Address space authorization

The types of PC routines that the entry table defines determines whether the service provider needs PT and SSAR authority to the user's address space. Authority is needed if:

The entry table defines a basic PC routine that causes a space switch
The entry table defines a stacking PC routine for which the ETDEF macro specifies SASN=OLD.

If the service provider needs PT or SSAR authority, it must be obtained before issuing the ETCON macro. Otherwise, the ETCON macro will fail.

To obtain address space authorization, service provider code, running in the user's address space, must issue the ATSET macro. Input to ATSET must be the AX value reserved by the service provider.