公开(公告)号：US20150268706A1

公开(公告)日：2015-09-24

申请号：US14304894

申请日：2014-06-14

Applicant: QUALCOMM INCORPORATED

Inventor： TERO KUKOLA ,  CARL VICTOR STREETER ,  THOMAS ZENG ,  AJAYKUMAR SHANKARGOUDA PATIL ,  CHRISTOPHER ALAN PAGNOTTA ,  VINAY JAIN ,  SATYAKI MUKHERJEE ,  AZZEDINE TOUZNI

IPC: G06F1/26 ,  G06F21/64

CPC classification number: G06F21/64 ,  G06F21/81

Abstract: Various embodiments of methods and systems for hardware-based memory power management (“HMPM”) in a portable computing device (“PCD”) running secure and non-secure execution environments are disclosed. Hardware-based state machines are uniquely associated with, and under the control of, the non-secure execution environment, the secure execution environment and a virtual manager, respectively. The states of the state machines constitute votes by each of the execution environments and the virtual manager to control the power supply state to the memory component, such as a cache memory. The votes are monitored by a digital circuit that, based on a combination logic of the votes, generates an output signal to trigger a power management component to maintain, supply or remove power on a rail associated with the memory component. In this way, the power supply state to the memory component cannot be unilaterally changed by an application running in the non-secure execution environment.

Abstract translation: 公开了在运行安全和非安全执行环境的便携式计算设备（“PCD”）中用于基于硬件的存储器功率管理（“HMPM”）的方法和系统的各种实施例。 基于硬件的状态机分别与非安全执行环境，安全执行环境和虚拟管理器独立地相关联并在其控制下。 状态机的状态由每个执行环境和虚拟管理器构成投票，以控制诸如高速缓冲存储器的存储器组件的电源状态。 投票由数字电路监控，该数字电路基于投票的组合逻辑产生输出信号以触发电力管理组件以维持，提供或移除与存储器组件相关联的轨道上的电力。 以这种方式，通过在非安全执行环境中运行的应用程序不能单方面地改变对存储器组件的供电状态。