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;
 120struct vm_area_struct;
 121
 122struct cpu_user_fns {
 123        void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 124        void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 125                        unsigned long vaddr, struct vm_area_struct *vma);
 126};
 127
 128#ifdef MULTI_USER
 129extern struct cpu_user_fns cpu_user;
 130
 131#define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 132#define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 133
 134#else
 135
 136#define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 137#define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 138
 139extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 140extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 141                        unsigned long vaddr, struct vm_area_struct *vma);
 142#endif
 143
 144#define clear_user_highpage(page,vaddr)         \
 145         __cpu_clear_user_highpage(page, vaddr)
 146
 147#define __HAVE_ARCH_COPY_USER_HIGHPAGE
 148#define copy_user_highpage(to,from,vaddr,vma)   \
 149        __cpu_copy_user_highpage(to, from, vaddr, vma)
 150
 151#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 152extern void copy_page(void *to, const void *from);
 153
 154#ifdef CONFIG_ARM_LPAE
 155#include <asm/pgtable-3level-types.h>
 156#else
 157#include <asm/pgtable-2level-types.h>
 158#endif
 159
 160#endif /* CONFIG_MMU */
 161
 162typedef struct page *pgtable_t;
 163
 164#ifdef CONFIG_HAVE_ARCH_PFN_VALID
 165extern int pfn_valid(unsigned long);
 166#endif
 167
 168#include <asm/memory.h>
 169
 170#endif /* !__ASSEMBLY__ */
 171
 172#define VM_DATA_DEFAULT_FLAGS \
 173        (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 174         VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 175
 176#include <asm-generic/getorder.h>
 177
 178#endif
 179