$BITMP 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.

  $BITMP Prolog Top of page
 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.
 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 6.3.0 Last updated on 22 May 2013 at 13:56:33 EDT.
Copyright IBM Corporation, 1990, 2013