High Level Assembler - Opcodes overview, Extension Set B2

The table below lists all documented opcodes in extension set B2 for IBM mainframe processors. Each opcode links to a text section with some additional info on the pertinent opcode.

Opcode Assignments.

Remark:
Please note that the creation of descriptions for all individual instructions is an ongoing process. As yet no such descriptions have been created for the opcodes on this page.

Extension Set B2 - Control / Various

All instructions in this table are four bytes in length. The first byte always has a value of X'B2', the second byte designates the exact instruction.

Entries with a slightly darker background are no longer supported on current mainframe hardware and/or not supported by IBM's current version of HLASM. The associated mnemonics are printed in italics.
Opcodes that have no (known) mnemonic assigned to them are denoted by their hexadecimal opcode; these are explained below the table.

Information on millicode-only instructions is very limited. What you find here has been gleaned from various IBM patents. Some of these patents appear to contain some errors, or maybe even intentional obfuscation. For example, the instructions RFLG and SFLG seem to have the same opcodes as STFPC and LFPC respectively. Strange, or maybe even suspicious.

B2	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_	LBEAR CONCS	STBEAR DISCS	STIDP	STIDC	SCK	STCK	SCKC	STCKC	SPT	STPT	SPKA	IPK		PTLB
1_	SPX	STPX	STAP	RRB	SIE	CLRP	SETR SSYN	STETR STSYN	PC PCF	SAC	CFC	DEP	DCTP	MAD	MUN	STCAP
2_	SERVC	IPTE	IPM	IVSK	IAC	SSAR	EPAR	ESAR	PT	ISKE	RRBE	SSKE	TB	DXR	PGIN	PGOUT
3_	CSCH	HSCH	MSCH	SSCH	STSCH	TSCH	TPI	SAL	RSCH	STCRW	STCPS	RCHP	SCHM	STZP	SZP	TPZI
4_	BAKR	CKSM	X'B242'	MADS	SQDR	SQER	STURA	MSTA	PALB	EREG	ESTA	LURA	TAR	CPYA	SAR	EAR
5_	CSP		MSR	X'B253'	MVPG	MVST		CUSE	BSG	IESBE	BSA	X'B25B'	X'B25C'	CLST	SRST	CHSC
6_	X'B260'	X'B261'	LKPG	CMPSC X'B263'	X'B264'	SVS	X'B266'	X'B267'	DV	X'B269'	X'B26A'	X'B26B'	X'B26C'	X'B26D'	X'B26E'	X'B26F'
7_	SPCS	STPCS	X'B272'		SIGA	X'B275'	XSCH	RP	STCKE	SACF	X'B27A'	X'B27B'	STCKF X'B27C'	STSI	X'B27E'	X'B27F'
8_	LPP LGND SPP	LGNE	EXPD	EXPE	LCCTL LGCD SCCTL	LPCTL LGCE SPCTL	QSI POWD	LSCTL POWE SSCTL	SIND	SINE	COSD	COSE			QCTRI	QPACI
9_		DPSTO			ATND	ATNE				SRNM			STFPC SFLG	LFPC RFLG	LFLG
A_					MCBDM	TRE	CUUTF CU21	CUTFU CU12	X'B2A8'	X'B2A9'	X'B2AA'	X'B2AB'	X'B2AC'	NQAP	DQAP	PQAP
B_	STFLE	STFL	LPSWE	STEAI					SRNMB	SRNMT				LFAS
C_	ADRN	AERN	SDRN	SERN	MDRN	MERN	DDRN	DERN	LERN	RBD	CCSB	CLRNG	FBE	FBN	FBED	FBND
D_	AACDR	AACER	SACDR	SACER	MACD	MACE	RACD	RACE	AACAC	SACAC	CLAC					EDBYT
E_	SCCTR	SPCTR			ECCTR	EPCTR			PPA X'B2E8.fc'	TRTX			ETND	ECPGA ECA		DPQUO
F_	IUCV						X'B2F6'		TEND		NIAI		TABORT			TRAP4

X'B242' = Add FRR
X'B253' = An unknown instruction
X'B25B'-X'B25C' = Asynchronous Page Facility instructions
X'B260'-X'B261' = Coupling Facility instructions
X'B263'-X'B264' = Coupling Facility instructions
X'B266'-X'B267' = Coupling Facility instructions
X'B269'-X'B26F' = Cryptographic Facility instructions
X'B272' = A Coupling Facility instruction
X'B275' = An unknown instruction
X'B27A'-X'B27C' = Coupling Facility instructions
X'B27E'-X'B27F' = Coupling Facility instructions
X'B2A8'-X'B2A9' = Unknown instructions
X'B2AA' = Dequeue CAM
X'B2AB' = Process CAM Queue
X'B2AC' = Enqueue CAM
X'B2F6' = A Coupling Facility instruction

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