How to implement virtual hardware in QEMU?

[Douglas Su]

Hello everyone,


    I want to implement some virtual hardware in QEMU for driver testing. For example, to implement a timer which sends interrupt to CPU periodically. However, I can't find any documentation which details the interfaces and the framework. The only clue is the `hw` directory in the source tree of QEMU, but it is so complex for a beginners to start up.


    So, are there helpful videos or articles?


    Regards!
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