1/* $NetBSD: tss.h,v 1.12 2018/07/07 21:35:16 kamil Exp $ */
2
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 * @(#)tss.h 5.4 (Berkeley) 1/18/91
35 */
36
37#ifndef _I386_TSS_H_
38#define _I386_TSS_H_
39
40/*
41 * Intel 386 Context Data Type
42 */
43
44struct i386tss {
45 int __tss_link;
46 int tss_esp0; /* kernel stack pointer at privilege level 0 */
47 int tss_ss0; /* kernel stack segment at privilege level 0 */
48 int __tss_esp1;
49 int __tss_ss1;
50 int __tss_esp2;
51 int __tss_ss2;
52 int tss_cr3; /* page directory paddr */
53 int __tss_eip;
54 int __tss_eflags;
55 int __tss_eax;
56 int __tss_ecx;
57 int __tss_edx;
58 int __tss_ebx;
59 int tss_esp; /* saved stack pointer */
60 int tss_ebp; /* saved frame pointer */
61 int __tss_esi;
62 int __tss_edi;
63 int __tss_es;
64 int __tss_cs;
65 int __tss_ss;
66 int __tss_ds;
67 int tss_fs; /* saved segment register */
68 int tss_gs; /* saved segment register */
69 int tss_ldt; /* LDT selector */
70 int tss_iobase; /* options and I/O permission map offset */
71};
72
73/*
74 * I/O bitmap offset beyond TSS's segment limit means no bitmaps.
75 * (i.e. any I/O attempt generates an exception.)
76 */
77#define IOMAP_INVALOFF 0xffffu
78
79/*
80 * If we have an I/O bitmap, there is only one valid offset.
81 */
82#define IOMAP_VALIDOFF sizeof(struct i386tss)
83
84#endif /* #ifndef _I386_TSS_H_ */
85