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               (~((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
 110struct page;
 111struct vm_area_struct;
 112
 113struct 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
 120extern 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
 130extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 131extern 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)
 143extern 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
 157typedef struct page *pgtable_t;
 158
 159#ifdef CONFIG_HAVE_ARCH_PFN_VALID
 160extern 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
 174