$DVLBK | Back to Index page

| Prolog Control Block Contents $DVLBK 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.

$DVLBK Prolog | Top of page

     NAME       : LGRDVLBK
     DESCRIPTION: Relocation mapping for HCPDVLBK
     DSECT      : $DVLBK
     FUNCTION   : LGRDVLBK describes those fields of the DVLBK that
                  will be migrated to the destination system during
                  guest relocation.
     LOCATED BY : This is a mapping of the RDODATA area within the
                  RDOBK during guest relocation.
     CREATED BY : HCPRLFLF - DVLBK Formatter for LGR
     DELETED BY : HCPRLDRL - Release storage associated with an RDP
     RELOCATION CONSIDERATIONS : This control block is used during live guest
                  relocation.  It is used to relocate a control block
                  defined in a corresponding HCP COPY file.  Any
                  fields or bits defined in HCPDVLBK which are
                  required on the destination system must be defined
                  here, and code must be added to migrate the field
                  or bit during a relocation.

$DVLBK Control Block Content | Top of page

     $DVLBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $DVLBK         Relocation mapping for HCPDVLBK
              00000001       $DVL_VER       1 Mapping version number for this
                                            DSECT. Version is independent of
                                            the CP level and need only be
                                            changed when this DSECT is
                                            changed. The convention is to
                                            increment by 1.
    0000    0 Signed       2 $DVL_HDRL      Header length (in bytes)
    0002    2 Signed       2 $DVL_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $DVL_HDLN      *-$DVLBK Length of header (bytes)
          Bit map: Contains the DVLBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPDVLBK.
                   This yields a consistent mapping that ensures
                   compatibility when a guest is relocated between
                   systems at differing service levels.
                   Names in the comments column indicate the control
                   block byte which contains the flag. This name is
                   subject to change if the flag definition changes.
             ====> NEVER change bits which already exist here.
             ====> NEVER change the order of bits in this section.
             ====> ALWAYS add new bits at the end of this section,
                   together with new flag bytes as required.
    0008    8 Signed       2 $DVL_BITS (0)  Bit map area
              00000000       $DVL_BLEN      *-$DVL_BITS Length of bit map
                                            area
          Data:    Contains all HCPDVLBK data that is subject to
                   relocation, except for flag bits, which are
                   handled separately.
                   All fields are defined as XLnn to avoid alignment
                   warnings and to pack the data efficiently.
             ====> NEVER change fields which already exist here.
             ====> NEVER change the order of fields in this section.
             ====> ALWAYS add new fields at the end of this section.
                   together with new flag bytes as required.
    0008    8 Bitstring    1 $DVL_DATA (0)  Start of data map
          DVL Header definition
    0008    8 Bitstring    4 $DVLHFRST      First DVLRANGE
    000C   12 Bitstring    4 $DVLHSOFR      DVLRANGE where GD left off
    0010   16 Bitstring    4 $DVLHLAST      Last DVLRANGE
    0014   20 Bitstring    4 $DVLHMXNM      Maximum OK number
    0018   24 Bitstring    4 $DVLHADBM      Address of Already Done Bit Map
    001C   28 Bitstring    4 *              Reserved for future IBM use
          DVL Range definition
    0008    8 Bitstring    4 $DVLRNEXT      Next DVLRANGE in list
    000C   12 Bitstring    4 $DVLRFRST      First number in range
    0010   16 Bitstring    4 $DVLRSOFR      Number where GD left off
    0014   20 Bitstring    4 $DVLRLST       Last number in range
    0018   24 Bitstring    4 $DVLRCNT       Count of numbers in range
    001C   28 Bitstring    4 $DVLRESET      0 ==> not processed yet
              00000020       $DVLBYSZ       *-$DVLBK Byte length of $DVLBK
              00000004       $DVLSIZE       ((*-$DVLBK)+7)/8 DWord length of
                                            $DVLBK

$DVLBK Storage Layout | Top of page

    *** $DVLBK - Relocation mapping for HCPDVLBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $DVL_HDRL   | $DVL_BITL   |///////////////////////////|
    *     +-------------+-------------+---------------------------+
    *   8 |        $DVLHFRST          |        $DVLHSOFR          |
    *     +---------------------------+---------------------------+
    *  10 |        $DVLHLAST          |        $DVLHMXNM          |
    *     +---------------------------+---------------------------+
    *  18 |        $DVLHADBM          |///////////////////////////|
    *     +---------------------------+---------------------------+
    *  20
    *
    *** $DVLBK - Relocation mapping for HCPDVLBK

    *** Overlay for $DVL_DATA in $DVLBK
    *
    *     +---------------------------+---------------------------+
    *   8 |        $DVLRNEXT          |        $DVLRFRST          |
    *     +---------------------------+---------------------------+
    *  10 |        $DVLRSOFR          |         $DVLRLST          |
    *     +---------------------------+---------------------------+
    *  18 |         $DVLRCNT          |        $DVLRESET          |
    *     +---------------------------+---------------------------+
    *  20
    *
    *** Overlay for $DVL_DATA in $DVLBK

$DVLBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $DVL_BITL      0002
    $DVL_BITS      0008
    $DVL_BLEN      0008 00000000
    $DVL_DATA      0008
    $DVL_HDLN      0004 00000008
    $DVL_HDRL      0000
    $DVL_VER       0000 00000001
    $DVLBYSZ       001C 00000020
    $DVLHADBM      0018
    $DVLHFRST      0008
    $DVLHLAST      0010
    $DVLHMXNM      0014
    $DVLHSOFR      000C
    $DVLRCNT       0018
    $DVLRESET      001C
    $DVLRFRST      000C
    $DVLRLST       0014
    $DVLRNEXT      0008
    $DVLRSOFR      0010
    $DVLSIZE       001C 00000004

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:02 EDT.
Copyright IBM Corporation, 1990, 2020