FreeBSD/Linux Kernel Cross Reference
sys/amd64/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
    
    /*
     * amd64 Context Data Type
     *
     * The alignment is pretty messed up here due to reuse of the original 32 bit
     * fields.  It might be worth trying to set the tss on a +4 byte offset to
     * make the 64 bit fields aligned in practice.
     */
    struct amd64tss {
            u_int32_t       tss_rsvd0;
            u_int64_t       tss_rsp0 __packed;      /* kernel stack pointer ring 0 */
            u_int64_t       tss_rsp1 __packed;      /* kernel stack pointer ring 1 */
            u_int64_t       tss_rsp2 __packed;      /* kernel stack pointer ring 2 */
            u_int32_t       tss_rsvd1;
            u_int32_t       tss_rsvd2;
            u_int64_t       tss_ist1 __packed;      /* Interrupt stack table 1 */
            u_int64_t       tss_ist2 __packed;      /* Interrupt stack table 2 */
            u_int64_t       tss_ist3 __packed;      /* Interrupt stack table 3 */
            u_int64_t       tss_ist4 __packed;      /* Interrupt stack table 4 */
            u_int64_t       tss_ist5 __packed;      /* Interrupt stack table 5 */
            u_int64_t       tss_ist6 __packed;      /* Interrupt stack table 6 */
            u_int64_t       tss_ist7 __packed;      /* Interrupt stack table 7 */
            u_int32_t       tss_rsvd3;
            u_int32_t       tss_rsvd4;
            u_int16_t       tss_rsvd5;
            u_int16_t       tss_iobase;     /* io bitmap offset */
    };
    
    #endif /* _MACHINE_TSS_H_ */

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