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
48 #ifdef CONFIG_CPU_COPY_V3
56 #ifdef CONFIG_CPU_COPY_V4WT
64 #ifdef CONFIG_CPU_COPY_V4WB
72 #ifdef CONFIG_CPU_SA1100
80 #ifdef CONFIG_CPU_XSCALE
84 # define _USER xscale_mc
88 #ifdef CONFIG_CPU_XSC3
92 # define _USER xsc3_mc
96 #ifdef CONFIG_CPU_COPY_V6
100 #if !defined(_USER) && !defined(MULTI_USER)
101 #error Unknown user operations model
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
,
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
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
,
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) } )
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)
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
189 #endif /* __KERNEL__ */
191 #include <asm-generic/page.h>