VDSBK Back to Index page
 
Prolog 
Control Block Contents 
   VDSBK 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.


  VDSBK Prolog Top of page
  
 NAME       : HCPVDSBK
 DESCRIPTION: VIRTUAL DEVICE SIMULATION BLOCK
 DSECT      : VDSBK
 FUNCTION   : THIS CONTROL BLOCK CONTAINS INFORMATION NECESSARY FOR
              SIMULATION OF A VIRTUAL DEVICE.
 LOCATED BY : VDEVVDS   FIELD OF HCPVDEV
 CREATED BY : HCPVDSDF - WHILE DEFINING A VIRTUAL DEVICE.
 DELETED BY : HCPVDBDL - WHEN DELETING A VIRTUAL DEVICE.
 RELOCATION CONSIDERATIONS : This control block is relocated as part of a live
              guest relocation (LGR).  The bits and fields that
              need to be relocated are defined in the
              corresponding LGRVDSBK COPY file.  Whenever changes
              are made to this control block, consideration must
              be given to any effects these changes will have on
              a relocation.  If any new fields or bits are
              defined, they may need to be relocated.  If
              existing bits or fields are changed, corresponding
              modifications may be required in the LGR version of
              this control block.  Consider also the effects of
              these changes on a relocation involving a back-level
              release of CP.
 
 
  VDSBK Control Block Content Top of page
  




 VDSBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VDSBK          VIRTUAL DEVICE SIMULATION BLOCK
0000    0 Signed       4 VDSVFC         POINTER TO VFCBLOK
0004    4 Bitstring    4 VDSFLAGS (0)   DEVICE SIMULATION FLAGS
0004    4 Bitstring    1 VDSRFLG        DEVICE SIMULATION REQUEST FLAG
          1... ....      VDSATTN        X'80' VDSATTN CONS - 2 OR MORE
                                        ATTENTIONS SEEN
          .1.. ....      VDSDIAG        X'40' VDSDIAG DIAGNOSE I/O ACTIVE
                                        ON THIS DEVICE
0005    5 Bitstring    1 VDSSFLG        DEVICE SIMULATION STATUS FLAG
          1... ....      VDSCCW1        X'80' VDSCCW1 PROCESSING FIRST
                                        CCW IN CHAIN
          .1.. ....      VDSCPOST       X'40' VDSCPOST VIRTUAL COND. CODE
                                        PRESENTED
          ..1. ....      VDSLTIC        X'20' VDSLTIC LAST CCW PROCESSED
                                        WAS A TIC
          ...1 ....      VDSDTRAN       X'10' VDSDTRAN DATA XFER IN THIS
                                        CCW STRING
          .... 1...      VDSFEED        X'08' VDSFEED RDR - LAST CCW DID
                                        A 'FEED'
          .... .1..      VDSCRCW        X'04' VDSCRCW TIC SCAN PASSED
                                        CURR RCWTASK
          .... ..1.      VDSREJLT       X'02' VDSREJLT PRESENT COMMAND
                                        REJECT LATER
          .... ...1      VDSUE          X'01' VDSUE UNIT EXCEPTION HAS
                                        BEEN PRESENTED
0006    6 Bitstring    1 VDSCFLG        DEVICE SIMULATION CONTROL FLAG
          .... 1...      VDSAUCR        X'08' VDSAUCR CONS - AUTO CR ON
                                        FIRST READ
          .... .1..      VDSAUCRX       X'04' VDSAUCRX AUCR bit when last
                                        LGR was initiated
0007    7 Bitstring    1 *              RESERVED FOR FUTURE IBM USE
0008    8 Signed       4 VDSRCW         POINTER TO CURRENT RCWTASK
000C   12 Signed       4 VDSGSDVC       POINTER TO WORK GSDBLOK
0010   16 Signed       4 VDSACCW        ADDRESS OF CURRENT CCW IN RCWTASK
0014   20 Signed       4 VDSUCSB        POINTER TO UCSB DATA BLOCK
0018   24 Signed       4 VDSGSDW        POINTER TO VSP WORK GSDBLOK
001C   28 Signed       4 VDSGSDI        POINTER TO INPUT GSDBLOK
0020   32 Signed       4 VDSGSDO        POINTER TO OUTPUT GSDBLOK
0024   36 Address      4 VDSSDL         POINTER TO AN SDLBK
          00000005       VDSSIZE        (*-VDSBK+7)/8 VDSBK SIZE IN
                                        DOUBLE-WORDS
 
 
  VDSBK Storage Layout Top of page
  
          
*** VDSBK - VIRTUAL DEVICE SIMULATION BLOCK
*
*     +---------------------------+------+------+------+------+
*   0 |          VDSVFC           |:RFLG |:SFLG |:CFLG |//////|
*     +---------------------------+------+------+------+------+
*   8 |          VDSRCW           |         VDSGSDVC          |
*     +---------------------------+---------------------------+
*  10 |         VDSACCW           |         VDSUCSB           |
*     +---------------------------+---------------------------+
*  18 |         VDSGSDW           |         VDSGSDI           |
*     +---------------------------+---------------------------+
*  20 |         VDSGSDO           |          VDSSDL           |
*     +---------------------------+---------------------------+
*  28
*
*** VDSBK - VIRTUAL DEVICE SIMULATION BLOCK
 
 
  VDSBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
VDSACCW        0010
VDSATTN        0004 80
VDSAUCR        0006 08
VDSAUCRX       0006 04
VDSCCW1        0005 80
VDSCFLG        0006
VDSCPOST       0005 40
VDSCRCW        0005 04
VDSDIAG        0004 40
VDSDTRAN       0005 10
VDSFEED        0005 08
VDSFLAGS       0004
VDSGSDI        001C
VDSGSDO        0020
VDSGSDVC       000C
VDSGSDW        0018
VDSLTIC        0005 20
VDSRCW         0008
VDSREJLT       0005 02
VDSRFLG        0004
VDSSDL         0024
VDSSFLG        0005
VDSSIZE        0024 00000005
VDSUCSB        0014
VDSUE          0005 01
VDSVFC         0000
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:57:35 EDT.
Copyright IBM Corporation, 1990, 2022