Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (C) 2008 Michal Simek
3 * Copyright (C) 2008 PetaLogix
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
14#ifndef __ASSEMBLY__
15
16typedef 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 */
32# define KERNEL_DS ((mm_segment_t){0})
33# define USER_DS KERNEL_DS
34
35# define get_ds() (KERNEL_DS)
36# define get_fs() (current_thread_info()->addr_limit)
37# define set_fs(x) \
38 do { current_thread_info()->addr_limit = (x); } while (0)
39
40# define segment_eq(a, b) ((a).seg == (b).seg)
41
42# endif /* __ASSEMBLY__ */
43#endif /* _ASM_MICROBLAZE_SEGMENT_H */