The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/tss.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    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  *      from: @(#)tss.h 5.4 (Berkeley) 1/18/91
   35  * $FreeBSD: releng/12.0/sys/i386/include/tss.h 326023 2017-11-20 19:43:44Z pfg $
   36  */
   37 
   38 #ifndef _MACHINE_TSS_H_
   39 #define _MACHINE_TSS_H_ 1
   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 privilege level 0 */
   48         int     tss_ss0;        /* actually 16 bits: top 16 bits must be zero */
   49         int     tss_esp1;       /* kernel stack pointer privilege level 1 */
   50         int     tss_ss1;        /* actually 16 bits: top 16 bits must be zero */
   51         int     tss_esp2;       /* kernel stack pointer privilege level 2 */
   52         int     tss_ss2;        /* actually 16 bits: top 16 bits must be zero */
   53         int     tss_cr3;        /* page table directory */
   54         int     tss_eip;        /* program counter */
   55         int     tss_eflags;     /* program status longword */
   56         int     tss_eax;
   57         int     tss_ecx;
   58         int     tss_edx;
   59         int     tss_ebx;
   60         int     tss_esp;        /* user stack pointer */
   61         int     tss_ebp;        /* user frame pointer */
   62         int     tss_esi;
   63         int     tss_edi;
   64         int     tss_es;         /* actually 16 bits: top 16 bits must be zero */
   65         int     tss_cs;         /* actually 16 bits: top 16 bits must be zero */
   66         int     tss_ss;         /* actually 16 bits: top 16 bits must be zero */
   67         int     tss_ds;         /* actually 16 bits: top 16 bits must be zero */
   68         int     tss_fs;         /* actually 16 bits: top 16 bits must be zero */
   69         int     tss_gs;         /* actually 16 bits: top 16 bits must be zero */
   70         int     tss_ldt;        /* actually 16 bits: top 16 bits must be zero */
   71         int     tss_ioopt;      /* options & io offset bitmap: currently zero */
   72                                 /* XXX unimplemented .. i/o permission bitmap */
   73 };
   74 
   75 #endif /* _MACHINE_TSS_H_ */

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