$SFXBK | Back to Index page

| Prolog Control Block Contents $SFXBK 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.

$SFXBK Prolog | Top of page

     NAME       : LGRSFXBK
     DESCRIPTION: Relocation mapping for HCPSFXBK
     DSECT      : $SFXBK
     FUNCTION   : LGRSFXBK describes those fields of the SFXBK 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 HCPSFXBK 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.

$SFXBK Control Block Content | Top of page

     $SFXBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $SFXBK         Relocation mapping for HCPSFXBK
              00000001       $SFX_VER       1 Mapping version number
    0000    0 Signed       2 $SFX_HDRL      Header length (in bytes)
    0002    2 Signed       2 $SFX_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $SFX_HDLN      *-$SFXBK Length of header (bytes)
          Bit map: Contains the SFXBK flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPSFXBK.
                   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 $SFX_BITS (0)  Bit map area There are no flag
                                            bytes in HCPSFXBK. While there
                                            *are* flag bits defined with the
                                            description to VMDSFIP1. The
                                            definition and description in
                                            HCPSFXBK could use some
                                            clarification.
              00000000       $SFX_BLEN      *-$SFX_BITS Length of bit map
                                            area
          Data:    Contains all HCPSFXBK 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 $SFX_DATA (0)  Start of data map
    0008    8 Bitstring    4 $SFXINEXT      -> RDO offset to next $SFXBK
    000C   12 Bitstring    4 $SFXICMSK      Interrupt codes and mask values
          Notes      : $SFXLDCEF can only occur for a guest which is a host for
                logical devices. However, such guests are not permitted to
                migrate, so all references here to xxxLDCEF are for
                completeness only (as well as being potentially useful in
                the future, should the migration restriction be lifted for
                such guests).
    0010   16 Bitstring    1 $SFXICALL      ID of routine to be called
              .... ....      $SFXNONE       0 $SFXNONE No interrupt reflector
                                            defined
              .... ...1      $SFXLDCEF      1 $SFXLDCEF HCPLDCEF
              .... ..1.      $SFXPCMXI      2 $SFXPCMXI HCPPCMXI
              .... ..11      $SFXSFINT      3 $SFXSFINT HCPSFINT
              .... .1..      $SFXVEXCL      4 $SFXVEXCL HCPVEXCL
              .... .1.1      $SFXVIPIL      5 $SFXVIPIL HCPVIPIL
              .... .11.      $SFXVIPIX      6 $SFXVIPIX HCPVIPIX The contents
                                            of $SFXIPARM are determined by
                                            the value of $SFXICALL:
                                            +-----------+********************
                                            **********------+ | $SFXICALL |
                                            Contents of $SFXIPARM |
                                            +-----------+********************
                                            **********------+ | $SFXNONE | 0
                                            | | $SFXLDCEF | SFXIPARM | |
                                            $SFXPCMXI | SFXIPARM | |
                                            $SFXSFINT | RDO offset to
                                            self-defining parms | | $SFXVEXCL
                                            | RDO offset to a $GSDBK | |
                                            $SFXVIPIL | RDO offset to a
                                            $PPFBK | | $SFXVIPIX | RDO offset
                                            to a $PPFBK |
                                            +-----------+********************
                                            **********------+
    0011   17 Bitstring    4 $SFXIPARM      0, SFXIPARM, or RDO offset
              00000015       $SFX_LEN       *-$SFXBK Total length, in bytes
              00000003       $SFX_SZ        ($SFX_LEN+7)/8 Size in
                                            doublewords

$SFXBK Storage Layout | Top of page

    *** $SFXBK - Relocation mapping for HCPSFXBK
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $SFX_HDRL   | $SFX_BITL   |///////////////////////////|
    *     +-------------+-------------+---------------------------+
    *   8 |        $SFXINEXT          |        $SFXICMSK          |
    *     +------+--------------------+------+--------------------+
    *  10 |(010) |        $SFXIPARM          | 15
    *     +------+---------------------------+
    *
    *** $SFXBK - Relocation mapping for HCPSFXBK

$SFXBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $SFX_BITL      0002
    $SFX_BITS      0008
    $SFX_BLEN      0008 00000000
    $SFX_DATA      0008
    $SFX_HDLN      0004 00000008
    $SFX_HDRL      0000
    $SFX_LEN       0011 00000015
    $SFX_SZ        0011 00000003
    $SFX_VER       0000 00000001
    $SFXICALL      0010
    $SFXICMSK      000C
    $SFXINEXT      0008
    $SFXIPARM      0011
    $SFXLDCEF      0010 01
    $SFXNONE       0010 00
    $SFXPCMXI      0010 02
    $SFXSFINT      0010 03
    $SFXVEXCL      0010 04
    $SFXVIPIL      0010 05
    $SFXVIPIX      0010 06

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:13 EDT.
Copyright IBM Corporation, 1990, 2020