Primary or access register (AR) If in Access Register ASC mode,
specify SYSSTATE ASCENV=AR before invoking this macro.
Interrupt status:
Enabled for I/O and external interrupts
Locks:
No locks may be held.
Control parameters:
All parameter areas must reside in current primary or be addressable
by the dispatchable unit access list.
In addition, all parameters
must reside in storage of the same key as the caller is executing
in when the macro is invoked unless the the caller is in key 0.