$MSTBK

Prolog  

Control Block Contents  
   $MSTBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

$MSTBK Prolog

 NAME       : LGRMSTBK
 DESCRIPTION: Relocation mapping for HCPMSTBK
 DSECT      : $MSTBK
 FUNCTION   : LGRMSTBK describes those fields of the MSTBK 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 HCPMSTBK 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.

$MSTBK Control Block Content

$MSTBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      $MSTBK         Relocation mapping for HCPMSTBK
          00000001       $MST_VER       1 Mapping version number
0000    0 Signed       2 $MST_HDRL      Header length (in bytes)
0002    2 Signed       2 $MST_BITL      Length of mapped bits (in bytes)
0004    4 Signed       4 *              Reserved for future use
          00000008       $MST_HDLN      *-$MSTBK Length of header (bytes)
      NOTES      : This mapping is not intended to be comprehensive,
            since for the most part the MSTBKs that will be
            relocated contain simple character strings. The
            decoding routine(s) on the destination system will
            be aware of the context for the incoming MSTBK, and
            will therefore be able to set flags and other data
            as required.
      Bit map: Contains the MSTBK flags that are subject to
               relocation. These bits are defined sequentially,
               regardless of how they are defined in HCPMSTBK.
               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 $MST_BITS (0)  Bit map area
          00000000       $MST_BLEN      *-$MST_BITS Length of bit map
                                        area
      Data:    Contains all HCPMSTBK 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 $MST_DATA (0)  Start of data map
0008    8 Bitstring    4 $MSTPTR        -> RDO offset to next $MSTBK
000C   12 Bitstring    4 $MSTTLEN       Message length
0010   16 Bitstring    6 $MSTCFRPM      HCPCFRWT parameters
0016   22 Bitstring    4 $MSTTEXT       -> RDO offset to message text
                                        block
          0000001A       $MST_LEN       *-$MSTBK Fixed length, in bytes
          00000004       $MST_SZ        ($MST_LEN+7)/8 Size in
                                        doublewords

$MSTBK Storage Layout

          
*** $MSTBK - Relocation mapping for HCPMSTBK
*
*     +-------------+-------------+---------------------------+
*   0 | $MST_HDRL   | $MST_BITL   |///////////////////////////|
*     +-------------+-------------+---------------------------+
*   8 |         $MSTPTR           |         $MSTTLEN          |
*     +---------------------------+-------------+-------------+
*  10 |               $MSTCFRPM                 | $MSTTEXT-   |
*     +-------------+---------------------------+-------------+
*  18 |   -(016)    | 1A
*     +-------------+
*
*** $MSTBK - Relocation mapping for HCPMSTBK

$MSTBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
$MST_BITL      0002
$MST_BITS      0008
$MST_BLEN      0008 00000000
$MST_DATA      0008
$MST_HDLN      0004 00000008
$MST_HDRL      0000
$MST_LEN       0016 0000001A
$MST_SZ        0016 00000004
$MST_VER       0000 00000001
$MSTCFRPM      0010
$MSTPTR        0008
$MSTTEXT       0016
$MSTTLEN       000C