| /* 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 */ |