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+.\" $NetBSD: powernow.4,v 1.5 2020/11/14 20:04:46 wiz 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 September 7, 2020
+.Dt POWERNOW 4 x86
+.Os
+.Sh NAME
+.Nm powernow
+.Nd AMD PowerNow! and Cool'n'Quiet
+.Sh SYNOPSIS
+.Cd "powernow0 at cpu0"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports
+.Tn AMD
+.Dq PowerNow!
+and
+.Dq Cool'n'Quiet
+.Tn CPU
+frequency scaling technologies.
+The following
+.Xr sysctl 8
+variables are available with
+.Nm :
+.Bl -tag -width "machdep.cpu.frequency.available" -offset 2n
+.It Ic machdep.cpu.frequency.target
+The target frequency of the
+.Tn CPUs .
+.It Ic machdep.cpu.frequency.current
+The current frequency.
+.It Ic machdep.cpu.frequency.available
+The available frequencies.
+.El
+.Pp
+Note, however, that these variables are
+not guaranteed to exist in the future versions of
+.Nx .
+.Sh SEE ALSO
+.Xr acpicpu 4 ,
+.Xr x86/est 4 ,
+.Xr x86/odcm 4
+.Sh CAVEATS
+The
+.Nm
+driver is considered a legacy interface to
+be used only with relatively old systems.
+The driver supports only
+.Tn AMD
+processor families
+.Tn K7
+(for instance, Duron, Athlon, and some Semprons) and
+.Tn K8
+(namely, the early 64-bit family, including Athlon 64, Opteron, and Turion).