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Diffstat (limited to 'static/netbsd/man4/man4.x86/hpet.4')
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diff --git a/static/netbsd/man4/man4.x86/hpet.4 b/static/netbsd/man4/man4.x86/hpet.4 new file mode 100644 index 00000000..f55a9bb9 --- /dev/null +++ b/static/netbsd/man4/man4.x86/hpet.4 @@ -0,0 +1,78 @@ +.\" $NetBSD: hpet.4,v 1.3 2011/06/14 13:59:24 jruoho Exp $ +.\" +.\" Copyright (c) 2010 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 June 14, 2011 +.Dt HPET 4 x86 +.Os +.Sh NAME +.Nm hpet +.Nd High Precision Event Timer +.Sh SYNOPSIS +.Cd "hpet* at acpihpetbus?" +.Cd "hpet* at acpinodebus?" +.Cd "hpet* at amdpcib?" +.Cd "hpet* at ichlpcib?" +.Sh DESCRIPTION +The +.Nm +driver supports High Precision Event Timers +.Pq Tn HPETs . +The +.Tn HPET +architecture defines one main 64-bit counter and several +additional timers with variable width. +The minimum clock frequency of the main timecounter is 10 MHz, +but much higher rates are common. +The additional 32 or 64 -bit parts are typically accessible via +.Tn MMIO +that is set by the system +.Tn BIOS +through +.Tn ACPI . +.Pp +As a +.Tn HPET +can provide higher interrupt rates than a +.Tn RTC +or +.Xr attimer 4 , +multimedia is one typical application context. +The interrupt logic is configurable through +.Tn I/O +.Tn APIC , +but a legacy mode is provided for older systems. +.Sh SEE ALSO +.Xr acpi 4 , +.Xr attimer 4 , +.Xr timecounter 9 , +.Xr tsc 9 +.Rs +.%A Intel Corporation +.%T IA-PC HPET (High Precision Event Timers) Specification +.%N Revision 1.0a +.%D October, 2004 +.%U http://www.intel.com/hardwaredesign/hpetspec_1.pdf +.Re |