LXR linux/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               (~(PAGE_SIZE-1))
  17
  18#ifndef __ASSEMBLY__
  19
  20#ifndef CONFIG_MMU
  21
  22#include "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 *        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_COPY_FEROCEON
  72# ifdef _USER
  73#  define MULTI_USER 1
  74# else
  75#  define _USER feroceon
  76# endif
  77#endif
  78
  79#ifdef CONFIG_CPU_COPY_FA
  80# ifdef _USER
  81#  define MULTI_USER 1
  82# else
  83#  define _USER fa
  84# endif
  85#endif
  86
  87#ifdef CONFIG_CPU_SA1100
  88# ifdef _USER
  89#  define MULTI_USER 1
  90# else
  91#  define _USER v4_mc
  92# endif
  93#endif
  94
  95#ifdef CONFIG_CPU_XSCALE
  96# ifdef _USER
  97#  define MULTI_USER 1
  98# else
  99#  define _USER xscale_mc
 100# endif
 101#endif
 102
 103#ifdef CONFIG_CPU_XSC3
 104# ifdef _USER
 105#  define MULTI_USER 1
 106# else
 107#  define _USER xsc3_mc
 108# endif
 109#endif
 110
 111#ifdef CONFIG_CPU_COPY_V6
 112# define MULTI_USER 1
 113#endif
 114
 115#if !defined(_USER) && !defined(MULTI_USER)
 116#error Unknown user operations model
 117#endif
 118
 119struct page;
 120
 121struct cpu_user_fns {
 122        void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 123        void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 124                        unsigned long vaddr);
 125};
 126
 127#ifdef MULTI_USER
 128extern struct cpu_user_fns cpu_user;
 129
 130#define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 131#define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 132
 133#else
 134
 135#define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 136#define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 137
 138extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 139extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 140                        unsigned long vaddr);
 141#endif
 142
 143#define clear_user_highpage(page,vaddr)         \
 144         __cpu_clear_user_highpage(page, vaddr)
 145
 146#define __HAVE_ARCH_COPY_USER_HIGHPAGE
 147#define copy_user_highpage(to,from,vaddr,vma)   \
 148        __cpu_copy_user_highpage(to, from, vaddr)
 149
 150#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 151extern void copy_page(void *to, const void *from);
 152
 153#undef STRICT_MM_TYPECHECKS
 154
 155#ifdef STRICT_MM_TYPECHECKS
 156/*
 157 * These are used to make use of C type-checking..
 158 */
 159typedef struct { unsigned long pte; } pte_t;
 160typedef struct { unsigned long pmd; } pmd_t;
 161typedef struct { unsigned long pgd[2]; } pgd_t;
 162typedef struct { unsigned long pgprot; } pgprot_t;
 163
 164#define pte_val(x)      ((x).pte)
 165#define pmd_val(x)      ((x).pmd)
 166#define pgd_val(x)      ((x).pgd[0])
 167#define pgprot_val(x)   ((x).pgprot)
 168
 169#define __pte(x)        ((pte_t) { (x) } )
 170#define __pmd(x)        ((pmd_t) { (x) } )
 171#define __pgprot(x)     ((pgprot_t) { (x) } )
 172
 173#else
 174/*
 175 * .. while these make it easier on the compiler
 176 */
 177typedef unsigned long pte_t;
 178typedef unsigned long pmd_t;
 179typedef unsigned long pgd_t[2];
 180typedef unsigned long pgprot_t;
 181
 182#define pte_val(x)      (x)
 183#define pmd_val(x)      (x)
 184#define pgd_val(x)      ((x)[0])
 185#define pgprot_val(x)   (x)
 186
 187#define __pte(x)        (x)
 188#define __pmd(x)        (x)
 189#define __pgprot(x)     (x)
 190
 191#endif /* STRICT_MM_TYPECHECKS */
 192
 193#endif /* CONFIG_MMU */
 194
 195typedef struct page *pgtable_t;
 196
 197#ifndef CONFIG_SPARSEMEM
 198extern int pfn_valid(unsigned long);
 199#endif
 200
 201#include <asm/memory.h>
 202
 203#endif /* !__ASSEMBLY__ */
 204
 205#define VM_DATA_DEFAULT_FLAGS \
 206        (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 207         VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 208
 209#include <asm-generic/getorder.h>
 210
 211#endif
 212