LXR linux/arch/frv/include/asm/virtconvert.h

   1/* virtconvert.h: virtual/physical/page address conversion
   2 *
   3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11#ifndef _ASM_VIRTCONVERT_H
  12#define _ASM_VIRTCONVERT_H
  13
  14/*
  15 * Macros used for converting between virtual and physical mappings.
  16 */
  17
  18#ifdef __KERNEL__
  19
  20#include <asm/setup.h>
  21
  22#ifdef CONFIG_MMU
  23
  24#define phys_to_virt(vaddr)     ((void *) ((unsigned long)(vaddr) + PAGE_OFFSET))
  25#define virt_to_phys(vaddr)     ((unsigned long) (vaddr) - PAGE_OFFSET)
  26
  27#else
  28
  29#define phys_to_virt(vaddr)     ((void *) (vaddr))
  30#define virt_to_phys(vaddr)     ((unsigned long) (vaddr))
  31
  32#endif
  33
  34#define virt_to_bus virt_to_phys
  35#define bus_to_virt phys_to_virt
  36
  37#define __page_address(page)    (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
  38#define page_to_phys(page)      virt_to_phys((void *)__page_address(page))
  39
  40#endif
  41#endif
  42