Apple Inc.

Nvidia Corporation

Scott Alan Williams

Gordon Y Scott

Andrew C Chang

Yong Wang

Sagheer Ahmad

Aleksandr Frid

Matthew Raymond Longnecker

Robert Alan Bignell

Shailendra Chafekar

Venkata Krishna Reddy Dumpa

Udaykumar Raval

Systems, methods, and computer-readable media for managing near field communications during a low power express mode of an electronic device are provided that may make credentials of a near field communication ('NFC') component appropriately secure and appropriately accessible while also limiting the power consumption of the NFC component and of other components of the electronic device.

Management of near field communications using a low power express mode of an electronic device

To preserve power and increase the overall efficiency of the CPU, the platform idle driver causes the power gate controller to cut power to the idle core. Such power gating is autonomous, i.e., the operating system and the other cores are not involved. In operation, the platform idle driver first prepares the core and the power gate controller for power gating the core. The platform idle driver then triggers the power gating. The power gate controller monitors interrupts released by the interrupt controller, and if any on the released interrupts are associated with the power gated core, the power gate controller resumes dispersing power to the core.

Power-gating in a multi-core system without operating system intervention

To reduce power consumption, a processor can be placed into a reduced power state. Before doing so, interrupt events can be designated as wakeup events. While the processor is in the reduced power state, if an event designated as a wakeup event occurs, then a signal is directed to a wakeup event handler instead of to an interrupt handler. In response to the signal, the wakeup event handler causes power to be restored to the processor, so that the event can be subsequently serviced.

Responding to interrupts while in a reduced power state

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Scott Alan Williams