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.
10 #ifndef _ASMARM_PAGE_H
11 #define _ASMARM_PAGE_H
13 #include <linux/config.h>
15 /* PAGE_SHIFT determines the page size */
17 #define PAGE_SIZE (1UL << PAGE_SHIFT)
18 #define PAGE_MASK (~(PAGE_SIZE-1))
22 /* to align the pointer to the (next) page boundary */
23 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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:
39 * v4wt - ARMv4 with writethrough cache, without minicache
40 * v4wb - ARMv4 with writeback cache, without minicache
41 * v4_mc - ARMv4 with minicache
47 #ifdef CONFIG_CPU_COPY_V3
55 #ifdef CONFIG_CPU_COPY_V4WT
63 #ifdef CONFIG_CPU_COPY_V4WB
71 #ifdef CONFIG_CPU_SA1100
79 #ifdef CONFIG_CPU_XSCALE
83 # define _USER xscale_mc
87 #ifdef CONFIG_CPU_COPY_V6
96 #error Unknown user operations model
100 void (*cpu_clear_user_page
)(void *p
, unsigned long user
);
101 void (*cpu_copy_user_page
)(void *to
, const void *from
,
106 extern struct cpu_user_fns cpu_user
;
108 #define __cpu_clear_user_page cpu_user.cpu_clear_user_page
109 #define __cpu_copy_user_page cpu_user.cpu_copy_user_page
113 #define __cpu_clear_user_page __glue(_USER,_clear_user_page)
114 #define __cpu_copy_user_page __glue(_USER,_copy_user_page)
116 extern void __cpu_clear_user_page(void *p
, unsigned long user
);
117 extern void __cpu_copy_user_page(void *to
, const void *from
,
121 #define clear_user_page(addr,vaddr,pg) \
124 __cpu_clear_user_page(addr, vaddr); \
128 #define copy_user_page(to,from,vaddr,pg) \
131 __cpu_copy_user_page(to, from, vaddr); \
135 #define clear_page(page) memzero((void *)(page), PAGE_SIZE)
136 extern void copy_page(void *to
, void *from
);
138 #undef STRICT_MM_TYPECHECKS
140 #ifdef STRICT_MM_TYPECHECKS
142 * These are used to make use of C type-checking..
144 typedef struct { unsigned long pte
; } pte_t
;
145 typedef struct { unsigned long pmd
; } pmd_t
;
146 typedef struct { unsigned long pgd
[2]; } pgd_t
;
147 typedef struct { unsigned long pgprot
; } pgprot_t
;
149 #define pte_val(x) ((x).pte)
150 #define pmd_val(x) ((x).pmd)
151 #define pgd_val(x) ((x).pgd[0])
152 #define pgprot_val(x) ((x).pgprot)
154 #define __pte(x) ((pte_t) { (x) } )
155 #define __pmd(x) ((pmd_t) { (x) } )
156 #define __pgprot(x) ((pgprot_t) { (x) } )
160 * .. while these make it easier on the compiler
162 typedef unsigned long pte_t
;
163 typedef unsigned long pmd_t
;
164 typedef unsigned long pgd_t
[2];
165 typedef unsigned long pgprot_t
;
167 #define pte_val(x) (x)
168 #define pmd_val(x) (x)
169 #define pgd_val(x) ((x)[0])
170 #define pgprot_val(x) (x)
174 #define __pgprot(x) (x)
176 #endif /* STRICT_MM_TYPECHECKS */
178 /* Pure 2^n version of get_order */
179 static inline int get_order(unsigned long size
)
183 size
= (size
-1) >> (PAGE_SHIFT
-1);
192 #include <asm/memory.h>
194 #endif /* !__ASSEMBLY__ */
196 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
197 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
199 #endif /* __KERNEL__ */