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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 | 12 | #include <spaces.h> |
99502d94 | 13 | #include <linux/const.h> |
1da177e4 | 14 | |
1da177e4 LT |
15 | /* |
16 | * PAGE_SHIFT determines the page size | |
17 | */ | |
18 | #ifdef CONFIG_PAGE_SIZE_4KB | |
19 | #define PAGE_SHIFT 12 | |
20 | #endif | |
21 | #ifdef CONFIG_PAGE_SIZE_8KB | |
22 | #define PAGE_SHIFT 13 | |
23 | #endif | |
24 | #ifdef CONFIG_PAGE_SIZE_16KB | |
25 | #define PAGE_SHIFT 14 | |
26 | #endif | |
c52399be RB |
27 | #ifdef CONFIG_PAGE_SIZE_32KB |
28 | #define PAGE_SHIFT 15 | |
29 | #endif | |
1da177e4 LT |
30 | #ifdef CONFIG_PAGE_SIZE_64KB |
31 | #define PAGE_SHIFT 16 | |
32 | #endif | |
99502d94 | 33 | #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) |
c17a6554 | 34 | #define PAGE_MASK (~(PAGE_SIZE - 1)) |
1da177e4 | 35 | |
aa1762f4 | 36 | #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT |
dd794392 | 37 | #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) |
99502d94 | 38 | #define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) |
dd794392 DD |
39 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) |
40 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
aa1762f4 | 41 | #else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */ |
f467e4bf HD |
42 | #define HPAGE_SHIFT ({BUILD_BUG(); 0; }) |
43 | #define HPAGE_SIZE ({BUILD_BUG(); 0; }) | |
44 | #define HPAGE_MASK ({BUILD_BUG(); 0; }) | |
45 | #define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; }) | |
aa1762f4 | 46 | #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ |
dd794392 | 47 | |
41b0483e | 48 | #include <linux/pfn.h> |
b1c65b39 | 49 | #include <asm/io.h> |
6f284a2c | 50 | |
c29d1503 DV |
51 | extern void build_clear_page(void); |
52 | extern void build_copy_page(void); | |
53 | ||
6f284a2c FBH |
54 | /* |
55 | * It's normally defined only for FLATMEM config but it's | |
56 | * used in our early mem init code for all memory models. | |
57 | * So always define it. | |
58 | */ | |
59 | #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) | |
60 | ||
1da177e4 LT |
61 | extern void clear_page(void * page); |
62 | extern void copy_page(void * to, void * from); | |
63 | ||
64 | extern unsigned long shm_align_mask; | |
65 | ||
66 | static inline unsigned long pages_do_alias(unsigned long addr1, | |
67 | unsigned long addr2) | |
68 | { | |
69 | return (addr1 ^ addr2) & shm_align_mask; | |
70 | } | |
71 | ||
72 | struct page; | |
73 | ||
74 | static inline void clear_user_page(void *addr, unsigned long vaddr, | |
75 | struct page *page) | |
76 | { | |
77 | extern void (*flush_data_cache_page)(unsigned long addr); | |
78 | ||
79 | clear_page(addr); | |
585fa724 | 80 | if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) |
1da177e4 LT |
81 | flush_data_cache_page((unsigned long)addr); |
82 | } | |
83 | ||
bcd02280 AN |
84 | extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
85 | struct page *to); | |
86 | struct vm_area_struct; | |
87 | extern void copy_user_highpage(struct page *to, struct page *from, | |
88 | unsigned long vaddr, struct vm_area_struct *vma); | |
1da177e4 | 89 | |
bcd02280 | 90 | #define __HAVE_ARCH_COPY_USER_HIGHPAGE |
1da177e4 LT |
91 | |
92 | /* | |
93 | * These are used to make use of C type-checking.. | |
94 | */ | |
95 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
ec917c2c | 96 | #ifdef CONFIG_CPU_MIPS32 |
1da177e4 LT |
97 | typedef struct { unsigned long pte_low, pte_high; } pte_t; |
98 | #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) | |
d34555fb | 99 | #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) |
1da177e4 LT |
100 | #else |
101 | typedef struct { unsigned long long pte; } pte_t; | |
102 | #define pte_val(x) ((x).pte) | |
d34555fb | 103 | #define __pte(x) ((pte_t) { (x) } ) |
1da177e4 LT |
104 | #endif |
105 | #else | |
106 | typedef struct { unsigned long pte; } pte_t; | |
107 | #define pte_val(x) ((x).pte) | |
c6e8b587 | 108 | #define __pte(x) ((pte_t) { (x) } ) |
d34555fb | 109 | #endif |
2f569afd | 110 | typedef struct page *pgtable_t; |
1da177e4 | 111 | |
c6e8b587 RB |
112 | /* |
113 | * Right now we don't support 4-level pagetables, so all pud-related | |
114 | * definitions come from <asm-generic/pgtable-nopud.h>. | |
115 | */ | |
116 | ||
117 | /* | |
118 | * Finall the top of the hierarchy, the pgd | |
119 | */ | |
120 | typedef struct { unsigned long pgd; } pgd_t; | |
121 | #define pgd_val(x) ((x).pgd) | |
1da177e4 | 122 | #define __pgd(x) ((pgd_t) { (x) } ) |
c6e8b587 RB |
123 | |
124 | /* | |
125 | * Manipulate page protection bits | |
126 | */ | |
127 | typedef struct { unsigned long pgprot; } pgprot_t; | |
128 | #define pgprot_val(x) ((x).pgprot) | |
1da177e4 LT |
129 | #define __pgprot(x) ((pgprot_t) { (x) } ) |
130 | ||
c6e8b587 RB |
131 | /* |
132 | * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd | |
133 | * pair of pages we only have a single global bit per pair of pages. When | |
134 | * writing to the TLB make sure we always have the bit set for both pages | |
135 | * or none. This macro is used to access the `buddy' of the pte we're just | |
136 | * working on. | |
137 | */ | |
138 | #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) | |
139 | ||
6f284a2c FBH |
140 | /* |
141 | * __pa()/__va() should be used only during mem init. | |
142 | */ | |
f4fae826 | 143 | #ifdef CONFIG_64BIT |
b1c65b39 FBH |
144 | #define __pa(x) \ |
145 | ({ \ | |
146 | unsigned long __x = (unsigned long)(x); \ | |
147 | __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ | |
148 | }) | |
620a4802 | 149 | #else |
b1c65b39 FBH |
150 | #define __pa(x) \ |
151 | ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) | |
620a4802 | 152 | #endif |
6f284a2c | 153 | #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) |
5707bf6b RB |
154 | |
155 | /* | |
156 | * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad | |
157 | * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The | |
158 | * discussion can be found in lkml posting | |
159 | * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is | |
160 | * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html | |
161 | * | |
162 | * It is unclear if the misscompilations mentioned in | |
163 | * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one | |
164 | * until GCC 3.x has been retired before we can apply | |
165 | * https://patchwork.linux-mips.org/patch/1541/ | |
166 | */ | |
167 | ||
21a151d8 | 168 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
1da177e4 LT |
169 | |
170 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
171 | ||
e53639d8 RB |
172 | #ifdef CONFIG_FLATMEM |
173 | ||
baf92278 RB |
174 | #define pfn_valid(pfn) \ |
175 | ({ \ | |
176 | unsigned long __pfn = (pfn); \ | |
177 | /* avoid <linux/bootmem.h> include hell */ \ | |
178 | extern unsigned long min_low_pfn; \ | |
179 | \ | |
180 | __pfn >= min_low_pfn && __pfn < max_mapnr; \ | |
181 | }) | |
e53639d8 | 182 | |
7de58fab AN |
183 | #elif defined(CONFIG_SPARSEMEM) |
184 | ||
185 | /* pfn_valid is defined in linux/mmzone.h */ | |
186 | ||
e53639d8 RB |
187 | #elif defined(CONFIG_NEED_MULTIPLE_NODES) |
188 | ||
189 | #define pfn_valid(pfn) \ | |
190 | ({ \ | |
191 | unsigned long __pfn = (pfn); \ | |
192 | int __n = pfn_to_nid(__pfn); \ | |
193 | ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ | |
194 | NODE_DATA(__n)->node_spanned_pages) \ | |
195 | : 0); \ | |
196 | }) | |
197 | ||
e53639d8 RB |
198 | #endif |
199 | ||
99e3b942 | 200 | #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) |
d3ce8843 RB |
201 | |
202 | extern int __virt_addr_valid(const volatile void *kaddr); | |
203 | #define virt_addr_valid(kaddr) \ | |
204 | __virt_addr_valid((const volatile void *) (kaddr)) | |
1da177e4 LT |
205 | |
206 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
207 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
208 | ||
86f7d75e FF |
209 | #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE + \ |
210 | PHYS_OFFSET) | |
211 | #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET - \ | |
212 | PHYS_OFFSET) | |
1da177e4 | 213 | |
a02036e7 | 214 | #include <asm-generic/memory_model.h> |
5b17e1cd | 215 | #include <asm-generic/getorder.h> |
fd4fd5aa | 216 | |
1da177e4 | 217 | #endif /* _ASM_PAGE_H */ |