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/* virtconvert.h: virtual/physical/page address conversion
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _ASM_VIRTCONVERT_H
#define _ASM_VIRTCONVERT_H
/*
* Macros used for converting between virtual and physical mappings.
*/
#ifdef __KERNEL__
#include <asm/setup.h>
#ifdef CONFIG_MMU
#define phys_to_virt(vaddr) ((void *) ((unsigned long)(vaddr) + PAGE_OFFSET))
#define virt_to_phys(vaddr) ((unsigned long) (vaddr) - PAGE_OFFSET)
#else
#define phys_to_virt(vaddr) ((void *) (vaddr))
#define virt_to_phys(vaddr) ((unsigned long) (vaddr))
#endif
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
#define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
#define page_to_phys(page) virt_to_phys((void *)__page_address(page))
#endif
#endif
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