Linux v2.6.15-rc6
[pohmelfs.git] / include / asm-frv / segment.h
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1 /* segment.h: MMU segment settings
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #ifndef _ASM_SEGMENT_H
13 #define _ASM_SEGMENT_H
15 #include <linux/config.h>
17 #ifndef __ASSEMBLY__
19 typedef struct {
20 unsigned long seg;
21 } mm_segment_t;
23 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
25 #define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
27 #ifdef CONFIG_MMU
28 #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
29 #else
30 #define USER_DS KERNEL_DS
31 #endif
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)
39 #define set_fs(_x) \
40 do { \
41 __current_thread_info->addr_limit = (_x); \
42 } while(0)
45 #endif /* __ASSEMBLY__ */
46 #endif /* _ASM_SEGMENT_H */