[power]四. Power State Coordination Interface电源管理通用接口

最新推荐文章于 2025-09-19 01:22:15 发布

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最新推荐文章于 2025-09-19 01:22:15 发布 · 2.9k 阅读

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#power domain #PSCI #电源管理通用接口

本文介绍了ARM系统中PSCI接口的功能与应用，探讨了如何通过PSCI实现核心空闲管理、热插拔、big.LITTLE迁移及系统关机重启等电源管理场景，强调了在多核系统中不同电源域间的协调作用。

The Power State Coordination Interface (PSCI) provides an OS agnostic method for implementing power management use cases where cores can be powered up or down. This includes:

Core idle management.
Dynamic addition and removal of cores (hotplug), and secondary core boot.
big.LITTLE migration.
System shutdown and reset.

The messages sent using this interface are received by all relevant levels of execution. That is, if EL2 and EL3 are implemented, a message sent by a Rich OS executing in a guest must be received by a hypervisor. If the hypervisor sends it, the message must be received by the secure firmware that then coordinates with a Trusted OS. This allows each operating system to determine whether context saving is required.

For more information, see the Power State Coordination Interface (PSCI) specification.这部分文档以后看了在分享给同事和大家。

在ARM中，抽象出来了一个电源管理的通用接口，叫做PSCI，用来管里上面四种电源管理cases，不包括DVFS。