$SSHBK | Back to Index page

| Prolog Control Block Contents $SSHBK DSECT 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.

$SSHBK Prolog | Top of page

     NAME       : LGRSSHBK
     DESCRIPTION: Relocation mapping for the SSHBK array
                  members of HCPSSHBK
     DSECT      : $SSHBK
     FUNCTION   : LGRSSHBK describes those fields of the SSHBK 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 HCPSSHBK 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.

$SSHBK Control Block Content | Top of page

     $SSHBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $SSHBK         Relocation mapping for the SSHBK array
              00000001       $SSH_VER       1 Mapping version number
    0000    0 Signed       2 $SSH_HDRL      Header length (in bytes)
    0002    2 Signed       2 $SSH_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       2 *              Reserved for future use
    0006    6 Signed       2 $SSH_PUC       Processor type for this RDO
              00000008       $SSH_HDLN      *-$SSHBK Length of header (bytes)
          Bit map: Contains the SSHBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPSSHBK.
                   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 $SSH_BITS (0)  Bit map area
    0008    8 Bitstring    1 $SSH0
              1... ....      $SSHLIMH       X'80' $SSHLIMH SSHFLG1
              .1.. ....      $SSHNMSHA      X'40' $SSHNMSHA SSHFLG1
              ..1. ....      $SSHMXSHA      X'20' $SSHMXSHA SSHFLG1
              ...1 ....      $SSHVINV       X'10' $SSHVINV SSHFLG2
              00000001       $SSH_BLEN      *-$SSH_BITS Length of bit map
                                            area
          Data:    Contains all HCPSSHBK 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.
    0009    9 Bitstring    1 $SSH_DATA (0)  Start of data map
    0009    9 Bitstring    4 $SSHNEXT       -> RDO offset to next $SSHBK
    000D   13 Bitstring    4 $SSHRELSH      Rel share setting for this CPU
                                            type
    0011   17 Bitstring    4 $SSHABSSH      Abs share setting for this CPU
                                            type
    0015   21 Bitstring    4 $SSHMXSHR      Max share setting for this CPU
                                            type
              00000019       $SSH_LEN       *-$SSHBK Total length, in bytes
              00000004       $SSH_SZ        ($SSH_LEN+7)/8 Size in
                                            doublewords

$SSHBK Storage Layout | Top of page

    *** $SSHBK - Relocation mapping for the SSHBK array
    *
    *     +-------------+-------------+-------------+-------------+
    *   0 | $SSH_HDRL   | $SSH_BITL   |/////////////|  $SSH_PUC   |
    *     +------+------+-------------+------+------+-------------+
    *   8 |$SSH0 |         $SSHNEXT          |    $SSHRELSH-      |
    *     +------+---------------------------+--------------------+
    *  10 |-(00D)|        $SSHABSSH          |    $SSHMXSHR-      |
    *     +------+---------------------------+--------------------+
    *  18 |-(015)| 19
    *     +------+
    *
    *** $SSHBK - Relocation mapping for the SSHBK array

$SSHBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $SSH_BITL      0002
    $SSH_BITS      0008
    $SSH_BLEN      0008 00000001
    $SSH_DATA      0009
    $SSH_HDLN      0006 00000008
    $SSH_HDRL      0000
    $SSH_LEN       0015 00000019
    $SSH_PUC       0006
    $SSH_SZ        0015 00000004
    $SSH_VER       0000 00000001
    $SSHABSSH      0011
    $SSHLIMH       0008 80
    $SSHMXSHA      0008 20
    $SSHMXSHR      0015
    $SSHNEXT       0009
    $SSHNMSHA      0008 40
    $SSHRELSH      000D
    $SSHVINV       0008 10
    $SSH0          0008

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:14 EDT.
Copyright IBM Corporation, 1990, 2020