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[linux-2.6.git] / include / asm-frv / segment.h
1 /* segment.h: MMU segment settings
2  *
3  * Copyright (C) 2003 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
12 #ifndef _ASM_SEGMENT_H
13 #define _ASM_SEGMENT_H
14
15 #include <linux/config.h>
16
17 #ifndef __ASSEMBLY__
18
19 typedef struct {
20         unsigned long seg;
21 } mm_segment_t;
22
23 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
24
25 #define KERNEL_DS               MAKE_MM_SEG(0xdfffffffUL)
26
27 #ifdef CONFIG_MMU
28 #define USER_DS                 MAKE_MM_SEG(TASK_SIZE - 1)
29 #else
30 #define USER_DS                 KERNEL_DS
31 #endif
32
33 #define get_ds()                (KERNEL_DS)
34 #define get_fs()                (__current_thread_info->addr_limit)
35 #define segment_eq(a,b)         ((a).seg == (b).seg)
36 #define __kernel_ds_p()         segment_eq(get_fs(), KERNEL_DS)
37 #define get_addr_limit()        (get_fs().seg)
38
39 #define set_fs(_x)                                      \
40 do {                                                    \
41         __current_thread_info->addr_limit = (_x);       \
42 } while(0)
43
44
45 #endif /* __ASSEMBLY__ */
46 #endif /* _ASM_SEGMENT_H */