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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 : HCPVFCBK
DESCRIPTION: VIRTUAL FORMS BUFFER CONTROL BLOCK
DSECT : VFCBK
FUNCTION : CONTAINS THE FORMS CONTROL BUFFER DATA AND CONTROL
INFORMATION FOR A VIRTUAL SPOOLING DEVICE.
LOCATED BY : VDSVFC FIELD OF HCPVDSBK
CREATED BY : HCPSCB - FOR PROCESSING THE LOADBUF COMMAND
DELETED BY : HCPDTD - WHEN THE DEVICE IS DETACHED
RELOCATION CONSIDERATIONS : This control block is relocated as part of a live
guest relocation (LGR). The bits and fields that
need to be relocated are defined in the
corresponding LGRVFCBK COPY file. Whenever changes
are made to this control block, consideration must
be given to any effects these changes will have on
a relocation. If any new fields or bits are
defined, they may need to be relocated. If
existing bits or fields are changed, corresponding
modifications may be required in the LGR version of
this control block. Consider also the effects of
these changes on a relocation involving a back-level
release of CP.
VFCBK Control Block Content
VFCBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure VFCBK VIRTUAL FORMS BUFFER CONTROL BLOCK 0000 0 Character 4 VFCBNAME FCB'S NAME 0004 4 Bitstring 1 VFCBFLAG STATUS FLAGS 1... .... VFCBEOF X'80' VFCBEOF END OF FORMS PASSED ONCE .1.. .... VFCBDIAG X'40' VFCBDIAG USED IN 'READ BUFFER' SUPPORT ..1. .... VFCBFCBV X'20' VFCBFCBV FCB DATA VALID ...1 .... VFCBREP X'10' VFCBREP FCB DATA HAS JUST BEEN REPLACED 0005 5 Bitstring 1 VFCBNUM CHANNEL NUMBER OR SPACE COUNT 0006 6 Signed 2 VFCBPOSN CURRENT LINE NUMBER 0008 8 Signed 4 VFCBWORK (0) WORK WORD 0008 8 Bitstring 1 VFCBPRED THE LAST CCW ISSUED 0009 9 Bitstring 1 * (3) SPACE 000C 12 Signed 4 VFCBRSV1 RESERVED FOR FUTURE IBM USE 0010 16 Signed 2 VFCBLEN LENGTH OF FCB DATA 0012 18 Bitstring 1 VFCBINDX FCB INDEX BYTE VALUE 0013 19 Bitstring 1 * RESERVED FOR FUTURE IBM USE 0014 20 Character 260 VFCBLOAD FORMS CONTROL BUFFER DATA 0118 280 Bitstring 1 * (2) RESERVED FOR FUTURE IBM USE 011A 282 Signed 2 VFCBPGCT CURRENT PAGE COUNT 011C 284 Character 4 VFCBIBUF 'SENSE INTERMEDIATE BUFFER' INFO 0120 288 Dbl-Word 8 VFCBEND (0) END OF VFC BUFFER BLOCK 00000024 VFCBSIZE (*-VFCBK)/8 BLOCK SIZE IN DBLWDS 0014 20 Character 130 VFCBLOD1 FOR CLEARING: FCB 1ST HALF 0096 150 Character 130 VFCBLOD2 FOR CLEARING: FCB 2ND HALF 0014 20 Bitstring 256 VFCBNDAT NORMAL FCB DATA 0114 276 Character 1 VFCBENCH END-OF-FCB FENCE 0115 277 Bitstring 3 * (UNUSED PORTION OF EXTENDED FCB) 0014 20 Bitstring 1 VFCBFMT FCB FORMAT INDICATOR 0000007E VFCBXTND X'7E' VFCBXTND EXTENDED FCB FORMAT 0015 21 Bitstring 1 VFCBFFLG FCB FLAGS ...1 .... VFCBXDUP X'10' VFCBXDUP DUPLICATE COPY ENABLED 1... .... VFCBZERO X'80' VFCBZERO BIT ZERO MUST BE 0 BY DEFINITION 0016 22 Bitstring 1 VFCBCOPY COPY COUNT 0017 23 Bitstring 256 VFCBXDAT EXTENDED FCB: ACTUAL FCB DATA 0117 279 Bitstring 1 VFCBEOFF EXTENDED FCB END-OF-FORMS MARKER 000000FE VFCBXEOF X'FE' VFCBXEOF EXTENDED FCB END-OF-FORMS CODE 011C 284 Signed 2 VFCBFCBP CURRENT FCB POINTER 011E 286 Signed 2 VFCBCPGC CURRENT PAGE COUNTER
VFCBK Storage Layout
*** VFCBK - VIRTUAL FORMS BUFFER CONTROL BLOCK
*
* +---------------------------+------+------+-------------+
* 0 | VFCBNAME |:BFLAG|:BNUM | VFCBPOSN |
* +------+--------------------+------+------+-------------+
* 8 |:BPRED|////////////////////| VFCBRSV1 |
* +------+------+------+------+---------------------------+
* 10 | VFCBLEN |:BINDX|//////| |
* +-------------+------+------+ |
* 18 | |
* = VFCBLOAD =
* | |
* +-------------+-------------+---------------------------+
* 118 |/////////////| VFCBPGCT | VFCBIBUF |
* +-------------+-------------+---------------------------+
*
*** VFCBK - VIRTUAL FORMS BUFFER CONTROL BLOCK
*** Overlay for VFCBLOAD in VFCBK
*
* +---------------------------+
* ... 14 | |
* +---------------------------+ |
* 18 | |
* = VFCBLOD1 =
* | +-------------+
* | | |
* +-----------------------------------------+ |
* 98 | |
* = VFCBLOD2 =
* | |
* +-------------------------------------------------------+
* 118
*
*** Overlay for VFCBLOAD in VFCBK
*** Overlay for VFCBLOAD in VFCBK
*
* +---------------------------+
* ... 14 | |
* +---------------------------+ |
* 18 | |
* = VFCBNDAT =
* | +------+--------------------+
* 110 | |:BENCH|////////////////////|
* +---------------------------+------+--------------------+
* 118
*
*** Overlay for VFCBLOAD in VFCBK
*** Overlay for VFCBLOAD in VFCBK
*
* +------+------+------+------+
* 10 ... 14 |:BFMT |:BFFLG|:BCOPY| |
* +---------------------------+------+------+------+ |
* 18 | |
* = VFCBXDAT =
* | +------+
* 110 | |:BEOFF|
* +------------------------------------------------+------+
* 118
*
*** Overlay for VFCBLOAD in VFCBK
*** Overlay for VFCBIBUF in VFCBK
*
* +-------------+-------------+
* 118 ... 11C | VFCBFCBP | VFCBCPGC |
* +-------------+-------------+
* 120
*
*** Overlay for VFCBIBUF in VFCBK
VFCBK Cross Reference
Symbol Dspl Value -------------- ---- ----- VFCBCOPY 0016 VFCBCPGC 011E VFCBDIAG 0004 40 VFCBENCH 0114 VFCBEND 0120 VFCBEOF 0004 80 VFCBEOFF 0117 VFCBFCBP 011C VFCBFCBV 0004 20 VFCBFFLG 0015 VFCBFLAG 0004 VFCBFMT 0014 VFCBIBUF 011C VFCBINDX 0012 VFCBLEN 0010 VFCBLOAD 0014 VFCBLOD1 0014 VFCBLOD2 0096 VFCBNAME 0000 VFCBNDAT 0014 VFCBNUM 0005 VFCBPGCT 011A VFCBPOSN 0006 VFCBPRED 0008 VFCBREP 0004 10 VFCBRSV1 000C VFCBSIZE 0120 00000024 VFCBWORK 0008 VFCBXDAT 0017 VFCBXDUP 0015 10 VFCBXEOF 0117 000000FE VFCBXTND 0014 0000007E VFCBZERO 0015 80
Copyright IBM Corporation, 1990, 2011