DBCWK Back to Index page
 
Prolog 
Control Block Contents 
   DBCWK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  DBCWK Prolog Top of page
 
 NAME       : HCPDBCWK
 DESCRIPTION: DASD Block I/O work block
 DSECT      : DBCWK
 FUNCTION   : Contains information specific to DASD block
              I/O requests.  It is basically a work area
              for HCPDBC and it is also now used as the control
              block to represent the current state of a
              particular Diagnose 250 or *BLOCKIO (request).
              (The SNDBK and BRQBK used to fulfill these
              roles, any fields in those control blocks
              now reside here).
              Since a number fields are specific to the particular
              i/o request, there is an overlay portion of this control
              block at label DBCSPECL.  The overlays are defined in
              here and there is an overlay for each type of i/o.
 LOCATED BY : This is pointed to by R13 in all of the
              block i/o handlers (HCPBIM, HCPBIR, HCPDGB
              HCPBID, HCPDGD, HCPDBC and HCPDBD).
 CREATED BY : HCPDGB (Diag A4 handling)
              HCPBIM (*BLOCKIO handling)
              HCPBID (Diag 250 handling)
              HCPDGD (Diag 18  handling)
 DELETED BY : HCPDGB (Diag A4 handling)
              HCPBIM (*BLOCKIO handling)
              HCPBID or HCPBIR (Diag 250 handling)
              HCPDGD (Diag 18  handling)
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : The DBCWK area contains one BPLBK (DBCSINGL) and one
              IPARML Reply (DBCPARML).  If the size of either of
              these control blocks changes, then DBCSINGL and
              DBCPARML should be updated accordingly.
 
 
  DBCWK Control Block Content Top of page
 

 DBCWK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DBCWK DASD Block I/O work block 0000 0 Dbl-Word 8 * (64) Space for standard saveBK 0200 512 Dbl-Word 8 DBCIASIT I-ASIT for the SBIOP/SBILIST/BPLBK and guest buffers. Work area can be used as a temporary save area by any routine that needs to save something temporarily. The general rule of thumb is that a value stored in DBCWORK is only used within the subroutine that stored it there, any exceptions to this rule are noted in the code. 0208 520 Dbl-Word 8 DBCWORK (0) Temporary work area 0208 520 Signed 4 DBCWORK1 Work word 1 020C 524 Signed 4 DBCWORK2 Work word 2 0210 528 Signed 4 DBCWORK3 Work word 3 0214 532 Signed 4 DBCWORK4 Work word 4 The following 4 bytes (1 word) are used to hold various processing bits common to all types of block i/o. 0218 536 Bitstring 1 DBCSWTCH Flags for processing control 1... .... DBCGOOD X'80' At least one good i/o .1.. .... DBCNSTD X'40' Nonstandard block size ..1. .... DBCNOCAR X'20' No caching requested ...1 .... DBCWRITE X'10' Type of I/O 1 for read, 0 for write .... 1... DBCCACC X'08' Cache access held .... .1.. DBCINCAC X'04' This I/O operation is no longer eligible for caching .... ..1. DBCARMOD X'02' In AR Mode .... ...1 DBCPRIM X'01' Parameter list in primary 0219 537 Bitstring 1 DBCSWTC2 More flags for processing 1... .... DBCNOTEL X'80' DBCNOTEL Not eligible for cache .1.. .... DBCBLKER X'40' DBCBLKER Found block in error ..1. .... DBCREPLP X'20' DBCREPLP Must replace Parm List ...1 .... DBCCOPYP X'10' DBCCOPYP Made copy of Parm list .... 1... DBCASYNC X'08' DBCASYNC Asynchronous blockio .... .1.. DBCDG250 X'04' DBCDG250 DIAG 250 i/o .... ..1. DBCBLKIO X'02' DBCBLKIO *BLOCKIO i/o .... ...1 DBCDGA4 X'01' DBCDGA4 DIAGA4 i/o DBCGKEY has key for storage protection checks 021A 538 Bitstring 1 DBCGKEY Storage key 021B 539 Bitstring 1 DBCSWTC4 More processing bits 1... .... DBCGLDEL X'80' DBCGLDEL All track deletion req. .1.. .... DBCNOREL X'40' DBCNOREL Don't release on read ..1. .... DBCRDCPY X'20' DBCRDCPY Read access must copy data ...1 .... DBCARGST X'10' DBCARGST Guest in AR mode .... 1... DBCSAWWR X'08' DBCSAWWR At least 1 write in req. .... .1.. DBCWFAIL X'04' DBCWFAIL At least 1 write failed .... ..1. DBCXSTOR X'02' DBCXSTOR Cache block on XSTOR .... ...1 DBCDIDIO X'01' DBCDIDIO Did I/O for this request 021C 540 Signed 4 DBCSAV original SAVBK address The DBCHALET is used for the block list control block for the particular type of block i/o request. 0220 544 Signed 4 DBCHALET ALET for guest space (CP) 0224 548 Signed 4 DBCEALET Guest version of ALET. 0228 552 Signed 4 DBCERET Return address save 022C 556 Signed 4 DBCERET2 2'nd level return address save 0230 560 Signed 4 DBCDPSBK DPSBK Address 0234 564 Signed 4 DBCANCHR BIOPG page list anchor The following fields used to be in a separate control block called a DVCPL. They are now placed here to avoid having to load up its address all the time. 0238 568 Signed 4 DBCHFRST Beginning of DVIENTRY linked list 023C 572 Signed 4 DBCHLAST End of DVIENTRY linked list 0240 576 Address 4 DBCOPPTR Beginning of DVIOP linked list 0244 580 Signed 4 DBCTFRST DVTRK (tracks accessed) list 0248 584 Address 4 DBCLCKAD Address of lock word 024C 588 Signed 4 DBCMAXCH Max channel program size 0250 592 Signed 4 DBCKEY Key save area 0254 596 Signed 4 * Reserved for future IBM use 0258 600 Dbl-Word 8 DBCBKNUM Block number save area 0260 608 Signed 4 DBCDVC DBC/DBE - ptr to DVIENTRY DGB/DGD - ptr to DVIOP 0264 612 Signed 4 DBCTKPTR Pointer to previous DVTRK 0268 616 Signed 4 DBCRTRAK Relative track save area 026C 620 Signed 4 DBCTCHBK Last Read TCHBK Addr 0270 624 Signed 4 DBCMXENT Max entry count 0274 628 Signed 4 DBCERRAD Address where a host storage error occurred on parameter list. The following fields are the CDATA word and the DPSBK information from the currently-in-use track, by that we mean that it is the one we will next try to copy data to/from. 0278 632 Signed 4 DBCTKDAT (0) Data for current track 0278 632 Signed 4 DBCCDATA (0) TCHBK save 0278 632 Signed 2 DBCVCYL Virtual cylinder 027A 634 Bitstring 1 DBCFSTRN First record number 027B 635 Bitstring 1 DBCLOWRN Low record number 027C 636 Signed 4 * (0) 027C 636 Bitstring 1 * Reserved for IBM use 027D 637 Bitstring 3 DBCDPSTF (0) DPSBK stuff we care about 027D 637 Bitstring 1 DBCHIRN Highest record number 027E 638 Signed 2 DBCTKSIZ Blocksize of track 00000002 DBCTKLEN (*-DBCTKDAT+3)/4 Size in words of track data The following field is the read copy of the data. We only have 1 read track accessed at any given time, yet for *BLOCKIO and DIAG 250 we may have mixed reads and writes. So if we get write access to a track, then we copy the read data to this temporary save area. Then, if we later read from the current read track, then we can just copy the data back instead of going through a re-access of the track. 0280 640 Signed 4 DBCRDSAV (2) Read save area 0288 648 Signed 4 DBCBLKCT Remember block count 028C 652 Signed 4 DBCRC Return code save area 0290 656 Signed 2 DBCBLKSZ Block size 0292 658 Signed 2 DBCHSID Hash id for cache 0294 660 Signed 2 DBCOFSET OFFSET into track 0296 662 Signed 2 DBCDBICT Count of DBIRQ blocks sent to HCPIOS 0298 664 Signed 4 DBCDVIAD Pointer to next DVIOP to schedule for these i/o oper. 029C 668 Address 4 DBCNEXT Pointer to next DBCWK for this virtual device 02A0 672 Signed 4 DBCRELRT Release return address 02A4 676 Signed 4 DBCMALET ALET FOR MDC address space for last track accessed 02A8 680 Signed 4 * (0) 02A8 680 Bitstring 1 DBCSWTC5 More processing bits 1... .... DBCDG18 X'80' DBCDG18 Processing a Diag X'18' 02A9 681 Bitstring 1 * Reserved for IBM use 02AA 682 Signed 2 DBCTMPH Tempary half word savearea 02AC 684 Signed 4 * Reserved for IBM use 02B0 688 Dbl-Word 8 DBCSPECL (0) 02B0 688 Dbl-Word 8 * (10) Overlay area, note that this leaves room for service. 00000060 DBCWKLEN (*-DBCWK+7)/8 Size in double words DIAGNOSE 18 Specific fields Are overlayed at label DBCSPECL. 02B0 688 Dbl-Word 8 DBCSVCCW Host copy of CCW DBCARGSV has BBCCHH of first SEEK in CCW program and the relocated CC address for the minidisk. 02B8 696 Dbl-Word 8 DBCARGSV (0) First SEEK arguments 02B8 696 Signed 2 DBCARGBB BB portion of seek 02BA 698 Signed 2 DBCARGCC CC portion of seek DBCARGCC DBCARCCH 00004 DBCARGCC,4 ccccCCCH of seek 02BC 700 Signed 2 DBCARGHH HH portion of seek 02BE 702 Signed 2 * Reserved for IBM use 02C0 704 Signed 4 DBCCYLSV Relocated CC of seek 02C4 708 Signed 4 * Reserved for IBM use DBCNXTSV has BBCCHH of latest SEEK in CCW program 02C8 712 Dbl-Word 8 DBCNXTSV (0) Latest SEEK arguments 02C8 712 Signed 2 DBCNXTBB BB portion of seek 02CA 714 Signed 2 DBCNXTCC CC portion of seek DBCNXTCC DBCNXCCH 00004 DBCNXTCC,4 ccccCCCH of seek 02CC 716 Signed 2 DBCNXTHH HH portion of seek 02CE 718 Signed 2 * Reserved for IBM use DBCORIEN has the latest record orientation information in it. It has the CCHHR of the last record that we read from the cache. 02D0 720 Bitstring 5 DBCORIEN (0) Latest SIDE arguments 02D0 720 Signed 2 DBCORICC CC of SIDE DBCORICC DBCORCCH 00004 DBCORICC,4 ccccCCCH of SIDE 02D2 722 Signed 2 DBCORIHH HH of SIDE 02D4 724 Bitstring 1 DBCORIR R of SIDE 02D5 725 Bitstring 1 DBC18SWT More flags 1... .... DBCFIRST X'80' DBCFIRST Working on first CCW .1.. .... DBCBUSYV X'40' DBCBUSYV Made the VDEV busy ..1. .... DBCSILI X'20' DBCSILI SILI bit on ...1 .... DBCMIXED X'10' DBCMIXED Mixed blocksizes found .... 1... DBCREMOV X'08' DBCREMOV Can remove DVIENTRYs .... .1.. DBCSTD X'04' DBCSTD Track is standard .... ..1. DBCEOT X'02' DBCEOT Reached End of Track 02D6 726 Signed 2 DBCMAXSZ Max block size found 02D8 728 Signed 4 DBCIORAD IORBK save address 02DC 732 Signed 4 DBCGCCW Guest CCW Address 02E0 736 Signed 4 DBCCCWCT CCW count 02E4 740 Signed 4 DBCCYLTK Relative track for cyl 02E8 744 Signed 4 DBCSEKPT Last SearchID DVIENTRY 02EC 748 Signed 4 DBCCPSPT Last C.P.S. Pointer 02F0 752 Signed 4 DBCTKHED Track pointer 02F4 756 Signed 4 DBC18RC Diag 18 return code 02F8 760 Signed 4 * (2) Reserved for IBM use DIAGNOSE A4 Specific fields Are overlayed at label DBCSPECL. 02B0 688 Bitstring 1 DBCA4SWT More flags 1... .... DBCVDEV X'80' DBCVDEV Got the VDEV lock to be copied back to guest storage. .1.. .... DBCBUSY X'40' DBCBUSY We turned on VDEVBUSY ..1. .... DBCREPS X'20' DBCREPS SBIOP must be replaced on exit ...1 .... DBCFORMT X'10' DBCFORMT Request type format .... 1... DBCINIOR X'08' DBCINIOR Initialized IORBK .... .1.. DBCCOPYS X'04' DBCCOPYS SBIOP was copied to host stor .... ..1. DBCQDSK X'02' DBCQDSK Have Vdisk I/O lock .... ...1 DBCBKOUT X'01' DBCBKOUT End-user breakout enabled 02B1 689 Bitstring 1 DBCARNUM ARx access register 02B2 690 Bitstring 1 DBCLPM Guest LPM 02B3 691 Bitstring 1 * Reserved for IBM use 02B4 692 Signed 4 DBCAR9 Save for current ALET 02B8 696 Signed 4 DBCPROG Prog check operand 02BC 700 Signed 4 DBCIORBK IORBK save address 02C0 704 Signed 4 DBCBLKPR Blocks processed 02C4 708 Signed 4 DBCSBIOP Address of SBIOP 02C8 712 Signed 4 DBCGADDR Guest addr of SBIOP 02CC 716 Signed 4 * Reserved for IBM use 02D0 720 Signed 4 DBCGLIST SBILIST guest address 02D4 724 Signed 4 * (11) Reserved for IBM use DIAGNOSE A4 Format specific fields are overlayed at label DBCGLIST. 02D0 720 Dbl-Word 8 DBCFBLKS SBIFBLKS 02D8 728 Dbl-Word 8 DBCDIDBK SBIDIDBK 02E0 736 Dbl-Word 8 DBCFDATA SBIFDATA 02E8 744 Dbl-Word 8 DBCLBA SBILBA 02F0 752 Signed 4 * (4) Reserved for IBM use DIAGNOSE 250 Specific fields are overlayed at label DBCSPECL. The following is an address space buffer. It holds the latest address space info on a guest buffer specified in the BELBK entry. I.E. It holds the latest BELBALET and the associated things that we care about. A non-zero entry indicates that we have access to the data space containing the buffer. A zero entry means that there is no address space attached for a given BELBK entry. 02B0 688 Dbl-Word 8 DBCBASIT BELBK I-asit Address 02B8 696 Signed 4 DBCBKIBK BKIBK address 02BC 700 Address 4 DBCHALBK Address of the host-ART lookaside block containing the ALET/i-ASIT pairs associated with the data buffers in the BELBK entries. 02C0 704 Bitstring 1 DBCDOPER Operation field for the DIAG X'250' request 1... .... DBCABSET X'80' Abort exit was established .1.. .... DBCABORT X'40' Abort exit was driven ..1. .... DBCASYRQ X'20' Guest requested asynchronous processing. ...1 .... DBCBYPAS X'10' Guest requested that we bypass minidisk cache .... 1... DBCBELST X'08' The BELBK could not be stored for the completion of an asynchronous request. .... .1.. DBC64BIT X'04' Diag 250 guest used large fields in BIOPL and BELBK. 02C1 705 Bitstring 1 DBCFLAGS More processing flags 1... .... DBCBELGT X'80' DBCBELGT Used GETST to get BELBK .1.. .... DBCGTHAL X'40' DBCGTHAL Used GETST to get HALBK 02C2 706 Bitstring 1 DBC250RC Return code for request processing .... .... DBCRC00 X'00' A synchronous request was successful (either scheduled and completed, or from cache) or an asynchronous request was successfully satisfied from cache. .... 1... DBCRC08 X'08' An asynchronous request was initiated (all or part of the I/O was scheduled). .... 11.. DBCRC12 X'0C' A request was partially successful. If asynchronous, part of the request was satisfied from cache, but an error occurred preventing the entire request from completing successfully. ..1. 1... DBCRC40 X'28' All of the BELBK entries were in error, or all DVIOPs were in error. ..1. 11.. DBCRC44 X'2C' Remove or reset terminated a synchronous request. ..11 .... DBCRC48 X'30' A synchronous request was terminated by the user (the abort exit was driven). 1111 1111 DBCRC255 X'FF' A catastrophic error (abend condition) occurred. Some I/O may have been scheduled or done. 02C3 707 Bitstring 1 * Reserved for IBM use 02C4 708 Signed 2 DBCBELCT Number of entries in the block I/O entry list 02C6 710 Signed 2 * Reserved for IBM use 02C8 712 Signed 4 * Reserved for IBM use 02CC 716 Address 4 DBCBELBK 31 bit host logical address of the block I/O entry list. 02D0 720 Address 8 DBCGBELA 64 bit guest absolute address of the block I/O entry list. 02D8 728 Dbl-Word 8 DBCIPARM (0) Interruption parameter, if this is an asynchronous request. 02D8 728 Signed 4 * High half of 64 bit PARM 02DC 732 Signed 4 DBCIPARM32 Low half of 64 bit PARM or 32 bit PARM 02E0 736 Dbl-Word 8 DBCOFFCP Offset for block number - this is a copy of BKIOFFCP 02E8 744 Signed 4 * (6) Reserved for IBM use **BLOCKIO Specific fields are overlayed at label DBCSPECL. DBCSINGL contains a BPLBK, so any changes to the BPLBK size affect this field. NOTES : Currently the BPLBK is 4F, but the last 1F is unused, so using 3F for DBCSINGL works (and is all we can fit in DBCSPECL at this time). 02B0 688 Signed 4 DBCSINGL (3) Storage for a single block I/O version of the multiple block I/O parameter list Mapped by HCPBPLBK 02BC 700 Signed 4 DBCBLKAD BLKIO address 02C0 704 Bitstring 1 DBCBOPER Operation field for SEND Request 1... .... DBCMONO X'80' DBCMONO Indicate Single BLK SEND REQ Protocol .1.. .... DBCMULTI X'40' DBCMULTI Indicate Multi BLK SEND REQ Protocol ..1. .... DBCIWAIT X'20' DBCIWAIT Indicate waiting for I/O interrupts ...1 .... DBCSYNC X'10' DBCSYNC Guest request is synchronous .... 1... DBCGOTBL X'08' DBCGOTBL got storage for blockio list .... .1.. DBCSEXIT X'04' DBCSEXIT Exitted to caller already DBCBLKRC codes are defined in HCPBIM 02C1 705 Bitstring 1 DBCBLKRC IUCV Reply Return Code 02C2 706 Signed 2 DBCSSHCT Number of real SSCH issued to handle this send request. 02C4 708 Signed 4 DBCMSGID IUCV message id 02C8 712 Signed 4 DBCTRGCL (0) IUCV target class 02C8 712 Bitstring 3 * IUCV target class 02CB 715 Bitstring 1 DBCBLKRQ Blockio service request 1... .... DBCBLKNC X'80' DBCBLKNC Bypass MDC processing .... ..11 DBCBLKMB X'03' DBCBLKMB Multi-block request .... ..1. DBCBLKRD X'02' DBCBLKRD Single block read .... ...1 DBCBLKWR X'01' DBCBLKWR Single block write 02CC 716 Address 4 DBCPLADR Address of the multiple block parameter list in host logical storage 02D0 720 Signed 4 DBCGPLST Guest address of the multiple block DBCPARML houses an IPARML, so any changes to the IPARML size affect this field. 02D4 724 Bitstring 40 DBCPARML IUCV reply parameter list 00FFFF7C DBCTCMSK X'FFFFFFFF'-(DBCBLKNC+DBCBLKMB) Mask to validate DBCTRGCL (IUCV target class) 02FC 764 Signed 2 DBCPLCNT Count of elements in the multiple block parameter list 02FE 766 Signed 2 DBCPLSIZ Size of the multiple block parameter list in bytes
 
 
  DBCWK Storage Layout Top of page
 
          
*** DBCWK - DASD Block I/O work block
*
*     +-------------------------------------------------------+
*   0 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 200 |                       DBCIASIT                        |
*     +---------------------------+---------------------------+
* 208 |         DBCWORK1          |         DBCWORK2          |
*     +---------------------------+---------------------------+
* 210 |         DBCWORK3          |         DBCWORK4          |
*     +------+------+------+------+---------------------------+
* 218 |:SWTCH|:SWTC2|:GKEY |:SWTC4|          DBCSAV           |
*     +------+------+------+------+---------------------------+
* 220 |         DBCHALET          |         DBCEALET          |
*     +---------------------------+---------------------------+
* 228 |         DBCERET           |         DBCERET2          |
*     +---------------------------+---------------------------+
* 230 |         DBCDPSBK          |         DBCANCHR          |
*     +---------------------------+---------------------------+
* 238 |         DBCHFRST          |         DBCHLAST          |
*     +---------------------------+---------------------------+
* 240 |         DBCOPPTR          |         DBCTFRST          |
*     +---------------------------+---------------------------+
* 248 |         DBCLCKAD          |         DBCMAXCH          |
*     +---------------------------+---------------------------+
* 250 |          DBCKEY           |///////////////////////////|
*     +---------------------------+---------------------------+
* 258 |                       DBCBKNUM                        |
*     +---------------------------+---------------------------+
* 260 |          DBCDVC           |         DBCTKPTR          |
*     +---------------------------+---------------------------+
* 268 |         DBCRTRAK          |         DBCTCHBK          |
*     +---------------------------+---------------------------+
* 270 |         DBCMXENT          |         DBCERRAD          |
*     +-------------+------+------+------+------+-------------+
* 278 |  DBCVCYL    |:FSTRN|:LOWRN|//////|:HIRN |  DBCTKSIZ   |
*     +-------------+------+------+------+------+-------------+
* 280 |                       DBCRDSAV                        |
*     +---------------------------+---------------------------+
* 288 |         DBCBLKCT          |          DBCRC            |
*     +-------------+-------------+-------------+-------------+
* 290 |  DBCBLKSZ   |  DBCHSID    |  DBCOFSET   |  DBCDBICT   |
*     +-------------+-------------+-------------+-------------+
* 298 |         DBCDVIAD          |         DBCNEXT           |
*     +---------------------------+---------------------------+
* 2A0 |         DBCRELRT          |         DBCMALET          |
*     +------+------+-------------+---------------------------+
* 2A8 |:SWTC5|//////|  DBCTMPH    |///////////////////////////|
*     +------+------+-------------+---------------------------+
* 2B0 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 300
*
*** DBCWK - DASD Block I/O work block
          
*** Overlay for DBCSPECL in DBCWK
*
*     +-------------------------------------------------------+
* 2B0 |                       DBCSVCCW                        |
*     +-------------+-------------+-------------+-------------+
* 2B8 |  DBCARGBB   |  DBCARGCC   |  DBCARGHH   |/////////////|
*     +-------------+-------------+-------------+-------------+
* 2C0 |         DBCCYLSV          |///////////////////////////|
*     +-------------+-------------+-------------+-------------+
* 2C8 |  DBCNXTBB   |  DBCNXTCC   |  DBCNXTHH   |/////////////|
*     +-------------+-------------+------+------+-------------+
* 2D0 |  DBCORICC   |  DBCORIHH   |:ORIR |:18SWT|  DBCMAXSZ   |
*     +-------------+-------------+------+------+-------------+
* 2D8 |         DBCIORAD          |         DBCGCCW           |
*     +---------------------------+---------------------------+
* 2E0 |         DBCCCWCT          |         DBCCYLTK          |
*     +---------------------------+---------------------------+
* 2E8 |         DBCSEKPT          |         DBCCPSPT          |
*     +---------------------------+---------------------------+
* 2F0 |         DBCTKHED          |         DBC18RC           |
*     +---------------------------+---------------------------+
* 2F8 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 300
*
*** Overlay for DBCSPECL in DBCWK
          
*** Overlay for DBCSPECL in DBCWK
*
*     +------+------+------+------+---------------------------+
* 2B0 |:A4SWT|:ARNUM|DBCLPM|//////|          DBCAR9           |
*     +------+------+------+------+---------------------------+
* 2B8 |         DBCPROG           |         DBCIORBK          |
*     +---------------------------+---------------------------+
* 2C0 |         DBCBLKPR          |         DBCSBIOP          |
*     +---------------------------+---------------------------+
* 2C8 |         DBCGADDR          |///////////////////////////|
*     +---------------------------+---------------------------+
* 2D0 |         DBCGLIST          |///////////////////////////|
*     +---------------------------+///////////////////////////|
* 2D8 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 300
*
*** Overlay for DBCSPECL in DBCWK
          
*** Overlay for DBCGLIST in DBCWK
*
*     +-------------------------------------------------------+
* 2D0 |                       DBCFBLKS                        |
*     +-------------------------------------------------------+
* 2D8 |                       DBCDIDBK                        |
*     +-------------------------------------------------------+
* 2E0 |                       DBCFDATA                        |
*     +-------------------------------------------------------+
* 2E8 |                        DBCLBA                         |
*     +-------------------------------------------------------+
* 2F0 |///////////////////////////////////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 300
*
*** Overlay for DBCGLIST in DBCWK
          
*** Overlay for DBCSPECL in DBCWK
*
*     +-------------------------------------------------------+
* 2B0 |                       DBCBASIT                        |
*     +---------------------------+---------------------------+
* 2B8 |         DBCBKIBK          |         DBCHALBK          |
*     +------+------+------+------+-------------+-------------+
* 2C0 |:DOPER|:FLAGS|:250RC|//////|  DBCBELCT   |/////////////|
*     +------+------+------+------+-------------+-------------+
* 2C8 |///////////////////////////|         DBCBELBK          |
*     +---------------------------+---------------------------+
* 2D0 |                       DBCGBELA                        |
*     +---------------------------+---------------------------+
* 2D8 |///////////////////////////|        DBCIPARM32         |
*     +---------------------------+---------------------------+
* 2E0 |                       DBCOFFCP                        |
*     +-------------------------------------------------------+
* 2E8 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 300
*
*** Overlay for DBCSPECL in DBCWK
          
*** Overlay for DBCSPECL in DBCWK
*
*     +-------------------------------------------------------+
* 2B0 |                       DBCSINGL                        |
*     |                           +---------------------------+
* 2B8 |                           |         DBCBLKAD          |
*     +------+------+-------------+---------------------------+
* 2C0 |:BOPER|:BLKRC|  DBCSSHCT   |         DBCMSGID          |
*     +------+------+------+------+---------------------------+
* 2C8 |////////////////////|:BLKRQ|         DBCPLADR          |
*     +--------------------+------+---------------------------+
* 2D0 |         DBCGPLST          |                           |
*     +---------------------------+                           |
* 2D8 |                                                       |
*     =                       DBCPARML                        =
*     |                           +-------------+-------------+
* 2F8 |                           |  DBCPLCNT   |  DBCPLSIZ   |
*     +---------------------------+-------------+-------------+
* 300
*
*** Overlay for DBCSPECL in DBCWK
 
 
  DBCWK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
DBCABORT       02C0 40
DBCABSET       02C0 80
DBCANCHR       0234
DBCARCCH       02BA DBCARGCC
DBCARGBB       02B8
DBCARGCC       02BA
DBCARGHH       02BC
DBCARGST       021B 10
DBCARGSV       02B8
DBCARMOD       0218 02
DBCARNUM       02B1
DBCAR9         02B4
DBCASYNC       0219 08
DBCASYRQ       02C0 20
DBCA4SWT       02B0
DBCBASIT       02B0
DBCBELBK       02CC
DBCBELCT       02C4
DBCBELGT       02C1 80
DBCBELST       02C0 08
DBCBKIBK       02B8
DBCBKNUM       0258
DBCBKOUT       02B0 01
DBCBLKAD       02BC
DBCBLKCT       0288
DBCBLKER       0219 40
DBCBLKIO       0219 02
DBCBLKMB       02CB 03
DBCBLKNC       02CB 80
DBCBLKPR       02C0
DBCBLKRC       02C1
DBCBLKRD       02CB 02
DBCBLKRQ       02CB
DBCBLKSZ       0290
DBCBLKWR       02CB 01
DBCBOPER       02C0
DBCBUSY        02B0 40
DBCBUSYV       02D5 40
DBCBYPAS       02C0 10
DBCCACC        0218 08
DBCCCWCT       02E0
DBCCDATA       0278
DBCCOPYP       0219 10
DBCCOPYS       02B0 04
DBCCPSPT       02EC
DBCCYLSV       02C0
DBCCYLTK       02E4
DBCDBICT       0296
DBCDGA4        0219 01
DBCDG18        02A8 80
DBCDG250       0219 04
DBCDIDBK       02D8
DBCDIDIO       021B 01
DBCDOPER       02C0
DBCDPSBK       0230
DBCDPSTF       027D
DBCDVC         0260
DBCDVIAD       0298
DBCEALET       0224
DBCEOT         02D5 02
DBCERET        0228
DBCERET2       022C
DBCERRAD       0274
DBCFBLKS       02D0
DBCFDATA       02E0
DBCFIRST       02D5 80
DBCFLAGS       02C1
DBCFORMT       02B0 10
DBCFSTRN       027A
DBCGADDR       02C8
DBCGBELA       02D0
DBCGCCW        02DC
DBCGKEY        021A
DBCGLDEL       021B 80
DBCGLIST       02D0
DBCGOOD        0218 80
DBCGOTBL       02C0 08
DBCGPLST       02D0
DBCGTHAL       02C1 40
DBCHALBK       02BC
DBCHALET       0220
DBCHFRST       0238
DBCHIRN        027D
DBCHLAST       023C
DBCHSID        0292
DBCIASIT       0200
DBCINCAC       0218 04
DBCINIOR       02B0 08
DBCIORAD       02D8
DBCIORBK       02BC
DBCIPARM       02D8
DBCIPARM32     02DC
DBCIWAIT       02C0 20
DBCKEY         0250
DBCLBA         02E8
DBCLCKAD       0248
DBCLOWRN       027B
DBCLPM         02B2
DBCMALET       02A4
DBCMAXCH       024C
DBCMAXSZ       02D6
DBCMIXED       02D5 10
DBCMONO        02C0 80
DBCMSGID       02C4
DBCMULTI       02C0 40
DBCMXENT       0270
DBCNEXT        029C
DBCNOCAR       0218 20
DBCNOREL       021B 40
DBCNOTEL       0219 80
DBCNSTD        0218 40
DBCNXCCH       02CA DBCNXTCC
DBCNXTBB       02C8
DBCNXTCC       02CA
DBCNXTHH       02CC
DBCNXTSV       02C8
DBCOFFCP       02E0
DBCOFSET       0294
DBCOPPTR       0240
DBCORCCH       02D0 DBCORICC
DBCORICC       02D0
DBCORIEN       02D0
DBCORIHH       02D2
DBCORIR        02D4
DBCPARML       02D4
DBCPLADR       02CC
DBCPLCNT       02FC
DBCPLSIZ       02FE
DBCPRIM        0218 01
DBCPROG        02B8
DBCQDSK        02B0 02
DBCRC          028C
DBCRC00        02C2 00
DBCRC08        02C2 08
DBCRC12        02C2 0C
DBCRC255       02C2 FF
DBCRC40        02C2 28
DBCRC44        02C2 2C
DBCRC48        02C2 30
DBCRDCPY       021B 20
DBCRDSAV       0280
DBCRELRT       02A0
DBCREMOV       02D5 08
DBCREPLP       0219 20
DBCREPS        02B0 20
DBCRTRAK       0268
DBCSAV         021C
DBCSAWWR       021B 08
DBCSBIOP       02C4
DBCSEKPT       02E8
DBCSEXIT       02C0 04
DBCSILI        02D5 20
DBCSINGL       02B0
DBCSPECL       02B0
DBCSSHCT       02C2
DBCSTD         02D5 04
DBCSVCCW       02B0
DBCSWTCH       0218
DBCSWTC2       0219
DBCSWTC4       021B
DBCSWTC5       02A8
DBCSYNC        02C0 10
DBCTCHBK       026C
DBCTCMSK       02D4 00FFFF7C
DBCTFRST       0244
DBCTKDAT       0278
DBCTKHED       02F0
DBCTKLEN       027E 00000002
DBCTKPTR       0264
DBCTKSIZ       027E
DBCTMPH        02AA
DBCTRGCL       02C8
DBCVCYL        0278
DBCVDEV        02B0 80
DBCWFAIL       021B 04
DBCWKLEN       02B0 00000060
DBCWORK        0208
DBCWORK1       0208
DBCWORK2       020C
DBCWORK3       0210
DBCWORK4       0214
DBCWRITE       0218 10
DBCXSTOR       021B 02
DBC18RC        02F4
DBC18SWT       02D5
DBC250RC       02C2
DBC64BIT       02C0 04
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:27:38 EDT.
Copyright IBM Corporation, 1990, 2020