SVC 78 (0A4E)

LSPACE macro - is type 3, gets LOCAL lock.

Calls module IGC0007H.

GTF data is:
R15
No applicable data.
R0
Address of the associated UCB or zero. If R0 = 0, R1 points to a parameter list. See z/OS DFSMSdfp Advanced Services for a description.
R1
SMF indicator and/or the message buffer address as follows:
Bytes
Contents
0
SMF indicator (caller must be in protect key 0 or authorized to specify either SMF indicator).
X'80'
Build SMF record type 19.
X'40'
LSPACE should test if the SMF volume information is requested before building the SMF record type 19.
1-3
zero or the address of a 30-byte message buffer.
     
CUU dddd The device number in channel-unit format.