$VFCBK | Back to Index page

| Prolog Control Block Contents $VFCBK 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.

$VFCBK Prolog | Top of page

     NAME       : LGRVFCBK
     DESCRIPTION: Relocation mapping for HCPVFCBK
     DSECT      : $VFCBK
     FUNCTION   : LGRVFCBK describes those fields of the VFCBK 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 : HCPRLFFF - VFCBK 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 HCPVFCBK 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.

$VFCBK Control Block Content | Top of page

     $VFCBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $VFCBK         Relocation mapping for HCPVFCBK
              00000001       $VFC_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 $VFC_HDRL      Header length (in bytes)
    0002    2 Signed       2 $VFC_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $VFC_HDLN      *-$VFCBK Length of header (bytes)
          Bit map: Contains the VFCBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPVFCBK.
                   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 $VFC_BITS (0)  Bit map area
    0008    8 Bitstring    1 $VFC0
              1... ....      $VFCBEOF       X'80' $VFCBEOF VFCBFLAG
              .1.. ....      $VFCBDIAG      X'40' $VFCBDIAG VFCBFLAG
              ..1. ....      $VFCBFCBV      X'20' $VFCBFCBV VFCBFLAG
              ...1 ....      $VFCBREP       X'10' $VFCBREP VFCBFLAG
              00000001       $VFC_BLEN      *-$VFC_BITS Length of bit map
                                            area
          Data:    Contains all HCPVFCBK 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 $VFC_DATA (0)  Start of data map
    0009    9 Bitstring    4 $VFCBNAME      FCB'S Name
    000D   13 Bitstring    1 $VFCBNUM       Channel Number or Space Count
    000E   14 Bitstring    2 $VFCBPOSN      Current Line Number
    0010   16 Bitstring    1 $VFCBPRED      The last CCW issued
    0011   17 Bitstring    2 $VFCBLEN       Length of FCB Data
    0013   19 Bitstring    1 $VFCBINDX      FCB Index Byte Value
    0014   20 Bitstring  260 $VFCBLOAD      Forms Control Buffer Data
    0118  280 Bitstring    2 $VFCBPGCT      Current page count
    011A  282 Bitstring    4 $VFCBIBUF      'Sense Intermediate Buffer' Info
              0000011E       $VFC_LEN       *-$VFCBK Total length, in bytes
              00000024       $VFC_SZ        ($VFC_LEN+7)/8 Size in
                                            doublewords

$VFCBK Storage Layout | Top of page

    *** $VFCBK - Relocation mapping for HCPVFCBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $VFC_HDRL   | $VFC_BITL   |///////////////////////////|
    *     +------+------+-------------+------+------+-------------+
    *   8 |$VFC0 |        $VFCBNAME          |:CBNUM| $VFCBPOSN   |
    *     +------+-------------+------+------+------+-------------+
    *  10 |(010) |  $VFCBLEN   |(013) |                           |
    *     +------+-------------+------+                           |
    *  18 |                                                       |
    *     =                      $VFCBLOAD                        =
    *     |                                                       |
    *     +-------------+---------------------------+-------------+
    * 118 | $VFCBPGCT   |        $VFCBIBUF          | 11E
    *     +-------------+---------------------------+
    *
    *** $VFCBK - Relocation mapping for HCPVFCBK

$VFCBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $VFC_BITL      0002
    $VFC_BITS      0008
    $VFC_BLEN      0008 00000001
    $VFC_DATA      0009
    $VFC_HDLN      0004 00000008
    $VFC_HDRL      0000
    $VFC_LEN       011A 0000011E
    $VFC_SZ        011A 00000024
    $VFC_VER       0000 00000001
    $VFCBDIAG      0008 40
    $VFCBEOF       0008 80
    $VFCBFCBV      0008 20
    $VFCBIBUF      011A
    $VFCBINDX      0013
    $VFCBLEN       0011
    $VFCBLOAD      0014
    $VFCBNAME      0009
    $VFCBNUM       000D
    $VFCBPGCT      0118
    $VFCBPOSN      000E
    $VFCBPRED      0010
    $VFCBREP       0008 10
    $VFC0          0008

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:16 EDT.
Copyright IBM Corporation, 1990, 2020