87 lines
2.8 KiB
Groff
87 lines
2.8 KiB
Groff
.\" $NetBSD: amdtemp.4,v 1.4 2008/11/20 10:33:24 wiz Exp $
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.\"-
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.\" Copyright (c) 2008 Christoph Egger
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.\" All rights reserved.
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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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.\" $FreeBSD: src/share/man/man4/coretemp.4,v 1.4 2007/10/15 20:00:19 netchild Exp $
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.\"
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.Dd November 19, 2008
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.Dt AMDTEMP 4
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.Os
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.Sh NAME
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.Nm amdtemp
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.Nd AMD CPU on-die digital thermal sensor
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.Sh SYNOPSIS
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.Cd "amdtemp* at pci? dev ? function ?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the on-die digital thermal sensor present
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on AMD K8, AMD Barcelona, AMD Phenoms, and AMD Griffin CPUs.
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.Pp
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These sensors were officially introduced in AMD K8 Revision F processors,
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and provide 0.5 degC accuracy.
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Precision was improved in Revision
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G chips, which provide two more bits for 0.25 degC steppings.
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Each core
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has two temperature sensors, and there are up to two cores per CPU socket.
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.Pp
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AMD Barcelona, AMD Phenom, and AMD Griffin provide 0.125 degC accuracy
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and provide one temperature sensor for each CPU socket.
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.Pp
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The
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.Nm
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driver reports temperatures through the
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.Xr envsys 4
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API.
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.Bl -column "Sensor " "Units" "Typical" -offset indent
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.It Sy "Sensor " Ta Sy "Units" Ta Sy "Typical Use"
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.It Li "CPUN sensor0" Ta "uK" Ta "cpuN temperature"
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.El
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.Sh SEE ALSO
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.Xr envsys 4 ,
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.Xr envstat 8 ,
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.Xr powerd 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Ox 4.4
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named
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.Dq kate .
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It was then ported to
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.Nx 5.0 .
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The driver has been renamed with support for newer AMD CPUs.
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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 Constantine A. Murenin Aq cnst@openbsd.org
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whilst at the University of Waterloo.
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It was adapted to
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.Nx
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by
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.An Christoph Egger .
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