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