Justin C. Miller 1904e240cf [kernel] Let endpoints get interrupt notifications ...

- Add a tag field to all endpoint messages, which doubles as a
  notification field
- Add a endpoint_bind_irq syscall to enable an endpoint to listen for
  interrupt notifications. This mechanism needs to change.
- Add a temporary copy of the serial port code to nulldrv, and let it
  take responsibility for COM2

2020-10-05 01:06:49 -07:00

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