include/asm-arm/page.h

   1 /*
   2  *  linux/include/asm-arm/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 /* to align the pointer to the (next) page boundary */
  19 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  20
  21 #ifndef __ASSEMBLY__
  22
  23 #ifndef CONFIG_MMU
  24
  25 #include "page-nommu.h"
  26
  27 #else
  28
  29 #include <asm/glue.h>
  30
  31 /*
  32  *      User Space Model
  33  *      ================
  34  *
  35  *      This section selects the correct set of functions for dealing with
  36  *      page-based copying and clearing for user space for the particular
  37  *      processor(s) we're building for.
  38  *
  39  *      We have the following to choose from:
  40  *        v3            - ARMv3
  41  *        v4wt          - ARMv4 with writethrough cache, without minicache
  42  *        v4wb          - ARMv4 with writeback cache, without minicache
  43  *        v4_mc         - ARMv4 with minicache
  44  *        xscale        - Xscale
  45  *        xsc3          - XScalev3
  46  */
  47 #undef _USER
  48 #undef MULTI_USER
  49
  50 #ifdef CONFIG_CPU_COPY_V3
  51 # ifdef _USER
  52 #  define MULTI_USER 1
  53 # else
  54 #  define _USER v3
  55 # endif
  56 #endif
  57
  58 #ifdef CONFIG_CPU_COPY_V4WT
  59 # ifdef _USER
  60 #  define MULTI_USER 1
  61 # else
  62 #  define _USER v4wt
  63 # endif
  64 #endif
  65
  66 #ifdef CONFIG_CPU_COPY_V4WB
  67 # ifdef _USER
  68 #  define MULTI_USER 1
  69 # else
  70 #  define _USER v4wb
  71 # endif
  72 #endif
  73
  74 #ifdef CONFIG_CPU_COPY_FEROCEON
  75 # ifdef _USER
  76 #  define MULTI_USER 1
  77 # else
  78 #  define _USER feroceon
  79 # endif
  80 #endif
  81
  82 #ifdef CONFIG_CPU_SA1100
  83 # ifdef _USER
  84 #  define MULTI_USER 1
  85 # else
  86 #  define _USER v4_mc
  87 # endif
  88 #endif
  89
  90 #ifdef CONFIG_CPU_XSCALE
  91 # ifdef _USER
  92 #  define MULTI_USER 1
  93 # else
  94 #  define _USER xscale_mc
  95 # endif
  96 #endif
  97
  98 #ifdef CONFIG_CPU_XSC3
  99 # ifdef _USER
 100 #  define MULTI_USER 1
 101 # else
 102 #  define _USER xsc3_mc
 103 # endif
 104 #endif
 105
 106 #ifdef CONFIG_CPU_COPY_V6
 107 # define MULTI_USER 1
 108 #endif
 109
 110 #if !defined(_USER) && !defined(MULTI_USER)
 111 #error Unknown user operations model
 112 #endif
 113
 114 struct cpu_user_fns {
 115         void (*cpu_clear_user_page)(void *p, unsigned long user);
 116         void (*cpu_copy_user_page)(void *to, const void *from,
 117                                    unsigned long user);
 118 };
 119
 120 #ifdef MULTI_USER
 121 extern struct cpu_user_fns cpu_user;
 122
 123 #define __cpu_clear_user_page   cpu_user.cpu_clear_user_page
 124 #define __cpu_copy_user_page    cpu_user.cpu_copy_user_page
 125
 126 #else
 127
 128 #define __cpu_clear_user_page   __glue(_USER,_clear_user_page)
 129 #define __cpu_copy_user_page    __glue(_USER,_copy_user_page)
 130
 131 extern void __cpu_clear_user_page(void *p, unsigned long user);
 132 extern void __cpu_copy_user_page(void *to, const void *from,
 133                                  unsigned long user);
 134 #endif
 135
 136 #define clear_user_page(addr,vaddr,pg)   __cpu_clear_user_page(addr, vaddr)
 137 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
 138
 139 #define clear_page(page)        memzero((void *)(page), PAGE_SIZE)
 140 extern void copy_page(void *to, const void *from);
 141
 142 #undef STRICT_MM_TYPECHECKS
 143
 144 #ifdef STRICT_MM_TYPECHECKS
 145 /*
 146  * These are used to make use of C type-checking..
 147  */
 148 typedef struct { unsigned long pte; } pte_t;
 149 typedef struct { unsigned long pmd; } pmd_t;
 150 typedef struct { unsigned long pgd[2]; } pgd_t;
 151 typedef struct { unsigned long pgprot; } pgprot_t;
 152
 153 #define pte_val(x)      ((x).pte)
 154 #define pmd_val(x)      ((x).pmd)
 155 #define pgd_val(x)      ((x).pgd[0])
 156 #define pgprot_val(x)   ((x).pgprot)
 157
 158 #define __pte(x)        ((pte_t) { (x) } )
 159 #define __pmd(x)        ((pmd_t) { (x) } )
 160 #define __pgprot(x)     ((pgprot_t) { (x) } )
 161
 162 #else
 163 /*
 164  * .. while these make it easier on the compiler
 165  */
 166 typedef unsigned long pte_t;
 167 typedef unsigned long pmd_t;
 168 typedef unsigned long pgd_t[2];
 169 typedef unsigned long pgprot_t;
 170
 171 #define pte_val(x)      (x)
 172 #define pmd_val(x)      (x)
 173 #define pgd_val(x)      ((x)[0])
 174 #define pgprot_val(x)   (x)
 175
 176 #define __pte(x)        (x)
 177 #define __pmd(x)        (x)
 178 #define __pgprot(x)     (x)
 179
 180 #endif /* STRICT_MM_TYPECHECKS */
 181
 182 #endif /* CONFIG_MMU */
 183
 184 typedef struct page *pgtable_t;
 185
 186 #include <asm/memory.h>
 187
 188 #endif /* !__ASSEMBLY__ */
 189
 190 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 191                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 192
 193 /*
 194  * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
 195  */
 196 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
 197 #define ARCH_SLAB_MINALIGN 8
 198 #endif
 199
 200 #include <asm-generic/page.h>
 201
 202 #endif