/* * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef _ASM_MICROBLAZE_SEGMENT_H #define _ASM_MICROBLAZE_SEGMENT_H # ifndef __ASSEMBLY__ typedef struct { unsigned long seg; } mm_segment_t; /* * On Microblaze the fs value is actually the top of the corresponding * address space. * * The fs value determines whether argument validity checking should be * performed or not. If get_fs() == USER_DS, checking is performed, with * get_fs() == KERNEL_DS, checking is bypassed. * * For historical reasons, these macros are grossly misnamed. * * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal. */ # define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) # ifndef CONFIG_MMU # define KERNEL_DS MAKE_MM_SEG(0) # define USER_DS KERNEL_DS # else # define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) # define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) # endif # define get_ds() (KERNEL_DS) # define get_fs() (current_thread_info()->addr_limit) # define set_fs(val) (current_thread_info()->addr_limit = (val)) # define segment_eq(a, b) ((a).seg == (b).seg) # endif /* __ASSEMBLY__ */ #endif /* _ASM_MICROBLAZE_SEGMENT_H */