DBIRQ - 64-bit CP - V4R4.0

Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### DBIRQ

Prolog

Control Block Contents
DBIRQ DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### DBIRQ Prolog

     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.

#### DBIRQ Control Block Content

#### DBIRQ DSECT

    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

    *** 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

    Symbol         Dspl Value
    -------------- ---- -----
    DBIIORBK       0008
    DBIIRASV       0010
    DBINEXT        0004
    DBIPREV        0000
    DBISIZE        0010 00000005

This information is based on z/VM V4R4.0. Last updated on 30 Jul 2003 at 12:37:08 EDT.
Copyright IBM Corporation, 1990, 2003