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Programming Interface Information:
This page documents intended Programming
Interfaces that allow the customer to write programs to obtain the services of VM/ESA. |
VRDCBLOK
Cross Reference (Contains links to field and bit definitions)
VRDCBLOK Prolog
NAME : VRDCBLOK
DESCRIPTION: VIRTUAL/REAL DEVICE CHARACTERISTICS BLOCK
DSECT : VRDCBLOK
FUNCTION : THE VRDCBLOK CONTAINS 80 BYTES OF VIRTUAL AND
REAL DEVICE INFORMATION, AS WELL AS VIRTUALIZED
READ DEVICE CHARACTERISTICS DATA.
LOCATED BY : USAGE DEPENDENT
CREATED BY : HCPDVTDC
DELETED BY : USAGE DEPENDENT
COMMENTS : ANY CHANGES TO THE FORMAT OF HARDWARE READ
DEVICE CHARACTERISTICS DATA SHOULD BE REFLECTED
TO THIS CONTROL BLOCK
VRDCBLOK Control Block Content
VRDCBLOK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure VRDCBLOK VIRTUAL/REAL DEVICE CHARACTERISTICS BLOCK 0000 0 Bitstring 2 VRDCDVNO VIRTUAL DEVICE ADDRESS 0002 2 Bitstring 2 VRDCLEN VRDCBLOK LENGTH 0004 4 Bitstring 4 VRDCVDAT (0) VIRTUAL DEVICE DATA 0004 4 Bitstring 2 VRDCVCOD (0) VIRTUAL DEVICE CODE 0004 4 Bitstring 1 VRDCVCLA R*1 VIRTUAL DEVICE CLASS 0005 5 Bitstring 1 VRDCVTYP R*2 VIRTUAL DEVICE TYPE 0006 6 Bitstring 1 VRDCVSTA R*3 VIRTUAL DEVICE STATUS 0007 7 Bitstring 1 VRDCVFLA R*4 VIRTUAL DEVICE FLAG 0008 8 Bitstring 4 VRDCRCDT (0) REAL DEVICE DATA 0008 8 Bitstring 2 VRDCRCCO (0) REAL DEVICE CODE 0008 8 Bitstring 1 VRDCRCCL R*5 REAL DEVICE CLASS 0009 9 Bitstring 1 VRDCCRTY R*6 REAL DEVICE TYPE 000A 10 Bitstring 1 VRDCCRMD R*7 REAL DEVICE MODEL 000B 11 Bitstring 1 VRDCRLLE (0) REAL DEVICE LINE LENGTH 000B 11 Bitstring 1 VRDCCRFT R*8 REAL DEVICE FEATURE 000C 12 Bitstring 4 VRDCRSVD RESERVED: MUST BE ZEROES CKD/ECKD dasd Read Device Characteristics (RDC) mapping (most other devices are similarly mapped) 0010 16 Bitstring 64 VRDCSTRT (0) START OF THE RDC DATA BYTES 0010 16 Bitstring 2 VRDCCUTY CONTROL UNIT TYPE 0012 18 Bitstring 1 VRDCCUMD R*9 CONTROL UNIT MODEL 0013 19 Bitstring 2 VRDCDVTY DEVICE TYPE 0015 21 Bitstring 1 VRDCDVMD R*10 DEVICE MODEL 0016 22 Bitstring 4 VRDFEAT (0) DEVICE / STORAGE DIR. FEATURES 0016 22 Bitstring 3 VRDCDVFE RESERVED FOR FUTURE IBM USE 0019 25 Bitstring 1 VRDCSDFE R*11 SUBSYTEM FEATURES SUPPORTED 001A 26 Bitstring 1 VRDCDVCL R*12 DEVICE CLASS CODE 001B 27 Bitstring 1 VRDCDVCO R*13 DEVICE TYPE CODE 001C 28 Bitstring 28 VRDDEVF1 (0) DEVICE SPECIFIC FIELD 1 001C 28 Signed 2 VRDCPRIM NUMBER OF PRIMARY CYLINDERS 001E 30 Signed 2 VRDCTRKC TRACKS PER CYLINDER 0020 32 Bitstring 1 VRDCSECT R*14 NUMBER OF SECTORS 0021 33 Bitstring 3 VRDCTOTR TOTAL USABLE TRACK LINGTH 0024 36 Bitstring 2 VRDCHA LENGTH FOR HA AND R0 0026 38 Bitstring 1 VRDCMODE R*16 TRACK-CAPACITY CALCULATION MODE 0027 39 Bitstring 5 VRDMDFR (0) TRACK-CAP CALCULATION FACTORS 0027 39 Bitstring 1 VRDCMDFR R*17 TRACK CAPACITY CALCULATION CHGNED 0028 40 Signed 2 VRDCNKOV NON-KEYED RECORD OVERHEAD 002A 42 Signed 2 VRDCKOVH KEYED AREA OVERHEAD 002C 44 Signed 2 VRDCALTC ADDRESS OF FIRST ALTERNATE CYL 002E 46 Signed 2 VRDCALTR NUMBER OF ALTERNAME TRACKS 0030 48 Signed 2 VRDCDIG ADDRESS OF DIAGNOSTIC CYLINDER 0032 50 Signed 2 VRDCDIGN NUMBER OF DIAGNOSTIC TRACKS 0034 52 Signed 2 VRDCDVCY ADDRESS OF FIRST DEVICE CYLINDER 0036 54 Signed 2 VRDCDVTR NUMBER OF DEVICE SUPPORT TRACKS 0038 56 Bitstring 1 VRDCMDR R*18 MDR RECORD ID 0039 57 Bitstring 1 VRDCOBR R*19 OBR RECORD ID 003A 58 Bitstring 22 VRDDEVF2 (0) DEVICE SPECIFIC FIELD 2 003A 58 Bitstring 1 VRDCCUID R*20 CONTROL UNIT ID 003B 59 Bitstring 1 * (21) RESERVED 00000040 VRDCLNGC *-VRDCSTRT SIZE OF VRDC DATA FOR CKD DEVICE 0000000A VRDCSIZE (*-VRDCBLOK)/8 SIZE OF VRDCBLOK IN DOUBLEWORDS FBA dasd Read Device Characteristics (RDC) mapping *** BYTES DEFINED FOR FBA DEVICE IN VRDCSTRT 0010 16 Bitstring 32 VRDCFBA (0) ALL 32 RDC BYTES 0010 16 Bitstring 1 VRDCOPER DEVICE OPERATION MODES 0011 17 Bitstring 1 VRDCFBAF FBA DEVICE FEATURES 0012 18 Bitstring 1 VRDCFBAC FBA DEVICE CLASS 0013 19 Bitstring 1 VRDCFBAT FBA DEVICE TYPE 0014 20 Bitstring 28 VRDFBAD1 (0) - 0014 20 Bitstring 2 VRDCRCSZ PHYSICAL RECORD SIZE 0016 22 Bitstring 4 VRDCBKCG BLOCKS PER CYCLICAL GROUP (TRACK) 001A 26 Bitstring 4 VRDCBKAP BLOCKS PER ACCESS POSITION 001E 30 Bitstring 4 VRDCBKMA BLOCKS UNDER MOVABLE ACCESS 0022 34 Bitstring 4 VRDCBKFA BLOCKS UNDER FIXED ACCESS 0026 38 Bitstring 2 VRDCBKAA BLOCKS IN ALTERNATE AREA 0028 40 Bitstring 2 VRDCBKCE BLOCKS IN CE AREA 002A 42 Bitstring 2 VRDCBFLG NUMBER OF BUFFERED LOG BYTES 002C 44 Bitstring 2 VRDCATMI MINIMUM ACCESS TIME 002E 46 Bitstring 2 VRDCATMA MAXIMUM ACCESS TIME 003A 58 Bitstring 22 VRDFBAD2 - Tape Read Device Characteristics (RDC) mapping *** BYTES DEFINED FOR TAPE IN VRDDEVF1 001C 28 Bitstring 28 VRDTAPE1 TAPE SPECIFIC RESERVED *** BYTES DEFINED FOR TAPE IN VRDDEVF2 003A 58 Bitstring 22 VRDTAPE2 TAPE SPECIFIC RESERVED
VRDCBLOK Storage Layout
*** VRDCBLOK - VIRTUAL/REAL DEVICE CHARACTERISTICS BLOCK * * +-------------+-------------+------+------+------+------+ * 0 | VRDCDVNO | VRDCLEN |:CVCLA|:CVTYP|:CVSTA|:CVFLA| * +------+------+------+------+------+------+------+------+ * 8 |:CRCCL|:CCRTY|:CCRMD|:CCRFT| VRDCRSVD | * +------+------+------+------+------+------+-------------+ * 10 | VRDCCUTY |:CCUMD| VRDCDVTY |:CDVMD| VRDCDVFE- | * +------+------+------+------+------+------+-------------+ * 18 |-(016)|:CSDFE|:CDVCL|:CDVCO| VRDCPRIM | VRDCTRKC | * +------+------+------+------+-------------+------+------+ * 20 |:CSECT| VRDCTOTR | VRDCHA |:CMODE|:CMDFR| * +------+------+-------------+-------------+------+------+ * 28 | VRDCNKOV | VRDCKOVH | VRDCALTC | VRDCALTR | * +-------------+-------------+-------------+-------------+ * 30 | VRDCDIG | VRDCDIGN | VRDCDVCY | VRDCDVTR | * +------+------+------+------+-------------+-------------+ * 38 |:CMDR |:COBR |:CCUID|//////////////////////////////////| * +------+------+------+//////////////////////////////////| * |///////////////////////////////////////////////////////| * |///////////////////////////////////////////////////////| * +-------------------------------------------------------+ * 50 * *** VRDCBLOK - VIRTUAL/REAL DEVICE CHARACTERISTICS BLOCK *** Overlay for VRDCSTRT in VRDCBLOK * * +------+------+------+------+-------------+-------------+ * 10 |:COPER|:CFBAF|:CFBAC|:CFBAT| VRDCRCSZ | VRDCBKCG- | * +------+------+------+------+-------------+-------------+ * 18 | -(016) | VRDCBKAP | VRDCBKMA- | * +-------------+---------------------------+-------------+ * 20 | -(01E) | VRDCBKFA | VRDCBKAA | * +-------------+-------------+-------------+-------------+ * 28 | VRDCBKCE | VRDCBFLG | VRDCATMI | VRDCATMA | * +-------------+-------------+-------------+-------------+ * 30 * *** Overlay for VRDCSTRT in VRDCBLOK *** Overlay for VRDDEVF2 in VRDCBLOK * * +-----------------------------------------+ * 38 ... 3A | | * +-------------+ | * | VRDFBAD2 | * | | * +-------------------------------------------------------+ * 50 * *** Overlay for VRDDEVF2 in VRDCBLOK *** Overlay for VRDDEVF1 in VRDCBLOK * * +---------------------------+ * ... 1C | | * +---------------------------+ | * 20 | | * = VRDTAPE1 = * | | * +-------------------------------------------------------+ * 38 * *** Overlay for VRDDEVF1 in VRDCBLOK *** Overlay for VRDDEVF2 in VRDCBLOK * * +-----------------------------------------+ * 38 ... 3A | | * +-------------+ | * | VRDTAPE2 | * | | * +-------------------------------------------------------+ * 50 * *** Overlay for VRDDEVF2 in VRDCBLOK
VRDCBLOK Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----VRDCALTC 002C
VRDCALTR 002E
VRDCATMA 002E
VRDCATMI 002C
VRDCBFLG 002A
VRDCBKAA 0026
VRDCBKAP 001A
VRDCBKCE 0028
VRDCBKCG 0016
VRDCBKFA 0022
VRDCBKMA 001E
VRDCCRFT 000B
VRDCCRMD 000A
VRDCCRTY 0009
VRDCCUID 003A
VRDCCUMD 0012
VRDCCUTY 0010
VRDCDIG 0030
VRDCDIGN 0032
VRDCDVCL 001A
VRDCDVCO 001B
VRDCDVCY 0034
VRDCDVFE 0016
VRDCDVMD 0015
VRDCDVNO 0000
VRDCDVTR 0036
VRDCDVTY 0013
VRDCFBA 0010
VRDCFBAC 0012
VRDCFBAF 0011
VRDCFBAT 0013
VRDCHA 0024
VRDCKOVH 002A
VRDCLEN 0002
VRDCLNGC 003B 00000040
VRDCMDFR 0027
VRDCMDR 0038
VRDCMODE 0026
VRDCNKOV 0028
VRDCOBR 0039
VRDCOPER 0010
VRDCPRIM 001C
VRDCRCCL 0008
VRDCRCCO 0008
VRDCRCDT 0008
VRDCRCSZ 0014
VRDCRLLE 000B
VRDCRSVD 000C
VRDCSDFE 0019
VRDCSECT 0020
VRDCSIZE 003B 0000000A
VRDCSTRT 0010
VRDCTOTR 0021
VRDCTRKC 001E
VRDCVCLA 0004
VRDCVCOD 0004
VRDCVDAT 0004
VRDCVFLA 0007
VRDCVSTA 0006
VRDCVTYP 0005
VRDDEVF1 001C
VRDDEVF2 003A
VRDFBAD1 0014
VRDFBAD2 003A
VRDFEAT 0016
VRDMDFR 0027
VRDTAPE1 001C
VRDTAPE2 003A
Last updated on 3 Aug 1999 at 13:52:50 EDT.
Copyright IBM Corporation, 1990, 1999