arch/arm/include/asm/page.h

   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_COPY_FA
  80 # ifdef _USER
  81 #  define MULTI_USER 1
  82 # else
  83 #  define _USER fa
  84 # endif
  85 #endif
  86
  87 #ifdef CONFIG_CPU_SA1100
  88 # ifdef _USER
  89 #  define MULTI_USER 1
  90 # else
  91 #  define _USER v4_mc
  92 # endif
  93 #endif
  94
  95 #ifdef CONFIG_CPU_XSCALE
  96 # ifdef _USER
  97 #  define MULTI_USER 1
  98 # else
  99 #  define _USER xscale_mc
 100 # endif
 101 #endif
 102
 103 #ifdef CONFIG_CPU_XSC3
 104 # ifdef _USER
 105 #  define MULTI_USER 1
 106 # else
 107 #  define _USER xsc3_mc
 108 # endif
 109 #endif
 110
 111 #ifdef CONFIG_CPU_COPY_V6
 112 # define MULTI_USER 1
 113 #endif
 114
 115 #if !defined(_USER) && !defined(MULTI_USER)
 116 #error Unknown user operations model
 117 #endif
 118
 119 struct page;
 120
 121 struct cpu_user_fns {
 122         void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 123         void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 124                         unsigned long vaddr);
 125 };
 126
 127 #ifdef MULTI_USER
 128 extern struct cpu_user_fns cpu_user;
 129
 130 #define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 131 #define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 132
 133 #else
 134
 135 #define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 136 #define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 137
 138 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 139 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 140                         unsigned long vaddr);
 141 #endif
 142
 143 #define clear_user_highpage(page,vaddr)         \
 144          __cpu_clear_user_highpage(page, vaddr)
 145
 146 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 147 #define copy_user_highpage(to,from,vaddr,vma)   \
 148         __cpu_copy_user_highpage(to, from, vaddr)
 149
 150 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 151 extern void copy_page(void *to, const void *from);
 152
 153 #undef STRICT_MM_TYPECHECKS
 154
 155 #ifdef STRICT_MM_TYPECHECKS
 156 /*
 157  * These are used to make use of C type-checking..
 158  */
 159 typedef struct { unsigned long pte; } pte_t;
 160 typedef struct { unsigned long pmd; } pmd_t;
 161 typedef struct { unsigned long pgd[2]; } pgd_t;
 162 typedef struct { unsigned long pgprot; } pgprot_t;
 163
 164 #define pte_val(x)      ((x).pte)
 165 #define pmd_val(x)      ((x).pmd)
 166 #define pgd_val(x)      ((x).pgd[0])
 167 #define pgprot_val(x)   ((x).pgprot)
 168
 169 #define __pte(x)        ((pte_t) { (x) } )
 170 #define __pmd(x)        ((pmd_t) { (x) } )
 171 #define __pgprot(x)     ((pgprot_t) { (x) } )
 172
 173 #else
 174 /*
 175  * .. while these make it easier on the compiler
 176  */
 177 typedef unsigned long pte_t;
 178 typedef unsigned long pmd_t;
 179 typedef unsigned long pgd_t[2];
 180 typedef unsigned long pgprot_t;
 181
 182 #define pte_val(x)      (x)
 183 #define pmd_val(x)      (x)
 184 #define pgd_val(x)      ((x)[0])
 185 #define pgprot_val(x)   (x)
 186
 187 #define __pte(x)        (x)
 188 #define __pmd(x)        (x)
 189 #define __pgprot(x)     (x)
 190
 191 #endif /* STRICT_MM_TYPECHECKS */
 192
 193 #endif /* CONFIG_MMU */
 194
 195 typedef struct page *pgtable_t;
 196
 197 #include <asm/memory.h>
 198
 199 #endif /* !__ASSEMBLY__ */
 200
 201 #define VM_DATA_DEFAULT_FLAGS \
 202         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 203          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 204
 205 /*
 206  * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
 207  */
 208 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
 209 #define ARCH_SLAB_MINALIGN 8
 210 #endif
 211
 212 #include <asm-generic/page.h>
 213
 214 #endif