$CRWBK | Back to Index page

| Prolog Control Block Contents $CRWBK 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.

$CRWBK Prolog | Top of page

     NAME       : LGRCRWBK
     DESCRIPTION: Relocation mapping for HCPCRWBK
     DSECT      : $CRWBK
     FUNCTION   : LGRCRWBK describes those fields of the CRWBK 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 : HCPRLIWF - CRWBK 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 HCPCRWBK 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.

$CRWBK Control Block Content | Top of page

     $CRWBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $CRWBK         Relocation mapping for HCPCRWBK
              00000001       $CRW_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 $CRW_HDRL      Header length (in bytes)
    0002    2 Signed       2 $CRW_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $CRW_HDLN      *-$CRWBK Length of header (bytes)
          Bit map: Contains the CRWBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPCRWBK.
                   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 $CRW_BITS (0)  Bit map area
              00000000       $CRW_BLEN      *-$CRW_BITS Length of bit map
                                            area
          Data:    Contains all HCPCRWBK 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 $CRW_DATA (0)  Start of data map
    0008    8 Bitstring    1 $CRWFLAGS      Channel report codes
    0009    9 Bitstring    1 $CRWEFLD       CRW Error Recovery Information
    000A   10 Bitstring    2 $CRWRSID       Resource ID Code
    000C   12 Bitstring    4 $CRWNEXT       Next CRW pointer
              00000010       $CRW_LEN       *-$CRWBK Total length, in bytes
              00000002       $CRW_SZ        ($CRW_LEN+7)/8 Size in
                                            doublewords

$CRWBK Storage Layout | Top of page

    *** $CRWBK - Relocation mapping for HCPCRWBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $CRW_HDRL   | $CRW_BITL   |///////////////////////////|
    *     +------+------+-------------+---------------------------+
    *   8 |(008) |:WEFLD|  $CRWRSID   |         $CRWNEXT          |
    *     +------+------+-------------+---------------------------+
    *  10
    *
    *** $CRWBK - Relocation mapping for HCPCRWBK

$CRWBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $CRW_BITL      0002
    $CRW_BITS      0008
    $CRW_BLEN      0008 00000000
    $CRW_DATA      0008
    $CRW_HDLN      0004 00000008
    $CRW_HDRL      0000
    $CRW_LEN       000C 00000010
    $CRW_SZ        000C 00000002
    $CRW_VER       0000 00000001
    $CRWEFLD       0009
    $CRWFLAGS      0008
    $CRWNEXT       000C
    $CRWRSID       000A

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:00 EDT.
Copyright IBM Corporation, 1990, 2020