | #ifndef flush_tlb_fix_spurious_fault |
212 | #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) | |
213 | #endif | |
214 | ||
0634a632 PM |
215 | #ifndef pgprot_noncached |
216 | #define pgprot_noncached(prot) (prot) | |
217 | #endif | |
218 | ||
2520bd31 | 219 | #ifndef pgprot_writecombine |
220 | #define pgprot_writecombine pgprot_noncached | |
221 | #endif | |
222 | ||
1da177e4 | 223 | /* |
8f6c99c1 HD |
224 | * When walking page tables, get the address of the next boundary, |
225 | * or the end address of the range if that comes earlier. Although no | |
226 | * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout. | |
1da177e4 LT |
227 | */ |
228 | ||
1da177e4 LT |
229 | #define pgd_addr_end(addr, end) \ |
230 | ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ | |
231 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
232 | }) | |
1da177e4 LT |
233 | |
234 | #ifndef pud_addr_end | |
235 | #define pud_addr_end(addr, end) \ | |
236 | ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ | |
237 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
238 | }) | |
239 | #endif | |
240 | ||
241 | #ifndef pmd_addr_end | |
242 | #define pmd_addr_end(addr, end) \ | |
243 | ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ | |
244 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
245 | }) | |
246 | #endif | |
247 | ||
1da177e4 LT |
248 | /* |
249 | * When walking page tables, we usually want to skip any p?d_none entries; | |
250 | * and any p?d_bad entries - reporting the error before resetting to none. | |
251 | * Do the tests inline, but report and clear the bad entry in mm/memory.c. | |
252 | */ | |
253 | void pgd_clear_bad(pgd_t *); | |
254 | void pud_clear_bad(pud_t *); | |
255 | void pmd_clear_bad(pmd_t *); | |
256 | ||
257 | static inline int pgd_none_or_clear_bad(pgd_t *pgd) | |
258 | { | |
259 | if (pgd_none(*pgd)) | |
260 | return 1; | |
261 | if (unlikely(pgd_bad(*pgd))) { | |
262 | pgd_clear_bad(pgd); | |
263 | return 1; | |
264 | } | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static inline int pud_none_or_clear_bad(pud_t *pud) | |
269 | { | |
270 | if (pud_none(*pud)) | |
271 | return 1; | |
272 | if (unlikely(pud_bad(*pud))) { | |
273 | pud_clear_bad(pud); | |
274 | return 1; | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static inline int pmd_none_or_clear_bad(pmd_t *pmd) | |
280 | { | |
281 | if (pmd_none(*pmd)) | |
282 | return 1; | |
283 | if (unlikely(pmd_bad(*pmd))) { | |
284 | pmd_clear_bad(pmd); | |
285 | return 1; | |
286 | } | |
287 | return 0; | |
288 | } | |
9535239f | 289 | |
1ea0704e JF |
290 | static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm, |
291 | unsigned long addr, | |
292 | pte_t *ptep) | |
293 | { | |
294 | /* | |
295 | * Get the current pte state, but zero it out to make it | |
296 | * non-present, preventing the hardware from asynchronously | |
297 | * updating it. | |
298 | */ | |
299 | return ptep_get_and_clear(mm, addr, ptep); | |
300 | } | |
301 | ||
302 | static inline void __ptep_modify_prot_commit(struct mm_struct *mm, | |
303 | unsigned long addr, | |
304 | pte_t *ptep, pte_t pte) | |
305 | { | |
306 | /* | |
307 | * The pte is non-present, so there's no hardware state to | |
308 | * preserve. | |
309 | */ | |
310 | set_pte_at(mm, addr, ptep, pte); | |
311 | } | |
312 | ||
313 | #ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION | |
314 | /* | |
315 | * Start a pte protection read-modify-write transaction, which | |
316 | * protects against asynchronous hardware modifications to the pte. | |
317 | * The intention is not to prevent the hardware from making pte | |
318 | * updates, but to prevent any updates it may make from being lost. | |
319 | * | |
320 | * This does not protect against other software modifications of the | |
321 | * pte; the appropriate pte lock must be held over the transation. | |
322 | * | |
323 | * Note that this interface is intended to be batchable, meaning that | |
324 | * ptep_modify_prot_commit may not actually update the pte, but merely | |
325 | * queue the update to be done at some later time. The update must be | |
326 | * actually committed before the pte lock is released, however. | |
327 | */ | |
328 | static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, | |
329 | unsigned long addr, | |
330 | pte_t *ptep) | |
331 | { | |
332 | return __ptep_modify_prot_start(mm, addr, ptep); | |
333 | } | |
334 | ||
335 | /* | |
336 | * Commit an update to a pte, leaving any hardware-controlled bits in | |
337 | * the PTE unmodified. | |
338 | */ | |
339 | static inline void ptep_modify_prot_commit(struct mm_struct *mm, | |
340 | unsigned long addr, | |
341 | pte_t *ptep, pte_t pte) | |
342 | { | |
343 | __ptep_modify_prot_commit(mm, addr, ptep, pte); | |
344 | } | |
345 | #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ | |
fe1a6875 | 346 | #endif /* CONFIG_MMU */ |
1ea0704e | 347 | |
9535239f GU |
348 | /* |
349 | * A facility to provide lazy MMU batching. This allows PTE updates and | |
350 | * page invalidations to be delayed until a call to leave lazy MMU mode | |
351 | * is issued. Some architectures may benefit from doing this, and it is | |
352 | * beneficial for both shadow and direct mode hypervisors, which may batch | |
353 | * the PTE updates which happen during this window. Note that using this | |
354 | * interface requires that read hazards be removed from the code. A read | |
355 | * hazard could result in the direct mode hypervisor case, since the actual | |
356 | * write to the page tables may not yet have taken place, so reads though | |
357 | * a raw PTE pointer after it has been modified are not guaranteed to be | |
358 | * up to date. This mode can only be entered and left under the protection of | |
359 | * the page table locks for all page tables which may be modified. In the UP | |
360 | * case, this is required so that preemption is disabled, and in the SMP case, | |
361 | * it must synchronize the delayed page table writes properly on other CPUs. | |
362 | */ | |
363 | #ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE | |
364 | #define arch_enter_lazy_mmu_mode() do {} while (0) | |
365 | #define arch_leave_lazy_mmu_mode() do {} while (0) | |
366 | #define arch_flush_lazy_mmu_mode() do {} while (0) | |
367 | #endif | |
368 | ||
369 | /* | |
7fd7d83d JF |
370 | * A facility to provide batching of the reload of page tables and |
371 | * other process state with the actual context switch code for | |
372 | * paravirtualized guests. By convention, only one of the batched | |
373 | * update (lazy) modes (CPU, MMU) should be active at any given time, | |
374 | * entry should never be nested, and entry and exits should always be | |
375 | * paired. This is for sanity of maintaining and reasoning about the | |
376 | * kernel code. In this case, the exit (end of the context switch) is | |
377 | * in architecture-specific code, and so doesn't need a generic | |
378 | * definition. | |
9535239f | 379 | */ |
7fd7d83d | 380 | #ifndef __HAVE_ARCH_START_CONTEXT_SWITCH |
224101ed | 381 | #define arch_start_context_switch(prev) do {} while (0) |
9535239f GU |
382 | #endif |
383 | ||
34801ba9 | 384 | #ifndef __HAVE_PFNMAP_TRACKING |
385 | /* | |
386 | * Interface that can be used by architecture code to keep track of | |
387 | * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) | |
388 | * | |
389 | * track_pfn_vma_new is called when a _new_ pfn mapping is being established | |
390 | * for physical range indicated by pfn and size. | |
391 | */ | |
e4b866ed | 392 | static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, |
34801ba9 | 393 | unsigned long pfn, unsigned long size) |
394 | { | |
395 | return 0; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Interface that can be used by architecture code to keep track of | |
400 | * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) | |
401 | * | |
402 | * track_pfn_vma_copy is called when vma that is covering the pfnmap gets | |
403 | * copied through copy_page_range(). | |
404 | */ | |
405 | static inline int track_pfn_vma_copy(struct vm_area_struct *vma) | |
406 | { | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Interface that can be used by architecture code to keep track of | |
412 | * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) | |
413 | * | |
414 | * untrack_pfn_vma is called while unmapping a pfnmap for a region. | |
415 | * untrack can be called for a specific region indicated by pfn and size or | |
416 | * can be for the entire vma (in which case size can be zero). | |
417 | */ | |
418 | static inline void untrack_pfn_vma(struct vm_area_struct *vma, | |
419 | unsigned long pfn, unsigned long size) | |
420 | { | |
421 | } | |
422 | #else | |
e4b866ed | 423 | extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, |
34801ba9 | 424 | unsigned long pfn, unsigned long size); |
425 | extern int track_pfn_vma_copy(struct vm_area_struct *vma); | |
426 | extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn, | |
427 | unsigned long size); | |
428 | #endif | |
429 | ||
5f6e8da7 AA |
430 | #ifndef CONFIG_TRANSPARENT_HUGEPAGE |
431 | static inline int pmd_trans_huge(pmd_t pmd) | |
432 | { | |
433 | return 0; | |
434 | } | |
435 | static inline int pmd_trans_splitting(pmd_t pmd) | |
436 | { | |
437 | return 0; | |
438 | } | |
e2cda322 AA |
439 | #ifndef __HAVE_ARCH_PMD_WRITE |
440 | static inline int pmd_write(pmd_t pmd) | |
441 | { | |
442 | BUG(); | |
443 | return 0; | |
444 | } | |
445 | #endif /* __HAVE_ARCH_PMD_WRITE */ | |
5f6e8da7 AA |
446 | #endif |
447 | ||
1da177e4 LT |
448 | #endif /* !__ASSEMBLY__ */ |
449 | ||
450 | #endif /* _ASM_GENERIC_PGTABLE_H */ |