DBIRQ Back to Index page
 
Prolog 
Control Block Contents 
   DBIRQ 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.


  DBIRQ Prolog Top of page
 
 NAME       : HCPDBIRQ
 DESCRIPTION: DASD BLOCK I/O SSCH REQUEST DATA
 DSECT      : DBIRQ
 FUNCTION   : This DSECT maps data for DASD block I/O
              system service to honor one IUCV SEND request,
              and for DIAGNOSE X'250' to honor one read/write
              request.
 LOCATED BY : BLKDBIAD field in HCPBLKIO
              BKIDBIRQ field in HCPBKIBK
 CREATED BY : HCPBIM, for *BLOCKIO
              HCPBIR, for DIAGNOSE X'250' read/write
              requests.
 DELETED BY : HCPBIM, for *BLOCKIO
              HCPBIR, for DIAGNOSE X'250' read/write
              requests.
 SERIALIZED : Unique task execution
              VMDBK dispatch lock.
              For *BLOCKIO, the chain of DBIRQs is
              protected by the BLKIO lock, in HCPBLKIO.
              For DIAGNOSE X'250', the chain of DBIRQs is
              protected by the BKIBK lock in HCPBKIBK.
 RELOCATION CONSIDERATIONS : None
 
 
  DBIRQ Control Block Content Top of page
 

 DBIRQ DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DBIRQ DASD BLOCK I/O SSCH REQUEST DATA 0000 0 Address 4 DBIPREV Previous Outstanding DBIRQ 0004 4 Address 4 DBINEXT Next Outstanding DBIRQ 0008 8 Address 4 DBIIORBK IORBK Associated with Request 000C 12 Signed 4 * Reserved for Future IBM Use 0010 16 Bitstring 24 DBIIRASV Save area for interrupt return 00000005 DBISIZE (*-DBIRQ+7)/8 Size, in doublewords, of DBIRQ
 
 
  DBIRQ Storage Layout Top of page
 
          
*** DBIRQ - DASD BLOCK I/O SSCH REQUEST DATA
*
*     +---------------------------+---------------------------+
*   0 |         DBIPREV           |         DBINEXT           |
*     +---------------------------+---------------------------+
*   8 |         DBIIORBK          |///////////////////////////|
*     +---------------------------+---------------------------+
*  10 |                                                       |
*     =                       DBIIRASV                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  28
*
*** DBIRQ - DASD BLOCK I/O SSCH REQUEST DATA
 
 
  DBIRQ Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
DBIIORBK       0008
DBIIRASV       0010
DBINEXT        0004
DBIPREV        0000
DBISIZE        0010 00000005
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:48:41 EDT.
Copyright IBM Corporation, 1990, 2022