55 lines
1.9 KiB
Groff
55 lines
1.9 KiB
Groff
.\" $NetBSD: geodecntr.4,v 1.2 2006/06/24 18:43:08 wiz Exp $
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.\"
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.\" Copyright (c) 2006 Frank Kardel.
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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 ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 24, 2006
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.Dt GEODECNTR 4
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.Os
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.Sh NAME
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.Nm geodecntr
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.Nd AMD Geode SC1100 High Resolution Counter
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.Sh SYNOPSIS
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.Cd "geodegcb* at pci? dev ? function ?"
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.Cd "geodecntr* at geodegcb?"
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.Sh DESCRIPTION
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The
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.Nm
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driver supports the
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.Tn AMD
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SC1100
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controllers
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and provides a timecounter implementation for the 27MHz
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counter.
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.Pp
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The other timing sources in the SC1100 suffer from
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powermanagement features that prohibit i8254 and TSC
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to be used for time keeping.
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This
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.Nm
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driver
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makes the 27MHz counter available for the
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.Xr timecounter 9
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framework.
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.Sh SEE ALSO
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.Xr timecounter 9
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