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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) | |
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 | ||
11 | #include "linux/sched.h" | |
12 | #include "linux/linkage.h" | |
13 | #include "asm/processor.h" | |
14 | #include "asm/page.h" | |
15 | #include "asm/fixmap.h" | |
16 | ||
17 | #define _PAGE_PRESENT 0x001 | |
18 | #define _PAGE_NEWPAGE 0x002 | |
9b4ee40e | 19 | #define _PAGE_NEWPROT 0x004 |
1da177e4 LT |
20 | #define _PAGE_RW 0x020 |
21 | #define _PAGE_USER 0x040 | |
22 | #define _PAGE_ACCESSED 0x080 | |
23 | #define _PAGE_DIRTY 0x100 | |
9b4ee40e PBG |
24 | /* If _PAGE_PRESENT is clear, we use these: */ |
25 | #define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */ | |
26 | #define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE; | |
27 | pte_present gives true */ | |
1da177e4 LT |
28 | |
29 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
30 | #include "asm/pgtable-3level.h" | |
31 | #else | |
32 | #include "asm/pgtable-2level.h" | |
33 | #endif | |
34 | ||
35 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
36 | ||
37 | extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt, | |
38 | pte_t *pte_out); | |
39 | ||
40 | /* zero page used for uninitialized stuff */ | |
41 | extern unsigned long *empty_zero_page; | |
42 | ||
43 | #define pgtable_cache_init() do ; while (0) | |
44 | ||
45 | /* | |
46 | * pgd entries used up by user/kernel: | |
47 | */ | |
48 | ||
49 | #define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT) | |
50 | #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS) | |
51 | ||
52 | #ifndef __ASSEMBLY__ | |
53 | /* Just any arbitrary offset to the start of the vmalloc VM area: the | |
54 | * current 8MB value just means that there will be a 8MB "hole" after the | |
55 | * physical memory until the kernel virtual memory starts. That means that | |
56 | * any out-of-bounds memory accesses will hopefully be caught. | |
57 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
58 | * area for the same reason. ;) | |
59 | */ | |
60 | ||
61 | extern unsigned long end_iomem; | |
62 | ||
63 | #define VMALLOC_OFFSET (__va_space) | |
64 | #define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) | |
65 | ||
66 | #ifdef CONFIG_HIGHMEM | |
67 | # define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE) | |
68 | #else | |
69 | # define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) | |
70 | #endif | |
71 | ||
72 | #define REGION_SHIFT (sizeof(pte_t) * 8 - 4) | |
73 | #define REGION_MASK (((unsigned long) 0xf) << REGION_SHIFT) | |
74 | ||
75 | #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) | |
76 | #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) | |
77 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) | |
78 | ||
79 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) | |
80 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) | |
81 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) | |
82 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) | |
83 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) | |
84 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED) | |
85 | ||
86 | /* | |
87 | * The i386 can't do page protection for execute, and considers that the same are read. | |
88 | * Also, write permissions imply read permissions. This is the closest we can get.. | |
89 | */ | |
90 | #define __P000 PAGE_NONE | |
91 | #define __P001 PAGE_READONLY | |
92 | #define __P010 PAGE_COPY | |
93 | #define __P011 PAGE_COPY | |
94 | #define __P100 PAGE_READONLY | |
95 | #define __P101 PAGE_READONLY | |
96 | #define __P110 PAGE_COPY | |
97 | #define __P111 PAGE_COPY | |
98 | ||
99 | #define __S000 PAGE_NONE | |
100 | #define __S001 PAGE_READONLY | |
101 | #define __S010 PAGE_SHARED | |
102 | #define __S011 PAGE_SHARED | |
103 | #define __S100 PAGE_READONLY | |
104 | #define __S101 PAGE_READONLY | |
105 | #define __S110 PAGE_SHARED | |
106 | #define __S111 PAGE_SHARED | |
107 | ||
108 | /* | |
109 | * Define this if things work differently on an i386 and an i486: | |
110 | * it will (on an i486) warn about kernel memory accesses that are | |
3d675548 | 111 | * done without a 'access_ok(VERIFY_WRITE,..)' |
1da177e4 LT |
112 | */ |
113 | #undef TEST_VERIFY_AREA | |
114 | ||
115 | /* page table for 0-4MB for everybody */ | |
116 | extern unsigned long pg0[1024]; | |
117 | ||
118 | /* | |
1da177e4 LT |
119 | * ZERO_PAGE is a global shared page that is always zero: used |
120 | * for zero-mapped memory areas etc.. | |
121 | */ | |
1da177e4 LT |
122 | |
123 | #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) | |
124 | ||
125 | /* number of bits that fit into a memory pointer */ | |
126 | #define BITS_PER_PTR (8*sizeof(unsigned long)) | |
127 | ||
128 | /* to align the pointer to a pointer address */ | |
129 | #define PTR_MASK (~(sizeof(void*)-1)) | |
130 | ||
131 | /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */ | |
132 | /* 64-bit machines, beware! SRB. */ | |
133 | #define SIZEOF_PTR_LOG2 3 | |
134 | ||
135 | /* to find an entry in a page-table */ | |
136 | #define PAGE_PTR(address) \ | |
137 | ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK) | |
138 | ||
139 | #define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE)) | |
140 | ||
705e87c0 | 141 | #define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE)) |
1da177e4 LT |
142 | #define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) |
143 | #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) | |
144 | #define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0) | |
145 | ||
146 | #define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE) | |
147 | #define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE) | |
148 | ||
149 | #define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE) | |
150 | #define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) | |
151 | ||
152 | #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) | |
153 | ||
154 | #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) | |
155 | ||
08964c56 | 156 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
1da177e4 LT |
157 | #define pte_address(x) (__va(pte_val(x) & PAGE_MASK)) |
158 | #define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT)) | |
159 | #define phys_addr(p) ((p) & ~REGION_MASK) | |
160 | ||
08964c56 JD |
161 | #define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE)) |
162 | ||
163 | /* | |
164 | * ================================= | |
165 | * Flags checking section. | |
166 | * ================================= | |
167 | */ | |
168 | ||
169 | static inline int pte_none(pte_t pte) | |
170 | { | |
171 | return pte_is_zero(pte); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * The following only work if pte_present() is true. | |
176 | * Undefined behaviour if not.. | |
177 | */ | |
178 | static inline int pte_user(pte_t pte) | |
179 | { | |
180 | return((pte_get_bits(pte, _PAGE_USER)) && | |
181 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
182 | } | |
183 | ||
184 | static inline int pte_read(pte_t pte) | |
185 | { | |
186 | return((pte_get_bits(pte, _PAGE_USER)) && | |
187 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
188 | } | |
189 | ||
190 | static inline int pte_exec(pte_t pte){ | |
191 | return((pte_get_bits(pte, _PAGE_USER)) && | |
192 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
193 | } | |
194 | ||
195 | static inline int pte_write(pte_t pte) | |
196 | { | |
197 | return((pte_get_bits(pte, _PAGE_RW)) && | |
198 | !(pte_get_bits(pte, _PAGE_PROTNONE))); | |
199 | } | |
200 | ||
201 | /* | |
202 | * The following only works if pte_present() is not true. | |
203 | */ | |
204 | static inline int pte_file(pte_t pte) | |
205 | { | |
206 | return pte_get_bits(pte, _PAGE_FILE); | |
207 | } | |
208 | ||
209 | static inline int pte_dirty(pte_t pte) | |
210 | { | |
211 | return pte_get_bits(pte, _PAGE_DIRTY); | |
212 | } | |
213 | ||
214 | static inline int pte_young(pte_t pte) | |
215 | { | |
216 | return pte_get_bits(pte, _PAGE_ACCESSED); | |
217 | } | |
218 | ||
219 | static inline int pte_newpage(pte_t pte) | |
220 | { | |
221 | return pte_get_bits(pte, _PAGE_NEWPAGE); | |
222 | } | |
223 | ||
224 | static inline int pte_newprot(pte_t pte) | |
225 | { | |
226 | return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT))); | |
227 | } | |
228 | ||
08964c56 JD |
229 | /* |
230 | * ================================= | |
231 | * Flags setting section. | |
232 | * ================================= | |
233 | */ | |
234 | ||
235 | static inline pte_t pte_mknewprot(pte_t pte) | |
236 | { | |
237 | pte_set_bits(pte, _PAGE_NEWPROT); | |
238 | return(pte); | |
239 | } | |
240 | ||
1da177e4 LT |
241 | static inline pte_t pte_rdprotect(pte_t pte) |
242 | { | |
243 | pte_clear_bits(pte, _PAGE_USER); | |
244 | return(pte_mknewprot(pte)); | |
245 | } | |
246 | ||
247 | static inline pte_t pte_exprotect(pte_t pte) | |
248 | { | |
249 | pte_clear_bits(pte, _PAGE_USER); | |
250 | return(pte_mknewprot(pte)); | |
251 | } | |
252 | ||
253 | static inline pte_t pte_mkclean(pte_t pte) | |
254 | { | |
255 | pte_clear_bits(pte, _PAGE_DIRTY); | |
256 | return(pte); | |
257 | } | |
258 | ||
259 | static inline pte_t pte_mkold(pte_t pte) | |
260 | { | |
261 | pte_clear_bits(pte, _PAGE_ACCESSED); | |
262 | return(pte); | |
263 | } | |
264 | ||
265 | static inline pte_t pte_wrprotect(pte_t pte) | |
266 | { | |
267 | pte_clear_bits(pte, _PAGE_RW); | |
268 | return(pte_mknewprot(pte)); | |
269 | } | |
270 | ||
271 | static inline pte_t pte_mkread(pte_t pte) | |
272 | { | |
273 | pte_set_bits(pte, _PAGE_RW); | |
274 | return(pte_mknewprot(pte)); | |
275 | } | |
276 | ||
1da177e4 LT |
277 | static inline pte_t pte_mkdirty(pte_t pte) |
278 | { | |
279 | pte_set_bits(pte, _PAGE_DIRTY); | |
280 | return(pte); | |
281 | } | |
282 | ||
283 | static inline pte_t pte_mkyoung(pte_t pte) | |
284 | { | |
285 | pte_set_bits(pte, _PAGE_ACCESSED); | |
286 | return(pte); | |
287 | } | |
288 | ||
289 | static inline pte_t pte_mkwrite(pte_t pte) | |
290 | { | |
291 | pte_set_bits(pte, _PAGE_RW); | |
292 | return(pte_mknewprot(pte)); | |
293 | } | |
294 | ||
295 | static inline pte_t pte_mkuptodate(pte_t pte) | |
296 | { | |
297 | pte_clear_bits(pte, _PAGE_NEWPAGE); | |
298 | if(pte_present(pte)) | |
299 | pte_clear_bits(pte, _PAGE_NEWPROT); | |
300 | return(pte); | |
301 | } | |
302 | ||
08964c56 JD |
303 | static inline pte_t pte_mknewpage(pte_t pte) |
304 | { | |
305 | pte_set_bits(pte, _PAGE_NEWPAGE); | |
306 | return(pte); | |
307 | } | |
308 | ||
309 | static inline void set_pte(pte_t *pteptr, pte_t pteval) | |
310 | { | |
311 | pte_copy(*pteptr, pteval); | |
312 | ||
313 | /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so | |
314 | * fix_range knows to unmap it. _PAGE_NEWPROT is specific to | |
315 | * mapped pages. | |
316 | */ | |
317 | ||
318 | *pteptr = pte_mknewpage(*pteptr); | |
319 | if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr); | |
320 | } | |
321 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
322 | ||
1da177e4 LT |
323 | /* |
324 | * Conversion functions: convert a page and protection to a page entry, | |
325 | * and a page entry and page directory to the page they refer to. | |
326 | */ | |
327 | ||
d99c4022 PBG |
328 | #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) |
329 | #define __virt_to_page(virt) phys_to_page(__pa(virt)) | |
330 | #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) | |
331 | ||
332 | #define mk_pte(page, pgprot) \ | |
333 | ({ pte_t pte; \ | |
334 | \ | |
335 | pte_set_val(pte, page_to_phys(page), (pgprot)); \ | |
336 | if (pte_present(pte)) \ | |
337 | pte_mknewprot(pte_mknewpage(pte)); \ | |
338 | pte;}) | |
1da177e4 LT |
339 | |
340 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
341 | { | |
342 | pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot); | |
1da177e4 LT |
343 | return pte; |
344 | } | |
345 | ||
46a82b2d | 346 | #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) |
1da177e4 LT |
347 | |
348 | /* | |
349 | * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] | |
350 | * | |
351 | * this macro returns the index of the entry in the pgd page which would | |
352 | * control the given virtual address | |
353 | */ | |
354 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) | |
355 | ||
356 | #define pgd_index_k(addr) pgd_index(addr) | |
357 | ||
358 | /* | |
359 | * pgd_offset() returns a (pgd_t *) | |
360 | * pgd_index() is used get the offset into the pgd page's array of pgd_t's; | |
361 | */ | |
362 | #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) | |
363 | ||
364 | /* | |
365 | * a shortcut which implies the use of the kernel's pgd, instead | |
366 | * of a process's | |
367 | */ | |
368 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
369 | ||
370 | /* | |
371 | * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] | |
372 | * | |
373 | * this macro returns the index of the entry in the pmd page which would | |
374 | * control the given virtual address | |
375 | */ | |
376 | #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) | |
377 | ||
378 | /* | |
379 | * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] | |
380 | * | |
381 | * this macro returns the index of the entry in the pte page which would | |
382 | * control the given virtual address | |
383 | */ | |
384 | #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
385 | #define pte_offset_kernel(dir, address) \ | |
46a82b2d | 386 | ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) |
1da177e4 LT |
387 | #define pte_offset_map(dir, address) \ |
388 | ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) | |
389 | #define pte_offset_map_nested(dir, address) pte_offset_map(dir, address) | |
390 | #define pte_unmap(pte) do { } while (0) | |
391 | #define pte_unmap_nested(pte) do { } while (0) | |
392 | ||
393 | #define update_mmu_cache(vma,address,pte) do ; while (0) | |
394 | ||
395 | /* Encode and de-code a swap entry */ | |
396 | #define __swp_type(x) (((x).val >> 4) & 0x3f) | |
397 | #define __swp_offset(x) ((x).val >> 11) | |
398 | ||
399 | #define __swp_entry(type, offset) \ | |
400 | ((swp_entry_t) { ((type) << 4) | ((offset) << 11) }) | |
401 | #define __pte_to_swp_entry(pte) \ | |
402 | ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) | |
403 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
404 | ||
405 | #define kern_addr_valid(addr) (1) | |
406 | ||
407 | #include <asm-generic/pgtable.h> | |
408 | ||
409 | #include <asm-generic/pgtable-nopud.h> | |
410 | ||
411 | #endif | |
412 | #endif | |
413 | ||
1da177e4 LT |
414 | #define virt_to_page(addr) __virt_to_page((const unsigned long) addr) |
415 | ||
416 | /* | |
417 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
418 | * Emacs will notice this stuff at the end of the file and automatically | |
419 | * adjust the settings for this buffer only. This must remain at the end | |
420 | * of the file. | |
421 | * --------------------------------------------------------------------------- | |
422 | * Local variables: | |
423 | * c-file-style: "linux" | |
424 | * End: | |
425 | */ |