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1 /*
2  *  arch/arm/include/asm/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 /* PAGE_SHIFT determines the page size */
14 #define PAGE_SHIFT		12
15 #define PAGE_SIZE		(1UL << PAGE_SHIFT)
16 #define PAGE_MASK		(~(PAGE_SIZE-1))
17 
18 #ifndef __ASSEMBLY__
19 
20 #ifndef CONFIG_MMU
21 
22 #include "page-nommu.h"
23 
24 #else
25 
26 #include <asm/glue.h>
27 
28 /*
29  *	User Space Model
30  *	================
31  *
32  *	This section selects the correct set of functions for dealing with
33  *	page-based copying and clearing for user space for the particular
34  *	processor(s) we're building for.
35  *
36  *	We have the following to choose from:
37  *	  v3		- ARMv3
38  *	  v4wt		- ARMv4 with writethrough cache, without minicache
39  *	  v4wb		- ARMv4 with writeback cache, without minicache
40  *	  v4_mc		- ARMv4 with minicache
41  *	  xscale	- Xscale
42  *	  xsc3		- XScalev3
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_COPY_FEROCEON
72 # ifdef _USER
73 #  define MULTI_USER 1
74 # else
75 #  define _USER feroceon
76 # endif
77 #endif
78 
79 #ifdef CONFIG_CPU_SA1100
80 # ifdef _USER
81 #  define MULTI_USER 1
82 # else
83 #  define _USER v4_mc
84 # endif
85 #endif
86 
87 #ifdef CONFIG_CPU_XSCALE
88 # ifdef _USER
89 #  define MULTI_USER 1
90 # else
91 #  define _USER xscale_mc
92 # endif
93 #endif
94 
95 #ifdef CONFIG_CPU_XSC3
96 # ifdef _USER
97 #  define MULTI_USER 1
98 # else
99 #  define _USER xsc3_mc
100 # endif
101 #endif
102 
103 #ifdef CONFIG_CPU_COPY_V6
104 # define MULTI_USER 1
105 #endif
106 
107 #if !defined(_USER) && !defined(MULTI_USER)
108 #error Unknown user operations model
109 #endif
110 
111 struct page;
112 
113 struct cpu_user_fns {
114 	void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
115 	void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
116 			unsigned long vaddr);
117 };
118 
119 #ifdef MULTI_USER
120 extern struct cpu_user_fns cpu_user;
121 
122 #define __cpu_clear_user_highpage	cpu_user.cpu_clear_user_highpage
123 #define __cpu_copy_user_highpage	cpu_user.cpu_copy_user_highpage
124 
125 #else
126 
127 #define __cpu_clear_user_highpage	__glue(_USER,_clear_user_highpage)
128 #define __cpu_copy_user_highpage	__glue(_USER,_copy_user_highpage)
129 
130 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
131 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
132 			unsigned long vaddr);
133 #endif
134 
135 #define clear_user_highpage(page,vaddr)		\
136 	 __cpu_clear_user_highpage(page, vaddr)
137 
138 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
139 #define copy_user_highpage(to,from,vaddr,vma)	\
140 	__cpu_copy_user_highpage(to, from, vaddr)
141 
142 #define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
143 extern void copy_page(void *to, const void *from);
144 
145 #undef STRICT_MM_TYPECHECKS
146 
147 #ifdef STRICT_MM_TYPECHECKS
148 /*
149  * These are used to make use of C type-checking..
150  */
151 typedef struct { unsigned long pte; } pte_t;
152 typedef struct { unsigned long pmd; } pmd_t;
153 typedef struct { unsigned long pgd[2]; } pgd_t;
154 typedef struct { unsigned long pgprot; } pgprot_t;
155 
156 #define pte_val(x)      ((x).pte)
157 #define pmd_val(x)      ((x).pmd)
158 #define pgd_val(x)	((x).pgd[0])
159 #define pgprot_val(x)   ((x).pgprot)
160 
161 #define __pte(x)        ((pte_t) { (x) } )
162 #define __pmd(x)        ((pmd_t) { (x) } )
163 #define __pgprot(x)     ((pgprot_t) { (x) } )
164 
165 #else
166 /*
167  * .. while these make it easier on the compiler
168  */
169 typedef unsigned long pte_t;
170 typedef unsigned long pmd_t;
171 typedef unsigned long pgd_t[2];
172 typedef unsigned long pgprot_t;
173 
174 #define pte_val(x)      (x)
175 #define pmd_val(x)      (x)
176 #define pgd_val(x)	((x)[0])
177 #define pgprot_val(x)   (x)
178 
179 #define __pte(x)        (x)
180 #define __pmd(x)        (x)
181 #define __pgprot(x)     (x)
182 
183 #endif /* STRICT_MM_TYPECHECKS */
184 
185 #endif /* CONFIG_MMU */
186 
187 typedef struct page *pgtable_t;
188 
189 #include <asm/memory.h>
190 
191 #endif /* !__ASSEMBLY__ */
192 
193 #define VM_DATA_DEFAULT_FLAGS \
194 	(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
195 	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
196 
197 #include <asm-generic/page.h>
198 
199 #endif
200