Qualcomm Incorporated

Gur Prasad Srivastava

Matthew Scott McGregor

Tanya Mahajan

Arun Gothekar

Nicolas Thaddee Courtois

Nagarjuna Duvvuru

Nileena Pathalayi Alakandy

Vinay Reddy Venumuddala

Rajesh Chava

Bhavya Soneta

Mukesh Kumar Pravinbhai Savaliya

A peripheral controller includes a serial engine configured to provide an interface to a serial bus, a multiplexer configured to select between transactions directed to the serial bus and initiated in a plurality of execution environments, and an access control circuit configured to determine when a first transaction to be executed over the serial bus is initiated from a first execution environment, enforce an access policy when the first execution environment is a secured execution environment, determine when a second transaction is initiated from a second execution environment, block the second execution environment and a peripheral device from accessing the serial bus when the first execution environment is accessing the serial bus, and provide the second execution environment and the peripheral device access to the serial bus when the second execution environment is an unsecured execution environment. The access policy may be based on an address of a peripheral device.

Sharing and protecting secured subordinate devices on an unsecured bus

Data blocks of an input data unit may be received in parallel as a data segment on a data bus. For each received data segment, tweak values corresponding to the data blocks may be generated using a key and an input vector. The data blocks may be encrypted using parallel encryption circuitry blocks, based on a symmetric block cipher that uses another key and one of the tweak values. The encrypted data blocks may be combined into an output data unit.

Encryption with enhanced tweak generation

A voltage and frequency scaling system for a processor is provided that may be implemented in dedicated logic or in software. The various voltage and frequency settings for the processor comprise a set of performance settings. The system includes a profiler module that maps each performance setting to a workload range for the processor. The profiler module also maps each workload range to a profiled throughput for the processor. Using a predicated average throughput from the mapping, the voltage and frequency scaling system advantageously selects from the performance settings and commands the processor to operate according to the selected performance setting.

Systems and methods for power optimization using throughput feedback

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Bengaluru, India

Gur Prasad Srivastava