Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
4baa9922 | 2 | * arch/arm/include/asm/pgtable.h |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1995-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #ifndef _ASMARM_PGTABLE_H | |
11 | #define _ASMARM_PGTABLE_H | |
12 | ||
f6e3354d | 13 | #include <linux/const.h> |
002547b4 RK |
14 | #include <asm/proc-fns.h> |
15 | ||
16 | #ifndef CONFIG_MMU | |
17 | ||
a32618d2 | 18 | #include <asm-generic/4level-fixup.h> |
002547b4 RK |
19 | #include "pgtable-nommu.h" |
20 | ||
21 | #else | |
1da177e4 | 22 | |
a32618d2 | 23 | #include <asm-generic/pgtable-nopud.h> |
1da177e4 | 24 | #include <asm/memory.h> |
ad1ae2fe | 25 | #include <asm/pgtable-hwdef.h> |
1da177e4 | 26 | |
dcfdae04 CM |
27 | #ifdef CONFIG_ARM_LPAE |
28 | #include <asm/pgtable-3level.h> | |
29 | #else | |
17f57211 | 30 | #include <asm/pgtable-2level.h> |
dcfdae04 | 31 | #endif |
17f57211 | 32 | |
5c3073e6 RK |
33 | /* |
34 | * Just any arbitrary offset to the start of the vmalloc VM area: the | |
35 | * current 8MB value just means that there will be a 8MB "hole" after the | |
36 | * physical memory until the kernel virtual memory starts. That means that | |
37 | * any out-of-bounds memory accesses will hopefully be caught. | |
38 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
39 | * area for the same reason. ;) | |
5c3073e6 | 40 | */ |
5c3073e6 RK |
41 | #define VMALLOC_OFFSET (8*1024*1024) |
42 | #define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) | |
0536bdf3 | 43 | #define VMALLOC_END 0xff000000UL |
5c3073e6 | 44 | |
1da177e4 LT |
45 | #define LIBRARY_TEXT_START 0x0c000000 |
46 | ||
47 | #ifndef __ASSEMBLY__ | |
69529c0e RK |
48 | extern void __pte_error(const char *file, int line, pte_t); |
49 | extern void __pmd_error(const char *file, int line, pmd_t); | |
50 | extern void __pgd_error(const char *file, int line, pgd_t); | |
1da177e4 | 51 | |
69529c0e RK |
52 | #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte) |
53 | #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd) | |
54 | #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd) | |
1da177e4 | 55 | |
6119be0b HD |
56 | /* |
57 | * This is the lowest virtual address we can permit any user space | |
58 | * mapping to be mapped at. This is particularly important for | |
59 | * non-high vector CPUs. | |
60 | */ | |
61 | #define FIRST_USER_ADDRESS PAGE_SIZE | |
62 | ||
1da177e4 | 63 | /* |
44b18693 I |
64 | * The pgprot_* and protection_map entries will be fixed up in runtime |
65 | * to include the cachable and bufferable bits based on memory policy, | |
66 | * as well as any architecture dependent bits like global/ASID and SMP | |
67 | * shared mapping bits. | |
1da177e4 | 68 | */ |
bb30f36f | 69 | #define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG |
1da177e4 | 70 | |
44b18693 | 71 | extern pgprot_t pgprot_user; |
1da177e4 LT |
72 | extern pgprot_t pgprot_kernel; |
73 | ||
8ec53663 | 74 | #define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b)) |
1da177e4 | 75 | |
36bb94ba RK |
76 | #define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY) |
77 | #define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN) | |
78 | #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER) | |
79 | #define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) | |
80 | #define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY) | |
81 | #define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) | |
82 | #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY) | |
9522d7e4 RK |
83 | #define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN) |
84 | #define PAGE_KERNEL_EXEC pgprot_kernel | |
85 | ||
36bb94ba RK |
86 | #define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN) |
87 | #define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN) | |
88 | #define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER) | |
89 | #define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) | |
90 | #define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY) | |
91 | #define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) | |
92 | #define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY) | |
44b18693 | 93 | |
eb9b2b69 RK |
94 | #define __pgprot_modify(prot,mask,bits) \ |
95 | __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) | |
96 | ||
97 | #define pgprot_noncached(prot) \ | |
98 | __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) | |
99 | ||
100 | #define pgprot_writecombine(prot) \ | |
101 | __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE) | |
102 | ||
8fb54284 SS |
103 | #define pgprot_stronglyordered(prot) \ |
104 | __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) | |
105 | ||
eb9b2b69 RK |
106 | #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE |
107 | #define pgprot_dmacoherent(prot) \ | |
9522d7e4 | 108 | __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN) |
eb9b2b69 RK |
109 | #define __HAVE_PHYS_MEM_ACCESS_PROT |
110 | struct file; | |
111 | extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, | |
112 | unsigned long size, pgprot_t vma_prot); | |
113 | #else | |
114 | #define pgprot_dmacoherent(prot) \ | |
9522d7e4 | 115 | __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN) |
eb9b2b69 RK |
116 | #endif |
117 | ||
1da177e4 LT |
118 | #endif /* __ASSEMBLY__ */ |
119 | ||
120 | /* | |
121 | * The table below defines the page protection levels that we insert into our | |
122 | * Linux page table version. These get translated into the best that the | |
123 | * architecture can perform. Note that on most ARM hardware: | |
124 | * 1) We cannot do execute protection | |
125 | * 2) If we could do execute protection, then read is implied | |
126 | * 3) write implies read permissions | |
127 | */ | |
44b18693 I |
128 | #define __P000 __PAGE_NONE |
129 | #define __P001 __PAGE_READONLY | |
130 | #define __P010 __PAGE_COPY | |
131 | #define __P011 __PAGE_COPY | |
8ec53663 RK |
132 | #define __P100 __PAGE_READONLY_EXEC |
133 | #define __P101 __PAGE_READONLY_EXEC | |
134 | #define __P110 __PAGE_COPY_EXEC | |
135 | #define __P111 __PAGE_COPY_EXEC | |
44b18693 I |
136 | |
137 | #define __S000 __PAGE_NONE | |
138 | #define __S001 __PAGE_READONLY | |
139 | #define __S010 __PAGE_SHARED | |
140 | #define __S011 __PAGE_SHARED | |
8ec53663 RK |
141 | #define __S100 __PAGE_READONLY_EXEC |
142 | #define __S101 __PAGE_READONLY_EXEC | |
143 | #define __S110 __PAGE_SHARED_EXEC | |
144 | #define __S111 __PAGE_SHARED_EXEC | |
1da177e4 LT |
145 | |
146 | #ifndef __ASSEMBLY__ | |
147 | /* | |
148 | * ZERO_PAGE is a global shared page that is always zero: used | |
149 | * for zero-mapped memory areas etc.. | |
150 | */ | |
151 | extern struct page *empty_zero_page; | |
152 | #define ZERO_PAGE(vaddr) (empty_zero_page) | |
153 | ||
4eec4b13 RK |
154 | |
155 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
156 | ||
157 | /* to find an entry in a page-table-directory */ | |
158 | #define pgd_index(addr) ((addr) >> PGDIR_SHIFT) | |
159 | ||
160 | #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) | |
161 | ||
162 | /* to find an entry in a kernel page-table-directory */ | |
163 | #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) | |
164 | ||
b510b049 RK |
165 | #define pmd_none(pmd) (!pmd_val(pmd)) |
166 | #define pmd_present(pmd) (pmd_val(pmd)) | |
b510b049 RK |
167 | |
168 | static inline pte_t *pmd_page_vaddr(pmd_t pmd) | |
169 | { | |
d7c5d0dc | 170 | return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); |
b510b049 RK |
171 | } |
172 | ||
d7c5d0dc | 173 | #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) |
b510b049 | 174 | |
65cec8e3 | 175 | #ifndef CONFIG_HIGHPTE |
b510b049 | 176 | #define __pte_map(pmd) pmd_page_vaddr(*(pmd)) |
ece0e2b6 | 177 | #define __pte_unmap(pte) do { } while (0) |
65cec8e3 | 178 | #else |
d30e45ee RK |
179 | #define __pte_map(pmd) (pte_t *)kmap_atomic(pmd_page(*(pmd))) |
180 | #define __pte_unmap(pte) kunmap_atomic(pte) | |
65cec8e3 | 181 | #endif |
1da177e4 | 182 | |
b510b049 RK |
183 | #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) |
184 | ||
185 | #define pte_offset_kernel(pmd,addr) (pmd_page_vaddr(*(pmd)) + pte_index(addr)) | |
186 | ||
187 | #define pte_offset_map(pmd,addr) (__pte_map(pmd) + pte_index(addr)) | |
188 | #define pte_unmap(pte) __pte_unmap(pte) | |
189 | ||
d7c5d0dc | 190 | #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) |
cae6292b | 191 | #define pfn_pte(pfn,prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot)) |
b510b049 RK |
192 | |
193 | #define pte_page(pte) pfn_to_page(pte_pfn(pte)) | |
194 | #define mk_pte(page,prot) pfn_pte(page_to_pfn(page), prot) | |
195 | ||
b510b049 | 196 | #define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0) |
ad1ae2fe | 197 | |
47f12043 WD |
198 | #define pte_none(pte) (!pte_val(pte)) |
199 | #define pte_present(pte) (pte_val(pte) & L_PTE_PRESENT) | |
200 | #define pte_write(pte) (!(pte_val(pte) & L_PTE_RDONLY)) | |
201 | #define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY) | |
202 | #define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG) | |
203 | #define pte_exec(pte) (!(pte_val(pte) & L_PTE_XN)) | |
204 | #define pte_special(pte) (0) | |
205 | ||
206 | #define pte_present_user(pte) \ | |
207 | ((pte_val(pte) & (L_PTE_PRESENT | L_PTE_USER)) == \ | |
208 | (L_PTE_PRESENT | L_PTE_USER)) | |
209 | ||
6012191a CM |
210 | #if __LINUX_ARM_ARCH__ < 6 |
211 | static inline void __sync_icache_dcache(pte_t pteval) | |
212 | { | |
213 | } | |
214 | #else | |
215 | extern void __sync_icache_dcache(pte_t pteval); | |
216 | #endif | |
217 | ||
218 | static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, | |
219 | pte_t *ptep, pte_t pteval) | |
220 | { | |
47f12043 WD |
221 | unsigned long ext = 0; |
222 | ||
223 | if (addr < TASK_SIZE && pte_present_user(pteval)) { | |
6012191a | 224 | __sync_icache_dcache(pteval); |
47f12043 | 225 | ext |= PTE_EXT_NG; |
6012191a | 226 | } |
1da177e4 | 227 | |
47f12043 WD |
228 | set_pte_ext(ptep, pteval, ext); |
229 | } | |
6012191a | 230 | |
1da177e4 LT |
231 | #define PTE_BIT_FUNC(fn,op) \ |
232 | static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } | |
233 | ||
36bb94ba RK |
234 | PTE_BIT_FUNC(wrprotect, |= L_PTE_RDONLY); |
235 | PTE_BIT_FUNC(mkwrite, &= ~L_PTE_RDONLY); | |
1da177e4 LT |
236 | PTE_BIT_FUNC(mkclean, &= ~L_PTE_DIRTY); |
237 | PTE_BIT_FUNC(mkdirty, |= L_PTE_DIRTY); | |
238 | PTE_BIT_FUNC(mkold, &= ~L_PTE_YOUNG); | |
239 | PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG); | |
240 | ||
7e675137 NP |
241 | static inline pte_t pte_mkspecial(pte_t pte) { return pte; } |
242 | ||
1da177e4 LT |
243 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
244 | { | |
36bb94ba | 245 | const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER; |
1da177e4 LT |
246 | pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); |
247 | return pte; | |
248 | } | |
249 | ||
fb93a1c7 RK |
250 | /* |
251 | * Encode and decode a swap entry. Swap entries are stored in the Linux | |
252 | * page tables as follows: | |
253 | * | |
254 | * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
255 | * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 | |
f5f2025e | 256 | * <--------------- offset ----------------------> < type -> 0 0 0 |
1da177e4 | 257 | * |
f5f2025e | 258 | * This gives us up to 31 swap files and 64GB per swap file. Note that |
fb93a1c7 | 259 | * the offset field is always non-zero. |
1da177e4 | 260 | */ |
6a00cded | 261 | #define __SWP_TYPE_SHIFT 3 |
f5f2025e | 262 | #define __SWP_TYPE_BITS 5 |
fb93a1c7 RK |
263 | #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) |
264 | #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) | |
265 | ||
266 | #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) | |
267 | #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) | |
268 | #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) | |
269 | ||
1da177e4 LT |
270 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
271 | #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) | |
272 | ||
fb93a1c7 RK |
273 | /* |
274 | * It is an error for the kernel to have more swap files than we can | |
275 | * encode in the PTEs. This ensures that we know when MAX_SWAPFILES | |
276 | * is increased beyond what we presently support. | |
277 | */ | |
278 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) | |
279 | ||
65b1bfc1 RK |
280 | /* |
281 | * Encode and decode a file entry. File entries are stored in the Linux | |
282 | * page tables as follows: | |
283 | * | |
284 | * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
285 | * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 | |
6a00cded | 286 | * <----------------------- offset ------------------------> 1 0 0 |
65b1bfc1 RK |
287 | */ |
288 | #define pte_file(pte) (pte_val(pte) & L_PTE_FILE) | |
6a00cded RK |
289 | #define pte_to_pgoff(x) (pte_val(x) >> 3) |
290 | #define pgoff_to_pte(x) __pte(((x) << 3) | L_PTE_FILE) | |
65b1bfc1 | 291 | |
6a00cded | 292 | #define PTE_FILE_MAX_BITS 29 |
65b1bfc1 | 293 | |
1da177e4 LT |
294 | /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ |
295 | /* FIXME: this is not correct */ | |
296 | #define kern_addr_valid(addr) (1) | |
297 | ||
298 | #include <asm-generic/pgtable.h> | |
299 | ||
300 | /* | |
301 | * We provide our own arch_get_unmapped_area to cope with VIPT caches. | |
302 | */ | |
303 | #define HAVE_ARCH_UNMAPPED_AREA | |
7dbaa466 | 304 | #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN |
1da177e4 LT |
305 | |
306 | /* | |
33bf5610 | 307 | * remap a physical page `pfn' of size `size' with page protection `prot' |
1da177e4 LT |
308 | * into virtual address `from' |
309 | */ | |
1da177e4 LT |
310 | #define io_remap_pfn_range(vma,from,pfn,size,prot) \ |
311 | remap_pfn_range(vma, from, pfn, size, prot) | |
312 | ||
1da177e4 LT |
313 | #define pgtable_cache_init() do { } while (0) |
314 | ||
315 | #endif /* !__ASSEMBLY__ */ | |
316 | ||
002547b4 RK |
317 | #endif /* CONFIG_MMU */ |
318 | ||
1da177e4 | 319 | #endif /* _ASMARM_PGTABLE_H */ |