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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 | \ | |
35133692 | 26 | _page_cachable_default) |
1da177e4 | 27 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ |
35133692 | 28 | _page_cachable_default) |
1da177e4 | 29 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ |
35133692 | 30 | _page_cachable_default) |
1da177e4 | 31 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ |
35133692 | 32 | _PAGE_GLOBAL | _page_cachable_default) |
1da177e4 | 33 | #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ |
35133692 | 34 | _page_cachable_default) |
1da177e4 LT |
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 | */ | |
1da177e4 | 43 | |
35133692 CD |
44 | /* |
45 | * Dummy values to fill the table in mmap.c | |
46 | * The real values will be generated at runtime | |
47 | */ | |
48 | #define __P000 __pgprot(0) | |
49 | #define __P001 __pgprot(0) | |
50 | #define __P010 __pgprot(0) | |
51 | #define __P011 __pgprot(0) | |
52 | #define __P100 __pgprot(0) | |
53 | #define __P101 __pgprot(0) | |
54 | #define __P110 __pgprot(0) | |
55 | #define __P111 __pgprot(0) | |
56 | ||
57 | #define __S000 __pgprot(0) | |
58 | #define __S001 __pgprot(0) | |
59 | #define __S010 __pgprot(0) | |
60 | #define __S011 __pgprot(0) | |
61 | #define __S100 __pgprot(0) | |
62 | #define __S101 __pgprot(0) | |
63 | #define __S110 __pgprot(0) | |
64 | #define __S111 __pgprot(0) | |
65 | ||
66 | extern unsigned long _page_cachable_default; | |
1da177e4 LT |
67 | |
68 | /* | |
69 | * ZERO_PAGE is a global shared page that is always zero; used | |
70 | * for zero-mapped memory areas etc.. | |
71 | */ | |
72 | ||
73 | extern unsigned long empty_zero_page; | |
74 | extern unsigned long zero_page_mask; | |
75 | ||
76 | #define ZERO_PAGE(vaddr) \ | |
99e3b942 | 77 | (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) |
1da177e4 LT |
78 | |
79 | extern void paging_init(void); | |
80 | ||
81 | /* | |
82 | * Conversion functions: convert a page and protection to a page entry, | |
83 | * and a page entry and page directory to the page they refer to. | |
84 | */ | |
c9d06962 | 85 | #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) |
1da177e4 | 86 | #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) |
46a82b2d | 87 | #define pmd_page_vaddr(pmd) pmd_val(pmd) |
1da177e4 | 88 | |
962f480e | 89 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) |
6e953891 SS |
90 | |
91 | #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) | |
92 | #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) | |
93 | ||
1da177e4 LT |
94 | static inline void set_pte(pte_t *ptep, pte_t pte) |
95 | { | |
96 | ptep->pte_high = pte.pte_high; | |
97 | smp_wmb(); | |
98 | ptep->pte_low = pte.pte_low; | |
99 | //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); | |
100 | ||
6e953891 | 101 | if (pte.pte_low & _PAGE_GLOBAL) { |
1da177e4 LT |
102 | pte_t *buddy = ptep_buddy(ptep); |
103 | /* | |
104 | * Make sure the buddy is global too (if it's !none, | |
105 | * it better already be global) | |
106 | */ | |
6e953891 SS |
107 | if (pte_none(*buddy)) { |
108 | buddy->pte_low |= _PAGE_GLOBAL; | |
109 | buddy->pte_high |= _PAGE_GLOBAL; | |
110 | } | |
1da177e4 LT |
111 | } |
112 | } | |
21a151d8 | 113 | #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) |
1da177e4 LT |
114 | |
115 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
116 | { | |
6e953891 SS |
117 | pte_t null = __pte(0); |
118 | ||
1da177e4 | 119 | /* Preserve global status for the pair */ |
6e953891 SS |
120 | if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) |
121 | null.pte_low = null.pte_high = _PAGE_GLOBAL; | |
122 | ||
123 | set_pte_at(mm, addr, ptep, null); | |
1da177e4 LT |
124 | } |
125 | #else | |
6e953891 SS |
126 | |
127 | #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) | |
128 | #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * Certain architectures need to do special things when pte's | |
132 | * within a page table are directly modified. Thus, the following | |
133 | * hook is made available. | |
134 | */ | |
135 | static inline void set_pte(pte_t *ptep, pte_t pteval) | |
136 | { | |
137 | *ptep = pteval; | |
138 | #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) | |
139 | if (pte_val(pteval) & _PAGE_GLOBAL) { | |
140 | pte_t *buddy = ptep_buddy(ptep); | |
141 | /* | |
142 | * Make sure the buddy is global too (if it's !none, | |
143 | * it better already be global) | |
144 | */ | |
145 | if (pte_none(*buddy)) | |
146 | pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; | |
147 | } | |
148 | #endif | |
149 | } | |
21a151d8 | 150 | #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) |
1da177e4 LT |
151 | |
152 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
153 | { | |
154 | #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) | |
155 | /* Preserve global status for the pair */ | |
156 | if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) | |
157 | set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); | |
158 | else | |
159 | #endif | |
160 | set_pte_at(mm, addr, ptep, __pte(0)); | |
161 | } | |
162 | #endif | |
163 | ||
164 | /* | |
c6e8b587 | 165 | * (pmds are folded into puds so this doesn't get actually called, |
1da177e4 LT |
166 | * but the define is needed for a generic inline function.) |
167 | */ | |
168 | #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) | |
c6e8b587 RB |
169 | |
170 | #ifdef CONFIG_64BIT | |
171 | /* | |
172 | * (puds are folded into pgds so this doesn't get actually called, | |
173 | * but the define is needed for a generic inline function.) | |
174 | */ | |
175 | #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) | |
176 | #endif | |
1da177e4 | 177 | |
5ff97472 RB |
178 | #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) |
179 | #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) | |
180 | #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) | |
1da177e4 | 181 | |
9975e77d RB |
182 | /* |
183 | * We used to declare this array with size but gcc 3.3 and older are not able | |
184 | * to find that this expression is a constant, so the size is dropped. | |
185 | */ | |
186 | extern pgd_t swapper_pg_dir[]; | |
1da177e4 LT |
187 | |
188 | /* | |
189 | * The following only work if pte_present() is true. | |
190 | * Undefined behaviour if not.. | |
191 | */ | |
962f480e | 192 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) |
6e953891 SS |
193 | static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } |
194 | static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } | |
195 | static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } | |
196 | static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } | |
197 | ||
1da177e4 LT |
198 | static inline pte_t pte_wrprotect(pte_t pte) |
199 | { | |
6e953891 SS |
200 | pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); |
201 | pte.pte_high &= ~_PAGE_SILENT_WRITE; | |
1da177e4 LT |
202 | return pte; |
203 | } | |
204 | ||
1da177e4 LT |
205 | static inline pte_t pte_mkclean(pte_t pte) |
206 | { | |
6e953891 SS |
207 | pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); |
208 | pte.pte_high &= ~_PAGE_SILENT_WRITE; | |
1da177e4 LT |
209 | return pte; |
210 | } | |
211 | ||
212 | static inline pte_t pte_mkold(pte_t pte) | |
213 | { | |
6e953891 SS |
214 | pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); |
215 | pte.pte_high &= ~_PAGE_SILENT_READ; | |
1da177e4 LT |
216 | return pte; |
217 | } | |
218 | ||
219 | static inline pte_t pte_mkwrite(pte_t pte) | |
220 | { | |
6e953891 SS |
221 | pte.pte_low |= _PAGE_WRITE; |
222 | if (pte.pte_low & _PAGE_MODIFIED) { | |
223 | pte.pte_low |= _PAGE_SILENT_WRITE; | |
224 | pte.pte_high |= _PAGE_SILENT_WRITE; | |
1da177e4 LT |
225 | } |
226 | return pte; | |
227 | } | |
228 | ||
1da177e4 LT |
229 | static inline pte_t pte_mkdirty(pte_t pte) |
230 | { | |
6e953891 SS |
231 | pte.pte_low |= _PAGE_MODIFIED; |
232 | if (pte.pte_low & _PAGE_WRITE) { | |
233 | pte.pte_low |= _PAGE_SILENT_WRITE; | |
234 | pte.pte_high |= _PAGE_SILENT_WRITE; | |
1da177e4 LT |
235 | } |
236 | return pte; | |
237 | } | |
238 | ||
239 | static inline pte_t pte_mkyoung(pte_t pte) | |
240 | { | |
6e953891 | 241 | pte.pte_low |= _PAGE_ACCESSED; |
057229f9 | 242 | if (pte.pte_low & _PAGE_READ) { |
6e953891 SS |
243 | pte.pte_low |= _PAGE_SILENT_READ; |
244 | pte.pte_high |= _PAGE_SILENT_READ; | |
057229f9 | 245 | } |
1da177e4 LT |
246 | return pte; |
247 | } | |
248 | #else | |
1da177e4 LT |
249 | static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } |
250 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } | |
251 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } | |
252 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } | |
253 | ||
254 | static inline pte_t pte_wrprotect(pte_t pte) | |
255 | { | |
256 | pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); | |
257 | return pte; | |
258 | } | |
259 | ||
1da177e4 LT |
260 | static inline pte_t pte_mkclean(pte_t pte) |
261 | { | |
262 | pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); | |
263 | return pte; | |
264 | } | |
265 | ||
266 | static inline pte_t pte_mkold(pte_t pte) | |
267 | { | |
268 | pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); | |
269 | return pte; | |
270 | } | |
271 | ||
272 | static inline pte_t pte_mkwrite(pte_t pte) | |
273 | { | |
274 | pte_val(pte) |= _PAGE_WRITE; | |
275 | if (pte_val(pte) & _PAGE_MODIFIED) | |
276 | pte_val(pte) |= _PAGE_SILENT_WRITE; | |
277 | return pte; | |
278 | } | |
279 | ||
1da177e4 LT |
280 | static inline pte_t pte_mkdirty(pte_t pte) |
281 | { | |
282 | pte_val(pte) |= _PAGE_MODIFIED; | |
283 | if (pte_val(pte) & _PAGE_WRITE) | |
284 | pte_val(pte) |= _PAGE_SILENT_WRITE; | |
285 | return pte; | |
286 | } | |
287 | ||
288 | static inline pte_t pte_mkyoung(pte_t pte) | |
289 | { | |
290 | pte_val(pte) |= _PAGE_ACCESSED; | |
291 | if (pte_val(pte) & _PAGE_READ) | |
292 | pte_val(pte) |= _PAGE_SILENT_READ; | |
293 | return pte; | |
294 | } | |
295 | #endif | |
7e675137 NP |
296 | static inline int pte_special(pte_t pte) { return 0; } |
297 | static inline pte_t pte_mkspecial(pte_t pte) { return pte; } | |
1da177e4 LT |
298 | |
299 | /* | |
300 | * Macro to make mark a page protection value as "uncacheable". Note | |
301 | * that "protection" is really a misnomer here as the protection value | |
302 | * contains the memory attribute bits, dirty bits, and various other | |
303 | * bits as well. | |
304 | */ | |
305 | #define pgprot_noncached pgprot_noncached | |
306 | ||
307 | static inline pgprot_t pgprot_noncached(pgprot_t _prot) | |
308 | { | |
309 | unsigned long prot = pgprot_val(_prot); | |
310 | ||
311 | prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; | |
312 | ||
313 | return __pgprot(prot); | |
314 | } | |
315 | ||
316 | /* | |
317 | * Conversion functions: convert a page and protection to a page entry, | |
318 | * and a page entry and page directory to the page they refer to. | |
319 | */ | |
320 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
321 | ||
962f480e | 322 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) |
1da177e4 LT |
323 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
324 | { | |
79e0bc37 SS |
325 | pte.pte_low &= _PAGE_CHG_MASK; |
326 | pte.pte_high &= ~0x3f; | |
327 | pte.pte_low |= pgprot_val(newprot); | |
1da177e4 LT |
328 | pte.pte_high |= pgprot_val(newprot) & 0x3f; |
329 | return pte; | |
330 | } | |
331 | #else | |
332 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
333 | { | |
334 | return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); | |
335 | } | |
336 | #endif | |
337 | ||
338 | ||
339 | extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, | |
340 | pte_t pte); | |
341 | extern void __update_cache(struct vm_area_struct *vma, unsigned long address, | |
342 | pte_t pte); | |
343 | ||
344 | static inline void update_mmu_cache(struct vm_area_struct *vma, | |
345 | unsigned long address, pte_t pte) | |
346 | { | |
347 | __update_tlb(vma, address, pte); | |
348 | __update_cache(vma, address, pte); | |
349 | } | |
350 | ||
1da177e4 | 351 | #define kern_addr_valid(addr) (1) |
1da177e4 LT |
352 | |
353 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
1da177e4 LT |
354 | extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); |
355 | ||
1da177e4 LT |
356 | static inline int io_remap_pfn_range(struct vm_area_struct *vma, |
357 | unsigned long vaddr, | |
358 | unsigned long pfn, | |
359 | unsigned long size, | |
360 | pgprot_t prot) | |
361 | { | |
362 | phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); | |
ac5d8c02 | 363 | return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); |
1da177e4 LT |
364 | } |
365 | #else | |
1da177e4 LT |
366 | #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ |
367 | remap_pfn_range(vma, vaddr, pfn, size, prot) | |
368 | #endif | |
369 | ||
1da177e4 LT |
370 | #include <asm-generic/pgtable.h> |
371 | ||
372 | /* | |
373 | * We provide our own get_unmapped area to cope with the virtual aliasing | |
374 | * constraints placed on us by the cache architecture. | |
375 | */ | |
376 | #define HAVE_ARCH_UNMAPPED_AREA | |
377 | ||
378 | /* | |
379 | * No page table caches to initialise | |
380 | */ | |
381 | #define pgtable_cache_init() do { } while (0) | |
382 | ||
383 | #endif /* _ASM_PGTABLE_H */ |