92 lines
3.2 KiB
Groff
92 lines
3.2 KiB
Groff
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.\"-
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.\" Copyright (c) 2022 Tetsuya Uemura <t_uemura@macome.co.jp>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd November 18, 2022
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.Dt WDATWD 4
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.Os
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.Sh NAME
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.Nm wdatwd
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.Nd device driver for the ACPI WDAT based watchdog interrupt timer
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device wdatwd"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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wdatwd_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides
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.Xr watchdog 4
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support for the watchdog interrupt timer in ACPI WDAT (Watchdog Action Table).
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.Pp
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Since WDAT itself is an abstraction for the real hardware such as ICH WDT, it
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must be noted that only one driver can be used at a time, either the real
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hardware specific driver or this driver.
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.Sh SYSCTL VARIABLES
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The following read-only
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.Xr sysctl 8
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variables are available:
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.Bl -tag -width indent
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.It Va dev.wdatwd.%d.running
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The status of the watchdog timer. 0 if not running, or 1 if running.
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.It Va dev.wdatwd.%d.timeout
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The current value of the watchdog timeout in millisecond.
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This can be 0 on some systems, and the zero value means that the default
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timeout is used.
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.It Va dev.wdatwd.%d.timeout_configurable
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Whether the timeout is configurable or not.
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It is 0 if configurable or any positive value if not.
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.It Va dev.wdatwd.%d.timeout_default
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The default value of the watchdog timeout in millisecond if any.
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.El
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.Sh SEE ALSO
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.Xr ichwd 4 ,
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.Xr watchdog 4 ,
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.Xr watchdog 8 ,
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.Xr watchdogd 8 ,
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.Xr watchdog 9
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.Rs
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.%T Hardware Watchdog Timers Design Specification
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.%R Requirements for Hardware Watchdog Timers Supported by Microsoft(R) Windows Vista(R) and Microsoft Windows Server(R) 2008 Operating Systems
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.%A Microsoft Corporation
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.%U http://msdn.microsoft.com/en-us/windows/hardware/gg463320.aspx
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.%D 2006
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.Re
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Tetsuya Uemura Aq Mt t_uemura@macome.co.jp
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of MACOME, Corporation.
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