Page of SY20-0884-3 As Updated Aug. 1, 1979 by TNL SN25-0497 MN400: VM/370 Monitor User Class Record. 49 MN410: VM/370 Monitor Shadow Table
Maintenance User Record (5748=XE1). • • 50 MN500: VM/370 Monitor Instruction Si mu la tion Class Record • • • • • • • • 50 MN600: VM/370 Monitor DASTAP I/O Count
Record ••••••••• ••••••• 51 MN602: VM/370 Monitor DASTAP Utilization ____ A ••••••••••••••••• MN700: VM/370 Monitor Seeks Class Record 53 MN802: VM/370 Monitor System Profile
Class • • • • • • • • • • 54 MNDEVLST: VM/370 Monitor Class 6 (DASTAP) Device List. • • • • • • • • • 55 MONCOM: VM/370 Monitor Communications
Area. . . . . . • . . . . 56 MSSCOM: MSS Communications Control Block 59
NCPTBL: Named 370X Control Program Table 60 NICBLOK: Network Interface Control Block 61
NPRTBL: Named 3800 Image Library Table • 63 OBRRECN: Unit Check Error Record (Long Out board Record). • • • • • • • • 64 OBRREC: Unit Check Error Record (Short Ou tboard Record). • • • • • • • • • • • 66 OBRREC: Unit Check Error Record (Short Outboard Record) (5748-XljH ••••• 66.1 OBRREC: Unit Check Error Record (Short Outboard Record) (5748=XE1) ••••• 66.1 OWNDLIST: CP-Owned Volumes List. • • • • 67
PAGTABLE: Translation Page Table • • • • 67 PGBLOK: Pseudo Page Fault Stack Block. • 68 PSA: Prefix Storage Area (Low Storage Locations). • • • • • • • • • • • • 69 PWDIBLOK: Password Invalid Block • • 78
REAL I/O CONTROL BLOCKS ••••••••• 79
Real Channel Control Blocks. • 79 Real Control Unit Blocks • • • 79
Real Device Control Blocks • • 79
Input/Output Blocks. • • • • • •• 79
Network Interface Control Block. • 80 RCHBLOK: Real Channel Block. • • • • 81 RCUBLOK: Real Control Unit Block • • 82 RCWTASK: Translated Virtual I/O CCW ••• 84 RDCBLOK: Real Device Characteristics
for FB-512 Devices •••• 84.1 RDCBLOK: Real Device Characteristics
for FB-512 Devices (57,!!8-XE1) •••• 84.1 RDEVBLOK: Real Device Block ••••••• 85 RECBLOK: DASD Page (Slot) Allocation
Block • • • • • • • • • • • • • • • • RECPAG: Error Recording Page Record •• RSPLCTL: Real Spooling Control Block • RSPXBLOK: Real Device Extension Block. SAVEAREA • • • • • • • • • • • • • • • SAVTABLE: First Page on Saved System • 89 • 90 • 91 • 91 • 92 DASD. • • • • • • • • • • • • • •••• 93 SDRBLOK: Statistical Data Recording
Block • • • • • • • • • • • • • • • • • 94
SEGTABLE: Translation Segment Table. • • 95 SFBLOK: Spool File Block • • • • •••• 96 SHQBLOK: Spool Hold Queue Block. • • • • 98
SHRTABLE: Named-Shared Segment Systems Table • • • • • • • • • • • • • • • • • 99 SPLINK: Spool Page Buffer Linkage Block.100 STOBLOK: Segment Table Origin Control Block (,2148-XE1). • • • • • .100.1 SWPTABLE: Swap Table for Virtual Machine Paging ••••••••••••• 101 SYSLOCS: System Low Storage Information
Block. • • • • • • • • • • • .102 SYSTBL: Named System Table. • .103 TNSREC: "T" Type Record Format
(Environmental Recording) • .. • • • • .104 TNSREC: "T" Type Record For ma t
(Environmental Recording) .104.1 TNSREC: "T" Type Record Format
(Environmental Recording) .104.1 TREXT: Virtual Machine Tracing
Extension to VMBLOK ••• ,' •••••• 105 TRQBLOK: TOD Clock Comparator Request •• 107 UDBFBLOK: User Directory Buffer Block •• 108 UDEVBLOK: User Device Block. • .109 UDIRBLOK: User Directory Block. .110 UMACBLOK: User Machine Block •••••• 111 VIRTU AL I/O CONTROL BLOCKS • • • • • • • 113 Virtual Channel Blocks • • • .113 Virtual Control Unit Blocks •••••• 113 Virtual Device Blocks. • • • • .113 VCHBLOK: Virtual Channel Block. .114 VCONCTL: Virtual Console Control Block .115 VCUBLOK: Virtual Control Unit Block ••• 116 VDEVBLOK: Virtual Device Block ••••• 117 VFCBBLOK: Virtual Forms Control Buffer
Block ••••••••••••••••• 120 VMABLOK: Shared Systems Control
Addition to VMBLOK ••••••••••• 120 VMBLOK: Virtual Machine Control Block •• 121 VMCBLOK: Virtual Machine Communication
Block ••••••••••••••••• 128 VMCMHDR: VMCF Message Header. .129 VMCPARM: VMCF Parameter List. • .130 VMQBLOK: Virtual Machine Queue
Scheduling Block •• .130.1 VMQBLOK: Virtual Machine Queue
Scheduling Block (2748-XE1) •• .130.1 VRRBLOK: Virtual Reserve/Release Block .131 VSPLCTL: Virtual Spooling Control Block.132 VSPXBLOK: Virtual Spool Extension Block.133 XINTBLOK: External Interrupt Block ••• 134 XOBR3211: Extended Outboard Recording
Block. • • •••••••••••• 135 SECTION 2. CMS DATA AREAS AND CONTROL BLOCKS ••••••••••••••••• 137
ABTAB: Abend Termination Option Table •• 138 ABWSECT: Abend Recovery Workspace. .139 ADTSECT: Active Disk Table. • .140 AFTSECT: Active File Table • • • • • • .143 ANCHS ECT: Anchor Ta ble • • • • .145 AVRADR: Volume and Device
Characteristics • .146 AVRADR: Volume and Device
Characteristics .146
BATLSECT: CMS Batch User Job Limits ••• 146
BATLSECT: CMS Batch User Job Limits{5748-XX8). • • • .146.2 BATLSECT:-CMS-Satch User Job
Limits (.2148-XE1). • • • • • • 146.2 BBOX: Boundary Box • • • • • • .146 BBOX: Boundary • .146.2 BBOX: Boundary • .146.2 BGCOM: DOS/VS Partition Communication
Region ••••••••••••••••• 147
vi IBM VM/370 Data Areas and Control Block Logic

Page of SY20-0884-3 As Updated 1, 1979 by TNL SN25-0497 CMSTAXE: Terminal Attention Exit
Element .149 CVTSECT: Communication Vector Table as
supported by CMS. • • • DBGSECT: Debug Work Area • DCHSECT: Data Control
Hyperblock(5748-XX8) •• DCHSECT: Data Control .150 • •• 152 • 1;:)0 • • .156 DEVSECT: Device Table DSECT. .156 DEVSECT: Device Table DSECT(2148-XX8) .156.1 DEVSECT: Device Table .156.1 DEVTAB: Device Table • • • • • • • .157 DIOSECT: Disk I/O Work Area. • • •• 160 DIRSECT: CMS PDS Directory
Entry (5748-XX8) ••••••• DIRSECT: CMS PDS Directory
En try (2 7 4.§=XE 1) • • • • • • • DMSCCB: Command Control Block. DMSCCB: Command Control Block(2748-XX8) ••••••• DMSCCB: Command Control • .162.1 • • 162. 1 • •• 162 • .162.2 • • • • • • • • .162.2 DOSSECT: DOS Simulation control Block •• 164
EDCB: Edit Control Block •••••••• 166 ERDSECT: Error Hand,ling Routine DSECT •• 174 EXTSECT: External Interrupt Work Area •• 177 EXTUAREA: External User Area • • • • •• 179 FCBSECT: Simulated OS Control Blocks •• 180 FCHTAB: Fetch Table •••••• • .184
FICL: First in' Class Block • • • • .185 FRDSECT: Free Chain Element Header
Blocks. • • • • • • • • • • • •• .186 FSCBD: File System Control Block • • • • 188 FSTD: File Status Table Entry DSECT ••• 189 FSTSECT: File Status Table ••••••• 190 FVSECT: Fixed Variable Storage Work Area for CMS File Sy stem. • • • • • • • 191
IHADECB: Data Event Control Block •••• 195 IOSECT: I/O Interrupt Save Area ••••• 196 KEY SECT: Disk Key Table DSECT for BDAM Simulation ••••••••••••••• 197 LABSECT: Tape Label Information (.2748- Xl!!>. • • • • • • • • • • • LABSECT: Tape Label Information
.198 (.2 7 4 .§::.ill). • • • • • • • • • • • • 1 9 8 LDRST: Loader Storage Area. • • • .198 LDRST: Loader Storage Area (5748-IX8) .198.1 LDRST: Loader Storage Area LIBSECT: CMS PDS Header ••• 202 LIBSECT: CMS PDS Header (5748-XE1) ••• 202 LUBTAB and LUBPR: Logical Unit Block
Table ••••••••••••••••• 202 LUBTAB and LUBPR: Logical Unit Block
Table (.2748-XX8) ••••••• LUBTAB and LUBPR: Logical Unit Block .202.1 Table(5748-XEi) • • • • • • • • .202.1 NICL: Number in Class. • • • • .204 NUCON: Nucleus Constant Area. • • .205 OPSECT: Major CSECT for all I/O Operation Lists. • • • • • • • • .219 OSFST: OS File Status Table ••••••• 222 OVSECT: Describes the First Few
Locations of DMSOVS • • • • • •• .224 PCTAB: Program Check Option Table •••• 224 PDSSECT: Directory Table for BPAM simUlation. • • • • • • • • • • • .225 PGMSECT: Program Interrupt Work Area •• 226 PIBADR: Program Information Block. .227
PIB2TAB: Program Information Block Extension. • . . . . . • . . .. .228 PUBADR: Physical Unit Block Table. .229 P{JBQWNER: Physical Unit Bleck Ownership· Table • • • • • • • • • • .230 SSAVE: System Save Area. • • • •• .231 SUBSECT: Subset Work Area. • • • • SVCSECT: SVC Interrupt Storage • • SVEARA: LTA and PP Save Area DSECT SYSCOM: System Communication Region •• SYSNAMES: Saved Systems Names •• TLBBLOK: Tape Label Processing
.233
.234
.238 • 239
.242
Information (2148-XX8) ••••• TLBBLOK: Tape Label Processing
.242.1
Information (2148-XE1) ••• TSOBLKS: TSO Control Blocks ••• USAVE: User Save Area. • • .242.1
.243
.245 USERSECT: User Work Area • • • • • .245 SECTION 3. RSCS DATA AREAS AND CONTROL BLOCKS. • • • • • • • •• •••• .247 ASYNE: Asynchronous Exit Element • • • .248 BUFDSECT: SML Telecommunications Buffer.249 COMDSECT: Address Constants as Pointers.250 DEVTABLE: NPT Device Table • • • • • • .251
FREEE: A Free Element on the Supervisor Element Queue • • • • .252 GIVE Request Table • • .253 GIVEE: A GIVE Element. • •••• 253 IOE: An I/O Element. • • •••• 254 rOTABLE: An 1/0 Table. .255
LINKTABL: Link Table • • • .256 REQBLOCK: NPT Request Block. • • .258 ROUTE: Routing Table Entry • .259 SVECTORS: Low Storage Definitions. .260 TAG: RSCS File Descriptor. • • • .263
TAGAREA. • • • • • • • • • • • • .265
TAKE Request Table ••••••••••• 265 TANKDSEC: SML Unit Record Tank • .266
TAREA: A Task Save Area. • • • • .267 TASKE: A Task Element •••••••••• 269 TCTDSECT: Task Control Table • .270 APPENDIXES • • • • • • • • • • .273 APPENDIX A. CP and RSCS EQUATE SYMBOLS .275 VM/370 Device Classes, Types, Models,
and Features. • • • • • • • • • .276 VM/370 Equate Symbols -- Machine Usage • • • • • • • • • • • • •• .278 VM/370 Equate Symbols -- Machine Usage • • • • • •• .278.1 VM/370 Equate Symbols -- Machine Usage • • • • • •• .278.1 VM/370 Equate Symbols -- Extended
Control Registers • • • • • • • • .279 VM/370 Equate SymbolR -- CP rysage. .280 VM/370 Equate Symbols -- CP Usage 7 4 ,§- X X 8). • • • • • • • • • • • • • 2 80 • 1 VM/370 Equate Symbols -- CP Usage (5748-XE1). • • • • • •• • ••• 280.1 VM/370 Registers • • • • • • • • .283 APPENDIX B. RSCS CONTROL AREAS • .285 AXS Monitor Control Area .286
Contents vii