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  * 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: releng/8.4/sys/i386/include/tss.h 199583 2009-11-20 15:27:52Z jhb $
   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_ */

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