Add ssio(4).

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+.\"	$OpenBSD: ssio.4,v 1.1 2007/06/19 19:28:25 kettenis Exp $
+.\"
+.\" Copyright (c) 2007 Mark Kettenis <kettenis@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 $Mdocdate: June 19 2007 $
+.Dt SSIO 4 hppa
+.Os
+.Sh NAME
+.Nm ssio
+.Nd National Semiconductor PC87560 Legacy IO
+.Sh SYNOPSIS
+.Cd "ssio* at pci?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the National Semiconductor PC87560 Legacy IO
+chip on systems with PA-8500 and later 64-bit CPUs.
+It configures the Programmable Interrupt Controllers integrated on the chip
+to route interrupts for the integrated
+.Xr ohci 4
+USB controller (which appears as a seperate PCI device).
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr pci 4 ,
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.2 .
+.Sh BUGS
+Support for the integrated serial ports and parallel port is missing.