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               (_AC(1,UL) << PAGE_SHIFT)
  16 #define PAGE_MASK               (~((1 << PAGE_SHIFT) - 1))
  17
  18 #ifndef __ASSEMBLY__
  19
  20 #include <linux/personality.h>  /* For READ_IMPLIES_EXEC */
  21
  22 #ifndef CONFIG_MMU
  23
  24 #include <asm/page-nommu.h>
  25
  26 #else
  27
  28 #include <asm/glue.h>
  29
  30 /*
  31  *      User Space Model
  32  *      ================
  33  *
  34  *      This section selects the correct set of functions for dealing with
  35  *      page-based copying and clearing for user space for the particular
  36  *      processor(s) we're building for.
  37  *
  38  *      We have the following to choose from:
  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  *        xsc3          - XScalev3
  44  */
  45 #undef _USER
  46 #undef MULTI_USER
  47
  48 #ifdef CONFIG_CPU_COPY_V4WT
  49 # ifdef _USER
  50 #  define MULTI_USER 1
  51 # else
  52 #  define _USER v4wt
  53 # endif
  54 #endif
  55
  56 #ifdef CONFIG_CPU_COPY_V4WB
  57 # ifdef _USER
  58 #  define MULTI_USER 1
  59 # else
  60 #  define _USER v4wb
  61 # endif
  62 #endif
  63
  64 #ifdef CONFIG_CPU_COPY_FEROCEON
  65 # ifdef _USER
  66 #  define MULTI_USER 1
  67 # else
  68 #  define _USER feroceon
  69 # endif
  70 #endif
  71
  72 #ifdef CONFIG_CPU_COPY_FA
  73 # ifdef _USER
  74 #  define MULTI_USER 1
  75 # else
  76 #  define _USER fa
  77 # endif
  78 #endif
  79
  80 #ifdef CONFIG_CPU_SA1100
  81 # ifdef _USER
  82 #  define MULTI_USER 1
  83 # else
  84 #  define _USER v4_mc
  85 # endif
  86 #endif
  87
  88 #ifdef CONFIG_CPU_XSCALE
  89 # ifdef _USER
  90 #  define MULTI_USER 1
  91 # else
  92 #  define _USER xscale_mc
  93 # endif
  94 #endif
  95
  96 #ifdef CONFIG_CPU_XSC3
  97 # ifdef _USER
  98 #  define MULTI_USER 1
  99 # else
 100 #  define _USER xsc3_mc
 101 # endif
 102 #endif
 103
 104 #ifdef CONFIG_CPU_COPY_V6
 105 # define MULTI_USER 1
 106 #endif
 107
 108 #if !defined(_USER) && !defined(MULTI_USER)
 109 #error Unknown user operations model
 110 #endif
 111
 112 struct page;
 113 struct vm_area_struct;
 114
 115 struct cpu_user_fns {
 116         void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 117         void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 118                         unsigned long vaddr, struct vm_area_struct *vma);
 119 };
 120
 121 #ifdef MULTI_USER
 122 extern struct cpu_user_fns cpu_user;
 123
 124 #define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 125 #define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 126
 127 #else
 128
 129 #define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 130 #define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 131
 132 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 133 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 134                         unsigned long vaddr, struct vm_area_struct *vma);
 135 #endif
 136
 137 #define clear_user_highpage(page,vaddr)         \
 138          __cpu_clear_user_highpage(page, vaddr)
 139
 140 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 141 #define copy_user_highpage(to,from,vaddr,vma)   \
 142         __cpu_copy_user_highpage(to, from, vaddr, vma)
 143
 144 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 145 extern void copy_page(void *to, const void *from);
 146
 147 #ifdef CONFIG_KUSER_HELPERS
 148 #define __HAVE_ARCH_GATE_AREA 1
 149 #endif
 150
 151 #ifdef CONFIG_ARM_LPAE
 152 #include <asm/pgtable-3level-types.h>
 153 #else
 154 #include <asm/pgtable-2level-types.h>
 155 #endif
 156
 157 #endif /* CONFIG_MMU */
 158
 159 typedef struct page *pgtable_t;
 160
 161 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 162 extern int pfn_valid(unsigned long);
 163 #endif
 164
 165 #include <asm/memory.h>
 166
 167 #endif /* !__ASSEMBLY__ */
 168
 169 #define VM_DATA_DEFAULT_FLAGS \
 170         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 171          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 172
 173 #include <asm-generic/getorder.h>
 174
 175 #endif