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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2003 Ralf Baechle | |
7 | */ | |
8 | #ifndef _ASM_PGTABLE_H | |
9 | #define _ASM_PGTABLE_H | |
10 | ||
875d43e7 | 11 | #ifdef CONFIG_32BIT |
1da177e4 LT |
12 | #include <asm/pgtable-32.h> |
13 | #endif | |
875d43e7 | 14 | #ifdef CONFIG_64BIT |
1da177e4 LT |
15 | #include <asm/pgtable-64.h> |
16 | #endif | |
17 | ||
f10fae02 | 18 | #include <asm/io.h> |
1da177e4 LT |
19 | #include <asm/pgtable-bits.h> |
20 | ||
8c65b4a6 TS |
21 | struct mm_struct; |
22 | struct vm_area_struct; | |
23 | ||
1da177e4 LT |
24 | #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) |
25 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ | |
26 | PAGE_CACHABLE_DEFAULT) | |
27 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ | |
28 | PAGE_CACHABLE_DEFAULT) | |
29 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ | |
30 | PAGE_CACHABLE_DEFAULT) | |
31 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ | |
32 | _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT) | |
33 | #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ | |
34 | PAGE_CACHABLE_DEFAULT) | |
35 | #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ | |
36 | __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) | |
37 | ||
38 | /* | |
39 | * MIPS can't do page protection for execute, and considers that the same like | |
40 | * read. Also, write permissions imply read permissions. This is the closest | |
41 | * we can get by reasonable means.. | |
42 | */ | |
43 | #define __P000 PAGE_NONE | |
44 | #define __P001 PAGE_READONLY | |
45 | #define __P010 PAGE_COPY | |
46 | #define __P011 PAGE_COPY | |
47 | #define __P100 PAGE_READONLY | |
48 | #define __P101 PAGE_READONLY | |
49 | #define __P110 PAGE_COPY | |
50 | #define __P111 PAGE_COPY | |
51 | ||
52 | #define __S000 PAGE_NONE | |
53 | #define __S001 PAGE_READONLY | |
54 | #define __S010 PAGE_SHARED | |
55 | #define __S011 PAGE_SHARED | |
56 | #define __S100 PAGE_READONLY | |
57 | #define __S101 PAGE_READONLY | |
58 | #define __S110 PAGE_SHARED | |
59 | #define __S111 PAGE_SHARED | |
60 | ||
61 | /* | |
62 | * ZERO_PAGE is a global shared page that is always zero; used | |
63 | * for zero-mapped memory areas etc.. | |
64 | */ | |
65 | ||
66 | extern unsigned long empty_zero_page; | |
67 | extern unsigned long zero_page_mask; | |
68 | ||
69 | #define ZERO_PAGE(vaddr) \ | |
99e3b942 | 70 | (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) |
1da177e4 | 71 | |
0b0968a3 DM |
72 | #define __HAVE_ARCH_MOVE_PTE |
73 | #define move_pte(pte, prot, old_addr, new_addr) \ | |
74 | ({ \ | |
75 | pte_t newpte = (pte); \ | |
76 | if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \ | |
77 | pte_page(pte) == ZERO_PAGE(old_addr)) \ | |
78 | newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \ | |
79 | newpte; \ | |
80 | }) | |
8b1f3124 | 81 | |
1da177e4 LT |
82 | extern void paging_init(void); |
83 | ||
84 | /* | |
85 | * Conversion functions: convert a page and protection to a page entry, | |
86 | * and a page entry and page directory to the page they refer to. | |
87 | */ | |
1da177e4 LT |
88 | #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET) |
89 | #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) | |
46a82b2d | 90 | #define pmd_page_vaddr(pmd) pmd_val(pmd) |
1da177e4 | 91 | |
6e760c8d | 92 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) |
6e953891 SS |
93 | |
94 | #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) | |
95 | #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) | |
96 | ||
1da177e4 LT |
97 | static inline void set_pte(pte_t *ptep, pte_t pte) |
98 | { | |
99 | ptep->pte_high = pte.pte_high; | |
100 | smp_wmb(); | |
101 | ptep->pte_low = pte.pte_low; | |
102 | //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); | |
103 | ||
6e953891 | 104 | if (pte.pte_low & _PAGE_GLOBAL) { |
1da177e4 LT |
105 | pte_t *buddy = ptep_buddy(ptep); |
106 | /* | |
107 | * Make sure the buddy is global too (if it's !none, | |
108 | * it better already be global) | |
109 | */ | |
6e953891 SS |
110 | if (pte_none(*buddy)) { |
111 | buddy->pte_low |= _PAGE_GLOBAL; | |
112 | buddy->pte_high |= _PAGE_GLOBAL; | |
113 | } | |
1da177e4 LT |
114 | } |
115 | } | |
116 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
117 | ||
118 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
119 | { | |
6e953891 SS |
120 | pte_t null = __pte(0); |
121 | ||
1da177e4 | 122 | /* Preserve global status for the pair */ |
6e953891 SS |
123 | if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) |
124 | null.pte_low = null.pte_high = _PAGE_GLOBAL; | |
125 | ||
126 | set_pte_at(mm, addr, ptep, null); | |
1da177e4 LT |
127 | } |
128 | #else | |
6e953891 SS |
129 | |
130 | #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) | |
131 | #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) | |
132 | ||
1da177e4 LT |
133 | /* |
134 | * Certain architectures need to do special things when pte's | |
135 | * within a page table are directly modified. Thus, the following | |
136 | * hook is made available. | |
137 | */ | |
138 | static inline void set_pte(pte_t *ptep, pte_t pteval) | |
139 | { | |
140 | *ptep = pteval; | |
141 | #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) | |
142 | if (pte_val(pteval) & _PAGE_GLOBAL) { | |
143 | pte_t *buddy = ptep_buddy(ptep); | |
144 | /* | |
145 | * Make sure the buddy is global too (if it's !none, | |
146 | * it better already be global) | |
147 | */ | |
148 | if (pte_none(*buddy)) | |
149 | pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; | |
150 | } | |
151 | #endif | |
152 | } | |
153 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
154 | ||
155 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
156 | { | |
157 | #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) | |
158 | /* Preserve global status for the pair */ | |
159 | if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) | |
160 | set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); | |
161 | else | |
162 | #endif | |
163 | set_pte_at(mm, addr, ptep, __pte(0)); | |
164 | } | |
165 | #endif | |
166 | ||
167 | /* | |
c6e8b587 | 168 | * (pmds are folded into puds so this doesn't get actually called, |
1da177e4 LT |
169 | * but the define is needed for a generic inline function.) |
170 | */ | |
171 | #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) | |
c6e8b587 RB |
172 | |
173 | #ifdef CONFIG_64BIT | |
174 | /* | |
175 | * (puds are folded into pgds so this doesn't get actually called, | |
176 | * but the define is needed for a generic inline function.) | |
177 | */ | |
178 | #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) | |
179 | #endif | |
1da177e4 LT |
180 | |
181 | #define PGD_T_LOG2 ffz(~sizeof(pgd_t)) | |
182 | #define PMD_T_LOG2 ffz(~sizeof(pmd_t)) | |
183 | #define PTE_T_LOG2 ffz(~sizeof(pte_t)) | |
184 | ||
185 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
186 | ||
187 | /* | |
188 | * The following only work if pte_present() is true. | |
189 | * Undefined behaviour if not.. | |
190 | */ | |
191 | static inline int pte_user(pte_t pte) { BUG(); return 0; } | |
6e760c8d | 192 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) |
6e953891 SS |
193 | static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; } |
194 | static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } | |
195 | static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } | |
196 | static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } | |
197 | static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } | |
198 | ||
1da177e4 LT |
199 | static inline pte_t pte_wrprotect(pte_t pte) |
200 | { | |
6e953891 SS |
201 | pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); |
202 | pte.pte_high &= ~_PAGE_SILENT_WRITE; | |
1da177e4 LT |
203 | return pte; |
204 | } | |
205 | ||
206 | static inline pte_t pte_rdprotect(pte_t pte) | |
207 | { | |
6e953891 SS |
208 | pte.pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ); |
209 | pte.pte_high &= ~_PAGE_SILENT_READ; | |
1da177e4 LT |
210 | return pte; |
211 | } | |
212 | ||
213 | static inline pte_t pte_mkclean(pte_t pte) | |
214 | { | |
6e953891 SS |
215 | pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); |
216 | pte.pte_high &= ~_PAGE_SILENT_WRITE; | |
1da177e4 LT |
217 | return pte; |
218 | } | |
219 | ||
220 | static inline pte_t pte_mkold(pte_t pte) | |
221 | { | |
6e953891 SS |
222 | pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); |
223 | pte.pte_high &= ~_PAGE_SILENT_READ; | |
1da177e4 LT |
224 | return pte; |
225 | } | |
226 | ||
227 | static inline pte_t pte_mkwrite(pte_t pte) | |
228 | { | |
6e953891 SS |
229 | pte.pte_low |= _PAGE_WRITE; |
230 | if (pte.pte_low & _PAGE_MODIFIED) { | |
231 | pte.pte_low |= _PAGE_SILENT_WRITE; | |
232 | pte.pte_high |= _PAGE_SILENT_WRITE; | |
1da177e4 LT |
233 | } |
234 | return pte; | |
235 | } | |
236 | ||
237 | static inline pte_t pte_mkread(pte_t pte) | |
238 | { | |
6e953891 SS |
239 | pte.pte_low |= _PAGE_READ; |
240 | if (pte.pte_low & _PAGE_ACCESSED) { | |
241 | pte.pte_low |= _PAGE_SILENT_READ; | |
242 | pte.pte_high |= _PAGE_SILENT_READ; | |
1da177e4 LT |
243 | } |
244 | return pte; | |
245 | } | |
246 | ||
247 | static inline pte_t pte_mkdirty(pte_t pte) | |
248 | { | |
6e953891 SS |
249 | pte.pte_low |= _PAGE_MODIFIED; |
250 | if (pte.pte_low & _PAGE_WRITE) { | |
251 | pte.pte_low |= _PAGE_SILENT_WRITE; | |
252 | pte.pte_high |= _PAGE_SILENT_WRITE; | |
1da177e4 LT |
253 | } |
254 | return pte; | |
255 | } | |
256 | ||
257 | static inline pte_t pte_mkyoung(pte_t pte) | |
258 | { | |
6e953891 SS |
259 | pte.pte_low |= _PAGE_ACCESSED; |
260 | if (pte.pte_low & _PAGE_READ) | |
261 | pte.pte_low |= _PAGE_SILENT_READ; | |
262 | pte.pte_high |= _PAGE_SILENT_READ; | |
1da177e4 LT |
263 | return pte; |
264 | } | |
265 | #else | |
266 | static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; } | |
267 | static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } | |
268 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } | |
269 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } | |
270 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } | |
271 | ||
272 | static inline pte_t pte_wrprotect(pte_t pte) | |
273 | { | |
274 | pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); | |
275 | return pte; | |
276 | } | |
277 | ||
278 | static inline pte_t pte_rdprotect(pte_t pte) | |
279 | { | |
280 | pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ); | |
281 | return pte; | |
282 | } | |
283 | ||
284 | static inline pte_t pte_mkclean(pte_t pte) | |
285 | { | |
286 | pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); | |
287 | return pte; | |
288 | } | |
289 | ||
290 | static inline pte_t pte_mkold(pte_t pte) | |
291 | { | |
292 | pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); | |
293 | return pte; | |
294 | } | |
295 | ||
296 | static inline pte_t pte_mkwrite(pte_t pte) | |
297 | { | |
298 | pte_val(pte) |= _PAGE_WRITE; | |
299 | if (pte_val(pte) & _PAGE_MODIFIED) | |
300 | pte_val(pte) |= _PAGE_SILENT_WRITE; | |
301 | return pte; | |
302 | } | |
303 | ||
304 | static inline pte_t pte_mkread(pte_t pte) | |
305 | { | |
306 | pte_val(pte) |= _PAGE_READ; | |
307 | if (pte_val(pte) & _PAGE_ACCESSED) | |
308 | pte_val(pte) |= _PAGE_SILENT_READ; | |
309 | return pte; | |
310 | } | |
311 | ||
312 | static inline pte_t pte_mkdirty(pte_t pte) | |
313 | { | |
314 | pte_val(pte) |= _PAGE_MODIFIED; | |
315 | if (pte_val(pte) & _PAGE_WRITE) | |
316 | pte_val(pte) |= _PAGE_SILENT_WRITE; | |
317 | return pte; | |
318 | } | |
319 | ||
320 | static inline pte_t pte_mkyoung(pte_t pte) | |
321 | { | |
322 | pte_val(pte) |= _PAGE_ACCESSED; | |
323 | if (pte_val(pte) & _PAGE_READ) | |
324 | pte_val(pte) |= _PAGE_SILENT_READ; | |
325 | return pte; | |
326 | } | |
327 | #endif | |
328 | ||
329 | /* | |
330 | * Macro to make mark a page protection value as "uncacheable". Note | |
331 | * that "protection" is really a misnomer here as the protection value | |
332 | * contains the memory attribute bits, dirty bits, and various other | |
333 | * bits as well. | |
334 | */ | |
335 | #define pgprot_noncached pgprot_noncached | |
336 | ||
337 | static inline pgprot_t pgprot_noncached(pgprot_t _prot) | |
338 | { | |
339 | unsigned long prot = pgprot_val(_prot); | |
340 | ||
341 | prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; | |
342 | ||
343 | return __pgprot(prot); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Conversion functions: convert a page and protection to a page entry, | |
348 | * and a page entry and page directory to the page they refer to. | |
349 | */ | |
350 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
351 | ||
6e760c8d | 352 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) |
1da177e4 LT |
353 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
354 | { | |
79e0bc37 SS |
355 | pte.pte_low &= _PAGE_CHG_MASK; |
356 | pte.pte_high &= ~0x3f; | |
357 | pte.pte_low |= pgprot_val(newprot); | |
1da177e4 LT |
358 | pte.pte_high |= pgprot_val(newprot) & 0x3f; |
359 | return pte; | |
360 | } | |
361 | #else | |
362 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
363 | { | |
364 | return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); | |
365 | } | |
366 | #endif | |
367 | ||
368 | ||
369 | extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, | |
370 | pte_t pte); | |
371 | extern void __update_cache(struct vm_area_struct *vma, unsigned long address, | |
372 | pte_t pte); | |
373 | ||
374 | static inline void update_mmu_cache(struct vm_area_struct *vma, | |
375 | unsigned long address, pte_t pte) | |
376 | { | |
377 | __update_tlb(vma, address, pte); | |
378 | __update_cache(vma, address, pte); | |
379 | } | |
380 | ||
1da177e4 | 381 | #define kern_addr_valid(addr) (1) |
1da177e4 LT |
382 | |
383 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
1da177e4 LT |
384 | extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); |
385 | ||
1da177e4 LT |
386 | static inline int io_remap_pfn_range(struct vm_area_struct *vma, |
387 | unsigned long vaddr, | |
388 | unsigned long pfn, | |
389 | unsigned long size, | |
390 | pgprot_t prot) | |
391 | { | |
392 | phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); | |
ac5d8c02 | 393 | return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); |
1da177e4 LT |
394 | } |
395 | #else | |
1da177e4 LT |
396 | #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ |
397 | remap_pfn_range(vma, vaddr, pfn, size, prot) | |
398 | #endif | |
399 | ||
400 | #define MK_IOSPACE_PFN(space, pfn) (pfn) | |
401 | #define GET_IOSPACE(pfn) 0 | |
402 | #define GET_PFN(pfn) (pfn) | |
403 | ||
404 | #include <asm-generic/pgtable.h> | |
405 | ||
406 | /* | |
407 | * We provide our own get_unmapped area to cope with the virtual aliasing | |
408 | * constraints placed on us by the cache architecture. | |
409 | */ | |
410 | #define HAVE_ARCH_UNMAPPED_AREA | |
411 | ||
412 | /* | |
413 | * No page table caches to initialise | |
414 | */ | |
415 | #define pgtable_cache_init() do { } while (0) | |
416 | ||
417 | #endif /* _ASM_PGTABLE_H */ |