$GSDBK 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.

  $GSDBK Prolog Top of page
 DESCRIPTION: Relocation mapping for HCPGSDBK
 DSECT      : $GSDBK
 FUNCTION   : LGRGSDBK describes those fields of the GSDBK 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 HCPGSDBK 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.
  $GSDBK Control Block Content Top of page

 $GSDBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $GSDBK Relocation mapping for HCPGSDBK 00000001 $GSD_VER 1 Mapping version number 0000 0 Signed 2 $GSD_HDRL Header length (in bytes) 0002 2 Signed 2 $GSD_BITL Length of mapped bits (in bytes) 0004 4 Signed 4 * Reserved for future use 00000008 $GSD_HDLN *-$GSDBK Length of header (bytes) NOTES : This mapping is not intended to be comprehensive, since for the most part the GSDBKs that will be relocated contain simple character strings. The decoding routine(s) on the destination system will be aware of the context for the incoming GSDBK, and will therefore be able to set flags and other data as required. Bit map: Contains the GSDBK flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPGSDBK. 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. Special note concerning GSDFLAG: GSDFLAG is relocated as a byte field, not as individual bits. See the note in the prolog of HCPGSDBK for more details. 0008 8 Signed 2 $GSD_BITS (0) Bit map area 0008 8 Bitstring 1 $GSD0 1... .... $GSDCFMDG X'80' $GSDCFMDG GSDTYPE .1.. .... $GSDCFMCP X'40' $GSDCFMCP GSDTYPE ..1. .... $GSDCFMTR X'20' $GSDCFMTR GSDTYPE ...1 .... $GSD2305 X'10' $GSD2305 GSDTYPE .... 1... $GSDREIPL X'08' $GSDREIPL GSDTYPE .... .1.. $GSDIPLOG X'04' $GSDIPLOG GSDTYPE .... ..1. $GSDLOGIP X'02' $GSDLOGIP GSDTYPE .... ...1 $GSDIRECT X'01' $GSDIRECT GSDTYPE 00000001 $GSD_BLEN *-$GSD_BITS Length of bit map area Data: Contains all HCPGSDBK 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 $GSD_DATA (0) Start of data map 0009 9 Bitstring 4 $GSDNEXT -> RDO offset to next $GSDBK 000D 13 Bitstring 1 $GSDFLAG GSDBK flags 000E 14 Bitstring 2 $GSDSCAN Byte disp of next fld in GSDDATA 0010 16 Bitstring 2 $GSDDCNT Length of GSDDATA in bytes 0012 18 Bitstring 4 $GSDDATA -> RDO offset to variable data 00000016 $GSD_LEN *-$GSDBK Total length, in bytes 00000003 $GSD_SZ ($GSD_LEN+7)/8 Size in doublewords
  $GSDBK Storage Layout Top of page
*** $GSDBK - Relocation mapping for HCPGSDBK
*     +-------------+-------------+---------------------------+
*   0 | $GSD_HDRL   | $GSD_BITL   |///////////////////////////|
*     +------+------+-------------+------+------+-------------+
*   8 |$GSD0 |         $GSDNEXT          |:DFLAG|  $GSDSCAN   |
*     +------+------+--------------------+------+-------------+
*  10 |  $GSDDCNT   |         $GSDDATA          | 16
*     +-------------+---------------------------+
*** $GSDBK - Relocation mapping for HCPGSDBK
  $GSDBK Cross Reference Top of page
Symbol         Dspl Value
-------------- ---- -----
$GSD_BITL      0002
$GSD_BITS      0008
$GSD_BLEN      0008 00000001
$GSD_DATA      0009
$GSD_HDLN      0004 00000008
$GSD_HDRL      0000
$GSD_LEN       0012 00000016
$GSD_SZ        0012 00000003
$GSD_VER       0000 00000001
$GSDCFMCP      0008 40
$GSDCFMDG      0008 80
$GSDCFMTR      0008 20
$GSDDATA       0012
$GSDDCNT       0010
$GSDFLAG       000D
$GSDIPLOG      0008 04
$GSDIRECT      0008 01
$GSDLOGIP      0008 02
$GSDNEXT       0009
$GSDREIPL      0008 08
$GSDSCAN       000E
$GSD0          0008
$GSD2305       0008 10
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