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== DETAILS Starting to implement the I/O handling on the HID driver. The old implementation basically had a never-ending HIDRead() callback set up, so that callback N would start the read process for invocation N+1. We will take the same approach here; but now that the I/O thread is happenning on its own core, we should be able to let it run full- throttle without impacting emulator performance. Of course, this hinges on the callback actually running on the same core as the syscall was initiated on. == TESTING Can confirm that the read_loop_callback gets invoked on the same core that the HIDRead() was invoked on.