1.\"- 2.\" Copyright (c) 2022 Tetsuya Uemura <t_uemura@macome.co.jp> 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd November 18, 2022 26.Dt WDATWD 4 27.Os 28.Sh NAME 29.Nm wdatwd 30.Nd device driver for the ACPI WDAT based watchdog interrupt timer 31.Sh SYNOPSIS 32To compile this driver into the kernel, 33place the following line in your 34kernel configuration file: 35.Bd -ragged -offset indent 36.Cd "device wdatwd" 37.Ed 38.Pp 39Alternatively, to load the driver as a 40module at boot time, place the following line in 41.Xr loader.conf 5 : 42.Bd -literal -offset indent 43wdatwd_load="YES" 44.Ed 45.Sh DESCRIPTION 46The 47.Nm 48driver provides 49.Xr watchdog 4 50support for the watchdog interrupt timer in ACPI WDAT (Watchdog Action Table). 51.Pp 52Since WDAT itself is an abstraction for the real hardware such as ICH WDT, it 53must be noted that only one driver can be used at a time, either the real 54hardware specific driver or this driver. 55.Sh SYSCTL VARIABLES 56The following read-only 57.Xr sysctl 8 58variables are available: 59.Bl -tag -width indent 60.It Va dev.wdatwd.%d.running 61The status of the watchdog timer. 0 if not running, or 1 if running. 62.It Va dev.wdatwd.%d.timeout 63The current value of the watchdog timeout in millisecond. 64This can be 0 on some systems, and the zero value means that the default 65timeout is used. 66.It Va dev.wdatwd.%d.timeout_configurable 67Whether the timeout is configurable or not. 68It is 0 if configurable or any positive value if not. 69.It Va dev.wdatwd.%d.timeout_default 70The default value of the watchdog timeout in millisecond if any. 71.El 72.Sh SEE ALSO 73.Xr ichwd 4 , 74.Xr watchdog 4 , 75.Xr watchdog 8 , 76.Xr watchdogd 8 , 77.Xr watchdog 9 78.Rs 79.%T Hardware Watchdog Timers Design Specification 80.%R Requirements for Hardware Watchdog Timers Supported by Microsoft(R) Windows Vista(R) and Microsoft Windows Server(R) 2008 Operating Systems 81.%A Microsoft Corporation 82.%U http://msdn.microsoft.com/en-us/windows/hardware/gg463320.aspx 83.%D 2006 84.Re 85.Sh AUTHORS 86.An -nosplit 87The 88.Nm 89driver was written by 90.An Tetsuya Uemura Aq Mt t_uemura@macome.co.jp 91of MACOME, Corporation. 92