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
  14 /* PAGE_SHIFT determines the page size */
  15 #define PAGE_SHIFT              12
  16 #define PAGE_SIZE               (1UL << PAGE_SHIFT)
  17 #define PAGE_MASK               (~(PAGE_SIZE-1))
  18
  19 #ifdef __KERNEL__
  20
  21 /* to align the pointer to the (next) page boundary */
  22 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  23
  24 #ifndef __ASSEMBLY__
  25
  26 #ifndef CONFIG_MMU
  27
  28 #include "page-nommu.h"
  29
  30 #else
  31
  32 #include <asm/glue.h>
  33
  34 /*
  35  *      User Space Model
  36  *      ================
  37  *
  38  *      This section selects the correct set of functions for dealing with
  39  *      page-based copying and clearing for user space for the particular
  40  *      processor(s) we're building for.
  41  *
  42  *      We have the following to choose from:
  43  *        v3            - ARMv3
  44  *        v4wt          - ARMv4 with writethrough cache, without minicache
  45  *        v4wb          - ARMv4 with writeback cache, without minicache
  46  *        v4_mc         - ARMv4 with minicache
  47  *        xscale        - Xscale
  48  *        xsc3          - XScalev3
  49  */
  50 #undef _USER
  51 #undef MULTI_USER
  52
  53 #ifdef CONFIG_CPU_COPY_V3
  54 # ifdef _USER
  55 #  define MULTI_USER 1
  56 # else
  57 #  define _USER v3
  58 # endif
  59 #endif
  60
  61 #ifdef CONFIG_CPU_COPY_V4WT
  62 # ifdef _USER
  63 #  define MULTI_USER 1
  64 # else
  65 #  define _USER v4wt
  66 # endif
  67 #endif
  68
  69 #ifdef CONFIG_CPU_COPY_V4WB
  70 # ifdef _USER
  71 #  define MULTI_USER 1
  72 # else
  73 #  define _USER v4wb
  74 # endif
  75 #endif
  76
  77 #ifdef CONFIG_CPU_SA1100
  78 # ifdef _USER
  79 #  define MULTI_USER 1
  80 # else
  81 #  define _USER v4_mc
  82 # endif
  83 #endif
  84
  85 #ifdef CONFIG_CPU_XSCALE
  86 # ifdef _USER
  87 #  define MULTI_USER 1
  88 # else
  89 #  define _USER xscale_mc
  90 # endif
  91 #endif
  92
  93 #ifdef CONFIG_CPU_XSC3
  94 # ifdef _USER
  95 #  define MULTI_USER 1
  96 # else
  97 #  define _USER xsc3_mc
  98 # endif
  99 #endif
 100
 101 #ifdef CONFIG_CPU_COPY_V6
 102 # define MULTI_USER 1
 103 #endif
 104
 105 #if !defined(_USER) && !defined(MULTI_USER)
 106 #error Unknown user operations model
 107 #endif
 108
 109 struct cpu_user_fns {
 110         void (*cpu_clear_user_page)(void *p, unsigned long user);
 111         void (*cpu_copy_user_page)(void *to, const void *from,
 112                                    unsigned long user);
 113 };
 114
 115 #ifdef MULTI_USER
 116 extern struct cpu_user_fns cpu_user;
 117
 118 #define __cpu_clear_user_page   cpu_user.cpu_clear_user_page
 119 #define __cpu_copy_user_page    cpu_user.cpu_copy_user_page
 120
 121 #else
 122
 123 #define __cpu_clear_user_page   __glue(_USER,_clear_user_page)
 124 #define __cpu_copy_user_page    __glue(_USER,_copy_user_page)
 125
 126 extern void __cpu_clear_user_page(void *p, unsigned long user);
 127 extern void __cpu_copy_user_page(void *to, const void *from,
 128                                  unsigned long user);
 129 #endif
 130
 131 #define clear_user_page(addr,vaddr,pg)   __cpu_clear_user_page(addr, vaddr)
 132 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
 133
 134 #define clear_page(page)        memzero((void *)(page), PAGE_SIZE)
 135 extern void copy_page(void *to, const void *from);
 136
 137 #undef STRICT_MM_TYPECHECKS
 138
 139 #ifdef STRICT_MM_TYPECHECKS
 140 /*
 141  * These are used to make use of C type-checking..
 142  */
 143 typedef struct { unsigned long pte; } pte_t;
 144 typedef struct { unsigned long pmd; } pmd_t;
 145 typedef struct { unsigned long pgd[2]; } pgd_t;
 146 typedef struct { unsigned long pgprot; } pgprot_t;
 147
 148 #define pte_val(x)      ((x).pte)
 149 #define pmd_val(x)      ((x).pmd)
 150 #define pgd_val(x)      ((x).pgd[0])
 151 #define pgprot_val(x)   ((x).pgprot)
 152
 153 #define __pte(x)        ((pte_t) { (x) } )
 154 #define __pmd(x)        ((pmd_t) { (x) } )
 155 #define __pgprot(x)     ((pgprot_t) { (x) } )
 156
 157 #else
 158 /*
 159  * .. while these make it easier on the compiler
 160  */
 161 typedef unsigned long pte_t;
 162 typedef unsigned long pmd_t;
 163 typedef unsigned long pgd_t[2];
 164 typedef unsigned long pgprot_t;
 165
 166 #define pte_val(x)      (x)
 167 #define pmd_val(x)      (x)
 168 #define pgd_val(x)      ((x)[0])
 169 #define pgprot_val(x)   (x)
 170
 171 #define __pte(x)        (x)
 172 #define __pmd(x)        (x)
 173 #define __pgprot(x)     (x)
 174
 175 #endif /* STRICT_MM_TYPECHECKS */
 176
 177 /* the upper-most page table pointer */
 178 extern pmd_t *top_pmd;
 179
 180 #endif /* CONFIG_MMU */
 181
 182 #include <asm/memory.h>
 183
 184 #endif /* !__ASSEMBLY__ */
 185
 186 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 187                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 188
 189 /*
 190  * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
 191  */
 192 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
 193 #define ARCH_SLAB_MINALIGN 8
 194 #endif
 195
 196 #endif /* __KERNEL__ */
 197
 198 #include <asm-generic/page.h>
 199
 200 #endif