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 43 struct 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