57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
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/* segselect.h - IA-32 segment selector header */
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/*
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* Copyright (c) 2012-2014, Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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This header contains the IA-32 segment selector defintions. These are extracted
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into their own file so they can be shared with the host tools.
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*/
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#ifndef _SEGSELECT_H
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#define _SEGSELECT_H
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/*
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* Segment selector macros for the various entries in the GDT. These are
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* actually byte offsets from the start of the entry table (tGdtHeader->pEntries)
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* that are loaded into the appropriate CPU segment register (along with the
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* appropriate T bit and privilege level bits).
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*
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* When referencing a specific GDT descriptor via tGdtHeader->pEntries, use
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* XXX_SEG_SELECTOR/sizeof(tGdtDesc)
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*/
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#define NULL_SEG_SELECTOR 0
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#define KERNEL_CODE_SEG_SELECTOR 0x0008
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#define KERNEL_DATA_SEG_SELECTOR 0x0010
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#endif /* !_SEGSELECT_H */
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