Patent ID: 7797555

Claim:
An apparatus to support power management among multiple processing system partitions, the apparatus comprising: a first interrupt handler to execute in a legacy partition of a processing system, wherein the processing system includes a first processing unit for the legacy partition and a second processing unit for a sequestered partition, wherein the sequestered partition is not visible to an operating system for the processing system; the first interrupt handler to support power management for the first processing unit; a second interrupt handler to execute in the sequestered partition, the second interrupt handler to cause the sequestered partition to take control of power management hardware in the processing system when the legacy partition enters reduced power mode, the second interrupt handler to also program the power management hardware to route interrupts to the second processing unit when the legacy partition is in reduced power mode; and the sequestered partition to relinquish control of power management hardware to the legacy partition when the legacy partition exits reduced power mode.