Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### FVSECT

Prolog

Control Block Contents
FVSECT DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### FVSECT Prolog

     NAME       : FVS
     DESCRIPTION: Fixed Variable Storage Work Area
     DSECT      : FVSECT
     FUNCTION   : Workarea for file management
                  routines; must also include the DMSAFT macro.
                  FVSECT is used mainly by file management and
                  I/O routines. FVS contains save areas, work
                  areas, and commonly used constants. A typical
                  use of FVS is when a reentrant I/O routine
                  requires a work area or save area, because the
                  routine cannot modify itself. FVSECT is called
                  by the FVS macro.

#### FVSECT Control Block Content

#### FVSECT DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      FVSECT         Fixed Variable Storage Work Area
    0000    0 Signed       4 DISK$SEG (15)  (1) FOR ACTLKP, TRKLKP, QQTRK
    003C   60 Signed       4 REGSAV3 (15)   (2) FOR STATE
    0078  120 Signed       4 RWFSTRG (18)   (3) REMAINING STORAGE FOR RDBUF,
                                            WRBUF
    00C0  192 Signed       4 FVSBUFSZ       SFS R/W cache size in 4K blocks (
                                            Default is five 4K blocks or 20K)
    00C4  196 Address      4 FVSDAFT        Addr of the first DMSOPEN AFT or
                                            the anchor AFT.
    00C8  200 Address      4 FVSFSER        Address of FS to SFS error data
                                            area (DMSFSERR), this will be
                                            zero until first applicable error
                                            encountered
    00CC  204 Signed       4 FVSFSSZ        Maximum error elements in
                                            DMSFSERR block The default is 11.
    00D0  208 Signed       4 *              RESERVED FOR FUTURE IBM USE
                 SAVE-AREA FOR LOWEST-LEVEL ROUTINES:
                 E.G. READMFD, RELUFD, UPDISK, ADTLKW
    00D4  212 Signed       4 REGSAV0 (15)   -- (1) SAVED R0-R15
    0110  272 Address      3 *              -- (2) FIRST 3 BYTES OF
                                            RETURN-CODE
    0113  275 Address      1 ERRCOD0        -- (3) ERROR-CODE GOES HERE
              000000D4       TRKLSAVE       REGSAV0 FOR TRKLKP/X ONLY WHEN
                                            CALLED BY QQTRK/X
                 SAVE-AREA FOR NEXT-TO-LOWEST LEVEL ROUTINES:
                 E.G. READFST, ERASE, ALTER, INTSVC-LOADMOD
    0114  276 Signed       4 REGSAV1 (15)   -- (1) save R0-R15
    0150  336 Address      3 *              -- (2) first 3 bytes of return
                                            code which are to remain
                                            unchanged
    0153  339 Address      1 ERRCOD1        -- (3) error code goes here
    0154  340 Signed       4 F65535         = X'0000FFFF'
    0158  344 Signed       4 FW4
              00000FW4       HW4            FW4+2 Flag byte indicating that a
                                            module has copied the plist into
                                            the DMSNUCPA area because the
                                            plist was above the line. This
                                            flag byte is currently being used
                                            by DMSSTT, DMSFNS, and DMSERS.
    015C  348 Bitstring    1 NUCPAFLG       DMSNUCPA flag byte
              1... ....      ERSCOPY        X'80' ERASE did a copy
              .1.. ....      FNSCOPY        X'40' FINIS did a copy
              ..1. ....      STTCOPY        X'20' STATE did a copy
    015D  349 Bitstring    3 *              Reserved for future use
    0160  352 Signed       4 F100           -- (2)
    0164  356 Signed       4 *              Reserved for future use
    0168  360 Signed       4 *              Reserved for future IBM use
    016C  364 Signed       4 *              Reserved for future IBM use
    0170  368 Signed       4 *              Reserved for future IBM use
    0174  372 Signed       4 *              Reserved for future IBM use
    0178  376 Signed       4 *              Reserved for future IBM use
    017C  380 Signed       4 *              Reserved for future IBM use
    0180  384 Signed       4 DSKLST (0)     ALL-PURPOSE RDTK/WRTK P-LIST...
    0180  384 Address      4 DSKLOC         CORE LOC. OF ITEM
    0184  388 Address      4 RWCNT          BYTE-COUNT (USUALLY 800)
    0188  392 Address      4 DSKADR         DISK ADDRESS OF ITEM
              1... ....      FWADDR         X'80' IN HIGH BIT OF DSKADDR
                                            INDICATES EXTENDED DIO PLIST
                                            (FULLWORD DISK ADR, PTR SIZE AND
                                            PLIST CHAIN POINTER)
    018C  396 Address      4 ADTADD         ADDRESS OF CORRECT
                                            ACTIVE-DISK-TABLE
    0190  400 Signed       4 DSKPTRSZ       DSK POINTER SIZE IF F/W ADDR
    0194  404 Address      4 DSKCHAIN       PLIST CHAIN POINTER
    0198  408 Signed       4 DSKLST2 (0)    ALL-PURPOSE RDTK/WRTK P-LIST
    0198  408 Address      4 DSKLOC2        CORE LOC. OF ITEM
    019C  412 Address      4 RWCNT2         BYTE-COUNT
    01A0  416 Address      4 DSKADR2        DISK ADDRESS OF ITEM
    01A4  420 Address      4 ADTADD2        ADDR OF ADT (NOT USED IN CHAINED
                                            PLISTS)
    01A8  424 Signed       4 DSKPTRS2       DSK POINTER SIZE IF F/W ADDR
    01AC  428 Address      4 DSKCHAI2       PLIST CHAIN POINTER
              00000018       DSKLEN         (DSKCHAI2+4)-DSKLST2 Length of
                                            RDTK PLIST
    01B0  432 Character    8 FINISLST       P-LIST TO CLOSE ALL FILES
    01B8  440 Character    8 *
    01C0  448 Character    8 *
    01C8  456 Character    2 *
    01CA  458 Signed       2 * (0)          HALFWORD CONSTANTS ...
    01CA  458 Bitstring    2 FFF            MEANS NO SIGNIFICANT DATA PAST
                                            215TH BYTE
    01CC  460 Bitstring    2 FFE            1968-ERA MFD STILL SUPPORTED ON
                                            INPUT ONLY
    01CE  462 Bitstring    2 FFD            NEWEST SIGNAL FOR FULL 2314
                                            HANDLING NOTE: 2314 DASD is not
                                            supported
                 'SIGNAL' = SCRATCH HALFWORD USED BY READMFD OR ERASE...
    01D0  464 Signed       2 SIGNAL         = 0000, X'FFFF', X'FFFE', OR
                                            X'FFFD'
              00SIGNAL       SWTCH          SIGNAL+1 00, FF, FE, OR FD
    01D2  466 Bitstring    1 UFDBUSY        NONZERO MEANS 'UFD IS BUSY BEING
                                            UPDATED'
    01D3  467 Bitstring    1 KXFLAG         'KX' FLAGS
              1... ....      KXWANT         X'80' KX WANTED ASAP
              .... ...1      KXWSVC         X'01' HOLD KX UNTIL ANY SVC
                                            ACTIVITY
    01D4  468 Bitstring    1 FVSFLG0        FLAG FOR GENERAL COMUNICATION
                 Flag bits for FVSFLG0
              .... ...1      FVSACCM0       X'01' When on, indicate that fm 0
                                            files can be included for R/O
                                            accessed disk.
    01D5  469 Bitstring    1 FLGSAVE        FOR SCRATCH USE (E.G. BY RELUFD)
                 FLAG BITS FOR 'UFDBUSY' FLAG
              1... ....      WRBIT          X'80' WRBUF
              .1.. ....      UPBIT          X'40' UPDISK - READMFD
              ..1. ....      FNBIT          X'20' FINIS
              ...1 ....      ERBIT          X'10' ERASE - ALTER - READFST
              .... 1...      DIOBIT         X'08' RDTK/WRTK THE FOLLOWING
                                            BITS ARE FOR ROUTINES WHICH DO
                                            NOT UPDATE THE DISK, BUT WHICH
                                            CAN'T BE INTERRUPTED BY A KX
                                            ANYWAY.
              .... ..1.      ABNBIT         X'02' DMSABN -- ABEND RECOVERY
                                            ROUTINE
              .... ...1      ITSBIT         X'01' DMSITS -- SVC HANDLING
                                            ROUTINE
    01D6  470 Bitstring    1 FVSFLAG        (FOR GENERAL USE - AS NEEDED)
                 MISCELLANEOUS STORAGE USED BY ERASE (OR ALTER) ....
    01D7  471 Bitstring    1 ERSFLAG        FLAG FOR USE BY ERASE OR ALTER
    01D8  472 Signed       4 FVSERAS0       R0 at entry to ERASE
    01DC  476 Signed       4 FVSERAS1       R1 at entry to ERASE
    01E0  480 Signed       4 FVSERAS2       Address of ERASE work area
    01E4  484 Signed       4 FVSERAS3       Address of copied extended plist
    01E8  488 Signed       4 FVSERAS4       reserved for use by ERASE
    01EC  492 Signed       4 FVSERAS5       reserved for use by ERASE
    01F0  496 Signed       4 *              Reserved for future IBM use
    01F4  500 Signed       4 FVSERAS6       reserved for use by ERASE
            FILE STATUS TABLE (FST) COPY FROM "STATE"
    01F8  504 Dbl-Word     8 STATEFST (0)   FST OF 'STATED' FILE
                 CDF FST COPY (40 BYTES)
                 (returned on FSSTATE and FSOPEN without FORM=E)
    01F8  504 Dbl-Word     8 FVSFSTN        FILENAME -0
    0200  512 Dbl-Word     8 FVSFSTT        FILETYPE -8
    0208  520 Signed       2 FVSFSTDT (2)   DATE/TIME LAST WRITTEN -16,18
    020C  524 Signed       2 FVSFSTWP       WRITE POINTER (ITEM ID) -20
    020E  526 Signed       2 FVSFSTRP       READ POINTER (ITEM ID) -22
    0210  528 Signed       2 FVSFSTM        FILEMODE -24
    0212  530 Signed       2 FVSFSTIC       N'ITEMS IN FILE -26
    0214  532 Signed       2 FVSFSTCL       DA(FIRST CHAIN LINK) -28
    0216  534 Character    1 FVSFSTFV       FIXED(F) / VARIABLE(V) INDICATOR
                                            -30
    0217  535 Bitstring    1 FVSFSTFB       FLAG BYTE -31
    0218  536 Signed       4 FVSFSTIL       L'ITEMS -32
    021C  540 Signed       2 FVSFSTDB       N'DATA BLOCKS -36
    021E  542 Character    1 FVSFSTYR (2)   YEAR LAST WRITTEN -38 Note there
                                            is a flag bit in FVSFSTFB X'08'
                                            that corresponds to FVSFSTYR
                                            indicating the century (0=19,
                                            1=20)
              00000028       FVSL1          *-STATEFST LENGTH OF SHORT FST
                 POINTERS ASSOCIATED WITH BOTH FST VERSIONS
    0220  544 Address      4 FVSFSTAD       A(ADT FOR THIS FILE)
              FVSFSTAD       STATER0        FVSFSTAD
    0224  548 Address      4 FVSFSTAC       A(REAL FST ENTRY FOR THIS FILE)
              FVSFSTAC       STATER1        FVSFSTAC
    0228  552 Signed       4 * (2)          Reserved for future IBM use
                 EDF/SFS FST COPY (80 BYTES)
    0230  560 Dbl-Word     8 STATFST2 (0)   EDF FORMAT FST COPY
          FILE STATUS TABLE (FILE DIRECTORY) BLOCK
    0230  560 Signed       4 * (0)
    0230  560 Character   16 FVSNT (0)      Filename and file type
    0230  560 Character    8 FVSN           FILE NAME
    0238  568 Character    8 FVST           FILE TYPE
              0000FVST       FVSDIRN        FVSN,16 Subdirectory name
    0240  576 Signed       4 FVSD           DATE/TIME LAST WRITTEN
    0244  580 Signed       2 FVSWP          WRITE POINTER (ITEM #)
    0246  582 Signed       2 FVSRP          READ POINTER (ITEM #)
              000FVSRP       FVSBFOWN       FVSD,8 Base file owner
    0248  584 Signed       2 FVSM           File mode and mode number. Mode
                                            number will be blank for DIRs.
              00000248       FVSMCHAR       FVSM,1 File mode character
              00000249       FVSMNUM        FVSM+1,1 File mode number
    024A  586 Signed       2 FVSIC          ITEM COUNT, zero for directories
              000FVSIC       FVSCDFMR       65533 maximum valid record number
                                            for CDF files
    024C  588 Signed       2 FVSFCL         FIRST CHAIN LINK
              00FVSFCL       FVSSCID        FVSIC,4 Something Changed ID
    024E  590 Character    1 FVSFV          Type of FST flag field
                 FSTFV flag -byte definitions
              000000C6       FVSFVFIX       C'F' FIXED file FST
              000000E5       FVSFVVAR       C'V' VARIABLE file FST
              000000C4       FVSFVDIR       C'D' DIRECTORY FST
              00000060       FVSFVERS       C'-' Erased or revoked alias FST
    024F  591 Bitstring    1 FVSFB          Flag byte (if used)
                 "FSTFB" FLAG-BYTE DEFINITIONS
                 (APPLICABLE ONLY TO "STATEFST" COPY OF FST-ENTRY
                 AFTER SUCCESSFUL "STATE" OR "STATEW" CALL.)
              .... ....      FVSFRO         X'00' READ-ONLY DISK
              .1.. ....      FVSFROX        X'40' READ-ONLY EXTENSION OF
                                            READ-ONLY DISK
              ...1 ....      FVSFBSFS       X'10' Shared File FST
              1... ....      FVSFRW         X'80' READ-WRITE DISK
              11.. ....      FVSFRWX        X'C0' READ-ONLY EXTENSION OF
                                            READ-WRITE DISK
              .... 1...      FVSCNTRY       X'08' CENTURY FOR DATE LAST
                                            WRITTEN (0=19, 1=20), CORRESPONDS
                                            TO FSTYR, FSTADATI.
              .... .111      FVSFACT        X'07' FILE "ACTIVE" - ONE OF THE
                                            FOLLOWING:
              .... .1..      FVSFAR         X'04' FILE ACTIVE FOR READING
              .... ..1.      FVSFAW         X'02' FILE ACTIVE FOR WRITING
              .... ...1      FVSFAP         X'01' FILE ACTIVE FROM A "POINT"
                 APPLICABLE TO FSCBFLG IN PLIST
              ..1. ....      FVSEPL         X'20' EXTENDED PLIST
              .1.. ....      FVSITAV        X'40' ITEM AVAILABLE
              .... ...1      FVSRECAV       X'01' PREVIOUS RECORD NULL
    0250  592 Signed       4 FVSIL          (MAXIMUM) ITEM LENGTH
    0254  596 Signed       2 FVSDBC         NUMBER OF DATA BLOCKS
    0256  598 Signed       2 FVSYR          YEAR
              000FVSYR       FVSTID         FVSDBC,4 Tupple Identifier
              00000028       FVSL           *-FVSN FST EDF EXTENSION
    0258  600 Signed       4 FVSFOP         ALT. FILE ORIGIN POINTER, will be
                                            zero for directories
    025C  604 Signed       4 FVSADBC        ALT. NUMBER OF DATA BLOCKS, will
                                            be zero for directories
    0260  608 Signed       4 FVSAIC         ALT. ITEM COUNT, will be zero for
                                            directories
    0264  612 Bitstring    1 FVSNLVL        NUMBER OF POINTER BLOCK LEVELS,
                                            zero for directories
    0265  613 Bitstring    1 FVSPTRSZ       LENGTH OF A POINTER ELEMENT, zero
                                            for directories
    0266  614 Character    6 FVSADATI       ALT. DATE/TIME(YY MM DD HH MM SS)
              FVSADATI       FVSFDATE       FVSADATI,3 Date
              FVSADATI       FVSFTIME       FVSADATI+3,3 Time
    026C  620 Signed       4 FVSEDFEN
    026C  620 Character    1 FVSREALM       Real filemode
    026D  621 Bitstring    1 FVSFLAG2       FST flag byte 2
              ...1 ....      FVSPIPEU       X'10' Reserved for CMS PIPELINES
                                            usage
    026E  622 Character    2 *              - Reserved -
              00000040       FVSL2          *-FVSN LENGTH OF AN EDF FST.
    026C  620 Bitstring    8 FVSOID         Object identifier
    0274  628 Bitstring    8 FVSBFOID       Base file identifier
           The bits in the authority flag byte are mutually
           exclusive.
    027C  636 Bitstring    1 FVSFB1         authority flag byte
              1... ....      FVSFB1RD       X'80' Read authority for this
                                            file
              .1.. ....      FVSFB1WR       X'40' Write authority for this
                                            file No Authority to this file
                                            when FB1RD and FB1WR are off
              ..1. ....      FVSFB1EX       X'20' ESM-protected file
    027D  637 Bitstring    1 FVSFB2         status flag byte
              1... ....      FVSFB2ER       X'80' Erased Alias indicator
              .1.. ....      FVSFB2RV       X'40' Revoked Alias indicator
              ..1. ....      FVSFB2BF       X'20' Base file indicator
              ...1 ....      FVSFB2AL       X'10' Alias fst indicator
              .... 1...      FVSFB2SD       X'08' Subdirectory fst indicator
              .... .1..      FVSFB2DC       X'04' Dircontrol subdirectory
                                            Note. FB2DC = on implies that
                                            FB2SD = on.
              .... ..1.      FVSFB2MG       X'02' Migrated file
              .... ...1      FVSFB2EO       X'01' External Object
    027E  638 Bitstring    1 FVSFB3         extended attribute flag byte
              1... ....      FVSFB3IP       X'80' file has the INPLACE
                                            attribute
              .1.. ....      FVSFB3MA       X'40' module file with long name
                                            alias
              ..1. ....      FVSFB3IV       X'20' FST invalid (during cache
                                            update -DMSJCM only)
              .... 1...      FVSCDOLR       X'08' CENTURY FOR DATE LAST
                                            REFERENCE (0=19, 1=20),
                                            CORRESPONDS TO FSTDOLR.
    027F  639 Character    1 *              -RESERVED-
              00000050       FVSL3          *-FVSN Length of a Shared file
                                            FST
    0280  640 Signed       4 FVSDSFOP       Data space file origin pointer
    0284  644 Character    3 FVSDOLR        Date of last reference
    0287  647 Character    1 *              -RESERVED-
              00000058       FVSL4          *-FVSN Length of an SFS data
                                            space FST
              00000288       FVSNDFST       * END OF FST COPIES IN FVS
              00000090       FVSENDST       FVSNDFST-STATEFST length of
                                            STATEFST in bytes
              00000012       FVSNDSTD       (FVSENDST+7)/8 length of STATEFST
                                            in dwords
              00000005       FVSELMNT       5 NUMBER OF FVS DIO PLISTS IN
                                            MULTI-ELEMENT CHAINED PLIST
              00000006       FVSELMNL       6 LENGTH OF A DIO PLIST ELEMENT
    0288  648 Signed       4 FVSDIOPL (30)  IO MULTI-ELEMENT PLIST.
    0300  768 Signed       4 * (16)         Reserved for future IBM use
    0340  832 Dbl-Word     8 FVSPATCH (0)   PATCH AREA FOR CMS NUC
    0340  832 Character    8 *              EYE CATCHER
    0348  840 Signed       4 FVSFNSST       Storage chain anchor for FNS
    034C  844 Signed       4 * (19)         PATCH AREA
    0398  920 Signed       4 FVSACFR (15)   Save regs 0-14 for DMSACF
    03D4  980 Address      2 *
    03D6  982 Bitstring    1 FVSFLG1        Flag byte FLAG BIT FOR FVSFLG1
              1... ....      FVSSEGC        X'80' DMSARESG invoked (via
                                            SEGMENT)
              .1.. ....      FVSPURC        X'40' segment purge invoked (in
                                            DMSALU)
    03D7  983 Address      1 FVSACFE        Save reg.15 (error) for DMSACF
    03D8  984 Signed       4 FVSACGR (15)   Save regs 0-14 for DMSACG
    0414 1044 Address      3 *
    0417 1047 Address      1 FVSACGE        Save reg. 15 (error) for DMSACG
    0418 1048 Signed       4 FVSLAD (16)    Save area for DMSLAD
    0458 1112 Signed       4 FVSAAFT (0)    Anchor to the AFT chain; maps to
                                            the first 12 bytes of an AFT
    0458 1112 Address      4 *              Forward pointer
    045C 1116 Address      4 *              backward pointer
    0460 1120 Character    3 *              eyecatcher for AFT
    0463 1123 Bitstring    1 *              INDICATE ANCHOR FOR AFTS. IF THIS
                                            EQUATE CHANGES, MUST CHANGE
                                            EQUATE IN FIELD AFTANCHR IN THE
                                            DMSAFT MACRO AND DMSAFTP COPY.
    0464 1124 Address      4 FVSNUAFT       ptr to the chain of unused
                                            preallocated AFTS or zero if all
                                            are being used
    0468 1128 Address      4 FVSRDAFT       addr of AFT last read from or
                                            zero if no open AFTs
    046C 1132 Address      4 FVSWRAFT       addr of AFT last written to or
                                            zero if no open AFTs
    0470 1136 Address      4 FVSCFST        addr of current FST
    0474 1140 Address      4 FVSCHBA        addr of current FST hyperblock
    0478 1144 Signed       4 FVSLADU (16)   Save area for DMSLADU
    04B8 1208 Character   88 FVSLFSCP       Copy of FST in a data space
                                            returned by FST Lookup (DMSLFS)
    0510 1296 Signed       4 FVSMDBSZ       Minidisk cache size in KB
                                            (Default is 8KB)
    0514 1300 Bitstring    1 FVSMISCF       Miscellaneous file system flags
              1... ....      FVSNORAS       X'80' Disable FST verification in
                                            DMSAUD
    0515 1301 Bitstring    3 *              Reserved for future IBM Use
    0518 1304 Signed       4 * (3)          Reserved for future IBM Use

#### FVSECT Storage Layout

    *** FVSECT - Fixed Variable Storage Work Area
    *
    *     +-------------------------------------------------------+
    *   0 |                                                       |
    *     =                       DISK$SEG                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    *  40 |                                                       |
    *     =                       REGSAV3                         =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *  78 |                                                       |
    *     =                       RWFSTRG                         =
    *     |                                                       |
    *     +---------------------------+---------------------------+
    *  C0 |         FVSBUFSZ          |         FVSDAFT           |
    *     +---------------------------+---------------------------+
    *  C8 |         FVSFSER           |         FVSFSSZ           |
    *     +---------------------------+---------------------------+
    *  D0 |///////////////////////////|                           |
    *     +---------------------------+                           |
    *  D8 |                                                       |
    *     =                       REGSAV0                         =
    *     |                                                       |
    *     +--------------------+------+---------------------------+
    * 110 |////////////////////|:COD0 |                           |
    *     +--------------------+------+                           |
    * 118 |                                                       |
    *     =                       REGSAV1                         =
    *     |                                                       |
    *     +--------------------+------+---------------------------+
    * 150 |////////////////////|:COD1 |          F65535           |
    *     +--------------------+------+------+--------------------+
    * 158 |           FW4             |:PAFLG|////////////////////|
    *     +---------------------------+------+--------------------+
    * 160 |           F100            |///////////////////////////|
    *     +---------------------------+---------------------------+
    * 168 |///////////////////////////|///////////////////////////|
    *     +---------------------------+---------------------------+
    * 170 |///////////////////////////|///////////////////////////|
    *     +---------------------------+---------------------------+
    * 178 |///////////////////////////|///////////////////////////|
    *     +---------------------------+---------------------------+
    * 180 |          DSKLOC           |          RWCNT            |
    *     +---------------------------+---------------------------+
    * 188 |          DSKADR           |          ADTADD           |
    *     +---------------------------+---------------------------+
    * 190 |         DSKPTRSZ          |         DSKCHAIN          |
    *     +---------------------------+---------------------------+
    * 198 |         DSKLOC2           |          RWCNT2           |
    *     +---------------------------+---------------------------+
    * 1A0 |         DSKADR2           |         ADTADD2           |
    *     +---------------------------+---------------------------+
    * 1A8 |         DSKPTRS2          |         DSKCHAI2          |
    *     +---------------------------+---------------------------+
    * 1B0 |                       FINISLST                        |
    *     +-------------------------------------------------------+
    * 1B8 |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    * 1C0 |///////////////////////////////////////////////////////|
    *     +-------------+-------------+-------------+-------------+
    * 1C8 |/////////////|    FFF      |    FFE      |    FFD      |
    *     +-------------+------+------+------+------+------+------+
    * 1D0 |   SIGNAL    |:BUSY |KXFLAG|:FLG0 |:SAVE |:FLAG |:FLAG |
    *     +-------------+------+------+------+------+------+------+
    * 1D8 |         FVSERAS0          |         FVSERAS1          |
    *     +---------------------------+---------------------------+
    * 1E0 |         FVSERAS2          |         FVSERAS3          |
    *     +---------------------------+---------------------------+
    * 1E8 |         FVSERAS4          |         FVSERAS5          |
    *     +---------------------------+---------------------------+
    * 1F0 |///////////////////////////|         FVSERAS6          |
    *     +---------------------------+---------------------------+
    * 1F8 |                       FVSFSTN                         |
    *     +-------------------------------------------------------+
    * 200 |                       FVSFSTT                         |
    *     +---------------------------+-------------+-------------+
    * 208 |         FVSFSTDT          |  FVSFSTWP   |  FVSFSTRP   |
    *     +-------------+-------------+-------------+------+------+
    * 210 |  FVSFSTM    |  FVSFSTIC   |  FVSFSTCL   |:FSTFV|:FSTFB|
    *     +-------------+-------------+-------------+------+------+
    * 218 |         FVSFSTIL          |  FVSFSTDB   |  FVSFSTYR   |
    *     +---------------------------+-------------+-------------+
    * 220 |         FVSFSTAD          |         FVSFSTAC          |
    *     +---------------------------+---------------------------+
    * 228 |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    * 230 |                         FVSN                          |
    *     +-------------------------------------------------------+
    * 238 |                         FVST                          |
    *     +---------------------------+-------------+-------------+
    * 240 |           FVSD            |   FVSWP     |   FVSRP     |
    *     +-------------+-------------+-------------+------+------+
    * 248 |    FVSM     |   FVSIC     |   FVSFCL    |FVSFV |FVSFB |
    *     +-------------+-------------+-------------+------+------+
    * 250 |          FVSIL            |   FVSDBC    |   FVSYR     |
    *     +---------------------------+-------------+-------------+
    * 258 |          FVSFOP           |         FVSADBC           |
    *     +---------------------------+------+------+-------------+
    * 260 |          FVSAIC           |:NLVL |:PTRSZ|   (266)-    |
    *     +---------------------------+------+------+-------------+
    * 268 |        -FVSADATI          |         FVSEDFEN          |
    *     +---------------------------+---------------------------+
    * 270
    *
    *** FVSECT - Fixed Variable Storage Work Area

    *** Overlay for FVSEDFEN in FVSECT
    *
    *                                 +------+------+-------------+
    * 268 ...                     26C |:REALM|:FLAG2|/////////////|
    *                                 +------+------+-------------+
    * 270
    *
    *** Overlay for FVSEDFEN in FVSECT

    *** Overlay for FVSEDFEN in FVSECT
    *
    *                                 +---------------------------+
    *     ...                     26C |         FVSOID-           |
    *     +---------------------------+---------------------------+
    * 270 |          -(26C)           |        FVSBFOID-          |
    *     +---------------------------+------+------+------+------+
    * 278 |          -(274)           |FVSFB1|FVSFB2|FVSFB3|//////|
    *     +---------------------------+------+------+------+------+
    * 280 |         FVSDSFOP          |      FVSDOLR       |//////|
    *     +---------------------------+--------------------+------+
    * 288 |                                                       |
    *     =                       FVSDIOPL                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    * 300 |///////////////////////////////////////////////////////|
    *     =///////////////////////////////////////////////////////=
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    * 340 |///////////////////////////////////////////////////////|
    *     +---------------------------+---------------------------+
    * 348 |         FVSFNSST          |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    * 350 |///////////////////////////////////////////////////////|
    *     =///////////////////////////////////////////////////////=
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    * 398 |                                                       |
    *     =                       FVSACFR                         =
    *     |                           +-------------+------+------+
    * 3D0 |                           |/////////////|:FLG1 |:ACFE |
    *     +---------------------------+-------------+------+------+
    * 3D8 |                                                       |
    *     =                       FVSACGR                         =
    *     |                           +--------------------+------+
    * 410 |                           |////////////////////|:ACGE |
    *     +---------------------------+--------------------+------+
    * 418 |                                                       |
    *     =                        FVSLAD                         =
    *     |                                                       |
    *     +---------------------------+---------------------------+
    * 458 |///////////////////////////|///////////////////////////|
    *     +--------------------+------+---------------------------+
    * 460 |////////////////////|//////|         FVSNUAFT          |
    *     +--------------------+------+---------------------------+
    * 468 |         FVSRDAFT          |         FVSWRAFT          |
    *     +---------------------------+---------------------------+
    * 470 |         FVSCFST           |         FVSCHBA           |
    *     +---------------------------+---------------------------+
    * 478 |                                                       |
    *     =                       FVSLADU                         =
    *     |                                                       |
    *     +-------------------------------------------------------+
    * 4B8 |                                                       |
    *     =                       FVSLFSCP                        =
    *     |                                                       |
    *     +---------------------------+------+--------------------+
    * 510 |         FVSMDBSZ          |:MISCF|////////////////////|
    *     +---------------------------+------+--------------------+
    * 518 |///////////////////////////////////////////////////////|
    *     |///////////////////////////+---------------------------+
    *     |///////////////////////////| 524
    *     +---------------------------+
    *
    *** Overlay for FVSEDFEN in FVSECT

#### FVSECT Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    ABNBIT         01D5 02
    ADTADD         018C
    ADTADD2        01A4
    DIOBIT         01D5 08
    DISK$SEG       0000
    DSKADR         0188
    DSKADR2        01A0
    DSKCHAIN       0194
    DSKCHAI2       01AC
    DSKLEN         01AC 00000018
    DSKLOC         0180
    DSKLOC2        0198
    DSKLST         0180
    DSKLST2        0198
    DSKPTRSZ       0190
    DSKPTRS2       01A8
    ERBIT          01D5 10
    ERRCOD0        0113
    ERRCOD1        0153
    ERSCOPY        015C 80
    ERSFLAG        01D7
    FFD            01CE
    FFE            01CC
    FFF            01CA
    FINISLST       01B0
    FLGSAVE        01D5
    FNBIT          01D5 20
    FNSCOPY        015C 40
    FVSAAFT        0458
    FVSACCM0       01D4 01
    FVSACFE        03D7
    FVSACFR        0398
    FVSACGE        0417
    FVSACGR        03D8
    FVSADATI       0266
    FVSADBC        025C
    FVSAIC         0260
    FVSBFOID       0274
    FVSBFOWN       0246 000FVSRP
    FVSBUFSZ       00C0
    FVSCDFMR       024A 000FVSIC
    FVSCDOLR       027E 08
    FVSCFST        0470
    FVSCHBA        0474
    FVSCNTRY       024F 08
    FVSD           0240
    FVSDAFT        00C4
    FVSDBC         0254
    FVSDIOPL       0288
    FVSDIRN        0238 0000FVST
    FVSDOLR        0284
    FVSDSFOP       0280
    FVSEDFEN       026C
    FVSELMNL       0287 00000006
    FVSELMNT       0287 00000005
    FVSENDST       0287 00000090
    FVSEPL         024F 20
    FVSERAS0       01D8
    FVSERAS1       01DC
    FVSERAS2       01E0
    FVSERAS3       01E4
    FVSERAS4       01E8
    FVSERAS5       01EC
    FVSERAS6       01F4
    FVSFACT        024F 07
    FVSFAP         024F 01
    FVSFAR         024F 04
    FVSFAW         024F 02
    FVSFB          024F
    FVSFBSFS       024F 10
    FVSFB1         027C
    FVSFB1EX       027C 20
    FVSFB1RD       027C 80
    FVSFB1WR       027C 40
    FVSFB2         027D
    FVSFB2AL       027D 10
    FVSFB2BF       027D 20
    FVSFB2DC       027D 04
    FVSFB2EO       027D 01
    FVSFB2ER       027D 80
    FVSFB2MG       027D 02
    FVSFB2RV       027D 40
    FVSFB2SD       027D 08
    FVSFB3         027E
    FVSFB3IP       027E 80
    FVSFB3IV       027E 20
    FVSFB3MA       027E 40
    FVSFCL         024C
    FVSFDATE       0266 FVSADATI
    FVSFLAG        01D6
    FVSFLAG2       026D
    FVSFLG0        01D4
    FVSFLG1        03D6
    FVSFNSST       0348
    FVSFOP         0258
    FVSFRO         024F 00
    FVSFROX        024F 40
    FVSFRW         024F 80
    FVSFRWX        024F C0
    FVSFSER        00C8
    FVSFSSZ        00CC
    FVSFSTAC       0224
    FVSFSTAD       0220
    FVSFSTCL       0214
    FVSFSTDB       021C
    FVSFSTDT       0208
    FVSFSTFB       0217
    FVSFSTFV       0216
    FVSFSTIC       0212
    FVSFSTIL       0218
    FVSFSTM        0210
    FVSFSTN        01F8
    FVSFSTRP       020E
    FVSFSTT        0200
    FVSFSTWP       020C
    FVSFSTYR       021E
    FVSFTIME       0266 FVSADATI
    FVSFV          024E
    FVSFVDIR       024E 000000C4
    FVSFVERS       024E 00000060
    FVSFVFIX       024E 000000C6
    FVSFVVAR       024E 000000E5
    FVSIC          024A
    FVSIL          0250
    FVSITAV        024F 40
    FVSL           0256 00000028
    FVSLAD         0418
    FVSLADU        0478
    FVSLFSCP       04B8
    FVSL1          021E 00000028
    FVSL2          026E 00000040
    FVSL3          027F 00000050
    FVSL4          0287 00000058
    FVSM           0248
    FVSMCHAR       0248 00000248
    FVSMDBSZ       0510
    FVSMISCF       0514
    FVSMNUM        0248 00000249
    FVSN           0230
    FVSNDFST       0287 00000288
    FVSNDSTD       0287 00000012
    FVSNLVL        0264
    FVSNORAS       0514 80
    FVSNT          0230
    FVSNUAFT       0464
    FVSOID         026C
    FVSPATCH       0340
    FVSPIPEU       026D 10
    FVSPTRSZ       0265
    FVSPURC        03D6 40
    FVSRDAFT       0468
    FVSREALM       026C
    FVSRECAV       024F 01
    FVSRP          0246
    FVSSCID        024C 00FVSFCL
    FVSSEGC        03D6 80
    FVST           0238
    FVSTID         0256 000FVSYR
    FVSWP          0244
    FVSWRAFT       046C
    FVSYR          0256
    FWADDR         0188 80
    FW4            0158
    F100           0160
    F65535         0154
    HW4            0158 00000FW4
    ITSBIT         01D5 01
    KXFLAG         01D3
    KXWANT         01D3 80
    KXWSVC         01D3 01
    NUCPAFLG       015C
    REGSAV0        00D4
    REGSAV1        0114
    REGSAV3        003C
    RWCNT          0184
    RWCNT2         019C
    RWFSTRG        0078
    SIGNAL         01D0
    STATEFST       01F8
    STATER0        0220 FVSFSTAD
    STATER1        0224 FVSFSTAC
    STATFST2       0230
    STTCOPY        015C 20
    SWTCH          01D0 00SIGNAL
    TRKLSAVE       0113 000000D4
    UFDBUSY        01D2
    UPBIT          01D5 40
    WRBIT          01D5 80

This information is based on z/VM V5R2.0.
Last updated on 6 Dec 2005 at 15:39:50 EDT.
Copyright IBM Corporation, 1990, 2005