$CRWBK 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.

  $CRWBK Prolog Top of page
 DESCRIPTION: Relocation mapping for HCPCRWBK
 DSECT      : $CRWBK
 FUNCTION   : LGRCRWBK describes those fields of the CRWBK 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 HCPCRWBK 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.
  $CRWBK Control Block Content Top of page

 $CRWBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $CRWBK Relocation mapping for HCPCRWBK 00000001 $CRW_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 $CRW_HDRL Header length (in bytes) 0002 2 Signed 2 $CRW_BITL Length of mapped bits (in bytes) 0004 4 Signed 4 * Reserved for future use 00000008 $CRW_HDLN *-$CRWBK Length of header (bytes) Bit map: Contains the CRWBK flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPCRWBK. 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 $CRW_BITS (0) Bit map area 00000000 $CRW_BLEN *-$CRW_BITS Length of bit map area Data: Contains all HCPCRWBK 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 $CRW_DATA (0) Start of data map 0008 8 Bitstring 1 $CRWFLAGS Channel report codes 0009 9 Bitstring 1 $CRWEFLD CRW Error Recovery Information 000A 10 Bitstring 2 $CRWRSID Resource ID Code 000C 12 Bitstring 4 $CRWNEXT Next CRW pointer 00000010 $CRW_LEN *-$CRWBK Total length, in bytes 00000002 $CRW_SZ ($CRW_LEN+7)/8 Size in doublewords
  $CRWBK Storage Layout Top of page
*** $CRWBK - Relocation mapping for HCPCRWBK
*     +-------------+-------------+---------------------------+
*   0 | $CRW_HDRL   | $CRW_BITL   |///////////////////////////|
*     +------+------+-------------+---------------------------+
*   8 |(008) |:WEFLD|  $CRWRSID   |         $CRWNEXT          |
*     +------+------+-------------+---------------------------+
*  10
*** $CRWBK - Relocation mapping for HCPCRWBK
  $CRWBK Cross Reference Top of page
Symbol         Dspl Value
-------------- ---- -----
$CRW_BITL      0002
$CRW_BITS      0008
$CRW_BLEN      0008 00000000
$CRW_DATA      0008
$CRW_HDLN      0004 00000008
$CRW_HDRL      0000
$CRW_LEN       000C 00000010
$CRW_SZ        000C 00000002
$CRW_VER       0000 00000001
$CRWEFLD       0009
$CRWFLAGS      0008
$CRWNEXT       000C
$CRWRSID       000A
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:56:34 EDT.
Copyright IBM Corporation, 1990, 2013