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


  $DVLBK Prolog Top of page
 
 NAME       : LGRDVLBK
 DESCRIPTION: Relocation mapping for HCPDVLBK
 DSECT      : $DVLBK
 FUNCTION   : LGRDVLBK describes those fields of the DVLBK 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 : HCPRLFLF - DVLBK 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 HCPDVLBK 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.
 
 
  $DVLBK Control Block Content Top of page
 

 $DVLBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $DVLBK Relocation mapping for HCPDVLBK 00000001 $DVL_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 $DVL_HDRL Header length (in bytes) 0002 2 Signed 2 $DVL_BITL Length of mapped bits (in bytes) 0004 4 Signed 4 * Reserved for future use 00000008 $DVL_HDLN *-$DVLBK Length of header (bytes) Bit map: Contains the DVLBK flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPDVLBK. 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 $DVL_BITS (0) Bit map area 00000000 $DVL_BLEN *-$DVL_BITS Length of bit map area Data: Contains all HCPDVLBK 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 $DVL_DATA (0) Start of data map DVL Header definition 0008 8 Bitstring 4 $DVLHFRST First DVLRANGE 000C 12 Bitstring 4 $DVLHSOFR DVLRANGE where GD left off 0010 16 Bitstring 4 $DVLHLAST Last DVLRANGE 0014 20 Bitstring 4 $DVLHMXNM Maximum OK number 0018 24 Bitstring 4 $DVLHADBM Address of Already Done Bit Map 001C 28 Bitstring 4 * Reserved for future IBM use DVL Range definition 0008 8 Bitstring 4 $DVLRNEXT Next DVLRANGE in list 000C 12 Bitstring 4 $DVLRFRST First number in range 0010 16 Bitstring 4 $DVLRSOFR Number where GD left off 0014 20 Bitstring 4 $DVLRLST Last number in range 0018 24 Bitstring 4 $DVLRCNT Count of numbers in range 001C 28 Bitstring 4 $DVLRESET 0 ==> not processed yet 00000020 $DVLBYSZ *-$DVLBK Byte length of $DVLBK 00000004 $DVLSIZE ((*-$DVLBK)+7)/8 DWord length of $DVLBK
 
 
  $DVLBK Storage Layout Top of page
 
          
*** $DVLBK - Relocation mapping for HCPDVLBK
*
*     +-------------+-------------+---------------------------+
*   0 | $DVL_HDRL   | $DVL_BITL   |///////////////////////////|
*     +-------------+-------------+---------------------------+
*   8 |        $DVLHFRST          |        $DVLHSOFR          |
*     +---------------------------+---------------------------+
*  10 |        $DVLHLAST          |        $DVLHMXNM          |
*     +---------------------------+---------------------------+
*  18 |        $DVLHADBM          |///////////////////////////|
*     +---------------------------+---------------------------+
*  20
*
*** $DVLBK - Relocation mapping for HCPDVLBK
          
*** Overlay for $DVL_DATA in $DVLBK
*
*     +---------------------------+---------------------------+
*   8 |        $DVLRNEXT          |        $DVLRFRST          |
*     +---------------------------+---------------------------+
*  10 |        $DVLRSOFR          |         $DVLRLST          |
*     +---------------------------+---------------------------+
*  18 |         $DVLRCNT          |        $DVLRESET          |
*     +---------------------------+---------------------------+
*  20
*
*** Overlay for $DVL_DATA in $DVLBK
 
 
  $DVLBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
$DVL_BITL      0002
$DVL_BITS      0008
$DVL_BLEN      0008 00000000
$DVL_DATA      0008
$DVL_HDLN      0004 00000008
$DVL_HDRL      0000
$DVL_VER       0000 00000001
$DVLBYSZ       001C 00000020
$DVLHADBM      0018
$DVLHFRST      0008
$DVLHLAST      0010
$DVLHMXNM      0014
$DVLHSOFR      000C
$DVLRCNT       0018
$DVLRESET      001C
$DVLRFRST      000C
$DVLRLST       0014
$DVLRNEXT      0008
$DVLRSOFR      0010
$DVLSIZE       001C 00000004
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:58:36 EDT.
Copyright IBM Corporation, 1990, 2022