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Linux kernel mirror (for testing)
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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