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+.\"	$NetBSD: envctrl.4,v 1.5 2014/03/18 18:20:40 riastradh Exp $
+.\"
+.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd April 14, 2007
+.Dt ENVCTRL 4 sparc64
+.Os
+.Sh NAME
+.Nm envctrl
+.Nd
+.Tn Sun
+Ultra Enterprise 450 environmental monitoring
+.Sh SYNOPSIS
+.Cd "envctrl*	at ebus?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides thermal monitoring of processors and power supplies, as well as
+automatic fan regulation. The driver attaches to the SUNW,envctrl subsystem
+found on Ultra Enterprise 450 systems.
+.Pp
+The following sensors can be queried with
+.Xr envstat 8 :
+.Bl -column "xxxxxxxxxxxxx" "Unit" "Description" -offset indent
+.It Sy "Sensor" Ta Sy "Units" Ta Sy "Description"
+.It Li "CPU0" Ta "degC" Ta "Processor 0 temperature"
+.It Li "CPU1" Ta "degC" Ta "Processor 1 temperature"
+.It Li "CPU2" Ta "degC" Ta "Processor 2 temperature"
+.It Li "CPU3" Ta "degC" Ta "Processor 3 temperature"
+.It Li "PS0" Ta "degC" Ta "Power supply 0 temperature"
+.It Li "PS1" Ta "degC" Ta "Power supply 1 temperature"
+.It Li "PS2" Ta "degC" Ta "Power supply 2 temperature"
+.It Li "ambient" Ta "degC" Ta "Ambient temperature"
+.It Li "cpufan voltage" Ta "V" Ta "Voltage used to drive processor fans"
+.It Li "psfan voltage" Ta "V" Ta "Voltage used to drive power supply fans"
+.It Li "ps failed" Ta "count" Ta "number of failed power supplies"
+.It Li "fans failed" Ta "count" Ta "number of failed fans"
+.El
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr envstat 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 5.0 .
+.Sh AUTHORS
+.An Tobias Nygren Aq Mt tnn@NetBSD.org
+.Sh BUGS
+The driver doesn't support SUNW,envctrltwo found on the Ultra Enterprise 250.
+.Pp
+Environmental interrupts are not supported.