mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/* 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
|
|
|
|
|
|
#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 */
|