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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