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 45 struct 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