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 #ifndef CONFIG_MMU
  21
  22 #include <asm/page-nommu.h>
  23
  24 #else
  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  *        v4wt          - ARMv4 with writethrough cache, without minicache
  38  *        v4wb          - ARMv4 with writeback cache, without minicache
  39  *        v4_mc         - ARMv4 with minicache
  40  *        xscale        - Xscale
  41  *        xsc3          - XScalev3
  42  */
  43 #undef _USER
  44 #undef MULTI_USER
  45
  46 #ifdef CONFIG_CPU_COPY_V4WT
  47 # ifdef _USER
  48 #  define MULTI_USER 1
  49 # else
  50 #  define _USER v4wt
  51 # endif
  52 #endif
  53
  54 #ifdef CONFIG_CPU_COPY_V4WB
  55 # ifdef _USER
  56 #  define MULTI_USER 1
  57 # else
  58 #  define _USER v4wb
  59 # endif
  60 #endif
  61
  62 #ifdef CONFIG_CPU_COPY_FEROCEON
  63 # ifdef _USER
  64 #  define MULTI_USER 1
  65 # else
  66 #  define _USER feroceon
  67 # endif
  68 #endif
  69
  70 #ifdef CONFIG_CPU_COPY_FA
  71 # ifdef _USER
  72 #  define MULTI_USER 1
  73 # else
  74 #  define _USER fa
  75 # endif
  76 #endif
  77
  78 #ifdef CONFIG_CPU_SA1100
  79 # ifdef _USER
  80 #  define MULTI_USER 1
  81 # else
  82 #  define _USER v4_mc
  83 # endif
  84 #endif
  85
  86 #ifdef CONFIG_CPU_XSCALE
  87 # ifdef _USER
  88 #  define MULTI_USER 1
  89 # else
  90 #  define _USER xscale_mc
  91 # endif
  92 #endif
  93
  94 #ifdef CONFIG_CPU_XSC3
  95 # ifdef _USER
  96 #  define MULTI_USER 1
  97 # else
  98 #  define _USER xsc3_mc
  99 # endif
 100 #endif
 101
 102 #ifdef CONFIG_CPU_COPY_V6
 103 # define MULTI_USER 1
 104 #endif
 105
 106 #if !defined(_USER) && !defined(MULTI_USER)
 107 #error Unknown user operations model
 108 #endif
 109
 110 struct page;
 111 struct vm_area_struct;
 112
 113 struct cpu_user_fns {
 114         void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 115         void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 116                         unsigned long vaddr, struct vm_area_struct *vma);
 117 };
 118
 119 #ifdef MULTI_USER
 120 extern struct cpu_user_fns cpu_user;
 121
 122 #define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 123 #define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 124
 125 #else
 126
 127 #define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 128 #define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 129
 130 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 131 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 132                         unsigned long vaddr, struct vm_area_struct *vma);
 133 #endif
 134
 135 #define clear_user_highpage(page,vaddr)         \
 136          __cpu_clear_user_highpage(page, vaddr)
 137
 138 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 139 #define copy_user_highpage(to,from,vaddr,vma)   \
 140         __cpu_copy_user_highpage(to, from, vaddr, vma)
 141
 142 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 143 extern void copy_page(void *to, const void *from);
 144
 145 #ifdef CONFIG_KUSER_HELPERS
 146 #define __HAVE_ARCH_GATE_AREA 1
 147 #endif
 148
 149 #ifdef CONFIG_ARM_LPAE
 150 #include <asm/pgtable-3level-types.h>
 151 #else
 152 #include <asm/pgtable-2level-types.h>
 153 #endif
 154
 155 #endif /* CONFIG_MMU */
 156
 157 typedef struct page *pgtable_t;
 158
 159 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 160 extern int pfn_valid(unsigned long);
 161 #endif
 162
 163 #include <asm/memory.h>
 164
 165 #endif /* !__ASSEMBLY__ */
 166
 167 #define VM_DATA_DEFAULT_FLAGS \
 168         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 169          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 170
 171 #include <asm-generic/getorder.h>
 172
 173 #endif