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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 | #include <spaces.h> |
13 | ||
1da177e4 LT |
14 | /* |
15 | * PAGE_SHIFT determines the page size | |
16 | */ | |
17 | #ifdef CONFIG_PAGE_SIZE_4KB | |
18 | #define PAGE_SHIFT 12 | |
19 | #endif | |
20 | #ifdef CONFIG_PAGE_SIZE_8KB | |
21 | #define PAGE_SHIFT 13 | |
22 | #endif | |
23 | #ifdef CONFIG_PAGE_SIZE_16KB | |
24 | #define PAGE_SHIFT 14 | |
25 | #endif | |
c52399be RB |
26 | #ifdef CONFIG_PAGE_SIZE_32KB |
27 | #define PAGE_SHIFT 15 | |
28 | #endif | |
1da177e4 LT |
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 | ||
dd794392 DD |
35 | #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) |
36 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) | |
37 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
38 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
39 | ||
1da177e4 LT |
40 | #ifndef __ASSEMBLY__ |
41 | ||
41b0483e | 42 | #include <linux/pfn.h> |
b1c65b39 | 43 | #include <asm/io.h> |
6f284a2c | 44 | |
c29d1503 DV |
45 | extern void build_clear_page(void); |
46 | extern void build_copy_page(void); | |
47 | ||
6f284a2c FBH |
48 | /* |
49 | * It's normally defined only for FLATMEM config but it's | |
50 | * used in our early mem init code for all memory models. | |
51 | * So always define it. | |
52 | */ | |
53 | #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) | |
54 | ||
1da177e4 LT |
55 | extern void clear_page(void * page); |
56 | extern void copy_page(void * to, void * from); | |
57 | ||
58 | extern unsigned long shm_align_mask; | |
59 | ||
60 | static inline unsigned long pages_do_alias(unsigned long addr1, | |
61 | unsigned long addr2) | |
62 | { | |
63 | return (addr1 ^ addr2) & shm_align_mask; | |
64 | } | |
65 | ||
66 | struct page; | |
67 | ||
68 | static inline void clear_user_page(void *addr, unsigned long vaddr, | |
69 | struct page *page) | |
70 | { | |
71 | extern void (*flush_data_cache_page)(unsigned long addr); | |
72 | ||
73 | clear_page(addr); | |
585fa724 | 74 | if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) |
1da177e4 LT |
75 | flush_data_cache_page((unsigned long)addr); |
76 | } | |
77 | ||
bcd02280 AN |
78 | extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
79 | struct page *to); | |
80 | struct vm_area_struct; | |
81 | extern void copy_user_highpage(struct page *to, struct page *from, | |
82 | unsigned long vaddr, struct vm_area_struct *vma); | |
1da177e4 | 83 | |
bcd02280 | 84 | #define __HAVE_ARCH_COPY_USER_HIGHPAGE |
1da177e4 LT |
85 | |
86 | /* | |
87 | * These are used to make use of C type-checking.. | |
88 | */ | |
89 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
ec917c2c | 90 | #ifdef CONFIG_CPU_MIPS32 |
1da177e4 LT |
91 | typedef struct { unsigned long pte_low, pte_high; } pte_t; |
92 | #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) | |
d34555fb | 93 | #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) |
1da177e4 LT |
94 | #else |
95 | typedef struct { unsigned long long pte; } pte_t; | |
96 | #define pte_val(x) ((x).pte) | |
d34555fb | 97 | #define __pte(x) ((pte_t) { (x) } ) |
1da177e4 LT |
98 | #endif |
99 | #else | |
100 | typedef struct { unsigned long pte; } pte_t; | |
101 | #define pte_val(x) ((x).pte) | |
c6e8b587 | 102 | #define __pte(x) ((pte_t) { (x) } ) |
d34555fb | 103 | #endif |
2f569afd | 104 | typedef struct page *pgtable_t; |
1da177e4 | 105 | |
c6e8b587 RB |
106 | /* |
107 | * For 3-level pagetables we defines these ourselves, for 2-level the | |
108 | * definitions are supplied by <asm-generic/pgtable-nopmd.h>. | |
109 | */ | |
110 | #ifdef CONFIG_64BIT | |
1da177e4 | 111 | |
c6e8b587 | 112 | typedef struct { unsigned long pmd; } pmd_t; |
1da177e4 | 113 | #define pmd_val(x) ((x).pmd) |
c6e8b587 | 114 | #define __pmd(x) ((pmd_t) { (x) } ) |
1da177e4 | 115 | |
c6e8b587 | 116 | #endif |
1da177e4 | 117 | |
c6e8b587 RB |
118 | /* |
119 | * Right now we don't support 4-level pagetables, so all pud-related | |
120 | * definitions come from <asm-generic/pgtable-nopud.h>. | |
121 | */ | |
122 | ||
123 | /* | |
124 | * Finall the top of the hierarchy, the pgd | |
125 | */ | |
126 | typedef struct { unsigned long pgd; } pgd_t; | |
127 | #define pgd_val(x) ((x).pgd) | |
1da177e4 | 128 | #define __pgd(x) ((pgd_t) { (x) } ) |
c6e8b587 RB |
129 | |
130 | /* | |
131 | * Manipulate page protection bits | |
132 | */ | |
133 | typedef struct { unsigned long pgprot; } pgprot_t; | |
134 | #define pgprot_val(x) ((x).pgprot) | |
1da177e4 LT |
135 | #define __pgprot(x) ((pgprot_t) { (x) } ) |
136 | ||
c6e8b587 RB |
137 | /* |
138 | * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd | |
139 | * pair of pages we only have a single global bit per pair of pages. When | |
140 | * writing to the TLB make sure we always have the bit set for both pages | |
141 | * or none. This macro is used to access the `buddy' of the pte we're just | |
142 | * working on. | |
143 | */ | |
144 | #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) | |
145 | ||
1da177e4 LT |
146 | #endif /* !__ASSEMBLY__ */ |
147 | ||
6f284a2c FBH |
148 | /* |
149 | * __pa()/__va() should be used only during mem init. | |
150 | */ | |
f4fae826 | 151 | #ifdef CONFIG_64BIT |
b1c65b39 FBH |
152 | #define __pa(x) \ |
153 | ({ \ | |
154 | unsigned long __x = (unsigned long)(x); \ | |
155 | __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ | |
156 | }) | |
620a4802 | 157 | #else |
b1c65b39 FBH |
158 | #define __pa(x) \ |
159 | ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) | |
620a4802 | 160 | #endif |
6f284a2c | 161 | #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) |
21a151d8 | 162 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
1da177e4 LT |
163 | |
164 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
165 | ||
e53639d8 RB |
166 | #ifdef CONFIG_FLATMEM |
167 | ||
baf92278 RB |
168 | #define pfn_valid(pfn) \ |
169 | ({ \ | |
170 | unsigned long __pfn = (pfn); \ | |
171 | /* avoid <linux/bootmem.h> include hell */ \ | |
172 | extern unsigned long min_low_pfn; \ | |
173 | \ | |
174 | __pfn >= min_low_pfn && __pfn < max_mapnr; \ | |
175 | }) | |
e53639d8 | 176 | |
7de58fab AN |
177 | #elif defined(CONFIG_SPARSEMEM) |
178 | ||
179 | /* pfn_valid is defined in linux/mmzone.h */ | |
180 | ||
e53639d8 RB |
181 | #elif defined(CONFIG_NEED_MULTIPLE_NODES) |
182 | ||
183 | #define pfn_valid(pfn) \ | |
184 | ({ \ | |
185 | unsigned long __pfn = (pfn); \ | |
186 | int __n = pfn_to_nid(__pfn); \ | |
187 | ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ | |
188 | NODE_DATA(__n)->node_spanned_pages) \ | |
189 | : 0); \ | |
190 | }) | |
191 | ||
e53639d8 RB |
192 | #endif |
193 | ||
99e3b942 FBH |
194 | #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) |
195 | #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) | |
1da177e4 LT |
196 | |
197 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
198 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
199 | ||
200 | #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) | |
201 | #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) | |
202 | ||
a02036e7 | 203 | #include <asm-generic/memory_model.h> |
5b17e1cd | 204 | #include <asm-generic/getorder.h> |
fd4fd5aa | 205 | |
1da177e4 | 206 | #endif /* _ASM_PAGE_H */ |