A UIM calls the generic update routine only when the name of a generic device type is based on certain specified features or parameters. It is used to overwrite the standard generic name that is associated with the device type.

The generic update routine can update the generic name only during parameter or feature checking. Also, the UIP must indicate that the generic update routine can update the generic name as a function of device features.

To call the generic update routine within a UIM, use a BALR instruction in 31-bit addressing mode. Use standard register save area conventions. The UCAUGNP field in the UCA contains the address of the generic update routine.

Registers on Entry to the Generic Update Routine

Register 0

Undefined

Register 1

Pointer to a two-word parameter list

• Word 1 - Address of the UCA
• Word 2 - Address of an 8 byte field that contains the name of the generic device type

Register 2-12

Undefined

Register 13

Address of an 18-word save area

Register 14

Return address

Register 15

The generic update routine entry point address

Registers on Exit from the Generic Update Routine

Register 0-14

Restored

Register 15

Return code

Return Codes

RC 0

No errors detected, UIT updated with the new generic name

RC 8

Error detected, no UIT updated, message written