$MDGBK Back to Index page
 
Prolog 
Control Block Contents 
   $MDGBK 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.


  $MDGBK Prolog Top of page
 
 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 Top of page
 

 $MDGBK DSECT Top of page
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 Top of page
 
          
*** $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 Top of page
 
 
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
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:58:42 EDT.
Copyright IBM Corporation, 1990, 2022