DFMBK | Back to Index page

| Prolog Control Block Contents DFMBK 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.

DFMBK Prolog | Top of page

     NAME       : HCPDFMBK
     DESCRIPTION: Dump file map record
     DSECT      : DFMBK
     FUNCTION   : Contains the relative record number of each part
                  of a dump file, created by Hard ABEND, S/A Dump,
                  VMDUMP or Non-Destructive dump.
     LOCATED BY : The DFMBK is always the second record in a dump file.
     CREATED BY : HCPABB, HCPDMP, HCPVDU or SADUxx.
     DELETED BY : Not applicable
     RELOCATION CONSIDERATIONS : None
     COMMENTS   : The DFMBK maps a 4K record that is written
                  to a dump file.

DFMBK Control Block Content | Top of page

     DFMBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      DFMBK          Dump file map record
    0000    0 Character    8 DFMBKID        Identification string
    0008    8 Signed       4 DFMDFIR        Record number of 1st DFIR Page
    000C   12 Signed       4 DFMSDXBK       Record number of the stand-alone
                                            dump index record
    0010   16 Signed       4 DFMDALBK       Record number of the first access
                                            list record
    0014   20 Signed       4 DFMDALNO       Number of access list records
    0018   24 Signed       4 DFMCOUNT       Number of address spaces in the
                                            SDF, and once processed into a
                                            CMS file, this is the number of
                                            related dump files that can be
                                            created, if all goes well.
              0000001C       DFMSIZE        *-DFMBK Length of fixed portion
                                            of the DFMBK
    001C   28 Signed       4 DFMASIBK       Record number of ASIBK for each
                                            dumped address space
              00000004       DFMASILN       *-DFMASIBK Length of repeatable
                                            section
          DFMMAX defines the maximum number of ASIBKs that one
          DFMBK can address.
              000003F9       DFMMAX         (4096-DFMSIZE)/4

DFMBK Storage Layout | Top of page

    *** DFMBK - Dump file map record
    *
    *     +-------------------------------------------------------+
    *   0 |                       DFMBKID                         |
    *     +---------------------------+---------------------------+
    *   8 |         DFMDFIR           |         DFMSDXBK          |
    *     +---------------------------+---------------------------+
    *  10 |         DFMDALBK          |         DFMDALNO          |
    *     +---------------------------+---------------------------+
    *  18 |         DFMCOUNT          |         DFMASIBK          |
    *     +---------------------------+---------------------------+
    *  20
    *
    *** DFMBK - Dump file map record

DFMBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    DFMASIBK       001C
    DFMASILN       001C 00000004
    DFMBKID        0000
    DFMCOUNT       0018
    DFMDALBK       0010
    DFMDALNO       0014
    DFMDFIR        0008
    DFMMAX         001C 000003F9
    DFMSDXBK       000C
    DFMSIZE        0018 0000001C

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:27:43 EDT.
Copyright IBM Corporation, 1990, 2020