System and method for security processor control over CPU power states
US9870473B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2014 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Oct 31, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure presents methods and apparatuses for controlling a power state, which may include a C-state, of one or more processing cores of a processor. In an aspect, an example method of securing a power state change of a processor is presented, the method including the steps of receiving a power state change request from the processor, the processor having a plurality of potential power states each including an operating power profile; determining a power state change request mode associated with the processor; forwarding the power state change request to a security processor where the power state change request mode is a one-time request mode; receiving a power state change request response from the security processor in response to the request; and adjusting the current power state of the processor to the target power state where the power state change request response comprises a power state change approval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.