MPBIOS(4) OpenBSD Programmer's Manual (i386) MPBIOS(4)NAMEmpbios - MP BIOS
SYNOPSIS
mpbios0 at bios0
DESCRIPTION
The mpbios driver extracts configuration information from the BIOS on
multiprocessor systems that conform to the Intel MultiProcessor
Specification. This information is used to attach application processors
and APICs, and to assign interrupts to ISA, EISA and PCI devices.
On modern systems this information is provided by ACPI through the
acpimadt(4) device. On such a system mpbios will not attach, even if the
BIOS also contains the data structures specified by the Intel MP
Specification.
The mpbios driver supports version 1.1 and 1.4 of the Intel MP
Specification.
SEE ALSOacpi(4), acpimadt(4), bios(4), cpu(4), intro(4), ioapic(4), pcibios(4)HISTORY
The mpbios driver first appeared in OpenBSD 4.5, based on code present
since OpenBSD 3.6.
OpenBSD 4.9 January 13, 2009 OpenBSD 4.9