NAME
mpbios —
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 ALSO
acpi(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.