$CCTBK | Back to Index page

| Prolog Control Block Contents $CCTBK 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.

$CCTBK Prolog | Top of page

     NAME       : LGRCCTBK
     DESCRIPTION: Relocation mapping for HCPCCTBK
     DSECT      : $CCTBK
     FUNCTION   : LGRCCTBK describes those fields of the CCTBK 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.
     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 HCPCCTBK 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.

$CCTBK Control Block Content | Top of page

     $CCTBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $CCTBK         Relocation mapping for HCPCCTBK
              00000001       $CCT_VER       1 Mapping version number
    0000    0 Signed       2 $CCT_HDRL      Header length (in bytes)
    0002    2 Signed       2 $CCT_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $CCT_HDLN      *-$CCTBK Length of header (bytes)
          Bit map: Contains the CCTBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPCCTBK.
                   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 $CCT_BITS (0)  Bit map area
    0008    8 Bitstring    1 $CCT0
              1... ....      $CCTPNDSN      X'80' $CCTPNDSN CCTFLAG2
              .1.. ....      $CCTPNDSP      X'40' $CCTPNDSP CCTFLAG2
              ..1. ....      $CCTPNDRN      X'20' $CCTPNDRN CCTFLAG2
              ...1 ....      $CCTPNDRP      X'10' $CCTPNDRP CCTFLAG2
              .... 1...      $CCTPNDCT      X'08' $CCTPNDCT CCTFLAG2
              .... .1..      $CCTRTVBF      X'04' $CCTRTVBF CCTSTAT
              .... ..1.      $CCTSYNC       X'02' $CCTSYNC CCTSTAT
              .... ...1      $CCTCPINT      X'01' $CCTCPINT CCTSTAT
    0009    9 Bitstring    1 $CCT1
              1... ....      $CCTSTKED      X'80' $CCTSTKED CCTSTAT
              00000002       $CCT_BLEN      *-$CCT_BITS Length of bit map
                                            area
          Data:    Contains all HCPCCTBK 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.
    000A   10 Bitstring    1 $CCT_DATA (0)  Start of data map
    000A   10 Bitstring    2 $CCTMXPID      CURRENT MAX PATH ID FOR THIS CCT
    000C   12 Bitstring    4 $CCTIUCV       POINTER TO THE USER'S IUCVBK
    0010   16 Bitstring    4 $CCTSNDHD      SEND QUEUE HEAD
    0014   20 Bitstring    4 $CCTSNDTL      SEND QUEUE TAIL
    0018   24 Bitstring    4 $CCTSNDPR      SEND PRIORITY QUEUE TAIL
    001C   28 Bitstring    4 $CCTRCVHD      RECEIVE QUEUE HEAD
    0020   32 Bitstring    4 $CCTRCVTL      RECEIVE QUEUE TAIL
    0024   36 Bitstring    4 $CCTRPYHD      REPLY QUEUE HEAD
    0028   40 Bitstring    4 $CCTRPYTL      REPLY QUEUE TAIL
    002C   44 Bitstring    4 $CCTRPYPR      REPLY PRIORITY QUEUE TAIL
    0030   48 Bitstring    4 $CCTMSGCT      TOTAL MSGS SENT ON ALL PATHS
    0034   52 Bitstring    1 $CCTCPSYS      CP SYSTEM SERVICE CODE
    0035   53 Bitstring    4 $CCTDESCT      SEND QUEUE MSGS TO BE DESCRIBED
    0039   57 Bitstring    4 $CCTPDSEG      -> RDO offset to first PDEBK
              0000003D       $CCT_LEN       *-$CCTBK Total length, in bytes
              00000008       $CCT_SZ        ($CCT_LEN+7)/8 Size in
                                            doublewords

$CCTBK Storage Layout | Top of page

    *** $CCTBK - Relocation mapping for HCPCCTBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $CCT_HDRL   | $CCT_BITL   |///////////////////////////|
    *     +------+------+-------------+---------------------------+
    *   8 |$CCT0 |$CCT1 | $CCTMXPID   |         $CCTIUCV          |
    *     +------+------+-------------+---------------------------+
    *  10 |        $CCTSNDHD          |        $CCTSNDTL          |
    *     +---------------------------+---------------------------+
    *  18 |        $CCTSNDPR          |        $CCTRCVHD          |
    *     +---------------------------+---------------------------+
    *  20 |        $CCTRCVTL          |        $CCTRPYHD          |
    *     +---------------------------+---------------------------+
    *  28 |        $CCTRPYTL          |        $CCTRPYPR          |
    *     +---------------------------+------+--------------------+
    *  30 |        $CCTMSGCT          |(034) |    $CCTDESCT-      |
    *     +------+--------------------+------+--------------------+
    *  38 |-(035)|        $CCTPDSEG          | 3D
    *     +------+---------------------------+
    *
    *** $CCTBK - Relocation mapping for HCPCCTBK

$CCTBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $CCT_BITL      0002
    $CCT_BITS      0008
    $CCT_BLEN      0009 00000002
    $CCT_DATA      000A
    $CCT_HDLN      0004 00000008
    $CCT_HDRL      0000
    $CCT_LEN       0039 0000003D
    $CCT_SZ        0039 00000008
    $CCT_VER       0000 00000001
    $CCTCPINT      0008 01
    $CCTCPSYS      0034
    $CCTDESCT      0035
    $CCTIUCV       000C
    $CCTMSGCT      0030
    $CCTMXPID      000A
    $CCTPDSEG      0039
    $CCTPNDCT      0008 08
    $CCTPNDRN      0008 20
    $CCTPNDRP      0008 10
    $CCTPNDSN      0008 80
    $CCTPNDSP      0008 40
    $CCTRCVHD      001C
    $CCTRCVTL      0020
    $CCTRPYHD      0024
    $CCTRPYPR      002C
    $CCTRPYTL      0028
    $CCTRTVBF      0008 04
    $CCTSNDHD      0010
    $CCTSNDPR      0018
    $CCTSNDTL      0014
    $CCTSTKED      0009 80
    $CCTSYNC       0008 02
    $CCT0          0008
    $CCT1          0009

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:01 EDT.
Copyright IBM Corporation, 1990, 2020