$CHCBK | Back to Index page

| Prolog Control Block Contents $CHCBK 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.

$CHCBK Prolog | Top of page

     NAME       : LGRCHCBK
     DESCRIPTION: Relocation mapping for HCPCHCBK
     DSECT      : $CHCBK
     FUNCTION   : LGRCHCBK describes those fields of the CHCBK 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 : HCPRLICF - CHCBK 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 HCPCHCBK 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.

$CHCBK Control Block Content | Top of page

     $CHCBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $CHCBK         Relocation mapping for HCPCHCBK
              00000001       $CHC_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 $CHC_HDRL      Header length (in bytes)
    0002    2 Signed       2 $CHC_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $CHC_HDLN      *-$CHCBK Length of header (bytes)
          Bit map: Contains the CHCBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPCHCBK.
                   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 $CHC_BITS (0)  Bit map area
    0008    8 Bitstring    1 $CHC0
              1... ....      $CHCMSM        X'80' $CHCMSM CHCHFLAG
              .1.. ....      $CHCTIM        X'40' $CHCTIM CHCHFLAG
              ..1. ....      $CHCRWCC1      X'20' $CHCRWCC1 CHCSFLAG
              ...1 ....      $CHCEMW        X'10' $CHCEMW CHCSFLAG
              .... 1...      $CHCIPR        X'08' $CHCIPR CHCSFLAG
              00000001       $CHC_BLEN      *-$CHC_BITS Length of bit map
                                            area
          Data:    Contains all HCPCHCBK 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 $CHC_DATA (0)  Start of data map
    0009    9 Bitstring    1 $CHCKEY        Key of user measurement block
    000A   10 Bitstring    4 $CHCGMBOH      zArch: high order MBO word
    000E   14 Bitstring    4 $CHCGMBOL      zArch: Low order MBO word
    0012   18 Bitstring    4 $CHCIORW       Pointer to chain of CRWBK's
    0016   22 Bitstring    4 $CHCSALIM      Set Address Limit Value
    001A   26 Bitstring    4 $CHCMCV        Pointer to chain of MCVBK's
    001E   30 Bitstring    1 $CHCPGBY0      Non zero means CHCPGID is set
    001F   31 Bitstring   11 $CHCPGID       Guest Path Group ID
    002A   42 Bitstring  256 $CHCCHPID      Virtual chpid table
              0000012A       $CHC_LEN       *-$CHCBK Total length, in bytes
              00000026       $CHC_SZ        ($CHC_LEN+7)/8 Size in
                                            doublewords

$CHCBK Storage Layout | Top of page

    *** $CHCBK - Relocation mapping for HCPCHCBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $CHC_HDRL   | $CHC_BITL   |///////////////////////////|
    *     +------+------+-------------+-------------+-------------+
    *   8 |$CHC0 |:CKEY |        $CHCGMBOH          | $CHCGMBOL-  |
    *     +------+------+---------------------------+-------------+
    *  10 |   -(00E)    |         $CHCIORW          | $CHCSALIM-  |
    *     +-------------+---------------------------+------+------+
    *  18 |   -(016)    |         $CHCMCV           |(01E) |      |
    *     +-------------+---------------------------+------+      |
    *     |                       $CHCPGID                        |
    *     |             +-----------------------------------------+
    *     |             |                                         |
    *     +-------------+                                         |
    *  30 |                                                       |
    *     =                      $CHCCHPID                        =
    *     |             +-----------------------------------------+
    *     |             | 12A
    *     +-------------+
    *
    *** $CHCBK - Relocation mapping for HCPCHCBK

$CHCBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $CHC_BITL      0002
    $CHC_BITS      0008
    $CHC_BLEN      0008 00000001
    $CHC_DATA      0009
    $CHC_HDLN      0004 00000008
    $CHC_HDRL      0000
    $CHC_LEN       002A 0000012A
    $CHC_SZ        002A 00000026
    $CHC_VER       0000 00000001
    $CHCCHPID      002A
    $CHCEMW        0008 10
    $CHCGMBOH      000A
    $CHCGMBOL      000E
    $CHCIORW       0012
    $CHCIPR        0008 08
    $CHCKEY        0009
    $CHCMCV        001A
    $CHCMSM        0008 80
    $CHCPGBY0      001E
    $CHCPGID       001F
    $CHCRWCC1      0008 20
    $CHCSALIM      0016
    $CHCTIM        0008 40
    $CHC0          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