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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)tss.h 5.4 (Berkeley) 1/18/91
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_TSS_H_
    #define _MACHINE_TSS_H_ 1
    
    /*
     * Intel 386 Context Data Type
     */
    
    struct i386tss {
            int     tss_link;       /* actually 16 bits: top 16 bits must be zero */
            int     tss_esp0;       /* kernel stack pointer privilege level 0 */
            int     tss_ss0;        /* actually 16 bits: top 16 bits must be zero */
            int     tss_esp1;       /* kernel stack pointer privilege level 1 */
            int     tss_ss1;        /* actually 16 bits: top 16 bits must be zero */
            int     tss_esp2;       /* kernel stack pointer privilege level 2 */
            int     tss_ss2;        /* actually 16 bits: top 16 bits must be zero */
            int     tss_cr3;        /* page table directory */
            int     tss_eip;        /* program counter */
            int     tss_eflags;     /* program status longword */
            int     tss_eax;
            int     tss_ecx;
            int     tss_edx;
            int     tss_ebx;
            int     tss_esp;        /* user stack pointer */
            int     tss_ebp;        /* user frame pointer */
            int     tss_esi;
            int     tss_edi;
            int     tss_es;         /* actually 16 bits: top 16 bits must be zero */
            int     tss_cs;         /* actually 16 bits: top 16 bits must be zero */
            int     tss_ss;         /* actually 16 bits: top 16 bits must be zero */
            int     tss_ds;         /* actually 16 bits: top 16 bits must be zero */
            int     tss_fs;         /* actually 16 bits: top 16 bits must be zero */
            int     tss_gs;         /* actually 16 bits: top 16 bits must be zero */
            int     tss_ldt;        /* actually 16 bits: top 16 bits must be zero */
            int     tss_ioopt;      /* options & io offset bitmap: currently zero */
                                    /* XXX unimplemented .. i/o permission bitmap */
    };
    
    #endif /* _MACHINE_TSS_H_ */

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