Patent ID: 8312257

Claim:
A resource assignment system, comprising: a BIOS (basic input/output system) controlling hardware; a chipset provided as a component of said hardware and incorporating a bridge device; and a PCI (peripheral components interconnect) device connected to said bridge device, wherein said BIOS includes: a means for determining an I/O (input/output) space range to be assigned to an upper bridge device associated with a PCI device which requests an I/O space when said hardware is started; a means for generating, based on contents determined by said means for determining said I/O space range, a first table related to assignment with a first granularity using Legacy-I/O space for a Pre-Boot environment and a second table related to assignment with a second granularity using an extended I/O space for an OS (operating system) environment; a means for performing initialization of said chipset and said bridge device based on said first table in accordance with the assignment with said first granularity; a means for starting a process under the Pre-Boot environment; a means for starting a boot of an OS under the Pre-Boot environment; a means for performing initialization of said chipset and said bridge device based on said second table in accordance with the assignment with said second granularity, upon switching from the Pre-Boot environment to the OS environment; a means for terminating the process under the Pre-Boot environment; and a means for starting a process under the OS environment.