Implementing firmware runtime services in a computer system
US11042485B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Jun 20, 2018 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Nov 12, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/657
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An example method of implementing firmware runtime services in a computer system having a processor with a plurality of hierarchical privilege levels, the method including: calling, from software executing at a first privilege level of the processor, a runtime service stub in a firmware of the computer system; executing, by the runtime service stub, an upcall instruction from the first privilege level to a second privilege level of the processor that is more privileged than the first privilege level; and executing, by a handler, a runtime service at the second privilege level in response to execution of the upcall instruction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.