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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 | ||
11 | #include <asm-generic/4level-fixup.h> | |
12 | ||
13 | #include <linux/config.h> | |
875d43e7 | 14 | #ifdef CONFIG_32BIT |
1da177e4 LT |
15 | #include <asm/pgtable-32.h> |
16 | #endif | |
875d43e7 | 17 | #ifdef CONFIG_64BIT |
1da177e4 LT |
18 | #include <asm/pgtable-64.h> |
19 | #endif | |
20 | ||
21 | #include <asm/pgtable-bits.h> | |
22 | ||
23 | #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) | |
24 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ | |
25 | PAGE_CACHABLE_DEFAULT) | |
26 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ | |
27 | PAGE_CACHABLE_DEFAULT) | |
28 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ | |
29 | PAGE_CACHABLE_DEFAULT) | |
30 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ | |
31 | _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT) | |
32 | #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ | |
33 | PAGE_CACHABLE_DEFAULT) | |
34 | #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ | |
35 | __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) | |
36 | ||
37 | /* | |
38 | * MIPS can't do page protection for execute, and considers that the same like | |
39 | * read. Also, write permissions imply read permissions. This is the closest | |
40 | * we can get by reasonable means.. | |
41 | */ | |
42 | #define __P000 PAGE_NONE | |
43 | #define __P001 PAGE_READONLY | |
44 | #define __P010 PAGE_COPY | |
45 | #define __P011 PAGE_COPY | |
46 | #define __P100 PAGE_READONLY | |
47 | #define __P101 PAGE_READONLY | |
48 | #define __P110 PAGE_COPY | |
49 | #define __P111 PAGE_COPY | |
50 | ||
51 | #define __S000 PAGE_NONE | |
52 | #define __S001 PAGE_READONLY | |
53 | #define __S010 PAGE_SHARED | |
54 | #define __S011 PAGE_SHARED | |
55 | #define __S100 PAGE_READONLY | |
56 | #define __S101 PAGE_READONLY | |
57 | #define __S110 PAGE_SHARED | |
58 | #define __S111 PAGE_SHARED | |
59 | ||
60 | /* | |
61 | * ZERO_PAGE is a global shared page that is always zero; used | |
62 | * for zero-mapped memory areas etc.. | |
63 | */ | |
64 | ||
65 | extern unsigned long empty_zero_page; | |
66 | extern unsigned long zero_page_mask; | |
67 | ||
68 | #define ZERO_PAGE(vaddr) \ | |
69 | (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))) | |
70 | ||
71 | extern void paging_init(void); | |
72 | ||
73 | /* | |
74 | * Conversion functions: convert a page and protection to a page entry, | |
75 | * and a page entry and page directory to the page they refer to. | |
76 | */ | |
77 | #define page_pte(page) page_pte_prot(page, __pgprot(0)) | |
78 | #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET) | |
79 | #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) | |
80 | #define pmd_page_kernel(pmd) pmd_val(pmd) | |
81 | ||
82 | #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) | |
83 | #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) | |
84 | ||
85 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) | |
86 | static inline void set_pte(pte_t *ptep, pte_t pte) | |
87 | { | |
88 | ptep->pte_high = pte.pte_high; | |
89 | smp_wmb(); | |
90 | ptep->pte_low = pte.pte_low; | |
91 | //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); | |
92 | ||
93 | if (pte_val(pte) & _PAGE_GLOBAL) { | |
94 | pte_t *buddy = ptep_buddy(ptep); | |
95 | /* | |
96 | * Make sure the buddy is global too (if it's !none, | |
97 | * it better already be global) | |
98 | */ | |
99 | if (pte_none(*buddy)) | |
100 | buddy->pte_low |= _PAGE_GLOBAL; | |
101 | } | |
102 | } | |
103 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
104 | ||
105 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
106 | { | |
107 | /* Preserve global status for the pair */ | |
108 | if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) | |
109 | set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); | |
110 | else | |
111 | set_pte_at(mm, addr, ptep, __pte(0)); | |
112 | } | |
113 | #else | |
114 | /* | |
115 | * Certain architectures need to do special things when pte's | |
116 | * within a page table are directly modified. Thus, the following | |
117 | * hook is made available. | |
118 | */ | |
119 | static inline void set_pte(pte_t *ptep, pte_t pteval) | |
120 | { | |
121 | *ptep = pteval; | |
122 | #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) | |
123 | if (pte_val(pteval) & _PAGE_GLOBAL) { | |
124 | pte_t *buddy = ptep_buddy(ptep); | |
125 | /* | |
126 | * Make sure the buddy is global too (if it's !none, | |
127 | * it better already be global) | |
128 | */ | |
129 | if (pte_none(*buddy)) | |
130 | pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; | |
131 | } | |
132 | #endif | |
133 | } | |
134 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
135 | ||
136 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
137 | { | |
138 | #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) | |
139 | /* Preserve global status for the pair */ | |
140 | if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) | |
141 | set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); | |
142 | else | |
143 | #endif | |
144 | set_pte_at(mm, addr, ptep, __pte(0)); | |
145 | } | |
146 | #endif | |
147 | ||
148 | /* | |
149 | * (pmds are folded into pgds so this doesn't get actually called, | |
150 | * but the define is needed for a generic inline function.) | |
151 | */ | |
152 | #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) | |
153 | #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0) | |
154 | ||
155 | #define PGD_T_LOG2 ffz(~sizeof(pgd_t)) | |
156 | #define PMD_T_LOG2 ffz(~sizeof(pmd_t)) | |
157 | #define PTE_T_LOG2 ffz(~sizeof(pte_t)) | |
158 | ||
159 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
160 | ||
161 | /* | |
162 | * The following only work if pte_present() is true. | |
163 | * Undefined behaviour if not.. | |
164 | */ | |
165 | static inline int pte_user(pte_t pte) { BUG(); return 0; } | |
166 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) | |
167 | static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; } | |
168 | static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; } | |
169 | static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; } | |
170 | static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; } | |
171 | static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; } | |
172 | static inline pte_t pte_wrprotect(pte_t pte) | |
173 | { | |
174 | (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); | |
175 | (pte).pte_high &= ~_PAGE_SILENT_WRITE; | |
176 | return pte; | |
177 | } | |
178 | ||
179 | static inline pte_t pte_rdprotect(pte_t pte) | |
180 | { | |
181 | (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ); | |
182 | (pte).pte_high &= ~_PAGE_SILENT_READ; | |
183 | return pte; | |
184 | } | |
185 | ||
186 | static inline pte_t pte_mkclean(pte_t pte) | |
187 | { | |
188 | (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); | |
189 | (pte).pte_high &= ~_PAGE_SILENT_WRITE; | |
190 | return pte; | |
191 | } | |
192 | ||
193 | static inline pte_t pte_mkold(pte_t pte) | |
194 | { | |
195 | (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); | |
196 | (pte).pte_high &= ~_PAGE_SILENT_READ; | |
197 | return pte; | |
198 | } | |
199 | ||
200 | static inline pte_t pte_mkwrite(pte_t pte) | |
201 | { | |
202 | (pte).pte_low |= _PAGE_WRITE; | |
203 | if ((pte).pte_low & _PAGE_MODIFIED) { | |
204 | (pte).pte_low |= _PAGE_SILENT_WRITE; | |
205 | (pte).pte_high |= _PAGE_SILENT_WRITE; | |
206 | } | |
207 | return pte; | |
208 | } | |
209 | ||
210 | static inline pte_t pte_mkread(pte_t pte) | |
211 | { | |
212 | (pte).pte_low |= _PAGE_READ; | |
213 | if ((pte).pte_low & _PAGE_ACCESSED) { | |
214 | (pte).pte_low |= _PAGE_SILENT_READ; | |
215 | (pte).pte_high |= _PAGE_SILENT_READ; | |
216 | } | |
217 | return pte; | |
218 | } | |
219 | ||
220 | static inline pte_t pte_mkdirty(pte_t pte) | |
221 | { | |
222 | (pte).pte_low |= _PAGE_MODIFIED; | |
223 | if ((pte).pte_low & _PAGE_WRITE) { | |
224 | (pte).pte_low |= _PAGE_SILENT_WRITE; | |
225 | (pte).pte_high |= _PAGE_SILENT_WRITE; | |
226 | } | |
227 | return pte; | |
228 | } | |
229 | ||
230 | static inline pte_t pte_mkyoung(pte_t pte) | |
231 | { | |
232 | (pte).pte_low |= _PAGE_ACCESSED; | |
233 | if ((pte).pte_low & _PAGE_READ) | |
234 | (pte).pte_low |= _PAGE_SILENT_READ; | |
235 | (pte).pte_high |= _PAGE_SILENT_READ; | |
236 | return pte; | |
237 | } | |
238 | #else | |
239 | static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; } | |
240 | static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } | |
241 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } | |
242 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } | |
243 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } | |
244 | ||
245 | static inline pte_t pte_wrprotect(pte_t pte) | |
246 | { | |
247 | pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); | |
248 | return pte; | |
249 | } | |
250 | ||
251 | static inline pte_t pte_rdprotect(pte_t pte) | |
252 | { | |
253 | pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ); | |
254 | return pte; | |
255 | } | |
256 | ||
257 | static inline pte_t pte_mkclean(pte_t pte) | |
258 | { | |
259 | pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); | |
260 | return pte; | |
261 | } | |
262 | ||
263 | static inline pte_t pte_mkold(pte_t pte) | |
264 | { | |
265 | pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); | |
266 | return pte; | |
267 | } | |
268 | ||
269 | static inline pte_t pte_mkwrite(pte_t pte) | |
270 | { | |
271 | pte_val(pte) |= _PAGE_WRITE; | |
272 | if (pte_val(pte) & _PAGE_MODIFIED) | |
273 | pte_val(pte) |= _PAGE_SILENT_WRITE; | |
274 | return pte; | |
275 | } | |
276 | ||
277 | static inline pte_t pte_mkread(pte_t pte) | |
278 | { | |
279 | pte_val(pte) |= _PAGE_READ; | |
280 | if (pte_val(pte) & _PAGE_ACCESSED) | |
281 | pte_val(pte) |= _PAGE_SILENT_READ; | |
282 | return pte; | |
283 | } | |
284 | ||
285 | static inline pte_t pte_mkdirty(pte_t pte) | |
286 | { | |
287 | pte_val(pte) |= _PAGE_MODIFIED; | |
288 | if (pte_val(pte) & _PAGE_WRITE) | |
289 | pte_val(pte) |= _PAGE_SILENT_WRITE; | |
290 | return pte; | |
291 | } | |
292 | ||
293 | static inline pte_t pte_mkyoung(pte_t pte) | |
294 | { | |
295 | pte_val(pte) |= _PAGE_ACCESSED; | |
296 | if (pte_val(pte) & _PAGE_READ) | |
297 | pte_val(pte) |= _PAGE_SILENT_READ; | |
298 | return pte; | |
299 | } | |
300 | #endif | |
301 | ||
302 | /* | |
303 | * Macro to make mark a page protection value as "uncacheable". Note | |
304 | * that "protection" is really a misnomer here as the protection value | |
305 | * contains the memory attribute bits, dirty bits, and various other | |
306 | * bits as well. | |
307 | */ | |
308 | #define pgprot_noncached pgprot_noncached | |
309 | ||
310 | static inline pgprot_t pgprot_noncached(pgprot_t _prot) | |
311 | { | |
312 | unsigned long prot = pgprot_val(_prot); | |
313 | ||
314 | prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; | |
315 | ||
316 | return __pgprot(prot); | |
317 | } | |
318 | ||
319 | /* | |
320 | * Conversion functions: convert a page and protection to a page entry, | |
321 | * and a page entry and page directory to the page they refer to. | |
322 | */ | |
323 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
324 | ||
325 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) | |
326 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
327 | { | |
328 | pte.pte_low &= _PAGE_CHG_MASK; | |
329 | pte.pte_low |= pgprot_val(newprot); | |
330 | pte.pte_high |= pgprot_val(newprot) & 0x3f; | |
331 | return pte; | |
332 | } | |
333 | #else | |
334 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
335 | { | |
336 | return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); | |
337 | } | |
338 | #endif | |
339 | ||
340 | ||
341 | extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, | |
342 | pte_t pte); | |
343 | extern void __update_cache(struct vm_area_struct *vma, unsigned long address, | |
344 | pte_t pte); | |
345 | ||
346 | static inline void update_mmu_cache(struct vm_area_struct *vma, | |
347 | unsigned long address, pte_t pte) | |
348 | { | |
349 | __update_tlb(vma, address, pte); | |
350 | __update_cache(vma, address, pte); | |
351 | } | |
352 | ||
b4819b59 | 353 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
354 | #define kern_addr_valid(addr) (1) |
355 | #endif | |
356 | ||
357 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
358 | extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size); | |
359 | extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); | |
360 | ||
361 | static inline int io_remap_page_range(struct vm_area_struct *vma, | |
362 | unsigned long vaddr, | |
363 | unsigned long paddr, | |
364 | unsigned long size, | |
365 | pgprot_t prot) | |
366 | { | |
367 | phys_t phys_addr_high = fixup_bigphys_addr(paddr, size); | |
368 | return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); | |
369 | } | |
370 | ||
371 | static inline int io_remap_pfn_range(struct vm_area_struct *vma, | |
372 | unsigned long vaddr, | |
373 | unsigned long pfn, | |
374 | unsigned long size, | |
375 | pgprot_t prot) | |
376 | { | |
377 | phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); | |
378 | return remap_pfn_range(vma, vaddr, pfn, size, prot); | |
379 | } | |
380 | #else | |
381 | #define io_remap_page_range(vma, vaddr, paddr, size, prot) \ | |
382 | remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot) | |
383 | #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ | |
384 | remap_pfn_range(vma, vaddr, pfn, size, prot) | |
385 | #endif | |
386 | ||
387 | #define MK_IOSPACE_PFN(space, pfn) (pfn) | |
388 | #define GET_IOSPACE(pfn) 0 | |
389 | #define GET_PFN(pfn) (pfn) | |
390 | ||
391 | #include <asm-generic/pgtable.h> | |
392 | ||
393 | /* | |
394 | * We provide our own get_unmapped area to cope with the virtual aliasing | |
395 | * constraints placed on us by the cache architecture. | |
396 | */ | |
397 | #define HAVE_ARCH_UNMAPPED_AREA | |
398 | ||
399 | /* | |
400 | * No page table caches to initialise | |
401 | */ | |
402 | #define pgtable_cache_init() do { } while (0) | |
403 | ||
404 | #endif /* _ASM_PGTABLE_H */ |