$SCABK

Prolog  

Control Block Contents  
   $SCABK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

$SCABK Prolog

 NAME       : LGRSCABK
 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

$SCABK DSECT

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

          
*** $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

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