root / lab4 / .minix-src / include / i386 / tss.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: tss.h,v 1.10 2008/01/05 21:45:00 yamt Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 1990 The Regents of the University of California.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * William Jolitz.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | *
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| 34 | * @(#)tss.h 5.4 (Berkeley) 1/18/91
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| 35 | */
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| 36 | |||
| 37 | #ifndef _I386_TSS_H_
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| 38 | #define _I386_TSS_H_
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| 39 | |||
| 40 | /*
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| 41 | * Intel 386 Context Data Type
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| 42 | */
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| 43 | |||
| 44 | struct i386tss {
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| 45 | int __tss_link;
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| 46 | int tss_esp0; /* kernel stack pointer at privilege level 0 */ |
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| 47 | int tss_ss0; /* kernel stack segment at privilege level 0 */ |
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| 48 | int __tss_esp1;
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| 49 | int __tss_ss1;
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| 50 | int __tss_esp2;
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| 51 | int __tss_ss2;
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| 52 | int tss_cr3; /* page directory paddr */ |
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| 53 | int __tss_eip;
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| 54 | int __tss_eflags;
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| 55 | int __tss_eax;
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| 56 | int __tss_ecx;
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| 57 | int __tss_edx;
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| 58 | int __tss_ebx;
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| 59 | int tss_esp; /* saved stack pointer */ |
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| 60 | int tss_ebp; /* saved frame pointer */ |
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| 61 | int __tss_esi;
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| 62 | int __tss_edi;
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| 63 | int __tss_es;
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| 64 | int __tss_cs;
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| 65 | int __tss_ss;
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| 66 | int __tss_ds;
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| 67 | int tss_fs; /* saved segment register */ |
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| 68 | int tss_gs; /* saved segment register */ |
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| 69 | int tss_ldt; /* LDT selector */ |
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| 70 | int tss_iobase; /* options and I/O permission map offset */ |
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| 71 | }; |
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| 72 | |||
| 73 | /*
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| 74 | * I/O bitmap offset beyond TSS's segment limit means no bitmaps.
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| 75 | * (i.e. any I/O attempt generates an exception.)
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| 76 | */
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| 77 | #define IOMAP_INVALOFF 0xffff |
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| 78 | |||
| 79 | #endif /* #ifndef _I386_TSS_H_ */ |