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MPBIOS(4) Device Drivers Manual (amd64) MPBIOS(4)

mpbios
MP BIOS

mpbios0 at bios0

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.

acpi(4), acpimadt(4), bios(4), cpu(4), intro(4), ioapic(4)

The mpbios driver first appeared in OpenBSD 4.5, based on code present since OpenBSD 3.6.
January 13, 2009 OpenBSD-current