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_ */ 74