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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/page.h | |
3 | * | |
4 | * Copyright (C) 1995-2003 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #ifndef _ASMARM_PAGE_H | |
11 | #define _ASMARM_PAGE_H | |
12 | ||
13 | #include <linux/config.h> | |
14 | ||
15 | /* PAGE_SHIFT determines the page size */ | |
16 | #define PAGE_SHIFT 12 | |
17 | #define PAGE_SIZE (1UL << PAGE_SHIFT) | |
18 | #define PAGE_MASK (~(PAGE_SIZE-1)) | |
19 | ||
20 | #ifdef __KERNEL__ | |
21 | ||
22 | /* to align the pointer to the (next) page boundary */ | |
23 | #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) | |
24 | ||
25 | #ifndef __ASSEMBLY__ | |
26 | ||
27 | #include <asm/glue.h> | |
28 | ||
29 | /* | |
30 | * User Space Model | |
31 | * ================ | |
32 | * | |
33 | * This section selects the correct set of functions for dealing with | |
34 | * page-based copying and clearing for user space for the particular | |
35 | * processor(s) we're building for. | |
36 | * | |
37 | * We have the following to choose from: | |
38 | * v3 - ARMv3 | |
39 | * v4wt - ARMv4 with writethrough cache, without minicache | |
40 | * v4wb - ARMv4 with writeback cache, without minicache | |
41 | * v4_mc - ARMv4 with minicache | |
42 | * xscale - Xscale | |
43 | */ | |
44 | #undef _USER | |
45 | #undef MULTI_USER | |
46 | ||
47 | #ifdef CONFIG_CPU_COPY_V3 | |
48 | # ifdef _USER | |
49 | # define MULTI_USER 1 | |
50 | # else | |
51 | # define _USER v3 | |
52 | # endif | |
53 | #endif | |
54 | ||
55 | #ifdef CONFIG_CPU_COPY_V4WT | |
56 | # ifdef _USER | |
57 | # define MULTI_USER 1 | |
58 | # else | |
59 | # define _USER v4wt | |
60 | # endif | |
61 | #endif | |
62 | ||
63 | #ifdef CONFIG_CPU_COPY_V4WB | |
64 | # ifdef _USER | |
65 | # define MULTI_USER 1 | |
66 | # else | |
67 | # define _USER v4wb | |
68 | # endif | |
69 | #endif | |
70 | ||
71 | #ifdef CONFIG_CPU_SA1100 | |
72 | # ifdef _USER | |
73 | # define MULTI_USER 1 | |
74 | # else | |
75 | # define _USER v4_mc | |
76 | # endif | |
77 | #endif | |
78 | ||
79 | #ifdef CONFIG_CPU_XSCALE | |
80 | # ifdef _USER | |
81 | # define MULTI_USER 1 | |
82 | # else | |
83 | # define _USER xscale_mc | |
84 | # endif | |
85 | #endif | |
86 | ||
87 | #ifdef CONFIG_CPU_COPY_V6 | |
88 | # define MULTI_USER 1 | |
89 | #endif | |
90 | ||
91 | #if !defined(_USER) && !defined(MULTI_USER) | |
92 | #error Unknown user operations model | |
93 | #endif | |
94 | ||
95 | struct cpu_user_fns { | |
96 | void (*cpu_clear_user_page)(void *p, unsigned long user); | |
97 | void (*cpu_copy_user_page)(void *to, const void *from, | |
98 | unsigned long user); | |
99 | }; | |
100 | ||
101 | #ifdef MULTI_USER | |
102 | extern struct cpu_user_fns cpu_user; | |
103 | ||
104 | #define __cpu_clear_user_page cpu_user.cpu_clear_user_page | |
105 | #define __cpu_copy_user_page cpu_user.cpu_copy_user_page | |
106 | ||
107 | #else | |
108 | ||
109 | #define __cpu_clear_user_page __glue(_USER,_clear_user_page) | |
110 | #define __cpu_copy_user_page __glue(_USER,_copy_user_page) | |
111 | ||
112 | extern void __cpu_clear_user_page(void *p, unsigned long user); | |
113 | extern void __cpu_copy_user_page(void *to, const void *from, | |
114 | unsigned long user); | |
115 | #endif | |
116 | ||
d2bab05a RK |
117 | #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr) |
118 | #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr) | |
1da177e4 LT |
119 | |
120 | #define clear_page(page) memzero((void *)(page), PAGE_SIZE) | |
121 | extern void copy_page(void *to, const void *from); | |
122 | ||
123 | #undef STRICT_MM_TYPECHECKS | |
124 | ||
125 | #ifdef STRICT_MM_TYPECHECKS | |
126 | /* | |
127 | * These are used to make use of C type-checking.. | |
128 | */ | |
129 | typedef struct { unsigned long pte; } pte_t; | |
130 | typedef struct { unsigned long pmd; } pmd_t; | |
131 | typedef struct { unsigned long pgd[2]; } pgd_t; | |
132 | typedef struct { unsigned long pgprot; } pgprot_t; | |
133 | ||
134 | #define pte_val(x) ((x).pte) | |
135 | #define pmd_val(x) ((x).pmd) | |
136 | #define pgd_val(x) ((x).pgd[0]) | |
137 | #define pgprot_val(x) ((x).pgprot) | |
138 | ||
139 | #define __pte(x) ((pte_t) { (x) } ) | |
140 | #define __pmd(x) ((pmd_t) { (x) } ) | |
141 | #define __pgprot(x) ((pgprot_t) { (x) } ) | |
142 | ||
143 | #else | |
144 | /* | |
145 | * .. while these make it easier on the compiler | |
146 | */ | |
147 | typedef unsigned long pte_t; | |
148 | typedef unsigned long pmd_t; | |
149 | typedef unsigned long pgd_t[2]; | |
150 | typedef unsigned long pgprot_t; | |
151 | ||
152 | #define pte_val(x) (x) | |
153 | #define pmd_val(x) (x) | |
154 | #define pgd_val(x) ((x)[0]) | |
155 | #define pgprot_val(x) (x) | |
156 | ||
157 | #define __pte(x) (x) | |
158 | #define __pmd(x) (x) | |
159 | #define __pgprot(x) (x) | |
160 | ||
161 | #endif /* STRICT_MM_TYPECHECKS */ | |
162 | ||
c4e1f6f6 RK |
163 | /* the upper-most page table pointer */ |
164 | extern pmd_t *top_pmd; | |
165 | ||
1da177e4 LT |
166 | #include <asm/memory.h> |
167 | ||
168 | #endif /* !__ASSEMBLY__ */ | |
169 | ||
170 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
171 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
172 | ||
173 | #endif /* __KERNEL__ */ | |
174 | ||
fd4fd5aa SR |
175 | #include <asm-generic/page.h> |
176 | ||
1da177e4 | 177 | #endif |