sys/dev/virtual/hyperv/vmbus/hyperv_var.h

   1 /*-
   2  * Copyright (c) 2016 Microsoft Corp.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #ifndef _HYPERV_VAR_H_
  30 #define _HYPERV_VAR_H_
  31
  32 #ifndef NANOSEC
  33 #define NANOSEC                 1000000000ULL
  34 #endif
  35 #define HYPERV_TIMER_NS_FACTOR  100ULL
  36 #define HYPERV_TIMER_FREQ       (NANOSEC / HYPERV_TIMER_NS_FACTOR)
  37
  38 typedef uint64_t        (*hyperv_tc64_t)(void);
  39
  40 extern u_int            hyperv_features;
  41 /* NOTE: This could be NULL, if there were no suitable Hyper-V time counter. */
  42 extern hyperv_tc64_t    hyperv_tc64;
  43
  44 uint64_t                hypercall_post_message(bus_addr_t);
  45
  46 #endif  /* !_HYPERV_VAR_H_ */