1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	from: @(#)tss.h	5.4 (Berkeley) 1/18/91
35 * $FreeBSD$
36 */
37
38#ifndef _MACHINE_TSS_H_
39#define _MACHINE_TSS_H_ 1
40
41/*
42 * Intel 386 Context Data Type
43 */
44
45struct i386tss {
46	int	tss_link;	/* actually 16 bits: top 16 bits must be zero */
47	int	tss_esp0; 	/* kernel stack pointer privilege level 0 */
48	int	tss_ss0;	/* actually 16 bits: top 16 bits must be zero */
49	int	tss_esp1; 	/* kernel stack pointer privilege level 1 */
50	int	tss_ss1;	/* actually 16 bits: top 16 bits must be zero */
51	int	tss_esp2; 	/* kernel stack pointer privilege level 2 */
52	int	tss_ss2;	/* actually 16 bits: top 16 bits must be zero */
53	int	tss_cr3; 	/* page table directory */
54	int	tss_eip; 	/* program counter */
55	int	tss_eflags; 	/* program status longword */
56	int	tss_eax;
57	int	tss_ecx;
58	int	tss_edx;
59	int	tss_ebx;
60	int	tss_esp; 	/* user stack pointer */
61	int	tss_ebp; 	/* user frame pointer */
62	int	tss_esi;
63	int	tss_edi;
64	int	tss_es;		/* actually 16 bits: top 16 bits must be zero */
65	int	tss_cs;		/* actually 16 bits: top 16 bits must be zero */
66	int	tss_ss;		/* actually 16 bits: top 16 bits must be zero */
67	int	tss_ds;		/* actually 16 bits: top 16 bits must be zero */
68	int	tss_fs;		/* actually 16 bits: top 16 bits must be zero */
69	int	tss_gs;		/* actually 16 bits: top 16 bits must be zero */
70	int	tss_ldt;	/* actually 16 bits: top 16 bits must be zero */
71	int	tss_ioopt;	/* options & io offset bitmap: currently zero */
72				/* XXX unimplemented .. i/o permission bitmap */
73};
74
75#endif /* _MACHINE_TSS_H_ */
76