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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | */ | |
9 | #ifndef _ASM_PAGE_H | |
10 | #define _ASM_PAGE_H | |
11 | ||
1da177e4 LT |
12 | |
13 | #ifdef __KERNEL__ | |
14 | ||
15 | #include <spaces.h> | |
16 | ||
17 | #endif | |
18 | ||
19 | /* | |
20 | * PAGE_SHIFT determines the page size | |
21 | */ | |
22 | #ifdef CONFIG_PAGE_SIZE_4KB | |
23 | #define PAGE_SHIFT 12 | |
24 | #endif | |
25 | #ifdef CONFIG_PAGE_SIZE_8KB | |
26 | #define PAGE_SHIFT 13 | |
27 | #endif | |
28 | #ifdef CONFIG_PAGE_SIZE_16KB | |
29 | #define PAGE_SHIFT 14 | |
30 | #endif | |
31 | #ifdef CONFIG_PAGE_SIZE_64KB | |
32 | #define PAGE_SHIFT 16 | |
33 | #endif | |
34 | #define PAGE_SIZE (1UL << PAGE_SHIFT) | |
35 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
36 | ||
37 | ||
38 | #ifdef __KERNEL__ | |
39 | #ifndef __ASSEMBLY__ | |
40 | ||
41 | extern void clear_page(void * page); | |
42 | extern void copy_page(void * to, void * from); | |
43 | ||
44 | extern unsigned long shm_align_mask; | |
45 | ||
46 | static inline unsigned long pages_do_alias(unsigned long addr1, | |
47 | unsigned long addr2) | |
48 | { | |
49 | return (addr1 ^ addr2) & shm_align_mask; | |
50 | } | |
51 | ||
52 | struct page; | |
53 | ||
54 | static inline void clear_user_page(void *addr, unsigned long vaddr, | |
55 | struct page *page) | |
56 | { | |
57 | extern void (*flush_data_cache_page)(unsigned long addr); | |
58 | ||
59 | clear_page(addr); | |
60 | if (pages_do_alias((unsigned long) addr, vaddr)) | |
61 | flush_data_cache_page((unsigned long)addr); | |
62 | } | |
63 | ||
64 | static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
65 | struct page *to) | |
66 | { | |
67 | extern void (*flush_data_cache_page)(unsigned long addr); | |
68 | ||
69 | copy_page(vto, vfrom); | |
70 | if (pages_do_alias((unsigned long)vto, vaddr)) | |
71 | flush_data_cache_page((unsigned long)vto); | |
72 | } | |
73 | ||
74 | /* | |
75 | * These are used to make use of C type-checking.. | |
76 | */ | |
77 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
ec917c2c | 78 | #ifdef CONFIG_CPU_MIPS32 |
1da177e4 LT |
79 | typedef struct { unsigned long pte_low, pte_high; } pte_t; |
80 | #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) | |
81 | #else | |
82 | typedef struct { unsigned long long pte; } pte_t; | |
83 | #define pte_val(x) ((x).pte) | |
84 | #endif | |
85 | #else | |
86 | typedef struct { unsigned long pte; } pte_t; | |
87 | #define pte_val(x) ((x).pte) | |
88 | #endif | |
c6e8b587 | 89 | #define __pte(x) ((pte_t) { (x) } ) |
1da177e4 | 90 | |
c6e8b587 RB |
91 | /* |
92 | * For 3-level pagetables we defines these ourselves, for 2-level the | |
93 | * definitions are supplied by <asm-generic/pgtable-nopmd.h>. | |
94 | */ | |
95 | #ifdef CONFIG_64BIT | |
1da177e4 | 96 | |
c6e8b587 | 97 | typedef struct { unsigned long pmd; } pmd_t; |
1da177e4 | 98 | #define pmd_val(x) ((x).pmd) |
c6e8b587 | 99 | #define __pmd(x) ((pmd_t) { (x) } ) |
1da177e4 | 100 | |
c6e8b587 | 101 | #endif |
1da177e4 | 102 | |
c6e8b587 RB |
103 | /* |
104 | * Right now we don't support 4-level pagetables, so all pud-related | |
105 | * definitions come from <asm-generic/pgtable-nopud.h>. | |
106 | */ | |
107 | ||
108 | /* | |
109 | * Finall the top of the hierarchy, the pgd | |
110 | */ | |
111 | typedef struct { unsigned long pgd; } pgd_t; | |
112 | #define pgd_val(x) ((x).pgd) | |
1da177e4 | 113 | #define __pgd(x) ((pgd_t) { (x) } ) |
c6e8b587 RB |
114 | |
115 | /* | |
116 | * Manipulate page protection bits | |
117 | */ | |
118 | typedef struct { unsigned long pgprot; } pgprot_t; | |
119 | #define pgprot_val(x) ((x).pgprot) | |
1da177e4 LT |
120 | #define __pgprot(x) ((pgprot_t) { (x) } ) |
121 | ||
c6e8b587 RB |
122 | /* |
123 | * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd | |
124 | * pair of pages we only have a single global bit per pair of pages. When | |
125 | * writing to the TLB make sure we always have the bit set for both pages | |
126 | * or none. This macro is used to access the `buddy' of the pte we're just | |
127 | * working on. | |
128 | */ | |
129 | #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) | |
130 | ||
1da177e4 LT |
131 | #endif /* !__ASSEMBLY__ */ |
132 | ||
133 | /* to align the pointer to the (next) page boundary */ | |
134 | #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) | |
135 | ||
136 | #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) | |
137 | #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) | |
138 | ||
139 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
140 | ||
b1c231f5 | 141 | #ifndef CONFIG_SPARSEMEM |
b4819b59 | 142 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
143 | #define pfn_valid(pfn) ((pfn) < max_mapnr) |
144 | #endif | |
b1c231f5 | 145 | #endif |
1da177e4 | 146 | |
e53639d8 RB |
147 | #ifdef CONFIG_FLATMEM |
148 | ||
149 | #define pfn_valid(pfn) ((pfn) < max_mapnr) | |
150 | ||
151 | #elif defined(CONFIG_NEED_MULTIPLE_NODES) | |
152 | ||
153 | #define pfn_valid(pfn) \ | |
154 | ({ \ | |
155 | unsigned long __pfn = (pfn); \ | |
156 | int __n = pfn_to_nid(__pfn); \ | |
157 | ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ | |
158 | NODE_DATA(__n)->node_spanned_pages) \ | |
159 | : 0); \ | |
160 | }) | |
161 | ||
162 | #else | |
163 | #error Provide a definition of pfn_valid | |
164 | #endif | |
165 | ||
1da177e4 LT |
166 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
167 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
168 | ||
169 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
170 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
171 | ||
172 | #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) | |
173 | #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) | |
174 | ||
175 | #endif /* defined (__KERNEL__) */ | |
176 | ||
177 | #ifdef CONFIG_LIMITED_DMA | |
178 | #define WANT_PAGE_VIRTUAL | |
179 | #endif | |
180 | ||
a02036e7 | 181 | #include <asm-generic/memory_model.h> |
fd4fd5aa SR |
182 | #include <asm-generic/page.h> |
183 | ||
1da177e4 | 184 | #endif /* _ASM_PAGE_H */ |