FreeBSD/Linux Kernel Cross Reference
sys/dev/vmgenc/vmgenc_acpi.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>.  All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    #include <sys/_eventhandler.h>
    
    /*
     * VM Generation Counter driver
     *
     * This driver has two functions: first, it provides a system event (both in
     * the kernel EVENTHANDLER framework as well as a userspace devctl event)
     * whenever a VM has been (HyperV doc, for example):
     * - Snapped and the snapshot is executing
     * - Recovered from backup
     * - Failed over in a HA setup
     * - Imported, copied, or cloned
     * - And unspecified if VM configuration changes might cause a changed
     *   generation counter
     *
     * Second, it can read the current VM generation counter, a 128-bit GUID.
     */
    typedef void (*vmgenc_handler)(void *);
    EVENTHANDLER_DECLARE(acpi_vmgenc_event, vmgenc_handler);

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