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Difference between WFI and WFE

techguyz

Hi Experts,

What is the difference between WFE and WFI instructions ?

I am able to interpret WFI is like when the physical interrupt signal is activated then the processor wakes up and similarly how the event is detected in ARM  V8 ?

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  • +1

    Hello,

    to generate an event, there are mainly two ways.

    One is to execute SEV or SEVL instruction.

    Another is to assert EVENT I pin of a cpu core.

    The method to drive EVENTI pin is SOC device specific.

    Best regards,

    Yasuhiko Koumoto.

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  • +1

    Hello,

    to generate an event, there are mainly two ways.

    One is to execute SEV or SEVL instruction.

    Another is to assert EVENT I pin of a cpu core.

    The method to drive EVENTI pin is SOC device specific.

    Best regards,

    Yasuhiko Koumoto.

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