Page of SY20-0884-3 As Updated Aug. 1, 1979 by TNL SN25-0497 PSA PSA is the primary contr.ol block. It controls CP and virtual machine activity. PSA contains the normal low IPL, logout, and PSW information; the processor model, type,
and features; and BALR and FREE areas. PSA also contains monitor and trace data and the
needed linkages to virtual machines, real devices, and spool files.
Note: All fields reside in real PSA unless otherwise specified. Fields residing in absolute PSA are specifically identified. For uniprocessor operation, real PSA equals
absolute PSA (or 0). If the system was running in AP mode when a catastrophic error
occurred, the Attached Processor will no longer be running. System recovery is in
uniprocessor mode and the real PSA will no longer be zero. Page 0, Machine Usage o IPLPSW IPLCCW1 10 IPLCCW2 EXOPSW 20 SVCOPSW PROPSW 30 MCOPSW IOOPSW 40 CSW CAW I Q.UANTUMR 50 TIMER I QUANTUM EXNPSW 60 SVCNPSW PRNPS W 70 MCNPS W IONPSW 80 CPU LOG 100 FXDLOG 160 FPRLOG 180 GPRLOG 1CO CRLOG 200 TEMPSAVE 240 BALRSAVE 280 FREESAVE 2COI FREEWORK 1-------------------------------------- 2FO DATE TODATE 300 STARTIME CPUID 310 IDLEWAIT PAGEWAIT 320 IONTWAIT PROBTIME 330 RUNPSW IRUNUSER IDSPLPSW --------------------------------------i 340 RUNCRO IRUNCR1 ICPSTAT ICPRESTRTI 350 PGREAD IPGWRITE PGWAITIM I 360 IIIIPGWAITPGIIIIIIIIPSASVCCT IP*1 tP*21 , , -, 370lCPID ICPABEND IP*3 IP*4 I ASYSVM I . 380lARSPPR IARSPPU IARSPRD I ARIOPU I 390lARIOPR IARIORD IP*S IP*6 IARSPAC t 3AO I AVMREAL I ASYSABND IASYSLC I ASYSOP I 3BO I AR IOCT !ARIOCH !ARlOCU IARIODV ! I I 3COIARIOCC IARIOUC ,ARlODC ,ACORETBL, I I 3DOIAPAGCP ICPCREGO ICPCREG6 ,CPCREG8 I I , 3EO TIMEDISP IASVCLIST IAVMALlST \ LASTUSERI I 3FO PAGECUR IMONNEXT I PAGEND \PAGENXT I I 400 TRACEFLG ITTSEGCNT IP*7 I P*8 IPSARSV1 I I 410 ALOKRF IALOKSY IPSARECPS 11111I1I11 '1/1111111 420 11111111111//I/PSARSV1511//II/I/I/III/1 430 INSTWRD1 IINSTWRD2 IINSTWRD3 I 440 \ Constants Pool I 4DO \ APTRLK INOADD IX40FFS I ,INSTWRD41 I I I \XRIGHT241 1------------------------------------ I IAFRET I 4EO, XPAGNUM !AFREE 1 ----------------------------------- I I X2048BNDI 4FO I AQCNWT IADSPCH IAPTRAN 1------------------- 5001 I 540 I i 5801 DUMPSAVE SIGSAVE LOKSAVE I I section 1. CP Data Areas and Control Blocks 69

PSA r- 5COI 1 6001 1----- 6401 Aug. 1 .. 1979 MFASAVE SiTHSAVE LOCKSAV 1------------------------------_·----- 6501 SVCREGS 660 PREFIXA 1 PREFIXBI PSACPXBPIIIRESVD//l --------------------------------------1 670 WAITSTRT iAITEND 1 -----------------------------------------1 680 PiTPAGESIACTIVTRQI EMSPEND 1 EMSREC I --------------------------------------1 690 XCPEND IP*7IP*8 IP*91 APSTATUS 1 ---------------------------1 6AO AMCHAREAISHRLKCNTI PROBSTRT , Hexadecimal Field
Displacement Name l1.schilliE Usage
o IPLPSi DS 1D
8
8
C 10 14 10 18 20 28 30 38 40 48
4C 50 54
58 60 68 70 78 ORG RSRTNPSi DS RSRTOPSi OS IPLCCi1 OS ORG PSARSV3 DS TRACSTRT DS TRACEND DS TRACCURR DS IPLCCi2 DS EXOPSi OS SVCOPSW DS PROPSW OS MCOPSW DS IOOPSW DS CSW DS CAW DS QUANTUMR DS TIMER OS QUANTUM DS EXNPSi OS SVCNPSW OS PRNPSi OS MCNPSi DS IONPSW OS IPLPSW 1D
1D 10 IPLCCW1 1F
1F
1F
1F
1D 10 10 10 10 10 1D
1F
1F
1F
1F 10 1D 10 10 10 .------------------- I 6BOI CHGREGS IRUN370E IRESERVED/I , 1 6COI UNSHRVM IP*10IP*111/////RESERVED//II/1 I I 6DOI STACKVM IUNSHRVM2 IADMKCPE IRESERVED/I 1 , 6EOI//I//II//I/RESERVED (cont) 1//////11/1/' 1 1 6FOI ALOKUM IRESERVE I ALOKSP I AEXTSP 1 I , 7001 ATMRSN 1/111/1/1/IRESERVED///IIIIIII' I 1 7101 MONREGS I 1 I I 7501 , LOKSAVE2 Field Description, Contents .. Meaning IPL start PSi Restart new PSW Restart old PSi IPL CCW Reserved for IBM use
Address of start of trace table.
Note that TRACSTRT is in absolute PSA Address of end of trace table.
Note that TRACEND is in absolute PSA Address of next available trace table entry.
Note that TRACCURR is in absolute PSA IPL CCi External old PSi SVC old PSi Program old PSi Machine check old PSi I/O old PSi Channel status word
Channel address word
Interval timer value at last interrupt
13-microsecond interval timer
Interval timer value at last dispatch
External new PSi SVC new PSi Program new PSi Machine check new PSW I/O new PSi 70 IBM VM/370 Data Areas and Control Block Logic