1/* 2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 3 * Copyright (C) 2008-2009 PetaLogix 4 * Copyright (C) 2006 Atmark Techno, Inc. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11#ifndef _ASM_MICROBLAZE_SEGMENT_H 12#define _ASM_MICROBLAZE_SEGMENT_H 13 14# ifndef __ASSEMBLY__ 15 16typedef struct { 17 unsigned long seg; 18} mm_segment_t; 19 20/* 21 * On Microblaze the fs value is actually the top of the corresponding 22 * address space. 23 * 24 * The fs value determines whether argument validity checking should be 25 * performed or not. If get_fs() == USER_DS, checking is performed, with 26 * get_fs() == KERNEL_DS, checking is bypassed. 27 * 28 * For historical reasons, these macros are grossly misnamed. 29 * 30 * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal. 31 */ 32# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) 33 34# ifndef CONFIG_MMU 35# define KERNEL_DS MAKE_MM_SEG(0) 36# define USER_DS KERNEL_DS 37# else 38# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) 39# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) 40# endif 41 42# define get_ds() (KERNEL_DS) 43# define get_fs() (current_thread_info()->addr_limit) 44# define set_fs(val) (current_thread_info()->addr_limit = (val)) 45 46# define segment_eq(a, b) ((a).seg == (b).seg) 47 48# endif /* __ASSEMBLY__ */ 49#endif /* _ASM_MICROBLAZE_SEGMENT_H */ 50