/* 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 */