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
42