Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
$VFCBK
Control Block Contents
$VFCBK DSECT
Cross Reference (Contains links to field and bit definitions)
$VFCBK Prolog
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
$VFCBK DSECT
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
*** $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
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
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