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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 LT |
7 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
8 | /* | |
9 | * Largely same as above, but only sets the access flags (dirty, | |
10 | * accessed, and writable). Furthermore, we know it always gets set | |
11 | * to a "more permissive" setting, which allows most architectures | |
8dab5241 BH |
12 | * to optimize this. We return whether the PTE actually changed, which |
13 | * in turn instructs the caller to do things like update__mmu_cache. | |
14 | * This used to be done in the caller, but sparc needs minor faults to | |
15 | * force that call on sun4c so we changed this macro slightly | |
1da177e4 LT |
16 | */ |
17 | #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ | |
8dab5241 BH |
18 | ({ \ |
19 | int __changed = !pte_same(*(__ptep), __entry); \ | |
20 | if (__changed) { \ | |
21 | set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ | |
22 | flush_tlb_page(__vma, __address); \ | |
23 | } \ | |
24 | __changed; \ | |
25 | }) | |
1da177e4 LT |
26 | #endif |
27 | ||
28 | #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
29 | #define ptep_test_and_clear_young(__vma, __address, __ptep) \ | |
30 | ({ \ | |
31 | pte_t __pte = *(__ptep); \ | |
32 | int r = 1; \ | |
33 | if (!pte_young(__pte)) \ | |
34 | r = 0; \ | |
35 | else \ | |
36 | set_pte_at((__vma)->vm_mm, (__address), \ | |
37 | (__ptep), pte_mkold(__pte)); \ | |
38 | r; \ | |
39 | }) | |
40 | #endif | |
41 | ||
42 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
43 | #define ptep_clear_flush_young(__vma, __address, __ptep) \ | |
44 | ({ \ | |
45 | int __young; \ | |
46 | __young = ptep_test_and_clear_young(__vma, __address, __ptep); \ | |
47 | if (__young) \ | |
48 | flush_tlb_page(__vma, __address); \ | |
49 | __young; \ | |
50 | }) | |
51 | #endif | |
52 | ||
1da177e4 LT |
53 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR |
54 | #define ptep_get_and_clear(__mm, __address, __ptep) \ | |
55 | ({ \ | |
56 | pte_t __pte = *(__ptep); \ | |
57 | pte_clear((__mm), (__address), (__ptep)); \ | |
58 | __pte; \ | |
59 | }) | |
60 | #endif | |
61 | ||
a600388d ZA |
62 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
63 | #define ptep_get_and_clear_full(__mm, __address, __ptep, __full) \ | |
64 | ({ \ | |
65 | pte_t __pte; \ | |
66 | __pte = ptep_get_and_clear((__mm), (__address), (__ptep)); \ | |
67 | __pte; \ | |
68 | }) | |
69 | #endif | |
70 | ||
9888a1ca ZA |
71 | /* |
72 | * Some architectures may be able to avoid expensive synchronization | |
73 | * primitives when modifications are made to PTE's which are already | |
74 | * not present, or in the process of an address space destruction. | |
75 | */ | |
76 | #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL | |
77 | #define pte_clear_not_present_full(__mm, __address, __ptep, __full) \ | |
a600388d ZA |
78 | do { \ |
79 | pte_clear((__mm), (__address), (__ptep)); \ | |
80 | } while (0) | |
81 | #endif | |
82 | ||
1da177e4 LT |
83 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH |
84 | #define ptep_clear_flush(__vma, __address, __ptep) \ | |
85 | ({ \ | |
86 | pte_t __pte; \ | |
87 | __pte = ptep_get_and_clear((__vma)->vm_mm, __address, __ptep); \ | |
88 | flush_tlb_page(__vma, __address); \ | |
89 | __pte; \ | |
90 | }) | |
91 | #endif | |
92 | ||
93 | #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT | |
8c65b4a6 | 94 | struct mm_struct; |
1da177e4 LT |
95 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) |
96 | { | |
97 | pte_t old_pte = *ptep; | |
98 | set_pte_at(mm, address, ptep, pte_wrprotect(old_pte)); | |
99 | } | |
100 | #endif | |
101 | ||
102 | #ifndef __HAVE_ARCH_PTE_SAME | |
103 | #define pte_same(A,B) (pte_val(A) == pte_val(B)) | |
104 | #endif | |
105 | ||
6c210482 MS |
106 | #ifndef __HAVE_ARCH_PAGE_TEST_DIRTY |
107 | #define page_test_dirty(page) (0) | |
108 | #endif | |
109 | ||
110 | #ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY | |
111 | #define page_clear_dirty(page) do { } while (0) | |
112 | #endif | |
113 | ||
114 | #ifndef __HAVE_ARCH_PAGE_TEST_DIRTY | |
b4955ce3 AK |
115 | #define pte_maybe_dirty(pte) pte_dirty(pte) |
116 | #else | |
117 | #define pte_maybe_dirty(pte) (1) | |
1da177e4 LT |
118 | #endif |
119 | ||
120 | #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG | |
121 | #define page_test_and_clear_young(page) (0) | |
122 | #endif | |
123 | ||
124 | #ifndef __HAVE_ARCH_PGD_OFFSET_GATE | |
125 | #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) | |
126 | #endif | |
127 | ||
0b0968a3 | 128 | #ifndef __HAVE_ARCH_MOVE_PTE |
8b1f3124 | 129 | #define move_pte(pte, prot, old_addr, new_addr) (pte) |
8b1f3124 NP |
130 | #endif |
131 | ||
2520bd31 | 132 | #ifndef pgprot_writecombine |
133 | #define pgprot_writecombine pgprot_noncached | |
134 | #endif | |
135 | ||
1da177e4 | 136 | /* |
8f6c99c1 HD |
137 | * When walking page tables, get the address of the next boundary, |
138 | * or the end address of the range if that comes earlier. Although no | |
139 | * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout. | |
1da177e4 LT |
140 | */ |
141 | ||
1da177e4 LT |
142 | #define pgd_addr_end(addr, end) \ |
143 | ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ | |
144 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
145 | }) | |
1da177e4 LT |
146 | |
147 | #ifndef pud_addr_end | |
148 | #define pud_addr_end(addr, end) \ | |
149 | ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ | |
150 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
151 | }) | |
152 | #endif | |
153 | ||
154 | #ifndef pmd_addr_end | |
155 | #define pmd_addr_end(addr, end) \ | |
156 | ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ | |
157 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
158 | }) | |
159 | #endif | |
160 | ||
1da177e4 LT |
161 | /* |
162 | * When walking page tables, we usually want to skip any p?d_none entries; | |
163 | * and any p?d_bad entries - reporting the error before resetting to none. | |
164 | * Do the tests inline, but report and clear the bad entry in mm/memory.c. | |
165 | */ | |
166 | void pgd_clear_bad(pgd_t *); | |
167 | void pud_clear_bad(pud_t *); | |
168 | void pmd_clear_bad(pmd_t *); | |
169 | ||
170 | static inline int pgd_none_or_clear_bad(pgd_t *pgd) | |
171 | { | |
172 | if (pgd_none(*pgd)) | |
173 | return 1; | |
174 | if (unlikely(pgd_bad(*pgd))) { | |
175 | pgd_clear_bad(pgd); | |
176 | return 1; | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static inline int pud_none_or_clear_bad(pud_t *pud) | |
182 | { | |
183 | if (pud_none(*pud)) | |
184 | return 1; | |
185 | if (unlikely(pud_bad(*pud))) { | |
186 | pud_clear_bad(pud); | |
187 | return 1; | |
188 | } | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static inline int pmd_none_or_clear_bad(pmd_t *pmd) | |
193 | { | |
194 | if (pmd_none(*pmd)) | |
195 | return 1; | |
196 | if (unlikely(pmd_bad(*pmd))) { | |
197 | pmd_clear_bad(pmd); | |
198 | return 1; | |
199 | } | |
200 | return 0; | |
201 | } | |
9535239f | 202 | |
1ea0704e JF |
203 | static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm, |
204 | unsigned long addr, | |
205 | pte_t *ptep) | |
206 | { | |
207 | /* | |
208 | * Get the current pte state, but zero it out to make it | |
209 | * non-present, preventing the hardware from asynchronously | |
210 | * updating it. | |
211 | */ | |
212 | return ptep_get_and_clear(mm, addr, ptep); | |
213 | } | |
214 | ||
215 | static inline void __ptep_modify_prot_commit(struct mm_struct *mm, | |
216 | unsigned long addr, | |
217 | pte_t *ptep, pte_t pte) | |
218 | { | |
219 | /* | |
220 | * The pte is non-present, so there's no hardware state to | |
221 | * preserve. | |
222 | */ | |
223 | set_pte_at(mm, addr, ptep, pte); | |
224 | } | |
225 | ||
226 | #ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION | |
227 | /* | |
228 | * Start a pte protection read-modify-write transaction, which | |
229 | * protects against asynchronous hardware modifications to the pte. | |
230 | * The intention is not to prevent the hardware from making pte | |
231 | * updates, but to prevent any updates it may make from being lost. | |
232 | * | |
233 | * This does not protect against other software modifications of the | |
234 | * pte; the appropriate pte lock must be held over the transation. | |
235 | * | |
236 | * Note that this interface is intended to be batchable, meaning that | |
237 | * ptep_modify_prot_commit may not actually update the pte, but merely | |
238 | * queue the update to be done at some later time. The update must be | |
239 | * actually committed before the pte lock is released, however. | |
240 | */ | |
241 | static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, | |
242 | unsigned long addr, | |
243 | pte_t *ptep) | |
244 | { | |
245 | return __ptep_modify_prot_start(mm, addr, ptep); | |
246 | } | |
247 | ||
248 | /* | |
249 | * Commit an update to a pte, leaving any hardware-controlled bits in | |
250 | * the PTE unmodified. | |
251 | */ | |
252 | static inline void ptep_modify_prot_commit(struct mm_struct *mm, | |
253 | unsigned long addr, | |
254 | pte_t *ptep, pte_t pte) | |
255 | { | |
256 | __ptep_modify_prot_commit(mm, addr, ptep, pte); | |
257 | } | |
258 | #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ | |
fe1a6875 | 259 | #endif /* CONFIG_MMU */ |
1ea0704e | 260 | |
9535239f GU |
261 | /* |
262 | * A facility to provide lazy MMU batching. This allows PTE updates and | |
263 | * page invalidations to be delayed until a call to leave lazy MMU mode | |
264 | * is issued. Some architectures may benefit from doing this, and it is | |
265 | * beneficial for both shadow and direct mode hypervisors, which may batch | |
266 | * the PTE updates which happen during this window. Note that using this | |
267 | * interface requires that read hazards be removed from the code. A read | |
268 | * hazard could result in the direct mode hypervisor case, since the actual | |
269 | * write to the page tables may not yet have taken place, so reads though | |
270 | * a raw PTE pointer after it has been modified are not guaranteed to be | |
271 | * up to date. This mode can only be entered and left under the protection of | |
272 | * the page table locks for all page tables which may be modified. In the UP | |
273 | * case, this is required so that preemption is disabled, and in the SMP case, | |
274 | * it must synchronize the delayed page table writes properly on other CPUs. | |
275 | */ | |
276 | #ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE | |
277 | #define arch_enter_lazy_mmu_mode() do {} while (0) | |
278 | #define arch_leave_lazy_mmu_mode() do {} while (0) | |
279 | #define arch_flush_lazy_mmu_mode() do {} while (0) | |
280 | #endif | |
281 | ||
282 | /* | |
7fd7d83d JF |
283 | * A facility to provide batching of the reload of page tables and |
284 | * other process state with the actual context switch code for | |
285 | * paravirtualized guests. By convention, only one of the batched | |
286 | * update (lazy) modes (CPU, MMU) should be active at any given time, | |
287 | * entry should never be nested, and entry and exits should always be | |
288 | * paired. This is for sanity of maintaining and reasoning about the | |
289 | * kernel code. In this case, the exit (end of the context switch) is | |
290 | * in architecture-specific code, and so doesn't need a generic | |
291 | * definition. | |
9535239f | 292 | */ |
7fd7d83d | 293 | #ifndef __HAVE_ARCH_START_CONTEXT_SWITCH |
224101ed | 294 | #define arch_start_context_switch(prev) do {} while (0) |
9535239f GU |
295 | #endif |
296 | ||
34801ba9 | 297 | #ifndef __HAVE_PFNMAP_TRACKING |
298 | /* | |
299 | * Interface that can be used by architecture code to keep track of | |
300 | * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) | |
301 | * | |
302 | * track_pfn_vma_new is called when a _new_ pfn mapping is being established | |
303 | * for physical range indicated by pfn and size. | |
304 | */ | |
e4b866ed | 305 | static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, |
34801ba9 | 306 | unsigned long pfn, unsigned long size) |
307 | { | |
308 | return 0; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Interface that can be used by architecture code to keep track of | |
313 | * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) | |
314 | * | |
315 | * track_pfn_vma_copy is called when vma that is covering the pfnmap gets | |
316 | * copied through copy_page_range(). | |
317 | */ | |
318 | static inline int track_pfn_vma_copy(struct vm_area_struct *vma) | |
319 | { | |
320 | return 0; | |
321 | } | |
322 | ||
323 | /* | |
324 | * Interface that can be used by architecture code to keep track of | |
325 | * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) | |
326 | * | |
327 | * untrack_pfn_vma is called while unmapping a pfnmap for a region. | |
328 | * untrack can be called for a specific region indicated by pfn and size or | |
329 | * can be for the entire vma (in which case size can be zero). | |
330 | */ | |
331 | static inline void untrack_pfn_vma(struct vm_area_struct *vma, | |
332 | unsigned long pfn, unsigned long size) | |
333 | { | |
334 | } | |
335 | #else | |
e4b866ed | 336 | extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, |
34801ba9 | 337 | unsigned long pfn, unsigned long size); |
338 | extern int track_pfn_vma_copy(struct vm_area_struct *vma); | |
339 | extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn, | |
340 | unsigned long size); | |
341 | #endif | |
342 | ||
1da177e4 LT |
343 | #endif /* !__ASSEMBLY__ */ |
344 | ||
345 | #endif /* _ASM_GENERIC_PGTABLE_H */ |