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
14 /* PAGE_SHIFT determines the page size */
16 #define PAGE_SIZE (1UL << PAGE_SHIFT)
17 #define PAGE_MASK (~(PAGE_SIZE-1))
21 /* to align the pointer to the (next) page boundary */
22 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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.
36 * We have the following to choose from:
38 * v4wt - ARMv4 with writethrough cache, without minicache
39 * v4wb - ARMv4 with writeback cache, without minicache
40 * 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_XSC3
91 # define _USER xsc3_mc
95 #ifdef CONFIG_CPU_COPY_V6
99 #if !defined(_USER) && !defined(MULTI_USER)
100 #error Unknown user operations model
103 struct cpu_user_fns {
104 void (*cpu_clear_user_page)(void *p, unsigned long user);
105 void (*cpu_copy_user_page)(void *to, const void *from,
110 extern struct cpu_user_fns cpu_user;
112 #define __cpu_clear_user_page cpu_user.cpu_clear_user_page
113 #define __cpu_copy_user_page cpu_user.cpu_copy_user_page
117 #define __cpu_clear_user_page __glue(_USER,_clear_user_page)
118 #define __cpu_copy_user_page __glue(_USER,_copy_user_page)
120 extern void __cpu_clear_user_page(void *p, unsigned long user);
121 extern void __cpu_copy_user_page(void *to, const void *from,
125 #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
126 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
128 #define clear_page(page) memzero((void *)(page), PAGE_SIZE)
129 extern void copy_page(void *to, const void *from);
131 #undef STRICT_MM_TYPECHECKS
133 #ifdef STRICT_MM_TYPECHECKS
135 * These are used to make use of C type-checking..
137 typedef struct { unsigned long pte; } pte_t;
138 typedef struct { unsigned long pmd; } pmd_t;
139 typedef struct { unsigned long pgd[2]; } pgd_t;
140 typedef struct { unsigned long pgprot; } pgprot_t;
142 #define pte_val(x) ((x).pte)
143 #define pmd_val(x) ((x).pmd)
144 #define pgd_val(x) ((x).pgd[0])
145 #define pgprot_val(x) ((x).pgprot)
147 #define __pte(x) ((pte_t) { (x) } )
148 #define __pmd(x) ((pmd_t) { (x) } )
149 #define __pgprot(x) ((pgprot_t) { (x) } )
153 * .. while these make it easier on the compiler
155 typedef unsigned long pte_t;
156 typedef unsigned long pmd_t;
157 typedef unsigned long pgd_t[2];
158 typedef unsigned long pgprot_t;
160 #define pte_val(x) (x)
161 #define pmd_val(x) (x)
162 #define pgd_val(x) ((x)[0])
163 #define pgprot_val(x) (x)
167 #define __pgprot(x) (x)
169 #endif /* STRICT_MM_TYPECHECKS */
171 /* the upper-most page table pointer */
172 extern pmd_t *top_pmd;
174 #include <asm/memory.h>
176 #endif /* !__ASSEMBLY__ */
178 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
179 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
182 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
184 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
185 #define ARCH_SLAB_MINALIGN 8
188 #endif /* __KERNEL__ */
190 #include <asm-generic/page.h>