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1da177e4 LT |
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 |