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               (_AC(1,UL) << 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 struct vm_area_struct;
 121
 122 struct cpu_user_fns {
 123         void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 124         void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 125                         unsigned long vaddr, struct vm_area_struct *vma);
 126 };
 127
 128 #ifdef MULTI_USER
 129 extern struct cpu_user_fns cpu_user;
 130
 131 #define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 132 #define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 133
 134 #else
 135
 136 #define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 137 #define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 138
 139 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 140 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 141                         unsigned long vaddr, struct vm_area_struct *vma);
 142 #endif
 143
 144 #define clear_user_highpage(page,vaddr)         \
 145          __cpu_clear_user_highpage(page, vaddr)
 146
 147 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 148 #define copy_user_highpage(to,from,vaddr,vma)   \
 149         __cpu_copy_user_highpage(to, from, vaddr, vma)
 150
 151 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 152 extern void copy_page(void *to, const void *from);
 153
 154 typedef unsigned long pteval_t;
 155
 156 #undef STRICT_MM_TYPECHECKS
 157
 158 #ifdef STRICT_MM_TYPECHECKS
 159 /*
 160  * These are used to make use of C type-checking..
 161  */
 162 typedef struct { pteval_t pte; } pte_t;
 163 typedef struct { unsigned long pmd; } pmd_t;
 164 typedef struct { unsigned long pgd[2]; } pgd_t;
 165 typedef struct { unsigned long pgprot; } pgprot_t;
 166
 167 #define pte_val(x)      ((x).pte)
 168 #define pmd_val(x)      ((x).pmd)
 169 #define pgd_val(x)      ((x).pgd[0])
 170 #define pgprot_val(x)   ((x).pgprot)
 171
 172 #define __pte(x)        ((pte_t) { (x) } )
 173 #define __pmd(x)        ((pmd_t) { (x) } )
 174 #define __pgprot(x)     ((pgprot_t) { (x) } )
 175
 176 #else
 177 /*
 178  * .. while these make it easier on the compiler
 179  */
 180 typedef pteval_t pte_t;
 181 typedef unsigned long pmd_t;
 182 typedef unsigned long pgd_t[2];
 183 typedef unsigned long pgprot_t;
 184
 185 #define pte_val(x)      (x)
 186 #define pmd_val(x)      (x)
 187 #define pgd_val(x)      ((x)[0])
 188 #define pgprot_val(x)   (x)
 189
 190 #define __pte(x)        (x)
 191 #define __pmd(x)        (x)
 192 #define __pgprot(x)     (x)
 193
 194 #endif /* STRICT_MM_TYPECHECKS */
 195
 196 #endif /* CONFIG_MMU */
 197
 198 typedef struct page *pgtable_t;
 199
 200 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 201 extern int pfn_valid(unsigned long);
 202 #endif
 203
 204 #include <asm/memory.h>
 205
 206 #endif /* !__ASSEMBLY__ */
 207
 208 #define VM_DATA_DEFAULT_FLAGS \
 209         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 210          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 211
 212 #include <asm-generic/getorder.h>
 213
 214 #endif