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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 z/VM. |
VRDCBLOK
Control Block Contents
VRDCBLOK DSECT
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 1 VRDCUNDV UNDERLYING DEVICE CODE FOR
DEVICES THAT EMULATE OTHER DEVICE
TYPES. VALID ONLY FOR CLASTAPE
DEVICES. ZERO FOR ALL OTHER
DEVICE CLASSES. VRDCUNDV Values
for CLASTAPE devices
.... .... VRDCTNAT X'00' Native non-emulation drive
.... ...1 VRDCT120 X'01' 3590 128-TRK drive (B1A or
B11) attached to 3590 A00/A50/A60
control unit, emulating 3490E
.... ..1. VRDCTVTS X'02' 3490E virtual drive in a
3494 VTS tape library
.... ..11 VRDCT121 X'03' 3590 128-TRK drive (B1A or
B11) attached to 3591 control
unit, emulating 3490E
.... 1..1 VRDCT255 X'09' 3590 256-TRK drive (E1A or
E11) attached to 3590 A00/A50/A60
control unit, emulating 3590 B1A
or B11
.... 1.1. VRDCT254 X'0A' 3590 256-TRK drive (E1A or
E11) attached to 3590 A00/A50/A60
control unit, emulating 3490E
1111 1111 VRDCTUNK X'FF' Unknown emulation drive
000D 13 Bitstring 3 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
0050 80 Bitstring 11 VRDCPGID Real Path Group ID
005B 91 Bitstring 5 * Reserved
00000050 VRDCLNGC *-VRDCSTRT SIZE OF VRDC DATA FOR
CKD DEVICE
0000000C VRDCSIZE (*-VRDCBLOK+7)/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 -
0050 80 Bitstring 16 * Reserved
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
0050 80 Bitstring 16 * Reserved
VRDCBLOK Storage Layout
*** VRDCBLOK - VIRTUAL/REAL DEVICE CHARACTERISTICS BLOCK
*
* +-------------+-------------+------+------+------+------+
* 0 | VRDCDVNO | VRDCLEN |:CVCLA|:CVTYP|:CVSTA|:CVFLA|
* +------+------+------+------+------+------+------+------+
* 8 |:CRCCL|:CCRTY|:CCRMD|:CCRFT|:CUNDV| 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 | VRDCPGID |
* | +----------------------------------+
* 58 | |//////////////////////////////////|
* +--------------------+----------------------------------+
* 60
*
*** 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 |///////////////////////////////////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 60
*
*** 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 |///////////////////////////////////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 60
*
*** Overlay for VRDDEVF2 in VRDCBLOK
VRDCBLOK Cross Reference
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 005B 00000050 VRDCMDFR 0027 VRDCMDR 0038 VRDCMODE 0026 VRDCNKOV 0028 VRDCOBR 0039 VRDCOPER 0010 VRDCPGID 0050 VRDCPRIM 001C VRDCRCCL 0008 VRDCRCCO 0008 VRDCRCDT 0008 VRDCRCSZ 0014 VRDCRLLE 000B VRDCRSVD 000D VRDCSDFE 0019 VRDCSECT 0020 VRDCSIZE 005B 0000000C VRDCSTRT 0010 VRDCTNAT 000C 00 VRDCTOTR 0021 VRDCTRKC 001E VRDCTUNK 000C FF VRDCTVTS 000C 02 VRDCT120 000C 01 VRDCT121 000C 03 VRDCT254 000C 0A VRDCT255 000C 09 VRDCUNDV 000C 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 6 Jun 2001 at 12:54:05 EDT.
Copyright IBM Corporation, 1990, 2001