release/src-rt-6.x/linux/linux-2.6/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 <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