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78 lines
2.4 KiB
Groff
78 lines
2.4 KiB
Groff
.\" $NetBSD: powernow.4,v 1.2 2011/03/04 05:58:07 jruoho Exp $
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.\"
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.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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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. Neither the name of the author nor the names of any
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 4, 2011
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.Dt POWERNOW 4
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.Os
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.Sh NAME
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.Nm powernow
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.Nd AMD PowerNow! and Cool'n'Quiet
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.Sh SYNOPSIS
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.Cd "powernow0 at cpu0"
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.Sh DESCRIPTION
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The
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.Nm
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driver supports
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.Tn AMD
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.Dq PowerNow!
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and
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.Dq Cool'n'Quiet
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.Tn CPU
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frequency scaling technologies.
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The following
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.Xr sysctl 8
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variables are available with
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.Nm :
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.Bl -tag -width "machdep.powernow.frequency.available" -offset 2n
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.It Ic machdep.powernow.frequency.target
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The target frequency of the
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.Tn CPUs .
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.It Ic machdep.powernow.frequency.current
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The current frequency.
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.It Ic machdep.powernow.frequency.available
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The available frequencies.
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.El
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.Pp
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Note, however, that these variables are
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not guaranteed to exist in the future versions of
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.Nx .
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.Sh SEE ALSO
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.Xr acpicpu 4 ,
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.Xr est 4 ,
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.Xr odcm 4
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.Sh CAVEATS
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The
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.Nm
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driver is considered a legacy interface to
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be used only with relatively old systems.
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The driver supports only
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.Tn AMD
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processor families
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.Tn K7
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(for instance, Duron, Athlon, and some Semprons) and
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.Tn K8
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(namely, the early 64-bit family, including Athlon 64, Opteron, and Turion).
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