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+/*-
+ * 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_ */