$TPCBK Back to Index page
Control Block Contents 
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.

  $TPCBK Prolog Top of page
 DESCRIPTION: Relocation mapping for HCPTPCBK
 DSECT      : $TPCBK
 FUNCTION   : LGRTPCBK describes those fields of the TPCBK 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.
 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 HCPTPCBK 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.
  $TPCBK Control Block Content Top of page

 $TPCBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $TPCBK Relocation mapping for HCPTPCBK 00000001 $TPC_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 $TPC_HDRL Header length (in bytes) 0002 2 Signed 2 $TPC_BITL Length of mapped bits (in bytes) 0004 4 Signed 4 * Reserved for future use 00000008 $TPC_HDLN *-$TPCBK Length of header (bytes) Bit map: Contains the TPCBK flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPTPCBK. 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 $TPC_BITS (0) Bit map area 00000000 $TPC_BLEN *-$TPC_BITS Length of bit map area Data: Contains all HCPTPCBK 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 $TPC_DATA (0) Start of data map 0008 8 Bitstring 96 $TPCBLOCK 8 12-byte PATHING INFO entries 00000068 $TPCBYSZ *-$TPCBK Byte length of $TPCBK 0000000D $TPCSIZE ((*-$TPCBK)+7)/8 DWord length of $TPCBK
  $TPCBK Storage Layout Top of page
*** $TPCBK - Relocation mapping for HCPTPCBK
*     +-------------+-------------+---------------------------+
*   0 | $TPC_HDRL   | $TPC_BITL   |///////////////////////////|
*     +-------------+-------------+---------------------------+
*   8 |                                                       |
*     =                      $TPCBLOCK                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  68
*** $TPCBK - Relocation mapping for HCPTPCBK
  $TPCBK Cross Reference Top of page
Symbol         Dspl Value
-------------- ---- -----
$TPC_BITL      0002
$TPC_BITS      0008
$TPC_BLEN      0008 00000000
$TPC_DATA      0008
$TPC_HDLN      0004 00000008
$TPC_HDRL      0000
$TPC_VER       0000 00000001
$TPCBLOCK      0008
$TPCBYSZ       0008 00000068
$TPCSIZE       0008 0000000D
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:56:39 EDT.
Copyright IBM Corporation, 1990, 2013