=> R0 = reason code
R1 = device driver's handle,
or path,
or 0 to broadcast to all devices
R2-R7 are passed to device driver, and depend on reason code
<= depends on device and reason code
This SWI calls the device entry point specified by the reason code. The device(s) to call can be specfied by device handle, filename in the directory structure ($ may be used), or 0 to broadcast to all devices.
See PRM 2, page 434.
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