| /* 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) }) | |
| #ifdef CONFIG_MMU | |
| #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | |
| #define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL) | |
| #else | |
| #define USER_DS MAKE_MM_SEG(memory_end) | |
| #define KERNEL_DS MAKE_MM_SEG(0xe0000000UL) | |
| #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 */ |