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- /* virtconvert.h: virtual/physical/page address convertion
- *
- * 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
-