$MDGBK

Prolog  

Control Block Contents  
   $MDGBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

$MDGBK Prolog

 NAME       : LGRMDGBK
 DESCRIPTION: Relocation mapping for HCPMDGBK
 DSECT      : $MDGBK
 FUNCTION   : LGRMDGBK describes those fields of the MDGBK 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 HCPMDGBK 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.

$MDGBK Control Block Content

$MDGBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      $MDGBK         Relocation mapping for HCPMDGBK
          00000001       $MDG_VER       1 Mapping version number
0000    0 Signed       2 $MDG_HDRL      Header length (in bytes)
0002    2 Signed       2 $MDG_BITL      Length of mapped bits (in bytes)
0004    4 Signed       4 *              Reserved for future use
          00000008       $MDG_HDLN      *-$MDGBK Length of header (bytes)
      Bit map: Contains the MDGBK flags that are subject to
               relocation. These bits are defined sequentially,
               regardless of how they are defined in HCPMDGBK.
               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 $MDG_BITS (0)  Bit map area
0008    8 Bitstring    1 $MDG0
          1... ....      $MDG_CONFIG    X'80' $MDG_CONFIG MDG_STATUS
          00000001       $MDG_BLEN      *-$MDG_BITS Length of bit map
                                        area
      Data:    Contains all HCPMDGBK 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.
0009    9 Bitstring    1 $MDG_DATA (0)  Start of data map
0009    9 Bitstring    4 $MDG_NEXT      -> RDO offset to next $MDGBK
000D   13 Bitstring    8 $MDG_APBUF_GAA1_G
                                        Guest abs addr 1st appl buffer
0015   21 Bitstring    8 $MDG_APBUF_GAA2_G
                                        Guest abs addr 2nd appl buffer
001D   29 Bitstring   16 $MDG_PROD_ID   Application product/release id
002D   45 Bitstring    2 $MDG_BUFF_LEN  Total len (bytes) of appl buffer
002F   47 Bitstring    2 $MDG_BUFF_LEN1 Length (bytes) of 1st buffer page
0031   49 Bitstring    2 $MDG_BUFF_LEN2 Length (bytes) of 2nd buffer page
          00000033       $MDG_LEN       *-$MDGBK Total length, in bytes
          00000007       $MDG_SZ        ($MDG_LEN+7)/8 Size in
                                        doublewords

$MDGBK Storage Layout

          
*** $MDGBK - Relocation mapping for HCPMDGBK
*
*     +-------------+-------------+---------------------------+
*   0 | $MDG_HDRL   | $MDG_BITL   |///////////////////////////|
*     +------+------+-------------+------+--------------------+
*   8 |$MDG0 |        $MDG_NEXT          |      (00D)-        |
*     +------+---------------------------+--------------------+
*  10 |       -$MDG_APBUF_GAA1_G         |      (015)-        |
*     +----------------------------------+--------------------+
*  18 |       -$MDG_APBUF_GAA2_G         |                    |
*     +----------------------------------+                    |
*     |                     $MDG_PROD_ID                      |
*     |                                  +-------------+------+
*  28 |                                  |$MDG_BUFF_LEN|(02F)-|
*     +------+-------------+-------------+-------------+------+
*  30 |-(02F)|:G_BUFF_LEN2 | 33
*     +------+-------------+
*
*** $MDGBK - Relocation mapping for HCPMDGBK

$MDGBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
$MDG_APBUF_GAA1_G
               000D
$MDG_APBUF_GAA2_G
               0015
$MDG_BITL      0002
$MDG_BITS      0008
$MDG_BLEN      0008 00000001
$MDG_BUFF_LEN  002D
$MDG_BUFF_LEN1
               002F
$MDG_BUFF_LEN2
               0031
$MDG_CONFIG    0008 80
$MDG_DATA      0009
$MDG_HDLN      0004 00000008
$MDG_HDRL      0000
$MDG_LEN       0031 00000033
$MDG_NEXT      0009
$MDG_PROD_ID   001D
$MDG_SZ        0031 00000007
$MDG_VER       0000 00000001
$MDG0          0008