1 /* $NetBSD: tss.h,v 1.4 1994/10/27 04:16:31 cgd 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)tss.h 5.4 (Berkeley) 1/18/91 39 */ 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 priviledge level 0 */ 48 #define tss_ksp tss_esp0 49 int tss_ss0; /* actually 16 bits: top 16 bits must be zero */ 50 int tss_esp1; /* kernel stack pointer priviledge level 1 */ 51 int tss_ss1; /* actually 16 bits: top 16 bits must be zero */ 52 int tss_esp2; /* kernel stack pointer priviledge level 2 */ 53 int tss_ss2; /* actually 16 bits: top 16 bits must be zero */ 54 /* struct ptd *tss_cr3; ** page table directory */ 55 int tss_cr3; /* page table directory */ 56 #define tss_ptd tss_cr3 57 int tss_eip; /* program counter */ 58 #define tss_pc tss_eip 59 int tss_eflags; /* program status longword */ 60 #define tss_psl tss_eflags 61 int tss_eax; 62 int tss_ecx; 63 int tss_edx; 64 int tss_ebx; 65 int tss_esp; /* user stack pointer */ 66 #define tss_usp tss_esp 67 int tss_ebp; /* user frame pointer */ 68 #define tss_fp tss_ebp 69 int tss_esi; 70 int tss_edi; 71 int tss_es; /* actually 16 bits: top 16 bits must be zero */ 72 int tss_cs; /* actually 16 bits: top 16 bits must be zero */ 73 int tss_ss; /* actually 16 bits: top 16 bits must be zero */ 74 int tss_ds; /* actually 16 bits: top 16 bits must be zero */ 75 int tss_fs; /* actually 16 bits: top 16 bits must be zero */ 76 int tss_gs; /* actually 16 bits: top 16 bits must be zero */ 77 int tss_ldt; /* actually 16 bits: top 16 bits must be zero */ 78 int tss_ioopt; /* options & io offset bitmap: currently zero */ 79 /* XXX unimplemented .. i/o permission bitmap */ 80 }; 81