47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
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/* segment.h: MMU segment settings
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*
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* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_SEGMENT_H
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#define _ASM_SEGMENT_H
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#include <linux/config.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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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
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#ifdef CONFIG_MMU
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#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
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#else
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#define USER_DS KERNEL_DS
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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 segment_eq(a,b) ((a).seg == (b).seg)
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#define __kernel_ds_p() segment_eq(get_fs(), KERNEL_DS)
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#define get_addr_limit() (get_fs().seg)
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#define set_fs(_x) \
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do { \
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__current_thread_info->addr_limit = (_x); \
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} while(0)
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_SEGMENT_H */
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