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4b87d7a4 | 1 | /* |
5233806d MS |
2 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
3 | * Copyright (C) 2008-2009 PetaLogix | |
4b87d7a4 MS |
4 | * Copyright (C) 2006 Atmark Techno, Inc. |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | ||
11 | #ifndef _ASM_MICROBLAZE_SEGMENT_H | |
12 | #define _ASM_MICROBLAZE_SEGMENT_H | |
13 | ||
5233806d | 14 | # ifndef __ASSEMBLY__ |
4b87d7a4 MS |
15 | |
16 | typedef struct { | |
17 | unsigned long seg; | |
18 | } mm_segment_t; | |
19 | ||
20 | /* | |
21 | * On Microblaze the fs value is actually the top of the corresponding | |
22 | * address space. | |
23 | * | |
24 | * The fs value determines whether argument validity checking should be | |
25 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
26 | * get_fs() == KERNEL_DS, checking is bypassed. | |
27 | * | |
28 | * For historical reasons, these macros are grossly misnamed. | |
29 | * | |
30 | * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal. | |
31 | */ | |
5233806d MS |
32 | # define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) |
33 | ||
34 | # ifndef CONFIG_MMU | |
35 | # define KERNEL_DS MAKE_MM_SEG(0) | |
4b87d7a4 | 36 | # define USER_DS KERNEL_DS |
5233806d MS |
37 | # else |
38 | # define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
39 | # define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | |
40 | # endif | |
4b87d7a4 MS |
41 | |
42 | # define get_ds() (KERNEL_DS) | |
43 | # define get_fs() (current_thread_info()->addr_limit) | |
5233806d | 44 | # define set_fs(val) (current_thread_info()->addr_limit = (val)) |
4b87d7a4 | 45 | |
5233806d | 46 | # define segment_eq(a, b) ((a).seg == (b).seg) |
4b87d7a4 MS |
47 | |
48 | # endif /* __ASSEMBLY__ */ | |
49 | #endif /* _ASM_MICROBLAZE_SEGMENT_H */ |