SVC 120

GETMAIN (options RU, RC, VRC and VRU), FREEMAIN (options R, RU, RC, VRC and VRU), and STORAGE

INPUT

Register 0 Number of bytes of memory to obtain or free.

Register 1 Address of memory to free (zero for GETMAIN)

Register 15

Byte	Meaning:
0	Zero
1	Key of memory to obtain or free (not supported)
2	Subpool number of memory to obtain or free
3	Option byte: 00 Conditional GETMAIN 01 Conditional FREEMAIN 02 Unconditional GETMAIN 03 Unconditional FREEMAIN 04 Page boundary bit (not supported)

OUTPUT

Register 1 Address of allocated storage if GETMAIN

Register 15 Return code:

0= Memory obtained or freed

4= Memory not obtained or freed