The spin duration so far (bytes 3,4,5, and 6 of time since the
start of spin).
UNIQUE-2
phycpu--
The physical CPU number of some CPU that is still running with
the terminating ASCB for "S" and 0 for "P". If an ACR condition is
encountered, value can also be 0 for "S".
UNIQUE-3
asid----
The ASID that is the target of CALLRTM TYPE=MEMTERM.