=> R0 = Bit 0: 0 => device, 1 => bus
Bits 8-15: highest device number (if bus)
Bits 16-23: default host ID (if bus) - 255 signifies no host ID
other bits reserved
R1 -> handler code
R2 = value to pass in R12 to the handler
R3 = value to pass in R8 to the handler
<= R0 = device / bus ID (bus ID has LUN/Device fields 0)
This call registers a hardware driver with the SCSI Switcher.
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