Patent ID: 7689728

Claim:
A method for describing an ACPI machine language table f or use in a computer having a multibridge structure that connects the computer to a PCI device via plural bridges from a PCI system bus, the method comprising steps of: making a PCI configuration access to a subordinate bridge in a PCI device side, so that the ACPI machine language table supplied from a BIOS returns resource information of the PCI device upon receiving a call requesting a resource information method for the PCI device from an ACPI driver on an OS; making a PCI configuration access to a superordinate bridge in a system bus side, to obtain resource information of the subordinate bridge; and obtaining the resource information of the subordinate bridge from the superordinate bridge, and obtaining secondary resource information from a PCI configuration space of the subordinate bridge, wherein the machine language table returns information concerning the superordinate and subordinate bridges as information hidden from the OS, as well as information concerning the PCI device as information not hidden from the OS.