FreeBSD/Linux Kernel Cross Reference
sys/i386/include/tss.h
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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)tss.h 5.4 (Berkeley) 1/18/91
33 * $FreeBSD$
34 */
35
36 #ifndef _MACHINE_TSS_H_
37 #define _MACHINE_TSS_H_ 1
38
39 /*
40 * Intel 386 Context Data Type
41 */
42
43 struct i386tss {
44 int tss_link; /* actually 16 bits: top 16 bits must be zero */
45 int tss_esp0; /* kernel stack pointer privilege level 0 */
46 int tss_ss0; /* actually 16 bits: top 16 bits must be zero */
47 int tss_esp1; /* kernel stack pointer privilege level 1 */
48 int tss_ss1; /* actually 16 bits: top 16 bits must be zero */
49 int tss_esp2; /* kernel stack pointer privilege level 2 */
50 int tss_ss2; /* actually 16 bits: top 16 bits must be zero */
51 int tss_cr3; /* page table directory */
52 int tss_eip; /* program counter */
53 int tss_eflags; /* program status longword */
54 int tss_eax;
55 int tss_ecx;
56 int tss_edx;
57 int tss_ebx;
58 int tss_esp; /* user stack pointer */
59 int tss_ebp; /* user frame pointer */
60 int tss_esi;
61 int tss_edi;
62 int tss_es; /* actually 16 bits: top 16 bits must be zero */
63 int tss_cs; /* actually 16 bits: top 16 bits must be zero */
64 int tss_ss; /* actually 16 bits: top 16 bits must be zero */
65 int tss_ds; /* actually 16 bits: top 16 bits must be zero */
66 int tss_fs; /* actually 16 bits: top 16 bits must be zero */
67 int tss_gs; /* actually 16 bits: top 16 bits must be zero */
68 int tss_ldt; /* actually 16 bits: top 16 bits must be zero */
69 int tss_ioopt; /* options & io offset bitmap: currently zero */
70 /* XXX unimplemented .. i/o permission bitmap */
71 };
72
73 #endif /* _MACHINE_TSS_H_ */
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