$BITMP | Back to Index page

| Prolog Control Block Contents $BITMP 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.

$BITMP Prolog | Top of page

     NAME       : LGRBITMP
     DESCRIPTION: Relocation mapping for HCPBITMP
     DSECT      : $BITMP
     FUNCTION   : LGRBITMP describes those fields of the BITMP 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.
     CREATED BY : HCPRLFLF - BITMP Formatter for LGR
     DELETED BY : HCPRLDRL - Release storage associated with an RDP
     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 HCPBITMP 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.

$BITMP Control Block Content | Top of page

     $BITMP DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      $BITMP         Relocation mapping for HCPBITMP
              00000001       $BIT_VER       1 Mapping version number for this
                                            DSECT. Version is independent of
                                            the CP level and need only be
                                            changed when this DSECT is
                                            changed. The convention is to
                                            increment by 1.
    0000    0 Signed       2 $BIT_HDRL      Header length (in bytes)
    0002    2 Signed       2 $BIT_BITL      Length of mapped bits (in bytes)
    0004    4 Signed       4 *              Reserved for future use
              00000008       $BIT_HDLN      *-$BITMP Length of header (bytes)
          Bit map: Contains the BITMP flags that are subject to
                   relocation. These bits are defined sequentially,
                   regardless of how they are defined in HCPBITMP.
                   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 $BIT_BITS (0)  Bit map area
    0008    8 Bitstring    1 $BIT0
              1... ....      $BITHDR        X'80' $BITHDR 1=This is a BIT
                                            Header record 0=This is a BIT
                                            Range record space 1
              00000001       $BIT_BLEN      *-$BIT_BITS Length of bit map
                                            area
          Data:    Contains all HCPBITMP 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 $BIT_DATA (0)  Start of data map
    0009    9 Bitstring    4 $BITMPMAX      The max bit number allowed
    000D   13 Bitstring    4 $BITMPPGS      How many pointers at BITMPPTR
    0011   17 Bitstring    4 $BITMPP1L      Low half-page of bitmap frame
    0015   21 Bitstring    4 $BITMPP1H      High half-page of bitmap frame
              00000019       $BITBYSZ       *-$BITMP Byte length of $BITMP
              00000004       $BITSIZE       ((*-$BITMP)+7)/8 DWord length of
                                            $BITMP

$BITMP Storage Layout | Top of page

    *** $BITMP - Relocation mapping for HCPBITMP
    *
    *     +-------------+-------------+---------------------------+
    *   0 | $BIT_HDRL   | $BIT_BITL   |///////////////////////////|
    *     +------+------+-------------+------+--------------------+
    *   8 |$BIT0 |        $BITMPMAX          |    $BITMPPGS-      |
    *     +------+---------------------------+--------------------+
    *  10 |-(00D)|        $BITMPP1L          |    $BITMPP1H-      |
    *     +------+---------------------------+--------------------+
    *  18 |-(015)| 19
    *     +------+
    *
    *** $BITMP - Relocation mapping for HCPBITMP

$BITMP Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    $BIT_BITL      0002
    $BIT_BITS      0008
    $BIT_BLEN      0008 00000001
    $BIT_DATA      0009
    $BIT_HDLN      0004 00000008
    $BIT_HDRL      0000
    $BIT_VER       0000 00000001
    $BITBYSZ       0015 00000019
    $BITHDR        0008 80
    $BITMPMAX      0009
    $BITMPPGS      000D
    $BITMPP1H      0015
    $BITMPP1L      0011
    $BITSIZE       0015 00000004
    $BIT0          0008

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:01 EDT.
Copyright IBM Corporation, 1990, 2020