Document the acpimadt(4) and acpiprt(4) drivers.

Lots of input and `sure' kettenis.

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+.\"	$OpenBSD: acpiprt.4,v 1.1 2007/01/11 21:31:48 mk Exp $
+.\"
+.\" Copyright (c) 2007 Michael Knudsen <mk@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd January 10, 2007
+.Dt ACPIPRT 4
+.Os
+.Sh NAME
+.Nm acpiprt
+.Nd ACPI PCI Routing Table configuration
+.Sh SYNOPSIS
+.Cd "acpiprt* at acpi?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides interrupt mapping information for PCI devices based on
+information from ACPI PCI Routing Table objects.
+Typically there is one PCI Routing Table object for every PCI bus in
+the system, each handled by a seperate
+.Nm
+device.
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr intro 4 ,
+.Xr pci 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.1 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Mark Kettenis Aq kettenis@openbsd.org .