mirror of https://gitee.com/openkylin/linux.git
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
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* Copyright (C) 2008 Michal Simek
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* Copyright (C) 2008 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_SEGMENT_H
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#define _ASM_MICROBLAZE_SEGMENT_H
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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/*
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* On Microblaze the fs value is actually the top of the corresponding
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* address space.
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*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*
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* For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
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*/
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# define KERNEL_DS ((mm_segment_t){0})
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# define USER_DS KERNEL_DS
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# define get_ds() (KERNEL_DS)
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# define get_fs() (current_thread_info()->addr_limit)
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# define set_fs(x) \
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do { current_thread_info()->addr_limit = (x); } while (0)
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# define segment_eq(a, b) ((a).seg == (b).seg)
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# endif /* __ASSEMBLY__ */
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#endif /* _ASM_MICROBLAZE_SEGMENT_H */
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