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

   1/* virtconvert.h: virtual/physical/page address convertion
   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 <linux/config.h>
  21#include <asm/setup.h>
  22
  23#ifdef CONFIG_MMU
  24
  25#define phys_to_virt(vaddr)     ((void *) ((unsigned long)(vaddr) + PAGE_OFFSET))
  26#define virt_to_phys(vaddr)     ((unsigned long) (vaddr) - PAGE_OFFSET)
  27
  28#else
  29
  30#define phys_to_virt(vaddr)     ((void *) (vaddr))
  31#define virt_to_phys(vaddr)     ((unsigned long) (vaddr))
  32
  33#endif
  34
  35#define virt_to_bus virt_to_phys
  36#define bus_to_virt phys_to_virt
  37
  38#define __page_address(page)    (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
  39#define page_to_phys(page)      virt_to_phys((void *)__page_address(page))
  40
  41#endif
  42#endif
  43