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 7.2.0 Last updated on 24 Jun 2020 at 09:31:32 EDT.
Copyright IBM Corporation, 1990, 2020