=> R0 = 0
R1 = &79 (reason code)
R2 = device driver handle
R3 = pointer to device name, or 0 if whole device driver is being deregistered
This service is issued by DeviceFS when a specified device has been killed - usually because a second device of the same name has been registered. If the entire driver is being deregistered, then this service is issued for each name in turn, and a final time with R3 = 0.
See PRM 2, page 426
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