Aug. 1, 1979
74.2 IBM VM/370 Data Areas and Control Block Logic

Aug. 1r 1979 PSA Hexadecimal Field
Displacement Name Field Description, Contents, Meaning
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 4DC 4EO 4E4
4E8 4EC 4FO 4F4
4F8 4FC 500 500 540 580 5CO 600 640 650 660 664
668
66C 670 678 680 684 INSTWBD2 DC INSTWRD3 DC· INSTWBD4 DC F'O' F'O' F'O' Reserved for installation use
Reserved for installation use
Reserved for installation use
List of ZEBOES BLANKS
FFS Fregue,!!tly .!!§ed Constants DC 6D'0' DC 8X'40' DC 8X' FF' Also -1 FO EQU ZEROES F1 DC F'1'
F2 DC F'2'
F3 DC F'3'
F4 DC F'4' F5 DC F'5'
F6
F7
F8
F9 F10 F15
F16 F20 F24 F60 F240 F255
F256
F4095
F4096
DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC APTBLK DC NOADD DC X40FFS DC XBIGHT24 DC XPAGNUM DC XBIGHT16 DC AFBEE DC AFBET DC AQCNWT DC ADSPCH DC APTBAN DC X2048BND DC PSBCLR2 DS DUMPSAVE DS SIGSAVE DS LOKSAVE DS MFASAVE DS SWTHSAVE DS LOCKSAV DS SVCREGS DS PREFIXA DC PREFIXB DC PSACPXBP DC RESVD DS WAITSTRT DS
WAITEND DS PWTPAGES DC ACTIVTRQ DC F'6'
F'7'
F'8'
F'9'
F'10'
F'1S'
F'16'
F'20'
F'24'
F'60'
F' 240' F' 2S5'
F'256'
F'4095'
F'4096'
v (DMKPTRLK) X'FFOOOOOO' X'40FFFFFF' X'OOFFFFFF' X'OOFFFOOO' X'OOOOFFFF' V (DMKFREE) V (DMKFRET) V (DMKQCNWT) V (DMKDSPCH) V (D MKPTRAN) X'00FFF800' OF 16F
16F
16F
16F
16F
4F
4F F'O' F'O' A (0) 1F
D
D F'O' A (0) Also
Also
Also
Also
Also
Also
Also X'OOOOOOOF' X'0000003C' X'OOOOOOFO' = X'OOOOOOFF' X'00000100' X'OOOOOFFF' X'00001000' Entry to lock a page in storage
Frequently used work value
Frequently used work value
Isolate right 24 bits
Isolate the page number
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 for DMKEXT DMKLOK 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 processor
Address of CPEXBLOK for switch SVC. Note that PSACPXBP 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
Section 1. CP Data Areas and Control Blocks 75