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 #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_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_XSC3
  88 # ifdef _USER
  89 #  define MULTI_USER 1
  90 # else
  91 #  define _USER xsc3_mc
  92 # endif
  93 #endif
  94
  95 #ifdef CONFIG_CPU_COPY_V6
  96 # define MULTI_USER 1
  97 #endif
  98
  99 #if !defined(_USER) && !defined(MULTI_USER)
 100 #error Unknown user operations model
 101 #endif
 102
 103 struct cpu_user_fns {
 104         void (*cpu_clear_user_page)(void *p, unsigned long user);
 105         void (*cpu_copy_user_page)(void *to, const void *from,
 106                                    unsigned long user);
 107 };
 108
 109 #ifdef MULTI_USER
 110 extern struct cpu_user_fns cpu_user;
 111
 112 #define __cpu_clear_user_page   cpu_user.cpu_clear_user_page
 113 #define __cpu_copy_user_page    cpu_user.cpu_copy_user_page
 114
 115 #else
 116
 117 #define __cpu_clear_user_page   __glue(_USER,_clear_user_page)
 118 #define __cpu_copy_user_page    __glue(_USER,_copy_user_page)
 119
 120 extern void __cpu_clear_user_page(void *p, unsigned long user);
 121 extern void __cpu_copy_user_page(void *to, const void *from,
 122                                  unsigned long user);
 123 #endif
 124
 125 #define clear_user_page(addr,vaddr,pg)   __cpu_clear_user_page(addr, vaddr)
 126 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
 127
 128 #define clear_page(page)        memzero((void *)(page), PAGE_SIZE)
 129 extern void copy_page(void *to, const void *from);
 130
 131 #undef STRICT_MM_TYPECHECKS
 132
 133 #ifdef STRICT_MM_TYPECHECKS
 134 /*
 135  * These are used to make use of C type-checking..
 136  */
 137 typedef struct { unsigned long pte; } pte_t;
 138 typedef struct { unsigned long pmd; } pmd_t;
 139 typedef struct { unsigned long pgd[2]; } pgd_t;
 140 typedef struct { unsigned long pgprot; } pgprot_t;
 141
 142 #define pte_val(x)      ((x).pte)
 143 #define pmd_val(x)      ((x).pmd)
 144 #define pgd_val(x)      ((x).pgd[0])
 145 #define pgprot_val(x)   ((x).pgprot)
 146
 147 #define __pte(x)        ((pte_t) { (x) } )
 148 #define __pmd(x)        ((pmd_t) { (x) } )
 149 #define __pgprot(x)     ((pgprot_t) { (x) } )
 150
 151 #else
 152 /*
 153  * .. while these make it easier on the compiler
 154  */
 155 typedef unsigned long pte_t;
 156 typedef unsigned long pmd_t;
 157 typedef unsigned long pgd_t[2];
 158 typedef unsigned long pgprot_t;
 159
 160 #define pte_val(x)      (x)
 161 #define pmd_val(x)      (x)
 162 #define pgd_val(x)      ((x)[0])
 163 #define pgprot_val(x)   (x)
 164
 165 #define __pte(x)        (x)
 166 #define __pmd(x)        (x)
 167 #define __pgprot(x)     (x)
 168
 169 #endif /* STRICT_MM_TYPECHECKS */
 170
 171 /* the upper-most page table pointer */
 172 extern pmd_t *top_pmd;
 173
 174 #include <asm/memory.h>
 175
 176 #endif /* !__ASSEMBLY__ */
 177
 178 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 179                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 180
 181 /*
 182  * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
 183  */
 184 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
 185 #define ARCH_SLAB_MINALIGN 8
 186 #endif
 187
 188 #endif /* __KERNEL__ */
 189
 190 #include <asm-generic/page.h>
 191
 192 #endif