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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 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 MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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# ifndef CONFIG_MMU
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# define KERNEL_DS MAKE_MM_SEG(0)
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# define USER_DS KERNEL_DS
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# else
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# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
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# endif
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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(val) (current_thread_info()->addr_limit = (val))
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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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