Copyright (c) 2002 Wasabi Systems, Inc.
All rights reserved.
Written by Jason R. Thorpe for Wasabi Systems, Inc.
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This product includes software developed for the NetBSD Project by
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.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
q parity computation , and parity verification.
p
The
.Nm
driver supports the Application Accelerator Units on the following
Intel I/O Processors:
l -bullet .It
Intel i80312 Companion I/O
.Pq IOP310
t Intel i80321 I/O Processor
.El
p The .Nm driver provides a back-end to the .Xr dmover 9 interface, and supports the following .Xr dmover 9 functions: l -tag -width "fill8XX" t zero Zero a region of memory t fill8 Fill a region of memory with an 8-bit value t copy Copy a region of memory t xor2 Perform an XOR of 2 input streams t xor3 Perform an XOR of 3 input streams t xor4 Perform an XOR of 4 input streams t xor5 Perform an XOR of 5 input streams t xor6 Perform an XOR of 6 input streams t xor7 Perform an XOR of 7 input streams t 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.