1.\" $OpenBSD: mpbios.4,v 1.1 2009/01/13 13:55:03 kettenis Exp $ 2.\" 3.\" Copyright (c) 2009 Mark Kettenis <kettenis@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: January 13 2009 $ 18.Dt MPBIOS 4 i386 19.Os 20.Sh NAME 21.Nm mpbios 22.Nd MP BIOS 23.Sh SYNOPSIS 24.Cd "mpbios0 at bios0" 25.Sh DESCRIPTION 26The 27.Nm 28driver extracts configuration information from the BIOS on 29multiprocessor systems that conform to the Intel MultiProcessor 30Specification. 31This information is used to attach application processors and APICs, 32and to assign interrupts to ISA, EISA and PCI devices. 33.Pp 34On modern systems this information is provided by ACPI through the 35.Xr acpimadt 4 36device. 37On such a system 38.Nm 39will not attach, even if the BIOS also contains the data structures 40specified by the Intel MP Specification. 41.Pp 42The 43.Nm 44driver supports version 1.1 and 1.4 of the Intel MP Specification. 45.Sh SEE ALSO 46.Xr acpi 4 , 47.Xr acpimadt 4 , 48.Xr bios 4 , 49.Xr cpu 4 , 50.Xr intro 4 , 51.Xr ioapic 4 , 52.Xr pcibios 4 53.Sh HISTORY 54The 55.Nm 56driver first appeared in 57.Ox 4.5 , 58based on code present since 59.Ox 3.6 . 60