SVC 5 (0A05)

FREEMAIN macro - is type 1, gets LOCAL lock.

Calls module IGVVSM24, entry point IGC005.

Note: The GETMAIN/FREEMAIN interface provided by SVC 5 can be called in either 24-bit or 31-bit addressing mode. Storage area addresses and lengths are treated as 24-bit addresses and values. If the caller's addressing mode is 31-bit, the parameter list address and the pointers to the length and address lists in the parameter list, if present, are treated as 31-bit addresses. Otherwise, they are treated as 24-bit addresses with the high byte of the address ignored.

GTF data is:

R15 and R0

No applicable data.

R1

Address of the input parameter list.

PLIST

10 bytes, contents are:

Bytes


0-3	a.	Single area request - length to be freed.
	b.	List area request - address of a list of FREEMAIN length requests (1 word per request); last word contains X'80' in byte 0.
	c.	Variable Request-zero
4-7	a.	Single area request - address of a word containing the address of the area to be freed.
	b.	List area request - address of a list of addresses of areas to be freed.
	c.	Variable request-address of a doubleword containing the address to be freed in the first word and the length to be freed in the second word.
8	Flag byte, format is:
	00	Unconditional single area request.
	20	Conditional single area request.
	80	Unconditional list area request.
	A0	Conditional list area request.
	C0	Unconditional variable request.
	E0	Conditional variable request.
9	Subpool identification.

R15: 00 if the storage was freed 04 if the status of the storage is unchanged