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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 | ||
585fa724 RB |
37 | #include <asm/cpu-features.h> |
38 | ||
1da177e4 LT |
39 | extern void clear_page(void * page); |
40 | extern void copy_page(void * to, void * from); | |
41 | ||
42 | extern unsigned long shm_align_mask; | |
43 | ||
44 | static inline unsigned long pages_do_alias(unsigned long addr1, | |
45 | unsigned long addr2) | |
46 | { | |
47 | return (addr1 ^ addr2) & shm_align_mask; | |
48 | } | |
49 | ||
50 | struct page; | |
51 | ||
52 | static inline void clear_user_page(void *addr, unsigned long vaddr, | |
53 | struct page *page) | |
54 | { | |
55 | extern void (*flush_data_cache_page)(unsigned long addr); | |
56 | ||
57 | clear_page(addr); | |
585fa724 | 58 | if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) |
1da177e4 LT |
59 | flush_data_cache_page((unsigned long)addr); |
60 | } | |
61 | ||
62 | static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
63 | struct page *to) | |
64 | { | |
65 | extern void (*flush_data_cache_page)(unsigned long addr); | |
66 | ||
67 | copy_page(vto, vfrom); | |
585fa724 RB |
68 | if (!cpu_has_ic_fills_f_dc || |
69 | pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) | |
1da177e4 LT |
70 | flush_data_cache_page((unsigned long)vto); |
71 | } | |
72 | ||
73 | /* | |
74 | * These are used to make use of C type-checking.. | |
75 | */ | |
76 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
ec917c2c | 77 | #ifdef CONFIG_CPU_MIPS32 |
1da177e4 LT |
78 | typedef struct { unsigned long pte_low, pte_high; } pte_t; |
79 | #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) | |
d34555fb | 80 | #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) |
1da177e4 LT |
81 | #else |
82 | typedef struct { unsigned long long pte; } pte_t; | |
83 | #define pte_val(x) ((x).pte) | |
d34555fb | 84 | #define __pte(x) ((pte_t) { (x) } ) |
1da177e4 LT |
85 | #endif |
86 | #else | |
87 | typedef struct { unsigned long pte; } pte_t; | |
88 | #define pte_val(x) ((x).pte) | |
c6e8b587 | 89 | #define __pte(x) ((pte_t) { (x) } ) |
d34555fb | 90 | #endif |
1da177e4 | 91 | |
c6e8b587 RB |
92 | /* |
93 | * For 3-level pagetables we defines these ourselves, for 2-level the | |
94 | * definitions are supplied by <asm-generic/pgtable-nopmd.h>. | |
95 | */ | |
96 | #ifdef CONFIG_64BIT | |
1da177e4 | 97 | |
c6e8b587 | 98 | typedef struct { unsigned long pmd; } pmd_t; |
1da177e4 | 99 | #define pmd_val(x) ((x).pmd) |
c6e8b587 | 100 | #define __pmd(x) ((pmd_t) { (x) } ) |
1da177e4 | 101 | |
c6e8b587 | 102 | #endif |
1da177e4 | 103 | |
c6e8b587 RB |
104 | /* |
105 | * Right now we don't support 4-level pagetables, so all pud-related | |
106 | * definitions come from <asm-generic/pgtable-nopud.h>. | |
107 | */ | |
108 | ||
109 | /* | |
110 | * Finall the top of the hierarchy, the pgd | |
111 | */ | |
112 | typedef struct { unsigned long pgd; } pgd_t; | |
113 | #define pgd_val(x) ((x).pgd) | |
1da177e4 | 114 | #define __pgd(x) ((pgd_t) { (x) } ) |
c6e8b587 RB |
115 | |
116 | /* | |
117 | * Manipulate page protection bits | |
118 | */ | |
119 | typedef struct { unsigned long pgprot; } pgprot_t; | |
120 | #define pgprot_val(x) ((x).pgprot) | |
1da177e4 LT |
121 | #define __pgprot(x) ((pgprot_t) { (x) } ) |
122 | ||
c6e8b587 RB |
123 | /* |
124 | * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd | |
125 | * pair of pages we only have a single global bit per pair of pages. When | |
126 | * writing to the TLB make sure we always have the bit set for both pages | |
127 | * or none. This macro is used to access the `buddy' of the pte we're just | |
128 | * working on. | |
129 | */ | |
130 | #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) | |
131 | ||
1da177e4 LT |
132 | #endif /* !__ASSEMBLY__ */ |
133 | ||
134 | /* to align the pointer to the (next) page boundary */ | |
135 | #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) | |
136 | ||
137 | #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) | |
138 | #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) | |
139 | ||
140 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
141 | ||
e53639d8 RB |
142 | #ifdef CONFIG_FLATMEM |
143 | ||
144 | #define pfn_valid(pfn) ((pfn) < max_mapnr) | |
145 | ||
7de58fab AN |
146 | #elif defined(CONFIG_SPARSEMEM) |
147 | ||
148 | /* pfn_valid is defined in linux/mmzone.h */ | |
149 | ||
e53639d8 RB |
150 | #elif defined(CONFIG_NEED_MULTIPLE_NODES) |
151 | ||
152 | #define pfn_valid(pfn) \ | |
153 | ({ \ | |
154 | unsigned long __pfn = (pfn); \ | |
155 | int __n = pfn_to_nid(__pfn); \ | |
156 | ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ | |
157 | NODE_DATA(__n)->node_spanned_pages) \ | |
158 | : 0); \ | |
159 | }) | |
160 | ||
e53639d8 RB |
161 | #endif |
162 | ||
1da177e4 LT |
163 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
164 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
165 | ||
166 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
167 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
168 | ||
169 | #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) | |
170 | #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) | |
171 | ||
1da177e4 LT |
172 | #ifdef CONFIG_LIMITED_DMA |
173 | #define WANT_PAGE_VIRTUAL | |
174 | #endif | |
175 | ||
a02036e7 | 176 | #include <asm-generic/memory_model.h> |
fd4fd5aa SR |
177 | #include <asm-generic/page.h> |
178 | ||
a2aa3e23 DW |
179 | #endif /* defined (__KERNEL__) */ |
180 | ||
1da177e4 | 181 | #endif /* _ASM_PAGE_H */ |