Work in progress support for the SGI Indigo, Indigo 2 and Indy systems

(IP20, IP22, IP24) in 64-bit mode, adapated from NetBSD. Currently limited
to headless operation, input and video drivers will get ported soon.

Should work on all R4000, R4440 and R5000 based systems. L2 cache on R5000SC
Indy not supported yet (coming soon), R4600 not supported yet either (coming
soon as well).

Tested to boot multiuser on: Indigo2 R4000SC, Indy R4000PC, Indy R4000SC,
Indy R5000SC, Indigo2 R4400SC. There are still glitches in the Ethernet driver
which are being looked at.

Expansion support is limited to the GIO E++ board; GIO boards with PCI-GIO
bridges not ported yet due to the lack of hardware, and this kind of driver
does not port blindly.

Most of this work comes from NetBSD, polishing and integration work, as well
as putting as many ``R4x00 in 64-bit mode'' erratas as necessary, by yours
truly.

More work is coming, as well as trying to get some easy way to boot install
kernels (as older PROM can only boot ECOFF binaries, which won't do for the
kernel).

1 files changed, 91 insertions, 0 deletions

diff --git a/share/man/man4/man4.sgi/hpc.4 b/share/man/man4/man4.sgi/hpc.4
new file mode 100644
index 00000000000..c996ce17f38
--- /dev/null
+++ b/share/man/man4/man4.sgi/hpc.4
@@ -0,0 +1,91 @@
+.\"	$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.