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_SA1100
  80 # ifdef _USER
  81 #  define MULTI_USER 1
  82 # else
  83 #  define _USER v4_mc
  84 # endif
  85 #endif
  86
  87 #ifdef CONFIG_CPU_XSCALE
  88 # ifdef _USER
  89 #  define MULTI_USER 1
  90 # else
  91 #  define _USER xscale_mc
  92 # endif
  93 #endif
  94
  95 #ifdef CONFIG_CPU_XSC3
  96 # ifdef _USER
  97 #  define MULTI_USER 1
  98 # else
  99 #  define _USER xsc3_mc
 100 # endif
 101 #endif
 102
 103 #ifdef CONFIG_CPU_COPY_V6
 104 # define MULTI_USER 1
 105 #endif
 106
 107 #if !defined(_USER) && !defined(MULTI_USER)
 108 #error Unknown user operations model
 109 #endif
 110
 111 struct cpu_user_fns {
 112         void (*cpu_clear_user_page)(void *p, unsigned long user);
 113         void (*cpu_copy_user_page)(void *to, const void *from,
 114                                    unsigned long user);
 115 };
 116
 117 #ifdef MULTI_USER
 118 extern struct cpu_user_fns cpu_user;
 119
 120 #define __cpu_clear_user_page   cpu_user.cpu_clear_user_page
 121 #define __cpu_copy_user_page    cpu_user.cpu_copy_user_page
 122
 123 #else
 124
 125 #define __cpu_clear_user_page   __glue(_USER,_clear_user_page)
 126 #define __cpu_copy_user_page    __glue(_USER,_copy_user_page)
 127
 128 extern void __cpu_clear_user_page(void *p, unsigned long user);
 129 extern void __cpu_copy_user_page(void *to, const void *from,
 130                                  unsigned long user);
 131 #endif
 132
 133 #define clear_user_page(addr,vaddr,pg)   __cpu_clear_user_page(addr, vaddr)
 134 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
 135
 136 #define clear_page(page)        memzero((void *)(page), PAGE_SIZE)
 137 extern void copy_page(void *to, const void *from);
 138
 139 #undef STRICT_MM_TYPECHECKS
 140
 141 #ifdef STRICT_MM_TYPECHECKS
 142 /*
 143  * These are used to make use of C type-checking..
 144  */
 145 typedef struct { unsigned long pte; } pte_t;
 146 typedef struct { unsigned long pmd; } pmd_t;
 147 typedef struct { unsigned long pgd[2]; } pgd_t;
 148 typedef struct { unsigned long pgprot; } pgprot_t;
 149
 150 #define pte_val(x)      ((x).pte)
 151 #define pmd_val(x)      ((x).pmd)
 152 #define pgd_val(x)      ((x).pgd[0])
 153 #define pgprot_val(x)   ((x).pgprot)
 154
 155 #define __pte(x)        ((pte_t) { (x) } )
 156 #define __pmd(x)        ((pmd_t) { (x) } )
 157 #define __pgprot(x)     ((pgprot_t) { (x) } )
 158
 159 #else
 160 /*
 161  * .. while these make it easier on the compiler
 162  */
 163 typedef unsigned long pte_t;
 164 typedef unsigned long pmd_t;
 165 typedef unsigned long pgd_t[2];
 166 typedef unsigned long pgprot_t;
 167
 168 #define pte_val(x)      (x)
 169 #define pmd_val(x)      (x)
 170 #define pgd_val(x)      ((x)[0])
 171 #define pgprot_val(x)   (x)
 172
 173 #define __pte(x)        (x)
 174 #define __pmd(x)        (x)
 175 #define __pgprot(x)     (x)
 176
 177 #endif /* STRICT_MM_TYPECHECKS */
 178
 179 #endif /* CONFIG_MMU */
 180
 181 typedef struct page *pgtable_t;
 182
 183 #include <asm/memory.h>
 184
 185 #endif /* !__ASSEMBLY__ */
 186
 187 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 188                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 189
 190 /*
 191  * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
 192  */
 193 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
 194 #define ARCH_SLAB_MINALIGN 8
 195 #endif
 196
 197 #include <asm-generic/page.h>
 198
 199 #endif