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 #include <linux/config.h>
  14
  15 /* PAGE_SHIFT determines the page size */
  16 #define PAGE_SHIFT              12
  17 #define PAGE_SIZE               (1UL << PAGE_SHIFT)
  18 #define PAGE_MASK               (~(PAGE_SIZE-1))
  19
  20 #ifdef __KERNEL__
  21
  22 /* to align the pointer to the (next) page boundary */
  23 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  24
  25 #ifndef __ASSEMBLY__
  26
  27 #include <asm/glue.h>
  28
  29 /*
  30  *      User Space Model
  31  *      ================
  32  *
  33  *      This section selects the correct set of functions for dealing with
  34  *      page-based copying and clearing for user space for the particular
  35  *      processor(s) we're building for.
  36  *
  37  *      We have the following to choose from:
  38  *        v3            - ARMv3
  39  *        v4wt          - ARMv4 with writethrough cache, without minicache
  40  *        v4wb          - ARMv4 with writeback cache, without minicache
  41  *        v4_mc         - ARMv4 with minicache
  42  *        xscale        - Xscale
  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_SA1100
  72 # ifdef _USER
  73 #  define MULTI_USER 1
  74 # else
  75 #  define _USER v4_mc
  76 # endif
  77 #endif
  78
  79 #ifdef CONFIG_CPU_XSCALE
  80 # ifdef _USER
  81 #  define MULTI_USER 1
  82 # else
  83 #  define _USER xscale_mc
  84 # endif
  85 #endif
  86
  87 #ifdef CONFIG_CPU_COPY_V6
  88 # define MULTI_USER 1
  89 #endif
  90
  91 #if !defined(_USER) && !defined(MULTI_USER)
  92 #error Unknown user operations model
  93 #endif
  94
  95 struct cpu_user_fns {
  96         void (*cpu_clear_user_page)(void *p, unsigned long user);
  97         void (*cpu_copy_user_page)(void *to, const void *from,
  98                                    unsigned long user);
  99 };
 100
 101 #ifdef MULTI_USER
 102 extern struct cpu_user_fns cpu_user;
 103
 104 #define __cpu_clear_user_page   cpu_user.cpu_clear_user_page
 105 #define __cpu_copy_user_page    cpu_user.cpu_copy_user_page
 106
 107 #else
 108
 109 #define __cpu_clear_user_page   __glue(_USER,_clear_user_page)
 110 #define __cpu_copy_user_page    __glue(_USER,_copy_user_page)
 111
 112 extern void __cpu_clear_user_page(void *p, unsigned long user);
 113 extern void __cpu_copy_user_page(void *to, const void *from,
 114                                  unsigned long user);
 115 #endif
 116
 117 #define clear_user_page(addr,vaddr,pg)                  \
 118         do {                                            \
 119                 preempt_disable();                      \
 120                 __cpu_clear_user_page(addr, vaddr);     \
 121                 preempt_enable();                       \
 122         } while (0)
 123
 124 #define copy_user_page(to,from,vaddr,pg)                \
 125         do {                                            \
 126                 preempt_disable();                      \
 127                 __cpu_copy_user_page(to, from, vaddr);  \
 128                 preempt_enable();                       \
 129         } while (0)
 130
 131 #define clear_page(page)        memzero((void *)(page), PAGE_SIZE)
 132 extern void copy_page(void *to, const void *from);
 133
 134 #undef STRICT_MM_TYPECHECKS
 135
 136 #ifdef STRICT_MM_TYPECHECKS
 137 /*
 138  * These are used to make use of C type-checking..
 139  */
 140 typedef struct { unsigned long pte; } pte_t;
 141 typedef struct { unsigned long pmd; } pmd_t;
 142 typedef struct { unsigned long pgd[2]; } pgd_t;
 143 typedef struct { unsigned long pgprot; } pgprot_t;
 144
 145 #define pte_val(x)      ((x).pte)
 146 #define pmd_val(x)      ((x).pmd)
 147 #define pgd_val(x)      ((x).pgd[0])
 148 #define pgprot_val(x)   ((x).pgprot)
 149
 150 #define __pte(x)        ((pte_t) { (x) } )
 151 #define __pmd(x)        ((pmd_t) { (x) } )
 152 #define __pgprot(x)     ((pgprot_t) { (x) } )
 153
 154 #else
 155 /*
 156  * .. while these make it easier on the compiler
 157  */
 158 typedef unsigned long pte_t;
 159 typedef unsigned long pmd_t;
 160 typedef unsigned long pgd_t[2];
 161 typedef unsigned long pgprot_t;
 162
 163 #define pte_val(x)      (x)
 164 #define pmd_val(x)      (x)
 165 #define pgd_val(x)      ((x)[0])
 166 #define pgprot_val(x)   (x)
 167
 168 #define __pte(x)        (x)
 169 #define __pmd(x)        (x)
 170 #define __pgprot(x)     (x)
 171
 172 #endif /* STRICT_MM_TYPECHECKS */
 173
 174 /* Pure 2^n version of get_order */
 175 static inline int get_order(unsigned long size)
 176 {
 177         int order;
 178
 179         size = (size-1) >> (PAGE_SHIFT-1);
 180         order = -1;
 181         do {
 182                 size >>= 1;
 183                 order++;
 184         } while (size);
 185         return order;
 186 }
 187
 188 #include <asm/memory.h>
 189
 190 #endif /* !__ASSEMBLY__ */
 191
 192 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 193                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 194
 195 #endif /* __KERNEL__ */
 196
 197 #endif