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.\" $OpenBSD: bios.4,v 1.11 2007/05/31 19:19:54 jmc Exp $
.\"
.\" Copyright (c) 2001 Michael Shalayeff
.\" All rights reserved.
.\"
.\" 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 AUTHOR ``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 AUTHOR 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 MIND,
.\" 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: May 31 2007 $
.Dt BIOS 4 i386
.Os
.Sh NAME
.Nm bios
.Nd a driver for PC Firmware, aka BIOS
.Sh SYNOPSIS
.Cd "bios0 at mainbus0 flags 0x0000"
.Cd "apm0 at bios0 flags 0x0000"
.Cd "pcibios0 at bios0 flags 0x0000"
.Sh DESCRIPTION
.Ox
provides support for PC firmware, aka BIOS and some of its functions,
currently: APM subsystem, BIOS32 extensions, PCI BIOS subsystem.
.Pp
The
.Nm
driver also identifies BIOS type (such as "AT/286+", which is
almost always used in modern machines) and BIOS image date stamp,
which is, presumably, the day the BIOS image was compiled by vendor
and could be used as a crude BIOS version identification.
The
.Nm
driver also scans the ISA memory hole at 640K-1M for optional
ROM images and reserves the space from being used by various
ISA devices, for example
.Xr pcic 4 .
.Pp
Flags is a bit mask, each bit of which specifies which functions
of the driver to disable.
.Bl -tag -width 0x0001
.It 0x0001
BIOS32 attachment.
.Pp
Do not probe or attach to BIOS32 extensions.
BIOS32 is one of
the interfaces to the PCI BIOS configuration tables.
.It 0x0002
PCI BIOS attachment.
.Pp
Do not probe or attach the
.Xr pcibios 4
device, which performs certain PCI configuration tasks.
.It 0x0004
Do not perform the scan for ROM images in the ISA memory hole
(0xc0000 - 0xf0000 physical addresses).
.It 0x0008
SMBIOS attachment.
.Pp
Do not probe or attach to SMBIOS.
SMBIOS provides greater detail about system hardware configuration
and is required to attach
.Xr ipmi 4
on most systems.
.El
.Sh SEE ALSO
.Xr apm 4 ,
.Xr intro 4 ,
.Xr pcibios 4 ,
.Xr pcmcia 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Ox 2.2 .
.Sh BUGS
On some machines optional ROM images do not pass checksum check,
but it's considered better to reserve space for those anyway,
choosing lesser evil from many.
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