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90 lines
2.8 KiB
Groff
90 lines
2.8 KiB
Groff
.\" $NetBSD: est.4,v 1.4 2011/10/20 13:54:38 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 October 20, 2011
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.Dt EST 4
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.Os
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.Sh NAME
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.Nm est
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.Nd Enhanced SpeedStep
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.Sh SYNOPSIS
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.Cd "est0 at cpu0"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for Enhanced SpeedStep introduced in
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Intel's first and second generation of Pentium M processors.
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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.est.frequency.available" -offset indent
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.It Ic machdep.est.frequency.target
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The target frequency of the
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.Tn CPUs .
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.It Ic machdep.est.frequency.current
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The current frequency.
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.It Ic machdep.est.frequency.available
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The frequencies recognized by
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.Nm .
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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 odcm 4 ,
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.Xr powernow 4
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.Rs
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.%A Intel Corporation
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.%T Intel Pentium M Processor.
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.%T Datasheet
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.%D March, 2004
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.%U http://download.intel.com/support/processors/mobile/pm/sb/25261203.pdf
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.Re
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.Rs
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.%A Intel Corporation
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.%T Enhanced Intel SpeedStep Technology for the Intel Pentium M Processor.
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.%T White Paper
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.%D March, 2004
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.%U http://download.intel.com/design/network/papers/30117401.pdf
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.Re
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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 be used only with old systems.
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It is known to be problematic with new
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.Tn CPUs .
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Furthermore, in the unlikely case where both
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.Nm
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and
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.Xr ichlpcib 4
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or
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.Xr piixpcib 4
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provide support for SpeedStep,
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the PCI-based interfaces should not be accessed due possible race conditions.
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