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
35#ifndef _MACHINE_TSS_H_
36#define _MACHINE_TSS_H_ 1
37
38/*
39 * Intel 386 Context Data Type
40 */
41
42struct i386tss {
43 int tss_link; /* actually 16 bits: top 16 bits must be zero */
44 int tss_esp0; /* kernel stack pointer privilege level 0 */
45 int tss_ss0; /* actually 16 bits: top 16 bits must be zero */
46 int tss_esp1; /* kernel stack pointer privilege level 1 */
47 int tss_ss1; /* actually 16 bits: top 16 bits must be zero */
48 int tss_esp2; /* kernel stack pointer privilege level 2 */
49 int tss_ss2; /* actually 16 bits: top 16 bits must be zero */
50 int tss_cr3; /* page table directory */
51 int tss_eip; /* program counter */
52 int tss_eflags; /* program status longword */
53 int tss_eax;
54 int tss_ecx;
55 int tss_edx;
56 int tss_ebx;
57 int tss_esp; /* user stack pointer */
58 int tss_ebp; /* user frame pointer */
59 int tss_esi;
60 int tss_edi;
61 int tss_es; /* actually 16 bits: top 16 bits must be zero */
62 int tss_cs; /* actually 16 bits: top 16 bits must be zero */
63 int tss_ss; /* actually 16 bits: top 16 bits must be zero */
64 int tss_ds; /* actually 16 bits: top 16 bits must be zero */
65 int tss_fs; /* actually 16 bits: top 16 bits must be zero */
66 int tss_gs; /* actually 16 bits: top 16 bits must be zero */
67 int tss_ldt; /* actually 16 bits: top 16 bits must be zero */
68 int tss_ioopt; /* options & io offset bitmap: currently zero */
69 /* XXX unimplemented .. i/o permission bitmap */
70};
71
72#endif /* _MACHINE_TSS_H_ */