67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* plex86: run multiple x86 operating systems concurrently
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* Copyright (C) 1999-2003 Kevin P. Lawton
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*
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* descriptor2.h: defines for descriptors and selectors
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __DESCRIPTOR2_H__
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#define __DESCRIPTOR2_H__
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typedef struct
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{
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Bit16u offset_low;
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selector_t selector;
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unsigned count:5;
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unsigned RESERVED:3;
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unsigned type:5;
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unsigned dpl:2;
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unsigned p:1;
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Bit16u offset_high;
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} __attribute__ ((packed)) gate_t;
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#define SET_INT_GATE(d, S,O,P,DPL, D) {\
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d.selector = (S);\
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d.offset_high = (O) >> 16;\
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d.offset_low = (O) & 0xffff;\
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d.RESERVED = 0;\
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d.type = ((D)<<3) | 0x6;\
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d.dpl = (DPL);\
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d.p = (P);\
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}
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#define SET_TRAP_GATE(d, S,O,P,DPL, D) {\
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d.selector = (S);\
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d.offset_high = (O) >> 16;\
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d.offset_low = (O) & 0xffff;\
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d.RESERVED = 0;\
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d.type = ((D)<<3) | 0x7;\
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d.dpl = (DPL);\
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d.p = (P);\
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}
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typedef struct
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{
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Bit32u offset;
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Bit16u selector;
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} __attribute ((packed)) far_jmp_info_t;
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#endif /* __DESCRIPTOR2_H__ */
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