$VDSBK

Prolog  

Control Block Contents  
   $VDSBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

$VDSBK Prolog

 NAME       : LGRVDSBK
 DESCRIPTION: Relocation mapping for HCPVDSBK
 DSECT      : $VDSBK
 FUNCTION   : LGRVDSBK describes those fields of the VDSBK 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 : HCPRLFDF - VDSBK 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 HCPVDSBK 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.

$VDSBK Control Block Content

$VDSBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      $VDSBK         Relocation mapping for HCPVDSBK
          00000001       $VDS_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 $VDS_HDRL      Header length (in bytes)
0002    2 Signed       2 $VDS_BITL      Length of mapped bits (in bytes)
0004    4 Signed       4 *              Reserved for future use
          00000008       $VDS_HDLN      *-$VDSBK Length of header (bytes)
      Bit map: Contains the VDSBK flags that are subject to
               relocation. These bits are defined sequentially,
               regardless of how they are defined in HCPVDSBK.
               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 $VDS_BITS (0)  Bit map area
0008    8 Bitstring    1 $VDS0
          1... ....      $VDSAUCR       X'80' $VDSAUCR VDSCFLG
          00000001       $VDS_BLEN      *-$VDS_BITS Length of bit map
                                        area
      Data:    Contains all HCPVDSBK 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 $VDS_DATA (0)  Start of data map
0009    9 Bitstring    4 $VDSVFC        VFCBK pointer
000D   13 Bitstring    4 $VDSUCSB       UCSB Data Block pointer
          00000011       $VDS_LEN       *-$VDSBK Total length, in bytes
          00000003       $VDS_SZ        ($VDS_LEN+7)/8 Size in
                                        doublewords

$VDSBK Storage Layout

          
*** $VDSBK - Relocation mapping for HCPVDSBK
*
*     +-------------+-------------+---------------------------+
*   0 | $VDS_HDRL   | $VDS_BITL   |///////////////////////////|
*     +------+------+-------------+------+--------------------+
*   8 |$VDS0 |         $VDSVFC           |     $VDSUCSB-      |
*     +------+---------------------------+--------------------+
*  10 |-(00D)| 11
*     +------+
*
*** $VDSBK - Relocation mapping for HCPVDSBK

$VDSBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
$VDS_BITL      0002
$VDS_BITS      0008
$VDS_BLEN      0008 00000001
$VDS_DATA      0009
$VDS_HDLN      0004 00000008
$VDS_HDRL      0000
$VDS_LEN       000D 00000011
$VDS_SZ        000D 00000003
$VDS_VER       0000 00000001
$VDSAUCR       0008 80
$VDSUCSB       000D
$VDSVFC        0009
$VDS0          0008