$SCABK 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.

  $SCABK Prolog Top of page
 DESCRIPTION: Relocation mapping for HCPSCABK
 DSECT      : $SCABK
 FUNCTION   : LGRSCABK describes those fields of the SCABK 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 HCPSCABK 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.
  $SCABK Control Block Content Top of page

 $SCABK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $SCABK Relocation mapping for HCPSCABK 00000001 $SCA_VER 1 Mapping version number 0000 0 Signed 2 $SCA_HDRL Header length (in bytes) 0002 2 Signed 2 $SCA_BITL Length of mapped bits (in bytes) 0004 4 Signed 2 $SCA_DATL Length of mapped data (in bytes) 0006 6 Signed 2 * Reserved for future use 00000008 $SCA_HDLN *-$SCABK Length of header (bytes) Bit map: Contains the SCABK flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPSCABK. 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 $SCA_BITS (0) Bit map area 00000000 $SCA_BLEN *-$SCA_BITS Length of bit map area Data: Contains all HCPSCABK 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 $SCA_DATA (0) Start of data map 0008 8 Bitstring 8 $SCAMCN Mask of valid virtual CPU addrs 0010 16 Bitstring 2 $SCAXCOF Offset to SCAXCALL data 00000012 $SCA_LEN *-$SCABK Length of fixed area (is also the offset to $SCAXC) 00000003 $SCA_SZ ($SCA_LEN+7)/8 Size of fixed area (DW) Mapping for SCAXCALL data. 0012 18 Bitstring 1 $SCAXC (0) This data appears VMDCPUCT+1 times 0012 18 Bitstring 4 $SCAXCPUA vCPU address 0016 22 Bitstring 1 $SCAXCALL SCAXCALL value for vCPU 00000005 $SCAXCLEN *-$SCAXC Length of a single entry
  $SCABK Storage Layout Top of page
*** $SCABK - Relocation mapping for HCPSCABK
*     +-------------+-------------+-------------+-------------+
*   0 | $SCA_HDRL   | $SCA_BITL   | $SCA_DATL   |/////////////|
*     +-------------+-------------+-------------+-------------+
*   8 |                       $SCAMCN                         |
*     +-------------+---------------------------+------+------+
*  10 |  $SCAXCOF   |        $SCAXCPUA          |(016) | 17
*     +-------------+---------------------------+------+
*** $SCABK - Relocation mapping for HCPSCABK
  $SCABK Cross Reference Top of page
Symbol         Dspl Value
-------------- ---- -----
$SCA_BITL      0002
$SCA_BITS      0008
$SCA_BLEN      0008 00000000
$SCA_DATA      0008
$SCA_DATL      0004
$SCA_HDLN      0006 00000008
$SCA_HDRL      0000
$SCA_LEN       0010 00000012
$SCA_SZ        0010 00000003
$SCA_VER       0000 00000001
$SCAMCN        0008
$SCAXC         0012
$SCAXCALL      0016
$SCAXCLEN      0016 00000005
$SCAXCOF       0010
$SCAXCPUA      0012
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:56:38 EDT.
Copyright IBM Corporation, 1990, 2013