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+.\"	$NetBSD: iopaau.4,v 1.6 2014/03/18 18:20:40 riastradh Exp $
+.\"
+.\" Copyright (c) 2002 Wasabi Systems, Inc.
+.\" All rights reserved.
+.\"
+.\" Written by Jason R. Thorpe for Wasabi Systems, Inc.
+.\"
+.\" 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. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed for the NetBSD Project by
+.\"	Wasabi Systems, Inc.
+.\" 4. The name of Wasabi Systems, Inc. may not be used to endorse
+.\"    or promote products derived from this software without specific prior
+.\"    written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
+.\" 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 August 2, 2002
+.Dt IOPAAU 4 evbarm
+.Os
+.Sh NAME
+.Nm iopaau
+.Nd Intel I/O Processor Application Accelerator Unit
+.Sh SYNOPSIS
+.Cd iopxs* at mainbus?
+.Cd iopaau* at iopxs?
+.Sh DESCRIPTION
+The Application Accelerator Unit, or AAU, provides hardware-assisted
+support for performing block fills on a region of memory, XOR of
+multiple regions of memory
+.Pq parity computation ,
+and parity verification.
+.Pp
+The
+.Nm
+driver supports the Application Accelerator Units on the following
+Intel I/O Processors:
+.Bl -bullet
+.\" .It
+.\" Intel i80312 Companion I/O
+.\" .Pq IOP310
+.It
+Intel i80321 I/O Processor
+.El
+.Pp
+The
+.Nm
+driver provides a back-end to the
+.Xr dmover 9
+interface, and supports the following
+.Xr dmover 9
+functions:
+.Bl -tag -width "fill8XX"
+.It zero
+Zero a region of memory
+.It fill8
+Fill a region of memory with an 8-bit value
+.It copy
+Copy a region of memory
+.It xor2
+Perform an XOR of 2 input streams
+.It xor3
+Perform an XOR of 3 input streams
+.It xor4
+Perform an XOR of 4 input streams
+.It xor5
+Perform an XOR of 5 input streams
+.It xor6
+Perform an XOR of 6 input streams
+.It xor7
+Perform an XOR of 7 input streams
+.It xor8
+Perform an XOR of 8 input streams
+.El
+.Sh SEE ALSO
+.Xr dmover 9
+.Sh HISTORY
+The
+.Nm
+device first appeared in
+.Nx 2.0 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Jason R. Thorpe Aq Mt thorpej@wasabisystems.com
+and contributed by Wasabi Systems, Inc.
+.Sh BUGS
+Due to limitations in how scatter-gather is done by the AAU hardware,
+a given DMA segment must be the same length for the output stream and
+each input stream.  The easiest way to achieve this is to ensure that
+all streams used in an AAU operation begin at the same offset into a
+page.