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[linux-2.6/verdex.git] / include / asm-arm / page.h
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1 /*
2 * linux/include/asm-arm/page.h
4 * Copyright (C) 1995-2003 Russell King
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
13 #include <linux/config.h>
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))
20 #ifdef __KERNEL__
22 /* to align the pointer to the (next) page boundary */
23 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
25 #ifndef __ASSEMBLY__
27 #include <asm/glue.h>
30 * User Space Model
31 * ================
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.
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 * xsc3 - XScalev3
45 #undef _USER
46 #undef MULTI_USER
48 #ifdef CONFIG_CPU_COPY_V3
49 # ifdef _USER
50 # define MULTI_USER 1
51 # else
52 # define _USER v3
53 # endif
54 #endif
56 #ifdef CONFIG_CPU_COPY_V4WT
57 # ifdef _USER
58 # define MULTI_USER 1
59 # else
60 # define _USER v4wt
61 # endif
62 #endif
64 #ifdef CONFIG_CPU_COPY_V4WB
65 # ifdef _USER
66 # define MULTI_USER 1
67 # else
68 # define _USER v4wb
69 # endif
70 #endif
72 #ifdef CONFIG_CPU_SA1100
73 # ifdef _USER
74 # define MULTI_USER 1
75 # else
76 # define _USER v4_mc
77 # endif
78 #endif
80 #ifdef CONFIG_CPU_XSCALE
81 # ifdef _USER
82 # define MULTI_USER 1
83 # else
84 # define _USER xscale_mc
85 # endif
86 #endif
88 #ifdef CONFIG_CPU_XSC3
89 # ifdef _USER
90 # define MULTI_USER 1
91 # else
92 # define _USER xsc3_mc
93 # endif
94 #endif
96 #ifdef CONFIG_CPU_COPY_V6
97 # define MULTI_USER 1
98 #endif
100 #if !defined(_USER) && !defined(MULTI_USER)
101 #error Unknown user operations model
102 #endif
104 struct cpu_user_fns {
105 void (*cpu_clear_user_page)(void *p, unsigned long user);
106 void (*cpu_copy_user_page)(void *to, const void *from,
107 unsigned long user);
110 #ifdef MULTI_USER
111 extern struct cpu_user_fns cpu_user;
113 #define __cpu_clear_user_page cpu_user.cpu_clear_user_page
114 #define __cpu_copy_user_page cpu_user.cpu_copy_user_page
116 #else
118 #define __cpu_clear_user_page __glue(_USER,_clear_user_page)
119 #define __cpu_copy_user_page __glue(_USER,_copy_user_page)
121 extern void __cpu_clear_user_page(void *p, unsigned long user);
122 extern void __cpu_copy_user_page(void *to, const void *from,
123 unsigned long user);
124 #endif
126 #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
127 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
129 #define clear_page(page) memzero((void *)(page), PAGE_SIZE)
130 extern void copy_page(void *to, const void *from);
132 #undef STRICT_MM_TYPECHECKS
134 #ifdef STRICT_MM_TYPECHECKS
136 * These are used to make use of C type-checking..
138 typedef struct { unsigned long pte; } pte_t;
139 typedef struct { unsigned long pmd; } pmd_t;
140 typedef struct { unsigned long pgd[2]; } pgd_t;
141 typedef struct { unsigned long pgprot; } pgprot_t;
143 #define pte_val(x) ((x).pte)
144 #define pmd_val(x) ((x).pmd)
145 #define pgd_val(x) ((x).pgd[0])
146 #define pgprot_val(x) ((x).pgprot)
148 #define __pte(x) ((pte_t) { (x) } )
149 #define __pmd(x) ((pmd_t) { (x) } )
150 #define __pgprot(x) ((pgprot_t) { (x) } )
152 #else
154 * .. while these make it easier on the compiler
156 typedef unsigned long pte_t;
157 typedef unsigned long pmd_t;
158 typedef unsigned long pgd_t[2];
159 typedef unsigned long pgprot_t;
161 #define pte_val(x) (x)
162 #define pmd_val(x) (x)
163 #define pgd_val(x) ((x)[0])
164 #define pgprot_val(x) (x)
166 #define __pte(x) (x)
167 #define __pmd(x) (x)
168 #define __pgprot(x) (x)
170 #endif /* STRICT_MM_TYPECHECKS */
172 /* the upper-most page table pointer */
173 extern pmd_t *top_pmd;
175 #include <asm/memory.h>
177 #endif /* !__ASSEMBLY__ */
179 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
180 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
183 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
185 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
186 #define ARCH_SLAB_MINALIGN 8
187 #endif
189 #endif /* __KERNEL__ */
191 #include <asm-generic/page.h>
193 #endif