Commit | Line | Data |
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1da177e4 | 1 | /* |
d83ecf08 | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Copyright 2003 PathScale, Inc. |
4 | * Derived from include/asm-i386/pgtable.h | |
5 | * Licensed under the GPL | |
6 | */ | |
7 | ||
8 | #ifndef __UM_PGTABLE_H | |
9 | #define __UM_PGTABLE_H | |
10 | ||
300ecf59 | 11 | #include <asm/fixmap.h> |
1da177e4 LT |
12 | |
13 | #define _PAGE_PRESENT 0x001 | |
14 | #define _PAGE_NEWPAGE 0x002 | |
9b4ee40e | 15 | #define _PAGE_NEWPROT 0x004 |
1da177e4 LT |
16 | #define _PAGE_RW 0x020 |
17 | #define _PAGE_USER 0x040 | |
18 | #define _PAGE_ACCESSED 0x080 | |
19 | #define _PAGE_DIRTY 0x100 | |
9b4ee40e PBG |
20 | /* If _PAGE_PRESENT is clear, we use these: */ |
21 | #define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */ | |
22 | #define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE; | |
23 | pte_present gives true */ | |
1da177e4 LT |
24 | |
25 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
26 | #include "asm/pgtable-3level.h" | |
27 | #else | |
28 | #include "asm/pgtable-2level.h" | |
29 | #endif | |
30 | ||
31 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
32 | ||
1da177e4 LT |
33 | /* zero page used for uninitialized stuff */ |
34 | extern unsigned long *empty_zero_page; | |
35 | ||
36 | #define pgtable_cache_init() do ; while (0) | |
37 | ||
1da177e4 LT |
38 | /* Just any arbitrary offset to the start of the vmalloc VM area: the |
39 | * current 8MB value just means that there will be a 8MB "hole" after the | |
40 | * physical memory until the kernel virtual memory starts. That means that | |
41 | * any out-of-bounds memory accesses will hopefully be caught. | |
42 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
43 | * area for the same reason. ;) | |
44 | */ | |
45 | ||
46 | extern unsigned long end_iomem; | |
47 | ||
48 | #define VMALLOC_OFFSET (__va_space) | |
49 | #define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) | |
1da177e4 LT |
50 | #ifdef CONFIG_HIGHMEM |
51 | # define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE) | |
52 | #else | |
53 | # define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) | |
54 | #endif | |
55 | ||
1da177e4 LT |
56 | #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) |
57 | #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) | |
58 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) | |
59 | ||
60 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) | |
61 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) | |
62 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) | |
63 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) | |
64 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) | |
1da177e4 LT |
65 | |
66 | /* | |
d83ecf08 JD |
67 | * The i386 can't do page protection for execute, and considers that the same |
68 | * are read. | |
69 | * Also, write permissions imply read permissions. This is the closest we can | |
70 | * get.. | |
1da177e4 LT |
71 | */ |
72 | #define __P000 PAGE_NONE | |
73 | #define __P001 PAGE_READONLY | |
74 | #define __P010 PAGE_COPY | |
75 | #define __P011 PAGE_COPY | |
76 | #define __P100 PAGE_READONLY | |
77 | #define __P101 PAGE_READONLY | |
78 | #define __P110 PAGE_COPY | |
79 | #define __P111 PAGE_COPY | |
80 | ||
81 | #define __S000 PAGE_NONE | |
82 | #define __S001 PAGE_READONLY | |
83 | #define __S010 PAGE_SHARED | |
84 | #define __S011 PAGE_SHARED | |
85 | #define __S100 PAGE_READONLY | |
86 | #define __S101 PAGE_READONLY | |
87 | #define __S110 PAGE_SHARED | |
88 | #define __S111 PAGE_SHARED | |
89 | ||
1da177e4 | 90 | /* |
1da177e4 LT |
91 | * ZERO_PAGE is a global shared page that is always zero: used |
92 | * for zero-mapped memory areas etc.. | |
93 | */ | |
1da177e4 LT |
94 | #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) |
95 | ||
1da177e4 LT |
96 | #define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE)) |
97 | ||
705e87c0 | 98 | #define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE)) |
1da177e4 | 99 | #define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) |
d83ecf08 | 100 | |
1da177e4 LT |
101 | #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) |
102 | #define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0) | |
103 | ||
104 | #define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE) | |
105 | #define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE) | |
106 | ||
107 | #define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE) | |
108 | #define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) | |
109 | ||
1da177e4 LT |
110 | #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) |
111 | ||
08964c56 | 112 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
1da177e4 | 113 | |
08964c56 JD |
114 | #define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE)) |
115 | ||
116 | /* | |
117 | * ================================= | |
118 | * Flags checking section. | |
119 | * ================================= | |
120 | */ | |
121 | ||
122 | static inline int pte_none(pte_t pte) | |
123 | { | |
124 | return pte_is_zero(pte); | |
125 | } | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * The following only work if pte_present() is true. | |
129 | * Undefined behaviour if not.. | |
130 | */ | |
1da177e4 LT |
131 | static inline int pte_read(pte_t pte) |
132 | { | |
133 | return((pte_get_bits(pte, _PAGE_USER)) && | |
134 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
135 | } | |
136 | ||
137 | static inline int pte_exec(pte_t pte){ | |
138 | return((pte_get_bits(pte, _PAGE_USER)) && | |
139 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
140 | } | |
141 | ||
142 | static inline int pte_write(pte_t pte) | |
143 | { | |
144 | return((pte_get_bits(pte, _PAGE_RW)) && | |
145 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
146 | } | |
147 | ||
148 | /* | |
149 | * The following only works if pte_present() is not true. | |
150 | */ | |
151 | static inline int pte_file(pte_t pte) | |
152 | { | |
153 | return pte_get_bits(pte, _PAGE_FILE); | |
154 | } | |
155 | ||
156 | static inline int pte_dirty(pte_t pte) | |
157 | { | |
158 | return pte_get_bits(pte, _PAGE_DIRTY); | |
159 | } | |
160 | ||
161 | static inline int pte_young(pte_t pte) | |
162 | { | |
163 | return pte_get_bits(pte, _PAGE_ACCESSED); | |
164 | } | |
165 | ||
166 | static inline int pte_newpage(pte_t pte) | |
167 | { | |
168 | return pte_get_bits(pte, _PAGE_NEWPAGE); | |
169 | } | |
170 | ||
171 | static inline int pte_newprot(pte_t pte) | |
172 | { | |
173 | return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT))); | |
174 | } | |
175 | ||
7e675137 NP |
176 | static inline int pte_special(pte_t pte) |
177 | { | |
178 | return 0; | |
179 | } | |
180 | ||
08964c56 JD |
181 | /* |
182 | * ================================= | |
183 | * Flags setting section. | |
184 | * ================================= | |
185 | */ | |
186 | ||
187 | static inline pte_t pte_mknewprot(pte_t pte) | |
188 | { | |
189 | pte_set_bits(pte, _PAGE_NEWPROT); | |
190 | return(pte); | |
191 | } | |
192 | ||
1da177e4 LT |
193 | static inline pte_t pte_mkclean(pte_t pte) |
194 | { | |
195 | pte_clear_bits(pte, _PAGE_DIRTY); | |
196 | return(pte); | |
197 | } | |
198 | ||
199 | static inline pte_t pte_mkold(pte_t pte) | |
200 | { | |
201 | pte_clear_bits(pte, _PAGE_ACCESSED); | |
202 | return(pte); | |
203 | } | |
204 | ||
205 | static inline pte_t pte_wrprotect(pte_t pte) | |
206 | { | |
207 | pte_clear_bits(pte, _PAGE_RW); | |
208 | return(pte_mknewprot(pte)); | |
209 | } | |
210 | ||
211 | static inline pte_t pte_mkread(pte_t pte) | |
212 | { | |
1463fdbc | 213 | pte_set_bits(pte, _PAGE_USER); |
1da177e4 LT |
214 | return(pte_mknewprot(pte)); |
215 | } | |
216 | ||
1da177e4 LT |
217 | static inline pte_t pte_mkdirty(pte_t pte) |
218 | { | |
219 | pte_set_bits(pte, _PAGE_DIRTY); | |
220 | return(pte); | |
221 | } | |
222 | ||
223 | static inline pte_t pte_mkyoung(pte_t pte) | |
224 | { | |
225 | pte_set_bits(pte, _PAGE_ACCESSED); | |
226 | return(pte); | |
227 | } | |
228 | ||
229 | static inline pte_t pte_mkwrite(pte_t pte) | |
230 | { | |
231 | pte_set_bits(pte, _PAGE_RW); | |
232 | return(pte_mknewprot(pte)); | |
233 | } | |
234 | ||
235 | static inline pte_t pte_mkuptodate(pte_t pte) | |
236 | { | |
237 | pte_clear_bits(pte, _PAGE_NEWPAGE); | |
238 | if(pte_present(pte)) | |
239 | pte_clear_bits(pte, _PAGE_NEWPROT); | |
240 | return(pte); | |
241 | } | |
242 | ||
08964c56 JD |
243 | static inline pte_t pte_mknewpage(pte_t pte) |
244 | { | |
245 | pte_set_bits(pte, _PAGE_NEWPAGE); | |
246 | return(pte); | |
247 | } | |
248 | ||
7e675137 NP |
249 | static inline pte_t pte_mkspecial(pte_t pte) |
250 | { | |
251 | return(pte); | |
252 | } | |
253 | ||
08964c56 JD |
254 | static inline void set_pte(pte_t *pteptr, pte_t pteval) |
255 | { | |
256 | pte_copy(*pteptr, pteval); | |
257 | ||
258 | /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so | |
259 | * fix_range knows to unmap it. _PAGE_NEWPROT is specific to | |
260 | * mapped pages. | |
261 | */ | |
262 | ||
263 | *pteptr = pte_mknewpage(*pteptr); | |
264 | if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr); | |
265 | } | |
266 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
267 | ||
1da177e4 LT |
268 | /* |
269 | * Conversion functions: convert a page and protection to a page entry, | |
270 | * and a page entry and page directory to the page they refer to. | |
271 | */ | |
272 | ||
d99c4022 PBG |
273 | #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) |
274 | #define __virt_to_page(virt) phys_to_page(__pa(virt)) | |
655e4ed0 | 275 | #define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page)) |
d83ecf08 | 276 | #define virt_to_page(addr) __virt_to_page((const unsigned long) addr) |
d99c4022 PBG |
277 | |
278 | #define mk_pte(page, pgprot) \ | |
279 | ({ pte_t pte; \ | |
280 | \ | |
281 | pte_set_val(pte, page_to_phys(page), (pgprot)); \ | |
282 | if (pte_present(pte)) \ | |
283 | pte_mknewprot(pte_mknewpage(pte)); \ | |
284 | pte;}) | |
1da177e4 LT |
285 | |
286 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
287 | { | |
288 | pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot); | |
1da177e4 LT |
289 | return pte; |
290 | } | |
291 | ||
1da177e4 LT |
292 | /* |
293 | * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] | |
294 | * | |
295 | * this macro returns the index of the entry in the pgd page which would | |
296 | * control the given virtual address | |
297 | */ | |
298 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) | |
299 | ||
1da177e4 LT |
300 | /* |
301 | * pgd_offset() returns a (pgd_t *) | |
302 | * pgd_index() is used get the offset into the pgd page's array of pgd_t's; | |
303 | */ | |
304 | #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) | |
305 | ||
306 | /* | |
307 | * a shortcut which implies the use of the kernel's pgd, instead | |
308 | * of a process's | |
309 | */ | |
310 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
311 | ||
312 | /* | |
313 | * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] | |
314 | * | |
315 | * this macro returns the index of the entry in the pmd page which would | |
316 | * control the given virtual address | |
317 | */ | |
300ecf59 | 318 | #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) |
1da177e4 LT |
319 | #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) |
320 | ||
909e90d3 JD |
321 | #define pmd_page_vaddr(pmd) \ |
322 | ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) | |
323 | ||
1da177e4 LT |
324 | /* |
325 | * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] | |
326 | * | |
327 | * this macro returns the index of the entry in the pte page which would | |
328 | * control the given virtual address | |
329 | */ | |
330 | #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
331 | #define pte_offset_kernel(dir, address) \ | |
46a82b2d | 332 | ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) |
1da177e4 LT |
333 | #define pte_offset_map(dir, address) \ |
334 | ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) | |
335 | #define pte_offset_map_nested(dir, address) pte_offset_map(dir, address) | |
336 | #define pte_unmap(pte) do { } while (0) | |
337 | #define pte_unmap_nested(pte) do { } while (0) | |
338 | ||
ca77b555 JD |
339 | struct mm_struct; |
340 | extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); | |
341 | ||
1da177e4 LT |
342 | #define update_mmu_cache(vma,address,pte) do ; while (0) |
343 | ||
344 | /* Encode and de-code a swap entry */ | |
345 | #define __swp_type(x) (((x).val >> 4) & 0x3f) | |
346 | #define __swp_offset(x) ((x).val >> 11) | |
347 | ||
348 | #define __swp_entry(type, offset) \ | |
349 | ((swp_entry_t) { ((type) << 4) | ((offset) << 11) }) | |
350 | #define __pte_to_swp_entry(pte) \ | |
351 | ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) | |
352 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
353 | ||
354 | #define kern_addr_valid(addr) (1) | |
355 | ||
356 | #include <asm-generic/pgtable.h> | |
357 | ||
04add672 | 358 | #endif |