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+.\"	$OpenBSD: hpc.4,v 1.4 2012/03/28 20:44:23 miod Exp $
+.\"	$NetBSD: hpc.4,v 1.12 2008/04/30 13:10:56 martin Exp $
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This document is derived from work contributed to The NetBSD Foundation
+.\" by Antti Kantee.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 $Mdocdate: March 28 2012 $
+.Dt HPC 4 sgi
+.Os
+.Sh NAME
+.Nm hpc
+.Nd SGI High performance Peripheral Controller
+.Sh SYNOPSIS
+.Cd "hpc0 at gio0 addr 0x1fb80000"
+.Cd "hpc1 at gio0 addr 0x1fb00000"
+.Cd "hpc2 at gio0 addr 0x1fb98000"
+.\" .Cd "hpc3 at gio0 addr 0x1fb90000"
+.Sh DESCRIPTION
+.Nm
+interfaces the peripherals connected to it to the
+.Xr gio 4
+bus.
+.Nm
+is found on the Indigo, Indy, Challenge S, Challenge M,
+and Indigo2 machines.
+.Pp
+There are three different numerical revisions of the
+.Nm
+controller.
+Revisions 1 and 1.5 exist on Indigo machines,
+as well as GIO32bis expansion cards such as the E++ SEEQ-based
+Ethernet adapter.
+Revision 1.5 supports bi-endian operation.
+Revision 3 exists on Indy, Challenge S, Indigo2, and Challenge M systems.
+It is possible to have an on-board HPC3 as well as HPC1.5-based
+GIO32bis adapters in the Indy and Challenge S systems.
+Additionally, the Challenge S may have a secondary HPC3 if the IOPLUS
+(a.k.a. ''mezzanine'') board is installed.
+.Sh LIST OF DEVICES
+The devices currently supported are:
+.Pp
+.Bl -tag -width 10n -offset 3n -compact
+.It Xr dsclock 4
+DS1286 realtime clock
+.It Xr dpclock 4
+DP8573A realtime clock
+.\" .It Xr haltwo 4
+.\" HAL2 audio controller
+.It Xr sq 4
+Seeq 8003/80C03 Ethernet controller
+.It Xr wdsc 4
+WD33c93 SCSI controller
+.It Xr zs 4
+Zilog Z8530 UART
+.El
+.Sh SEE ALSO
+.Xr gio 4 ,
+.Xr imc 4 ,
+.Xr intro 4
+.Sh BUGS
+.Nm
+Revisions 1 and 1.5 support DMA buffer pointers of only 28 bits
+and may therefore only address 256 megabytes of memory.
+The R4k Indigo and Indy are the only systems that support sufficient
+memory to illustrate this drawback.
+A software workaround is not currently implemented.
+Revision 3, with 32 bit pointers, does not have this limitation.