PSA Hexadecimal Field
Displacement Name
39C 3AO 3A4
3A8
3AC 3BO 3B4 3BS 3BC 3CO 3C4 3CS 3CC 3DO 3D4 3DS 3DC 3EO 3E4 3ES 3EC 3FO 3F4 3FS 3FC 400 ARSPAC DC AVMREAL DC ASYSABND DC ASYSLC DC ASYSOP DC ARIOCT DC ARIOCH DC ARIOCU DC ARIODV DC ARIOCC DC ARIOUC DC ARIODC DC ACORETBL DC APAGCP DC CPCREGO DC
CPCREG6 DC CPCREGS DC TIMEDISP DS ASVCLIST DC AVMALIST DC LASTUSER DC PAGECUR DS MONNEXT DS PAGEND DS PAGENXT DS TRACEFLG DS v (DMKRSPAC) A (0) A (0) v (DMKSYSLC) V (DMKSYSOP) V (D MKRIOCT) V (DMKRIOCH) V (D MKRIOCU) V (D MKRIODV) V (D MKRIOCC) V (DMKRIOUC) V (DMKBIODC) V (D MKSYSCS) A(X'FFFFFF') X'SOSOOSCO' F'O' F'O' 1F V (D MKSVCNS) V (DMKPRVMA) V (DMKSYSVM) 1F
1F
1F
1F
1F ORG TRACEFLG 400 401 402 404 40S 430 TRACFLG1 DS 1X J1!!§ TRACOl EQU TRAC02 EQU TRAC03 EQU TRAC04 EQU TRAC05 EQU TRAC67 EQU TRACOS EQU TRAC09 EQU TRACFLG2 DS Bits defined TRicOi---EQU TRACOC EQU TRACOD EQU TRACBEF EQO TRAC10 EQU TRACll EQU TRAC12 EQU TRAC13 EQU TRACFLG3 DS TTSEGCNT DS PSARSV15 DS INSTWRD1 DC in TRACFLG1 --X'80'--- X'40' X'20' X'10' X'OS' X'04' X'02' X'01' 1X in TRACFLG2 --X'80'--- X'40' X'20' X'10' X'OS' X'04' X'02' X'01' lH lF 5D P'O' Field Description, Contents, Meaning Address of system accounting chain VMELCK address of virtual=real user. Note
that AVMREAL is maintained in both PSAs Address of system abend Frinter Address of SYSLCCS information
Address of system operator VMELCK Address of real channel index table
Address of first RCHBLCK
Address of first RCUBLOK Address of first RDEVBLCK Address of count of real system channels
Address of count of real system control units
Address of count of real system devices
Address of system CORTABLE Address of first pageable Frogra. CP architecture control and external mask CP assist and virtual machine assist mask MONI!OR CALL enable mask Timer displacement for charge
Address of CP assist pointer list
Address of expanded virtual machine assist
pointer list
Last user te be dispatched
Current monitor buffer page address.
Note that PAGECUR is in absolute PSA. Next availatle address in .eniter buffer.
Note that MONNEXT is in abselute PSA. Last address in current moniter buffer page.
Note that PAGEND is in absclute PSA. Alternate '-cnitoi l:tiffer-page address.
Note that PAGENXT is in absclute PSI. Trace table flags
Trace table flag
External interrupt tracing en SVC interruFt tracing en Program interrupt tracing CD Machine check tracing on I/O interruFt tracing en
FREE/FRET call tracing on
Enter dispatch tracing on
Queue drop tracing on
Trace table flag
Run user tracing on Unstack I/O interrupt tracing on Virtual CSW stored tracing en SIO, !IO, and EDV tracing en Unstack IOBLOK or TRQBLOK tracing on
Trace BTU activity for 370x NCP Lock spin tracing active Signal processor tracing active
Reserved for IBM use
count of total page/swap tables in system.
Note that TTSEGCNT is in absolute PSA. Reserved for IBM use
Reserved for installation use
74 IBM VM/370 Data Areas and Control Block Logic

Hexadecimal Field
Displacement Name 434
438 43C 440 470 478 440 480 484
488 48C 490 494
498 49C 4AO 4A4
4A8 4AC 4BO 4B4
4B8 4BC 4CO 4C4 4C8 4CC 4DO 4D4
4D8 4De 4EO 4E4
4E8 4EC 4FO 4F4 4F8 4FC 500 500 540 580 5CO 600 640 650 660 664
668 66C 670 678 680 684 INSTWRD2 DC INSTWRD3 DC INSTWRD4 DC bis! 2! ZEROES BLANKS FFS FO F1
F2
F3
F4
F5
F6
F7
F8
F9 F10 F15
F16 F20 F24 F60 F240 F255
F256 F409S F4096 DC DC DC EQO DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC APTRLK DC NOADD DC X40FFS DC XRIGHT24 DC XPAGNOM DC XRIGHT16 DC AFREE DC AFRET DC AQCNWT DC iDSPCH DC APTRAN DC X2048BND DC PSBCLR2 DS DUMPSAVE DS SIGSAVE DS LOKSAVE DS BFASAVE DS SWTHSAVE DS LOCKSAV DS SVCREGS DS PREFIXA tc PREFIXB DC PSACPXBP DC RESVD DS WAITSTRT DS WAITEND DS PiTPAGES DC ACTIVTRQ DC F'O' F'O' F'O' 6D'0' 8X'40' 8X'FF' ZEROES F'1'
F'2' F
1
3' F'4' FIS' F'6'
F'7'
F'8'
F'9' F'10' F' 15'
F' 16' F'20' F'24' F'60' F'240' F'255'
F'256' F'4095' F'4096' V (D MKPTRLK) X'PFOOOOOO' X'40FFFFFF' X'OOFFFFFF' X'OOFFFOOO' X'OeOOFFFF' V (DMKFREE) V (D l!KFRET) V (DMKQCNWT) V V (DMKPTRAN) X'00FFF800' OF 16F
16F
16F
16F
16F
4F
4F F'O' F'O' A (0) 1F
D
D F'O' A (0) Field Description, Contents, Meaning Reserved for installation use
Reserved for installation use
Reserved for installaticn use
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-1
= X'CCCCOOOF' X'CCC0003C' = X'COCCOOFO' = X'CCCOOOFF' X'CCC00100' = X'CCCOOF!F' = X'CCC01000' C' 0' Entry to lock a page in stcrage
Frequently used work value
Frequently used work value
Isolate right 24 bits
Isolate the page numrer Isolate the right 16 bits Entry to allocate free storage
Entry to release free storage Entry to write a terminal message Entry to the VM/370 dispatcher Entry to the paging supervisor
Locate a half-page boundary Start of second area cleared by CP initialization (DMKCPI) Save area for dump routine Save area fer DMKEXT DMKLCK save area Save area for malfunction alert DMKVMASW save area LOCK macro save area SVC save area Prefix valUE of this processor Prefix value of other prccessor
Address of CPEXBLOK for switcb SVC. Note that PSACPXEP is in absolute PSA. Reserved for IBM use
Timer value at start of wait
Timer value at end of wait Pages in PGWAIT at start of wait
Address of active transit queue PSI Section 1. CP Data Areas and Control Blocks 75