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Diffstat (limited to 'include/asm-arm26/pgtable.h')
-rw-r--r-- | include/asm-arm26/pgtable.h | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/include/asm-arm26/pgtable.h b/include/asm-arm26/pgtable.h deleted file mode 100644 index 55a1a697d12b..000000000000 --- a/include/asm-arm26/pgtable.h +++ /dev/null | |||
@@ -1,298 +0,0 @@ | |||
1 | /* | ||
2 | * linux/include/asm-arm26/pgtable.h | ||
3 | * | ||
4 | * Copyright (C) 2000-2002 Russell King | ||
5 | * Copyright (C) 2003 Ian Molton | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | */ | ||
11 | #ifndef _ASMARM_PGTABLE_H | ||
12 | #define _ASMARM_PGTABLE_H | ||
13 | |||
14 | #include <asm-generic/4level-fixup.h> | ||
15 | |||
16 | #include <asm/memory.h> | ||
17 | |||
18 | /* | ||
19 | * The table below defines the page protection levels that we insert into our | ||
20 | * Linux page table version. These get translated into the best that the | ||
21 | * architecture can perform. Note that on most ARM hardware: | ||
22 | * 1) We cannot do execute protection | ||
23 | * 2) If we could do execute protection, then read is implied | ||
24 | * 3) write implies read permissions | ||
25 | */ | ||
26 | #define __P000 PAGE_NONE | ||
27 | #define __P001 PAGE_READONLY | ||
28 | #define __P010 PAGE_COPY | ||
29 | #define __P011 PAGE_COPY | ||
30 | #define __P100 PAGE_READONLY | ||
31 | #define __P101 PAGE_READONLY | ||
32 | #define __P110 PAGE_COPY | ||
33 | #define __P111 PAGE_COPY | ||
34 | |||
35 | #define __S000 PAGE_NONE | ||
36 | #define __S001 PAGE_READONLY | ||
37 | #define __S010 PAGE_SHARED | ||
38 | #define __S011 PAGE_SHARED | ||
39 | #define __S100 PAGE_READONLY | ||
40 | #define __S101 PAGE_READONLY | ||
41 | #define __S110 PAGE_SHARED | ||
42 | #define __S111 PAGE_SHARED | ||
43 | |||
44 | /* | ||
45 | * PMD_SHIFT determines the size of the area a second-level page table can map | ||
46 | * PGDIR_SHIFT determines what a third-level page table entry can map | ||
47 | */ | ||
48 | #define PGD_SHIFT 25 | ||
49 | #define PMD_SHIFT 20 | ||
50 | |||
51 | #define PGD_SIZE (1UL << PGD_SHIFT) | ||
52 | #define PGD_MASK (~(PGD_SIZE-1)) | ||
53 | #define PMD_SIZE (1UL << PMD_SHIFT) | ||
54 | #define PMD_MASK (~(PMD_SIZE-1)) | ||
55 | |||
56 | /* The kernel likes to use these names for the above (ick) */ | ||
57 | #define PGDIR_SIZE PGD_SIZE | ||
58 | #define PGDIR_MASK PGD_MASK | ||
59 | |||
60 | #define PTRS_PER_PGD 32 | ||
61 | #define PTRS_PER_PMD 1 | ||
62 | #define PTRS_PER_PTE 32 | ||
63 | |||
64 | /* | ||
65 | * This is the lowest virtual address we can permit any user space | ||
66 | * mapping to be mapped at. This is particularly important for | ||
67 | * non-high vector CPUs. | ||
68 | */ | ||
69 | #define FIRST_USER_ADDRESS PAGE_SIZE | ||
70 | |||
71 | #define FIRST_USER_PGD_NR 1 | ||
72 | #define USER_PTRS_PER_PGD ((TASK_SIZE/PGD_SIZE) - FIRST_USER_PGD_NR) | ||
73 | |||
74 | // FIXME - WTF? | ||
75 | #define LIBRARY_TEXT_START 0x0c000000 | ||
76 | |||
77 | |||
78 | |||
79 | #ifndef __ASSEMBLY__ | ||
80 | extern void __pte_error(const char *file, int line, unsigned long val); | ||
81 | extern void __pmd_error(const char *file, int line, unsigned long val); | ||
82 | extern void __pgd_error(const char *file, int line, unsigned long val); | ||
83 | |||
84 | #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) | ||
85 | #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) | ||
86 | #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) | ||
87 | |||
88 | /* | ||
89 | * ZERO_PAGE is a global shared page that is always zero: used | ||
90 | * for zero-mapped memory areas etc.. | ||
91 | */ | ||
92 | extern struct page *empty_zero_page; | ||
93 | #define ZERO_PAGE(vaddr) (empty_zero_page) | ||
94 | |||
95 | #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) | ||
96 | #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) | ||
97 | #define pfn_pte(pfn,prot) (__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))) | ||
98 | #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) | ||
99 | #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) | ||
100 | |||
101 | /* | ||
102 | * Terminology: PGD = Page Directory, PMD = Page Middle Directory, | ||
103 | * PTE = Page Table Entry | ||
104 | * | ||
105 | * on arm26 we have no 2nd level page table. we simulate this by removing the | ||
106 | * PMD. | ||
107 | * | ||
108 | * pgd_none is 0 to prevernt pmd_alloc() calling __pmd_alloc(). This causes it | ||
109 | * to return pmd_offset(pgd,addr) which is a pointer to the pgd (IOW, a no-op). | ||
110 | * | ||
111 | * however, to work this way, whilst we are allocating 32 pgds, containing 32 | ||
112 | * PTEs, the actual work is done on the PMDs, thus: | ||
113 | * | ||
114 | * instead of mm->pgd->pmd->pte | ||
115 | * we have mm->pgdpmd->pte | ||
116 | * | ||
117 | * IOW, think of PGD operations and PMD ones as being the same thing, just | ||
118 | * that PGD stuff deals with the mm_struct side of things, wheras PMD stuff | ||
119 | * deals with the pte side of things. | ||
120 | * | ||
121 | * additionally, we store some bits in the PGD and PTE pointers: | ||
122 | * PGDs: | ||
123 | * o The lowest (1) bit of the PGD is to determine if it is present or swap. | ||
124 | * o The 2nd bit of the PGD is unused and must be zero. | ||
125 | * o The top 6 bits of the PGD must be zero. | ||
126 | * PTEs: | ||
127 | * o The lower 5 bits of a pte are flags. bit 1 is the 'present' flag. The | ||
128 | * others determine the pages attributes. | ||
129 | * | ||
130 | * the pgd_val, pmd_val, and pte_val macros seem to be private to our code. | ||
131 | * They get the RAW value of the PGD/PMD/PTE entry, including our flags | ||
132 | * encoded into the pointers. | ||
133 | * | ||
134 | * The pgd_offset, pmd_offset, and pte_offset macros are used by the kernel, | ||
135 | * so they shouldnt have our flags attached. | ||
136 | * | ||
137 | * If you understood that, feel free to explain it to me... | ||
138 | * | ||
139 | */ | ||
140 | |||
141 | #define _PMD_PRESENT (0x01) | ||
142 | |||
143 | /* These definitions allow us to optimise out stuff like pmd_alloc() */ | ||
144 | #define pgd_none(pgd) (0) | ||
145 | #define pgd_bad(pgd) (0) | ||
146 | #define pgd_present(pgd) (1) | ||
147 | #define pgd_clear(pgdp) do { } while (0) | ||
148 | |||
149 | /* Whilst these handle our actual 'page directory' (the agglomeration of pgd and pmd) | ||
150 | */ | ||
151 | #define pmd_none(pmd) (!pmd_val(pmd)) | ||
152 | #define pmd_bad(pmd) ((pmd_val(pmd) & 0xfc000002)) | ||
153 | #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT) | ||
154 | #define set_pmd(pmd_ptr, pmd) ((*(pmd_ptr)) = (pmd)) | ||
155 | #define pmd_clear(pmdp) set_pmd(pmdp, __pmd(0)) | ||
156 | |||
157 | /* and these handle our pte tables */ | ||
158 | #define pte_none(pte) (!pte_val(pte)) | ||
159 | #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) | ||
160 | #define set_pte(pte_ptr, pte) ((*(pte_ptr)) = (pte)) | ||
161 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | ||
162 | #define pte_clear(mm,addr,ptep) set_pte_at((mm),(addr),(ptep), __pte(0)) | ||
163 | |||
164 | /* macros to ease the getting of pointers to stuff... */ | ||
165 | #define pgd_offset(mm, addr) ((pgd_t *)(mm)->pgd + __pgd_index(addr)) | ||
166 | #define pmd_offset(pgd, addr) ((pmd_t *)(pgd)) | ||
167 | #define pte_offset(pmd, addr) ((pte_t *)pmd_page(*(pmd)) + __pte_index(addr)) | ||
168 | |||
169 | /* there is no __pmd_index as we dont use pmds */ | ||
170 | #define __pgd_index(addr) ((addr) >> PGD_SHIFT) | ||
171 | #define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | ||
172 | |||
173 | |||
174 | /* Keep the kernel happy */ | ||
175 | #define pgd_index(addr) __pgd_index(addr) | ||
176 | #define pgd_offset_k(addr) (pgd_offset(&init_mm, addr)) | ||
177 | |||
178 | /* | ||
179 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | ||
180 | * area for the same reason. ;) FIXME: surely 1 page not 4k ? | ||
181 | */ | ||
182 | #define VMALLOC_START 0x01a00000 | ||
183 | #define VMALLOC_END 0x01c00000 | ||
184 | |||
185 | /* Is pmd_page supposed to return a pointer to a page in some arches? ours seems to | ||
186 | * return a pointer to memory (no special alignment) | ||
187 | */ | ||
188 | #define pmd_page(pmd) ((struct page *)(pmd_val((pmd)) & ~_PMD_PRESENT)) | ||
189 | #define pmd_page_vaddr(pmd) ((pte_t *)(pmd_val((pmd)) & ~_PMD_PRESENT)) | ||
190 | |||
191 | #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) | ||
192 | |||
193 | #define pte_offset_map(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) | ||
194 | #define pte_offset_map_nested(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) | ||
195 | #define pte_unmap(pte) do { } while (0) | ||
196 | #define pte_unmap_nested(pte) do { } while (0) | ||
197 | |||
198 | |||
199 | #define _PAGE_PRESENT 0x01 | ||
200 | #define _PAGE_READONLY 0x02 | ||
201 | #define _PAGE_NOT_USER 0x04 | ||
202 | #define _PAGE_OLD 0x08 | ||
203 | #define _PAGE_CLEAN 0x10 | ||
204 | |||
205 | // an old page has never been read. | ||
206 | // a clean page has never been written. | ||
207 | |||
208 | /* -- present -- -- !dirty -- --- !write --- ---- !user --- */ | ||
209 | #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY | _PAGE_NOT_USER) | ||
210 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CLEAN ) | ||
211 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY ) | ||
212 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY ) | ||
213 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_NOT_USER) | ||
214 | |||
215 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_OLD | _PAGE_CLEAN) | ||
216 | |||
217 | /* | ||
218 | * The following only work if pte_present() is true. | ||
219 | * Undefined behaviour if not.. | ||
220 | */ | ||
221 | #define pte_write(pte) (!(pte_val(pte) & _PAGE_READONLY)) | ||
222 | #define pte_dirty(pte) (!(pte_val(pte) & _PAGE_CLEAN)) | ||
223 | #define pte_young(pte) (!(pte_val(pte) & _PAGE_OLD)) | ||
224 | //ONLY when !pte_present() I think. nicked from arm32 (FIXME!) | ||
225 | #define pte_file(pte) (!(pte_val(pte) & _PAGE_OLD)) | ||
226 | |||
227 | #define PTE_BIT_FUNC(fn,op) \ | ||
228 | static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } | ||
229 | |||
230 | PTE_BIT_FUNC(wrprotect, |= _PAGE_READONLY); | ||
231 | PTE_BIT_FUNC(mkwrite, &= ~_PAGE_READONLY); | ||
232 | PTE_BIT_FUNC(mkclean, |= _PAGE_CLEAN); | ||
233 | PTE_BIT_FUNC(mkdirty, &= ~_PAGE_CLEAN); | ||
234 | PTE_BIT_FUNC(mkold, |= _PAGE_OLD); | ||
235 | PTE_BIT_FUNC(mkyoung, &= ~_PAGE_OLD); | ||
236 | |||
237 | /* | ||
238 | * We don't store cache state bits in the page table here. FIXME - or do we? | ||
239 | */ | ||
240 | #define pgprot_noncached(prot) (prot) | ||
241 | #define pgprot_writecombine(prot) (prot) //FIXME - is a no-op? | ||
242 | |||
243 | extern void pgtable_cache_init(void); | ||
244 | |||
245 | //FIXME - nicked from arm32 and brutally hacked. probably wrong. | ||
246 | #define pte_to_pgoff(x) (pte_val(x) >> 2) | ||
247 | #define pgoff_to_pte(x) __pte(((x) << 2) & ~_PAGE_OLD) | ||
248 | |||
249 | //FIXME - next line borrowed from arm32. is it right? | ||
250 | #define PTE_FILE_MAX_BITS 30 | ||
251 | |||
252 | |||
253 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | ||
254 | { | ||
255 | pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); | ||
256 | return pte; | ||
257 | } | ||
258 | |||
259 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | ||
260 | |||
261 | /* Encode and decode a swap entry. | ||
262 | * | ||
263 | * We support up to 32GB of swap on 4k machines | ||
264 | */ | ||
265 | #define __swp_type(x) (((x).val >> 2) & 0x7f) | ||
266 | #define __swp_offset(x) ((x).val >> 9) | ||
267 | #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 9) }) | ||
268 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | ||
269 | #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) | ||
270 | |||
271 | /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ | ||
272 | /* FIXME: this is not correct */ | ||
273 | #define kern_addr_valid(addr) (1) | ||
274 | |||
275 | /* | ||
276 | * Conversion functions: convert a page and protection to a page entry, | ||
277 | * and a page entry and page directory to the page they refer to. | ||
278 | */ | ||
279 | static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) | ||
280 | { | ||
281 | pte_t pte; | ||
282 | pte_val(pte) = physpage | pgprot_val(pgprot); | ||
283 | return pte; | ||
284 | } | ||
285 | |||
286 | |||
287 | #include <asm-generic/pgtable.h> | ||
288 | |||
289 | /* | ||
290 | * remap a physical page `pfn' of size `size' with page protection `prot' | ||
291 | * into virtual address `from' | ||
292 | */ | ||
293 | #define io_remap_pfn_range(vma,from,pfn,size,prot) \ | ||
294 | remap_pfn_range(vma, from, pfn, size, prot) | ||
295 | |||
296 | #endif /* !__ASSEMBLY__ */ | ||
297 | |||
298 | #endif /* _ASMARM_PGTABLE_H */ | ||