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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 | ||
1da177e4 LT |
17 | /* |
18 | * PAGE_SHIFT determines the page size | |
19 | */ | |
20 | #ifdef CONFIG_PAGE_SIZE_4KB | |
21 | #define PAGE_SHIFT 12 | |
22 | #endif | |
23 | #ifdef CONFIG_PAGE_SIZE_8KB | |
24 | #define PAGE_SHIFT 13 | |
25 | #endif | |
26 | #ifdef CONFIG_PAGE_SIZE_16KB | |
27 | #define PAGE_SHIFT 14 | |
28 | #endif | |
29 | #ifdef CONFIG_PAGE_SIZE_64KB | |
30 | #define PAGE_SHIFT 16 | |
31 | #endif | |
32 | #define PAGE_SIZE (1UL << PAGE_SHIFT) | |
33 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
34 | ||
1da177e4 LT |
35 | #ifndef __ASSEMBLY__ |
36 | ||
37 | extern void clear_page(void * page); | |
38 | extern void copy_page(void * to, void * from); | |
39 | ||
40 | extern unsigned long shm_align_mask; | |
41 | ||
42 | static inline unsigned long pages_do_alias(unsigned long addr1, | |
43 | unsigned long addr2) | |
44 | { | |
45 | return (addr1 ^ addr2) & shm_align_mask; | |
46 | } | |
47 | ||
48 | struct page; | |
49 | ||
50 | static inline void clear_user_page(void *addr, unsigned long vaddr, | |
51 | struct page *page) | |
52 | { | |
53 | extern void (*flush_data_cache_page)(unsigned long addr); | |
54 | ||
55 | clear_page(addr); | |
56 | if (pages_do_alias((unsigned long) addr, vaddr)) | |
57 | flush_data_cache_page((unsigned long)addr); | |
58 | } | |
59 | ||
60 | static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
61 | struct page *to) | |
62 | { | |
63 | extern void (*flush_data_cache_page)(unsigned long addr); | |
64 | ||
65 | copy_page(vto, vfrom); | |
66 | if (pages_do_alias((unsigned long)vto, vaddr)) | |
67 | flush_data_cache_page((unsigned long)vto); | |
68 | } | |
69 | ||
70 | /* | |
71 | * These are used to make use of C type-checking.. | |
72 | */ | |
73 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
ec917c2c | 74 | #ifdef CONFIG_CPU_MIPS32 |
1da177e4 LT |
75 | typedef struct { unsigned long pte_low, pte_high; } pte_t; |
76 | #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) | |
77 | #else | |
78 | typedef struct { unsigned long long pte; } pte_t; | |
79 | #define pte_val(x) ((x).pte) | |
80 | #endif | |
81 | #else | |
82 | typedef struct { unsigned long pte; } pte_t; | |
83 | #define pte_val(x) ((x).pte) | |
84 | #endif | |
c6e8b587 | 85 | #define __pte(x) ((pte_t) { (x) } ) |
1da177e4 | 86 | |
c6e8b587 RB |
87 | /* |
88 | * For 3-level pagetables we defines these ourselves, for 2-level the | |
89 | * definitions are supplied by <asm-generic/pgtable-nopmd.h>. | |
90 | */ | |
91 | #ifdef CONFIG_64BIT | |
1da177e4 | 92 | |
c6e8b587 | 93 | typedef struct { unsigned long pmd; } pmd_t; |
1da177e4 | 94 | #define pmd_val(x) ((x).pmd) |
c6e8b587 | 95 | #define __pmd(x) ((pmd_t) { (x) } ) |
1da177e4 | 96 | |
c6e8b587 | 97 | #endif |
1da177e4 | 98 | |
c6e8b587 RB |
99 | /* |
100 | * Right now we don't support 4-level pagetables, so all pud-related | |
101 | * definitions come from <asm-generic/pgtable-nopud.h>. | |
102 | */ | |
103 | ||
104 | /* | |
105 | * Finall the top of the hierarchy, the pgd | |
106 | */ | |
107 | typedef struct { unsigned long pgd; } pgd_t; | |
108 | #define pgd_val(x) ((x).pgd) | |
1da177e4 | 109 | #define __pgd(x) ((pgd_t) { (x) } ) |
c6e8b587 RB |
110 | |
111 | /* | |
112 | * Manipulate page protection bits | |
113 | */ | |
114 | typedef struct { unsigned long pgprot; } pgprot_t; | |
115 | #define pgprot_val(x) ((x).pgprot) | |
1da177e4 LT |
116 | #define __pgprot(x) ((pgprot_t) { (x) } ) |
117 | ||
c6e8b587 RB |
118 | /* |
119 | * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd | |
120 | * pair of pages we only have a single global bit per pair of pages. When | |
121 | * writing to the TLB make sure we always have the bit set for both pages | |
122 | * or none. This macro is used to access the `buddy' of the pte we're just | |
123 | * working on. | |
124 | */ | |
125 | #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) | |
126 | ||
1da177e4 LT |
127 | #endif /* !__ASSEMBLY__ */ |
128 | ||
129 | /* to align the pointer to the (next) page boundary */ | |
130 | #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) | |
131 | ||
132 | #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) | |
133 | #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) | |
134 | ||
135 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
136 | ||
e53639d8 RB |
137 | #ifdef CONFIG_FLATMEM |
138 | ||
139 | #define pfn_valid(pfn) ((pfn) < max_mapnr) | |
140 | ||
7de58fab AN |
141 | #elif defined(CONFIG_SPARSEMEM) |
142 | ||
143 | /* pfn_valid is defined in linux/mmzone.h */ | |
144 | ||
e53639d8 RB |
145 | #elif defined(CONFIG_NEED_MULTIPLE_NODES) |
146 | ||
147 | #define pfn_valid(pfn) \ | |
148 | ({ \ | |
149 | unsigned long __pfn = (pfn); \ | |
150 | int __n = pfn_to_nid(__pfn); \ | |
151 | ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ | |
152 | NODE_DATA(__n)->node_spanned_pages) \ | |
153 | : 0); \ | |
154 | }) | |
155 | ||
e53639d8 RB |
156 | #endif |
157 | ||
1da177e4 LT |
158 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
159 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
160 | ||
161 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
162 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
163 | ||
164 | #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) | |
165 | #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) | |
166 | ||
1da177e4 LT |
167 | #ifdef CONFIG_LIMITED_DMA |
168 | #define WANT_PAGE_VIRTUAL | |
169 | #endif | |
170 | ||
a02036e7 | 171 | #include <asm-generic/memory_model.h> |
fd4fd5aa SR |
172 | #include <asm-generic/page.h> |
173 | ||
a2aa3e23 DW |
174 | #endif /* defined (__KERNEL__) */ |
175 | ||
1da177e4 | 176 | #endif /* _ASM_PAGE_H */ |