1 /* $NetBSD: tss.h,v 1.12 2018/07/07 21:35:16 kamil 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. 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 * @(#)tss.h 5.4 (Berkeley) 1/18/91 35 */ 36 37 #ifndef _I386_TSS_H_ 38 #define _I386_TSS_H_ 39 40 /* 41 * Intel 386 Context Data Type 42 */ 43 44 struct i386tss { 45 int __tss_link; 46 int tss_esp0; /* kernel stack pointer at privilege level 0 */ 47 int tss_ss0; /* kernel stack segment at privilege level 0 */ 48 int __tss_esp1; 49 int __tss_ss1; 50 int __tss_esp2; 51 int __tss_ss2; 52 int tss_cr3; /* page directory paddr */ 53 int __tss_eip; 54 int __tss_eflags; 55 int __tss_eax; 56 int __tss_ecx; 57 int __tss_edx; 58 int __tss_ebx; 59 int tss_esp; /* saved stack pointer */ 60 int tss_ebp; /* saved frame pointer */ 61 int __tss_esi; 62 int __tss_edi; 63 int __tss_es; 64 int __tss_cs; 65 int __tss_ss; 66 int __tss_ds; 67 int tss_fs; /* saved segment register */ 68 int tss_gs; /* saved segment register */ 69 int tss_ldt; /* LDT selector */ 70 int tss_iobase; /* options and I/O permission map offset */ 71 }; 72 73 /* 74 * I/O bitmap offset beyond TSS's segment limit means no bitmaps. 75 * (i.e. any I/O attempt generates an exception.) 76 */ 77 #define IOMAP_INVALOFF 0xffffu 78 79 /* 80 * If we have an I/O bitmap, there is only one valid offset. 81 */ 82 #define IOMAP_VALIDOFF sizeof(struct i386tss) 83 84 #endif /* #ifndef _I386_TSS_H_ */ 85