est.4 revision 1.3
$NetBSD: est.4,v 1.3 2011/03/04 05:58:07 jruoho Exp $
Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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. Neither the name of the author nor the names of any
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 March 4, 2011 .Dt EST 4 .Os .Sh NAME .Nm est .Nd Enhanced SpeedStep .Sh SYNOPSIS .Cd "est0 at cpu0" .Sh DESCRIPTION The .Nm driver provides support for Enhanced SpeedStep introduced in Intel's first and second generation of Pentium M processors. The following .Xr sysctl 8 variables are available with .Nm : l -tag -width "machdep.est.frequency.available" -offset indent t Ic machdep.est.frequency.target The target frequency of the .Tn CPUs . t Ic machdep.est.frequency.current The current frequency. t Ic machdep.est.frequency.available The frequencies recognized by .Nm . .El
Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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. Neither the name of the author nor the names of any
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 March 4, 2011 .Dt EST 4 .Os .Sh NAME .Nm est .Nd Enhanced SpeedStep .Sh SYNOPSIS .Cd "est0 at cpu0" .Sh DESCRIPTION The .Nm driver provides support for Enhanced SpeedStep introduced in Intel's first and second generation of Pentium M processors. The following .Xr sysctl 8 variables are available with .Nm : l -tag -width "machdep.est.frequency.available" -offset indent t Ic machdep.est.frequency.target The target frequency of the .Tn CPUs . t Ic machdep.est.frequency.current The current frequency. t Ic machdep.est.frequency.available The frequencies recognized by .Nm . .El
p Note, however, that these variables are not guaranteed to exist in the future versions of .Nx . .Sh SEE ALSO .Xr acpicpu 4 , .Xr odcm 4 , .Xr powernow 4 .Sh CAVEATS The .Nm driver is considered a legacy interface to be used only with old systems. It is known to be problematic with new .Tn CPUs . Furthermore, in the unlikely case where both .Nm and .Xr ichlpcib 4 or .Xr piixpcib 4 provide support for SpeedStep, the PCI-based interfaces should not be accessed due possible race conditions.