tss.h revision 5 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)tss.h	5.4 (Berkeley) 1/18/91
37 */
38
39/*
40 * Intel 386 Context Data Type
41 */
42
43struct i386tss {
44	int	tss_link;	/* actually 16 bits: top 16 bits must be zero */
45	int	tss_esp0; 	/* kernel stack pointer priviledge level 0 */
46#define	tss_ksp	tss_esp0
47	int	tss_ss0;	/* actually 16 bits: top 16 bits must be zero */
48	int	tss_esp1; 	/* kernel stack pointer priviledge level 1 */
49	int	tss_ss1;	/* actually 16 bits: top 16 bits must be zero */
50	int	tss_esp2; 	/* kernel stack pointer priviledge level 2 */
51	int	tss_ss2;	/* actually 16 bits: top 16 bits must be zero */
52	/* struct  ptd *tss_cr3; 	/* page table directory */
53	int	tss_cr3; 	/* page table directory */
54#define	tss_ptd	tss_cr3
55	int	tss_eip; 	/* program counter */
56#define	tss_pc	tss_eip
57	int	tss_eflags; 	/* program status longword */
58#define	tss_psl	tss_eflags
59	int	tss_eax;
60	int	tss_ecx;
61	int	tss_edx;
62	int	tss_ebx;
63	int	tss_esp; 	/* user stack pointer */
64#define	tss_usp	tss_esp
65	int	tss_ebp; 	/* user frame pointer */
66#define	tss_fp	tss_ebp
67	int	tss_esi;
68	int	tss_edi;
69	int	tss_es;		/* actually 16 bits: top 16 bits must be zero */
70	int	tss_cs;		/* actually 16 bits: top 16 bits must be zero */
71	int	tss_ss;		/* actually 16 bits: top 16 bits must be zero */
72	int	tss_ds;		/* actually 16 bits: top 16 bits must be zero */
73	int	tss_fs;		/* actually 16 bits: top 16 bits must be zero */
74	int	tss_gs;		/* actually 16 bits: top 16 bits must be zero */
75	int	tss_ldt;	/* actually 16 bits: top 16 bits must be zero */
76	int	tss_ioopt;	/* options & io offset bitmap: currently zero */
77				/* XXX unimplemented .. i/o permission bitmap */
78};
79