$VFCBK Back to Index page
 
Prolog 
Control Block Contents 
   $VFCBK 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.


  $VFCBK Prolog Top of page
 
 NAME       : LGRVFCBK
 DESCRIPTION: Relocation mapping for HCPVFCBK
 DSECT      : $VFCBK
 FUNCTION   : LGRVFCBK describes those fields of the VFCBK 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 : HCPRLFFF - VFCBK 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 HCPVFCBK 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.
 
 
  $VFCBK Control Block Content Top of page
 

 $VFCBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $VFCBK Relocation mapping for HCPVFCBK 00000001 $VFC_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 $VFC_HDRL Header length (in bytes) 0002 2 Signed 2 $VFC_BITL Length of mapped bits (in bytes) 0004 4 Signed 4 * Reserved for future use 00000008 $VFC_HDLN *-$VFCBK Length of header (bytes) Bit map: Contains the VFCBK flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPVFCBK. 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 $VFC_BITS (0) Bit map area 0008 8 Bitstring 1 $VFC0 1... .... $VFCBEOF X'80' $VFCBEOF VFCBFLAG .1.. .... $VFCBDIAG X'40' $VFCBDIAG VFCBFLAG ..1. .... $VFCBFCBV X'20' $VFCBFCBV VFCBFLAG ...1 .... $VFCBREP X'10' $VFCBREP VFCBFLAG 00000001 $VFC_BLEN *-$VFC_BITS Length of bit map area Data: Contains all HCPVFCBK 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 $VFC_DATA (0) Start of data map 0009 9 Bitstring 4 $VFCBNAME FCB'S Name 000D 13 Bitstring 1 $VFCBNUM Channel Number or Space Count 000E 14 Bitstring 2 $VFCBPOSN Current Line Number 0010 16 Bitstring 1 $VFCBPRED The last CCW issued 0011 17 Bitstring 2 $VFCBLEN Length of FCB Data 0013 19 Bitstring 1 $VFCBINDX FCB Index Byte Value 0014 20 Bitstring 260 $VFCBLOAD Forms Control Buffer Data 0118 280 Bitstring 2 $VFCBPGCT Current page count 011A 282 Bitstring 4 $VFCBIBUF 'Sense Intermediate Buffer' Info 0000011E $VFC_LEN *-$VFCBK Total length, in bytes 00000024 $VFC_SZ ($VFC_LEN+7)/8 Size in doublewords
 
 
  $VFCBK Storage Layout Top of page
 
          
*** $VFCBK - Relocation mapping for HCPVFCBK
*
*     +-------------+-------------+---------------------------+
*   0 | $VFC_HDRL   | $VFC_BITL   |///////////////////////////|
*     +------+------+-------------+------+------+-------------+
*   8 |$VFC0 |        $VFCBNAME          |:CBNUM| $VFCBPOSN   |
*     +------+-------------+------+------+------+-------------+
*  10 |(010) |  $VFCBLEN   |(013) |                           |
*     +------+-------------+------+                           |
*  18 |                                                       |
*     =                      $VFCBLOAD                        =
*     |                                                       |
*     +-------------+---------------------------+-------------+
* 118 | $VFCBPGCT   |        $VFCBIBUF          | 11E
*     +-------------+---------------------------+
*
*** $VFCBK - Relocation mapping for HCPVFCBK
 
 
  $VFCBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
$VFC_BITL      0002
$VFC_BITS      0008
$VFC_BLEN      0008 00000001
$VFC_DATA      0009
$VFC_HDLN      0004 00000008
$VFC_HDRL      0000
$VFC_LEN       011A 0000011E
$VFC_SZ        011A 00000024
$VFC_VER       0000 00000001
$VFCBDIAG      0008 40
$VFCBEOF       0008 80
$VFCBFCBV      0008 20
$VFCBIBUF      011A
$VFCBINDX      0013
$VFCBLEN       0011
$VFCBLOAD      0014
$VFCBNAME      0009
$VFCBNUM       000D
$VFCBPGCT      0118
$VFCBPOSN      000E
$VFCBPRED      0010
$VFCBREP       0008 10
$VFC0          0008
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:59:09 EDT.
Copyright IBM Corporation, 1990, 2022