84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)tss.h 5.4 (Berkeley) 1/18/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_TSS_H_
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#define _MACHINE_TSS_H_ 1
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/*
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* Intel 386 Context Data Type
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*/
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struct i386tss {
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int tss_link; /* actually 16 bits: top 16 bits must be zero */
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int tss_esp0; /* kernel stack pointer privilege level 0 */
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#define tss_ksp tss_esp0
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int tss_ss0; /* actually 16 bits: top 16 bits must be zero */
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int tss_esp1; /* kernel stack pointer privilege level 1 */
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int tss_ss1; /* actually 16 bits: top 16 bits must be zero */
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int tss_esp2; /* kernel stack pointer privilege level 2 */
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int tss_ss2; /* actually 16 bits: top 16 bits must be zero */
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int tss_cr3; /* page table directory */
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#define tss_ptd tss_cr3
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int tss_eip; /* program counter */
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#define tss_pc tss_eip
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int tss_eflags; /* program status longword */
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#define tss_psl tss_eflags
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int tss_eax;
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int tss_ecx;
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int tss_edx;
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int tss_ebx;
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int tss_esp; /* user stack pointer */
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#define tss_usp tss_esp
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int tss_ebp; /* user frame pointer */
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#define tss_fp tss_ebp
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int tss_esi;
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int tss_edi;
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int tss_es; /* actually 16 bits: top 16 bits must be zero */
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int tss_cs; /* actually 16 bits: top 16 bits must be zero */
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int tss_ss; /* actually 16 bits: top 16 bits must be zero */
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int tss_ds; /* actually 16 bits: top 16 bits must be zero */
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int tss_fs; /* actually 16 bits: top 16 bits must be zero */
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int tss_gs; /* actually 16 bits: top 16 bits must be zero */
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int tss_ldt; /* actually 16 bits: top 16 bits must be zero */
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int tss_ioopt; /* options & io offset bitmap: currently zero */
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/* XXX unimplemented .. i/o permission bitmap */
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};
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#endif /* _MACHINE_TSS_H_ */
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