projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 1da177e4 LT |
15 | |
| 16 | #ifndef __ASSEMBLY__ | |
| 17 | ||
| 18 | typedef struct { | |
| 19 | unsigned long seg; | |
| 20 | } mm_segment_t; | |
| 21 | ||
| 22 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
| 23 | ||
| 24 | #define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL) | |
| 25 | ||
| 26 | #ifdef CONFIG_MMU | |
| 27 | #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | |
| 28 | #else | |
| 29 | #define USER_DS KERNEL_DS | |
| 30 | #endif | |
| 31 | ||
| 32 | #define get_ds() (KERNEL_DS) | |
| 33 | #define get_fs() (__current_thread_info->addr_limit) | |
| 34 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
| 35 | #define __kernel_ds_p() segment_eq(get_fs(), KERNEL_DS) | |
| 36 | #define get_addr_limit() (get_fs().seg) | |
| 37 | ||
| 38 | #define set_fs(_x) \ | |
| 39 | do { \ | |
| 40 | __current_thread_info->addr_limit = (_x); \ | |
| 41 | } while(0) | |
| 42 | ||
| 43 | ||
| 44 | #endif /* __ASSEMBLY__ */ | |
| 45 | #endif /* _ASM_SEGMENT_H */ |