$BKIBK | Back to Index page

| Prolog Control Block Contents $BKIBK 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.

$BKIBK Prolog | Top of page

     NAME       : LGRBKIBK
     DESCRIPTION: Relocation mapping for HCPBKIBK
     DSECT      : $BKIBK
     FUNCTION   : LGRBKIBK describes those fields of the BKIBK 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 : HCPRLWBF - BKIBK Formatter for LGR
     DELETED BY : HCPRLDRL - Release storage associated with a 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 HCPBKIBK 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.

$BKIBK Control Block Content | Top of page

     $BKIBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $BKIBK         Relocation mapping for HCPBKIBK
              00000001       $BKI_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 $BKI_HDRL      Header length (in bytes)
    0002    2 Signed       2 $BKI_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $BKI_HDLN      *-$BKIBK Length of header (bytes)
          Bit map: Contains the BKIBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPBKIBK.
                   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 $BKI_BITS (0)  Bit map area
    0008    8 Bitstring    1 $BKI0
              1... ....      $BKIDEVRD      X'80' $BKIDEVRD BKIFLAGS
              00000001       $BKI_BLEN      *-$BKI_BITS Length of bit map
                                            area
          Data:    Contains all HCPBKIBK 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.
    0009    9 Bitstring    1 $BKI_DATA (0)  Start of data map
    0009    9 Bitstring    4 $BKIBLKSZ      Block size of user's disk
    000D   13 Bitstring    2 $BKIVDEVN      Virtual device number
    000F   15 Bitstring    8 $BKIOFFCP      CP offset for disk
    0017   23 Bitstring    8 $BKIOFFST      User's requested offset
    001F   31 Bitstring    8 $BKISTART      User's starting block
    0027   39 Bitstring    8 $BKIEND        User's ending block
              0000002F       $BKI_LEN       *-$BKIBK Length of mapping block
              00000006       $BKI_SZ        ($BKI_LEN+7)/8 Size of mapping
                                            block

$BKIBK Storage Layout | Top of page

    *** $BKIBK - Relocation mapping for HCPBKIBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $BKI_HDRL   | $BKI_BITL   |///////////////////////////|
    *     +------+------+-------------+------+-------------+------+
    *   8 |$BKI0 |        $BKIBLKSZ          | $BKIVDEVN   |(00F)-|
    *     +------+---------------------------+-------------+------+
    *  10 |                  -$BKIOFFCP                    |(017)-|
    *     +------------------------------------------------+------+
    *  18 |                  -$BKIOFFST                    |(01F)-|
    *     +------------------------------------------------+------+
    *  20 |                  -$BKISTART                    |(027)-|
    *     +------------------------------------------------+------+
    *  28 |                   -$BKIEND                     | 2F
    *     +------------------------------------------------+
    *
    *** $BKIBK - Relocation mapping for HCPBKIBK

$BKIBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $BKI_BITL      0002
    $BKI_BITS      0008
    $BKI_BLEN      0008 00000001
    $BKI_DATA      0009
    $BKI_HDLN      0004 00000008
    $BKI_HDRL      0000
    $BKI_LEN       0027 0000002F
    $BKI_SZ        0027 00000006
    $BKI_VER       0000 00000001
    $BKIBLKSZ      0009
    $BKIDEVRD      0008 80
    $BKIEND        0027
    $BKIOFFCP      000F
    $BKIOFFST      0017
    $BKISTART      001F
    $BKIVDEVN      000D
    $BKI0          0008

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:31:59 EDT.
Copyright IBM Corporation, 1990, 2020