| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* virtconvert.h: virtual/physical/page address convertion |
| 2 | * |
| 3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | #ifndef _ASM_VIRTCONVERT_H |
| 12 | #define _ASM_VIRTCONVERT_H |
| 13 | |
| 14 | /* |
| 15 | * Macros used for converting between virtual and physical mappings. |
| 16 | */ |
| 17 | |
| 18 | #ifdef __KERNEL__ |
| 19 | |
| 20 | #include <linux/config.h> |
| 21 | #include <asm/setup.h> |
| 22 | |
| 23 | #ifdef CONFIG_MMU |
| 24 | |
| 25 | #define phys_to_virt(vaddr) ((void *) ((unsigned long)(vaddr) + PAGE_OFFSET)) |
| 26 | #define virt_to_phys(vaddr) ((unsigned long) (vaddr) - PAGE_OFFSET) |
| 27 | |
| 28 | #else |
| 29 | |
| 30 | #define phys_to_virt(vaddr) ((void *) (vaddr)) |
| 31 | #define virt_to_phys(vaddr) ((unsigned long) (vaddr)) |
| 32 | |
| 33 | #endif |
| 34 | |
| 35 | #define virt_to_bus virt_to_phys |
| 36 | #define bus_to_virt phys_to_virt |
| 37 | |
| 38 | #define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT)) |
| 39 | #define page_to_phys(page) virt_to_phys((void *)__page_address(page)) |
| 40 | |
| 41 | #endif |
| 42 | #endif |