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1 | /* |
2 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
3 | * Copyright (C) 2009 Wind River Systems Inc | |
4 | * | |
5 | * Based on asm/pgtable-32.h from mips which is: | |
6 | * | |
7 | * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle | |
8 | * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. | |
9 | * | |
10 | * This file is subject to the terms and conditions of the GNU General Public | |
11 | * License. See the file "COPYING" in the main directory of this archive | |
12 | * for more details. | |
13 | */ | |
14 | ||
15 | #ifndef _ASM_NIOS2_PGTABLE_H | |
16 | #define _ASM_NIOS2_PGTABLE_H | |
17 | ||
18 | #include <linux/io.h> | |
19 | #include <linux/bug.h> | |
20 | #include <asm/page.h> | |
21 | #include <asm/cacheflush.h> | |
22 | #include <asm/tlbflush.h> | |
23 | ||
24 | #include <asm/pgtable-bits.h> | |
25 | #include <asm-generic/pgtable-nopmd.h> | |
26 | ||
d016bf7e | 27 | #define FIRST_USER_ADDRESS 0UL |
cbd15b3f LFT |
28 | |
29 | #define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE | |
30 | #define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1) | |
31 | ||
32 | struct mm_struct; | |
33 | ||
34 | /* Helper macro */ | |
35 | #define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \ | |
36 | ((x) ? _PAGE_EXEC : 0) | \ | |
37 | ((r) ? _PAGE_READ : 0) | \ | |
38 | ((w) ? _PAGE_WRITE : 0)) | |
39 | /* | |
40 | * These are the macros that generic kernel code needs | |
41 | * (to populate protection_map[]) | |
42 | */ | |
43 | ||
44 | /* Remove W bit on private pages for COW support */ | |
45 | #define __P000 MKP(0, 0, 0) | |
46 | #define __P001 MKP(0, 0, 1) | |
47 | #define __P010 MKP(0, 0, 0) /* COW */ | |
48 | #define __P011 MKP(0, 0, 1) /* COW */ | |
49 | #define __P100 MKP(1, 0, 0) | |
50 | #define __P101 MKP(1, 0, 1) | |
51 | #define __P110 MKP(1, 0, 0) /* COW */ | |
52 | #define __P111 MKP(1, 0, 1) /* COW */ | |
53 | ||
54 | /* Shared pages can have exact HW mapping */ | |
55 | #define __S000 MKP(0, 0, 0) | |
56 | #define __S001 MKP(0, 0, 1) | |
57 | #define __S010 MKP(0, 1, 0) | |
58 | #define __S011 MKP(0, 1, 1) | |
59 | #define __S100 MKP(1, 0, 0) | |
60 | #define __S101 MKP(1, 0, 1) | |
61 | #define __S110 MKP(1, 1, 0) | |
62 | #define __S111 MKP(1, 1, 1) | |
63 | ||
64 | /* Used all over the kernel */ | |
65 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ | |
66 | _PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL) | |
67 | ||
68 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ | |
69 | _PAGE_WRITE | _PAGE_ACCESSED) | |
70 | ||
71 | #define PAGE_COPY MKP(0, 0, 1) | |
72 | ||
73 | #define PGD_ORDER 0 | |
74 | #define PTE_ORDER 0 | |
75 | ||
76 | #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) | |
77 | #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) | |
78 | ||
79 | #define USER_PTRS_PER_PGD \ | |
80 | (CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE) | |
81 | ||
82 | #define PGDIR_SHIFT 22 | |
83 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | |
84 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
85 | ||
86 | /* | |
87 | * ZERO_PAGE is a global shared page that is always zero: used | |
88 | * for zero-mapped memory areas etc.. | |
89 | */ | |
90 | extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; | |
91 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) | |
92 | ||
93 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
94 | extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)]; | |
95 | ||
96 | /* | |
97 | * (pmds are folded into puds so this doesn't get actually called, | |
98 | * but the define is needed for a generic inline function.) | |
99 | */ | |
100 | static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval) | |
101 | { | |
102 | pmdptr->pud.pgd.pgd = pmdval.pud.pgd.pgd; | |
103 | } | |
104 | ||
105 | /* to find an entry in a page-table-directory */ | |
106 | #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
107 | #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) | |
108 | ||
109 | static inline int pte_write(pte_t pte) \ | |
110 | { return pte_val(pte) & _PAGE_WRITE; } | |
111 | static inline int pte_dirty(pte_t pte) \ | |
112 | { return pte_val(pte) & _PAGE_DIRTY; } | |
113 | static inline int pte_young(pte_t pte) \ | |
114 | { return pte_val(pte) & _PAGE_ACCESSED; } | |
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115 | static inline int pte_special(pte_t pte) { return 0; } |
116 | ||
117 | #define pgprot_noncached pgprot_noncached | |
118 | ||
119 | static inline pgprot_t pgprot_noncached(pgprot_t _prot) | |
120 | { | |
121 | unsigned long prot = pgprot_val(_prot); | |
122 | ||
123 | prot &= ~_PAGE_CACHED; | |
124 | ||
125 | return __pgprot(prot); | |
126 | } | |
127 | ||
128 | static inline int pte_none(pte_t pte) | |
129 | { | |
130 | return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf)); | |
131 | } | |
132 | ||
133 | static inline int pte_present(pte_t pte) \ | |
134 | { return pte_val(pte) & _PAGE_PRESENT; } | |
135 | ||
136 | /* | |
137 | * The following only work if pte_present() is true. | |
138 | * Undefined behaviour if not.. | |
139 | */ | |
140 | static inline pte_t pte_wrprotect(pte_t pte) | |
141 | { | |
142 | pte_val(pte) &= ~_PAGE_WRITE; | |
143 | return pte; | |
144 | } | |
145 | ||
146 | static inline pte_t pte_mkclean(pte_t pte) | |
147 | { | |
148 | pte_val(pte) &= ~_PAGE_DIRTY; | |
149 | return pte; | |
150 | } | |
151 | ||
152 | static inline pte_t pte_mkold(pte_t pte) | |
153 | { | |
154 | pte_val(pte) &= ~_PAGE_ACCESSED; | |
155 | return pte; | |
156 | } | |
157 | ||
158 | static inline pte_t pte_mkwrite(pte_t pte) | |
159 | { | |
160 | pte_val(pte) |= _PAGE_WRITE; | |
161 | return pte; | |
162 | } | |
163 | ||
164 | static inline pte_t pte_mkdirty(pte_t pte) | |
165 | { | |
166 | pte_val(pte) |= _PAGE_DIRTY; | |
167 | return pte; | |
168 | } | |
169 | ||
170 | static inline pte_t pte_mkspecial(pte_t pte) { return pte; } | |
171 | ||
172 | static inline pte_t pte_mkyoung(pte_t pte) | |
173 | { | |
174 | pte_val(pte) |= _PAGE_ACCESSED; | |
175 | return pte; | |
176 | } | |
177 | ||
178 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
179 | { | |
180 | const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC; | |
181 | ||
182 | pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); | |
183 | return pte; | |
184 | } | |
185 | ||
186 | static inline int pmd_present(pmd_t pmd) | |
187 | { | |
188 | return (pmd_val(pmd) != (unsigned long) invalid_pte_table) | |
189 | && (pmd_val(pmd) != 0UL); | |
190 | } | |
191 | ||
192 | static inline void pmd_clear(pmd_t *pmdp) | |
193 | { | |
194 | pmd_val(*pmdp) = (unsigned long) invalid_pte_table; | |
195 | } | |
196 | ||
197 | #define pte_pfn(pte) (pte_val(pte) & 0xfffff) | |
198 | #define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot))) | |
199 | #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) | |
200 | ||
201 | /* | |
202 | * Store a linux PTE into the linux page table. | |
203 | */ | |
204 | static inline void set_pte(pte_t *ptep, pte_t pteval) | |
205 | { | |
206 | *ptep = pteval; | |
207 | } | |
208 | ||
209 | static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, | |
210 | pte_t *ptep, pte_t pteval) | |
211 | { | |
046982c7 | 212 | unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval)); |
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213 | |
214 | flush_dcache_range(paddr, paddr + PAGE_SIZE); | |
215 | set_pte(ptep, pteval); | |
216 | } | |
217 | ||
218 | static inline int pmd_none(pmd_t pmd) | |
219 | { | |
220 | return (pmd_val(pmd) == | |
221 | (unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL); | |
222 | } | |
223 | ||
224 | #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) | |
225 | ||
226 | static inline void pte_clear(struct mm_struct *mm, | |
227 | unsigned long addr, pte_t *ptep) | |
228 | { | |
229 | pte_t null; | |
230 | ||
231 | pte_val(null) = (addr >> PAGE_SHIFT) & 0xf; | |
232 | ||
233 | set_pte_at(mm, addr, ptep, null); | |
234 | flush_tlb_one(addr); | |
235 | } | |
236 | ||
237 | /* | |
238 | * Conversion functions: convert a page and protection to a page entry, | |
239 | * and a page entry and page directory to the page they refer to. | |
240 | */ | |
241 | #define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot)) | |
242 | ||
243 | #define pte_unmap(pte) do { } while (0) | |
244 | ||
245 | /* | |
246 | * Conversion functions: convert a page and protection to a page entry, | |
247 | * and a page entry and page directory to the page they refer to. | |
248 | */ | |
249 | #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) | |
250 | #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) | |
251 | #define pmd_page_vaddr(pmd) pmd_val(pmd) | |
252 | ||
253 | #define pte_offset_map(dir, addr) \ | |
254 | ((pte_t *) page_address(pmd_page(*dir)) + \ | |
255 | (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) | |
256 | ||
257 | /* to find an entry in a kernel page-table-directory */ | |
258 | #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) | |
259 | ||
260 | /* Get the address to the PTE for a vaddr in specific directory */ | |
261 | #define pte_offset_kernel(dir, addr) \ | |
262 | ((pte_t *) pmd_page_vaddr(*(dir)) + \ | |
263 | (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) | |
264 | ||
265 | #define pte_ERROR(e) \ | |
266 | pr_err("%s:%d: bad pte %08lx.\n", \ | |
267 | __FILE__, __LINE__, pte_val(e)) | |
268 | #define pgd_ERROR(e) \ | |
269 | pr_err("%s:%d: bad pgd %08lx.\n", \ | |
270 | __FILE__, __LINE__, pgd_val(e)) | |
271 | ||
272 | /* | |
3ee802ea | 273 | * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte): |
cbd15b3f LFT |
274 | * |
275 | * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0 | |
276 | * 0 0 0 0 type. 0 0 0 0 0 0 offset......... | |
277 | * | |
278 | * This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file. | |
279 | * | |
280 | * Note that the offset field is always non-zero, thus !pte_none(pte) is always | |
281 | * true. | |
282 | */ | |
283 | #define __swp_type(swp) (((swp).val >> 26) & 0x3) | |
284 | #define __swp_offset(swp) ((swp).val & 0xfffff) | |
285 | #define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \ | |
286 | | ((off) & 0xfffff) }) | |
287 | #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) | |
288 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
289 | ||
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290 | #define kern_addr_valid(addr) (1) |
291 | ||
292 | #include <asm-generic/pgtable.h> | |
293 | ||
294 | #define pgtable_cache_init() do { } while (0) | |
295 | ||
296 | extern void __init paging_init(void); | |
297 | extern void __init mmu_init(void); | |
298 | ||
299 | extern void update_mmu_cache(struct vm_area_struct *vma, | |
300 | unsigned long address, pte_t *pte); | |
301 | ||
302 | #endif /* _ASM_NIOS2_PGTABLE_H */ |