blob: 61222f00dfc17cd83538f5507ed3c1ec23368881 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/* segment.h: MMU segment settings
*
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _ASM_SEGMENT_H
#define _ASM_SEGMENT_H
#include <linux/config.h>
#ifndef __ASSEMBLY__
typedef struct {
unsigned long seg;
} mm_segment_t;
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
#ifdef CONFIG_MMU
#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
#else
#define USER_DS KERNEL_DS
#endif
#define get_ds() (KERNEL_DS)
#define get_fs() (__current_thread_info->addr_limit)
#define segment_eq(a,b) ((a).seg == (b).seg)
#define __kernel_ds_p() segment_eq(get_fs(), KERNEL_DS)
#define get_addr_limit() (get_fs().seg)
#define set_fs(_x) \
do { \
__current_thread_info->addr_limit = (_x); \
} while(0)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_SEGMENT_H */
|
