| /* 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 |