You can specify the PSW key mask (PKM) that a problem state program must be running under in order to invoke a PC routine. When a program in problem state issues a PC instruction, the system uses the program's PKM and the PC routine's authorization key mask (AKM) to determine whether the program is authorized to invoke the PC routine. If any bit in the program's PKM is on and the corresponding bit in the AKM is also on, the program is authorized and the system invokes the PC routine. Otherwise, the system disallows the invocation.

To define the AKM, specify the AKM parameter on the ETDEF macro.