NAME       : HCPTCMBK
 DESCRIPTION: Full Track Cache Main Control Block
 DSECT      : TCMBK
 FUNCTION   : This block is used to keep track of global
              information associated with the full track
              caching including cache management and hash
              table.
 LOCATED BY : This DSECT overlays the data entry point
              HCPTCMST.
 CREATED BY : HCPTCM is loaded by the system during IPL.
              The TCMBK is initialized by HCPFTHIN.
 DELETED BY : Never deleted.
 RELOCATION CONSIDERATIONS : None

 TCMBK DSECT
Top of page

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      TCMBK          Full Track Cache Main Control Block
0000    0 Bitstring    1 * (256)        Skip prolog and align for cache
                    Start of Assembler Version
       Frequently used fields are clustered at the start of
       this block for cache efficiency.
0100  256 Dbl-Word     8 * (0)          Actual TCMBK data
0100  256 Signed       4 TCMTSLK        Hash table/cache lock byte.
                                        Hierarchically above TCMPTELK.
                                        Also contains a footprint of the
                                        location in the module which last
                                        obtained or released lock.
0104  260 Address      1 TCMFLAGS       Flag byte
       Bits in TCMFLAGS:
          1... ....      TCMCACHE       X'80' Caching is enabled
          .1.. ....      TCMTHUD        X'40' Unconditional deletes
                                        allowed.
          ..1. ....      TCMFSL         X'20' Flag is set when the fair
                                        share limit was calculated last
                                        time in HCPSTP. Only calculate it
                                        every other time
          ...1 ....      TCMDMDC        X'10' User issued SET MDC or
                                        RETAIN XSTORE cmd to alter MDC
                                        XSTORE size.
          .... 1...      TCMONDEF       X'08' Deferred on is set, The
                                        cache will be turned on as soon
                                        as the last access of the cache
                                        is completed and the cache
                                        flushed.
          .... .1..      TCMSTLX        X'04' XSTORE steal in progress
          .... ..1.      TCMSTLM        X'02' Main storage steal in
                                        progress
0105  261 Bitstring    1 TCMFLAG2       More TCMBK flag bits
       Bits in TCMFLAG2:
          1... ....      TCMHSHEX       X'80' Hash table is in the
                                        process of expanding. No new
                                        inserts or track accesses are
                                        allowed during expansion, only
                                        track deletions are allowed until
                                        expansion is complete.
          .1.. ....      TCMEFAIL       X'40' Hash expansion failed
                                        during this 30 second interval
          ..1. ....      TCMFLUSH       X'20' Tells HCPFMVST to call
                                        HCPFMVFX when done.
          ...1 ....      TCMMSEME       X'10' MDC main storage steal has
                                        been called for an emergency main
                                        storage shortage condition within
                                        the last 60 second interval.
0106  262 Signed       2 TCMPRIME       Prime number used in hash
0108  264 Address      4 TCMHMASK       Mask to create address of 1st lvl
                                        index
             Hash table and values required to perform hash
          00000004       TCMINISZ       4 Initial hash size TCMINISZ *
                                        2**N = TCMMAXSZ (N is an integer)
          00000040       TCMMAXSZ       64 Max first level indexes. See
                                        TCMINISZ for limits
010C  268 Bitstring    4 TCMIXMSK       Mask for device tbl index See
                                        also TCHIXMSK
          ..11 1111      TCMIXTST       X'3F' Mask for device tbl index
0110  272 Signed       4 TCMRDCT        Count of successful read accesses
                                        to MDC records
0114  276 Signed       4 TCMIA          IOs avoided by MDC hits
0118  280 Signed       4 TCMINOTA       I/Os not avoided TCMIA + TCMINOTA
                                        = MDC eligible
      TCMALMSK and TCMALSHF are used to convert the TCHASPAC
      (address space selection) bits into a displacement into
      the ALET/STO array starting at TCMALET1.
011C  284 Bitstring    4 TCMALMSK       Mask to isolate TCHASPAC bits
                                        i.e. AL1(0,0,0,TCHASPAC)
          00000003       TCMALSHF       3 Used to SRL the isolated
                                        TCHASPAC bits to form a
                                        displacement from TCMALET1
      The following ALET/STO pairs are mapped by MDAS DSECT
      Serialized by TCMPTELK and the TCMNEWAS lock when adding
      new address spaces.
0120  288 Signed       4 TCMALET1       ALET for 1st MDC address space
0124  292 Signed       4 TCMSTO1        STO for 1st MDC address space
0128  296 Signed       4 TCMALET2       ALET for 2nd MDC address space
012C  300 Signed       4 TCMSTO2        STO for 2nd MDC address space
0130  304 Signed       4 TCMALET3       ALET for 3rd MDC address space
0134  308 Signed       4 TCMSTO3        STO for 3rd MDC address space
0138  312 Signed       4 TCMALET4       ALET for 4th MDC address space
013C  316 Signed       4 TCMSTO4        STO for 4th MDC address space
0140  320 Address      4 TCMHPPT (64)   First level index. Each word
                                        points to a hash segment (3
                                        pages)
          0000023C       TCMEOIX        *-4 Pointer to last possible hash
                                        table index
          0000000A       TCMPSHFT       10 Shift value used to split
                                        hashed key into segment ix and
                                        relative entry within the segment
          0000000A       TCMGPSHF       10 Number of TCHENTRYs per 3-page
                                        group, i.e. per entry in HCPHPPT,
                                        as a shift value (2**10=1024)
          00000400       TCMTCHPG       1024 Number of TCHENTRYs per
                                        3-page group, i.e. per entry in
                                        HCPHPPT. (2**TCMGPSHF)
0240  576 Address      2 TCMBSEGS       Count base hash table segments
0242  578 Signed       2 *              Reserved for IBM use
      The following are Full Track Cache Hash Table Performance
      Related Counters.
0244  580 Signed       4 TCMRDAB        Count of times that read
                                        simulation was aborted
0248  584 Signed       4 TCMCOLPG       Hash table collision pages.
                                        Actually HSHAV blocks.
024C  588 Signed       4 TCMINSCT       Hash table insertions of new
                                        TCHBKs (aka the track insertion
                                        rate)
0250  592 Signed       4 TCMDELCT       Count of cache TCHBK deletions
0254  596 Signed       4 TCMDELST       Count of TCHBK deletes by the
                                        steal function
0258  600 Signed       4 TCMGCFRM       Count of Garbage collected frms
025C  604 Signed       4 TCMCOLCT       Hash table collisions on
                                        insertion of new item
0260  608 Signed       4 TCMPFCT        Count of times page fault
                                        accessed track in cache
0264  612 Signed       4 TCMRDER        Count of times that add of track
                                        to cache failed (due to i/o error
                                        etc )
0268  616 Signed       4 TCMSTKRD       Count of times a CPEBK was
                                        deferred on a track (reads)
026C  620 Signed       4 TCMSTKEX       Count of times a CPEBK was
                                        deferred on a track (writes)
0270  624 Signed       4 TCMSTKPF       Count of times a CPEBK was
                                        deferred on a track (page fault
                                        priority)
0274  628 Signed       4 TCMSTKUD       Count of times an unconditional
                                        delete was deferred
0278  632 Signed       4 TCMEXCT        Count of successfull excl. access
                                        to track
027C  636 Signed       4 TCMDCCT        Count of times track deleted
                                        after excl. access
0280  640 Signed       4 TCMUDFST       Count of fast unconditional
                                        deletes performed
0284  644 Signed       4 TCMUDMLT       Count of cache unconditional
                                        delete requests (multi-track)
0288  648 Signed       4 TCMEFCT        Hash expansion failure count
028C  652 Signed       4 TCMCPURG       Count of times cache purged due
                                        to write link on another system
                                        in the SSI cluster
      End of Performance related counts.
      Next fields are for available TCHBK list management.
      and hash table expansion.
0290  656 Address      4 TCMAVLST       Available list head. This is the
                                        anchor for the collision node
                                        (CNODE) available list.
0294  660 Address      4 TCMAVPAG       Available pages (HSHAV blocks).
                                        Each block containing available
                                        list nodes is linked together.
0298  664 Address      4 TCMALTBK       Alternate TCMBK, the alternate
                                        TCMBK is used during hash table
                                        expansion and will become the
                                        current one after expansion is
                                        complete.
      Below are values for the full track cache address space.
029C  668 Bitstring    1 TCMPTELK       Lock for PTE sets and address
                                        space create. Also see the
                                        TCMNEWAS lock for A/S create.
                                        Hierarchically below TCMTSLK. If
                                        no MDC tasks are outstanding,
                                        TCMTSLK held is equivalent to
                                        holding both locks as no new work
                                        can start without the main cache
                                        lock.
029D  669 Bitstring    3 *              Reserved for IBM use
02A0  672 Signed       4 TCMSEGTE       Queue of available SEGTE sets
02A4  676 Address      4 TCMLASTA       Address of last ALET/STO pair
                                        currently in use
02A8  680 Character   80 TCMPTES (0)    Mapped by PTESET DSECT
02A8  680 Signed       4 TCMPTE8 (4)    PTE subbks for 8 pages/track
02B8  696 Address      2 *              Count of PTEs in this set
02BA  698 Address      2 *              Max sets/page of size 8
02BC  700 Signed       4 TCMPTE10 (4)   PTE subbks for 10 pages/track
02CC  716 Address      2 *              Count of PTEs in this set
02CE  718 Address      2 *              Max sets/page of size 10
02D0  720 Signed       4 TCMPTE12 (4)   PTE subbks for 12 pages/track
02E0  736 Address      2 *              Count of PTEs in this set
02E2  738 Address      2 *              Max sets/page for size 12
02E4  740 Signed       4 TCMPTE14 (4)   PTE subbks for 14 pages/track
02F4  756 Address      2 *              Count of PTEs in this set
02F6  758 Address      2 *              Max sets/page of size 14
02F8  760 Signed       2 TCMRDVID       Next RDEV ID to give out
                                        Serialized by TCMTSLK.
02FA  762 Bitstring    2 TCMMAXID       Maximum RDEV ID
02FC  764 Character   24 TCMASNAM
030D  781 Character    1 TCMASNUM       Address space number
      8 FBA pages make up a "track" in full track cache.
      With CKD it is known that if one page is referenced on a
      track, it is likely that others on that track will be
      referenced.  This information is not known for FBA.
      Therefore we wanted to keep the number of pages per FBA
      track small.
          00000040       TCMBKPTK       64 Number of FBA blocks per
                                        "track". MDC does not use blocks
                                        per cyclical group since a track
                                        would not necessarily be
                                        page-aligned.
          00000008       TCMPGPTK       8 Number of pages needed to read
                                        in an FBA "track".
          00000006       TCMFBSHF       6 Shift factor to determine FBA
                                        "track" number from an FBA block
                                        number. Thus 1 FBA track is 8
                                        pages: 2**6=64, 64*512
                                        bytes/block=32K
0314  788 Signed       4 TCMMNBLW       Current number of pages in main
                                        storage < 2G being used as
                                        track cache pages
0318  792 Signed       4 TCMMNABV       Current number of pages in main
                                        storage >= 2G being used as
                                        track cache pages
031C  796 Address      4 *              Reserved for IBM use
      Main storage steal information.  This information is
      mapped by SDDATA DSECT.
0320  800 Dbl-Word     8 TCMMDATA (0)   Location of main storage steal
                                        information
0320  800 Bitstring    4 TCMMIDSZ       Maximum allowable number of pages
                                        in track cache (based on average
                                        age of a page in DPA). AKA "ideal
                                        main store cache size", set by
                                        arbiter logic in HCPSTP.
0324  804 Signed       4 TCMMAIN        Current number of pages in main
                                        storage being used as track cache
                                        pages. = TCMMNBLW+TCMMNABV
0328  808 Signed       4 TCMMNMIN       Minimum number of main storage
                                        pages used by cache as set by
                                        user command
032C  812 Signed       4 TCMMNMAX       Maximum number of main storage
                                        pages used by cache as set by
                                        user command
0330  816 Signed       4 TCMMNDL        Number of main storage pages
                                        stolen from cache
0334  820 Signed       4 TCMSTLMN       Number of times pages steal was
                                        invoked to steal main storage
                                        pages from the track cache
0338  824 Address      4 TCMMCPE        Address of CPEBK to stack to
                                        invoke main storage steal
033C  828 Signed       4 TCMSTLFR       Number of times page steal was
                                        invoked to steal a specific FRMTE
                                        from the track cache.
      TCMSTFRM is used by MDC main storage steal to contain the
               address of the next FRMTE on the MDC cyclic
               list to be processed.
             - is used by MDC vacator function to contain the
               address of the next FRMTE on the MDC cyclic
               list to be processed.
0340  832 Address      8 TCMSTFRM (0)
0340  832 Address      8 *              Addr of next FRMTE to steal ...
                                        from for main storage steal
      TCMFRANC is the MDC cyclic list FRMTEs representing main
               storage frames used to hold user data in MDC.
               The 1st 2 dwords are a forward and backward ptr.
               The 3rd dword is 0 to represent a FRMTE without
               a FRMDCKEY.  End of the queue is indicated by a
               pointer to this anchor.
0348  840 Address      8 TCMFRANC (0)   Equivalent of 3 ADs follow
0348  840 Address      8 *              Anchor for MDC FRMTEs - fwd ptr
0350  848 Address      8 *              Anchor for MDC FRMTEs - back ptr
0358  856 Address      4 *              Reserved/skipped in FRMTE def'n
035C  860 Address      4 *              Represent a FRMTE w/o a FRMDCKEY
      XSTORE steal information.  This information is mapped
      by SDDATA DSECT.
0360  864 Dbl-Word     8 TCMXDATA (0)   Location of XSTORE steal
                                        information
0360  864 Signed       4 TCMXIDSZ       Maximum allowable number of
                                        XSTORE blocks in track cache
                                        (based on avg age of XSTORE
                                        block). AKA "ideal xstore cache
                                        size", set by arbiter logic in
                                        HCPSTP.
0364  868 Signed       4 TCMXSTOR       Number of cache pages that live
                                        on XSTORE
0368  872 Signed       4 TCMXSMIN       Minimum number of XSTORE blocks
                                        used by cache as set by user
                                        command
036C  876 Signed       4 TCMXSMAX       Maximum number of XSTORE blocks
                                        used by cache ase set by user
                                        command
0370  880 Signed       4 TCMXSTDL       Number of XSTORE blocks stolen
                                        from track cache
0374  884 Signed       4 TCMSTLXS       Number of times pages steal was
                                        invoked to steal XSTORE blocks
                                        from the track cache
0378  888 Address      4 TCMXCPE        Address of CPEBK to stack to
                                        invoke Xstorage steal
                                        >>>> This field is
                                        not used. It is defined primarily
                                        >>>> to maintain the
                                        similar mapping of fields
                                        >>>> between the
                                        Storage and the XStorage
                                        sections.
037C  892 Address      4 *              Reserved for IBM use
0380  896 Signed       4 TCMSTXTC       Address of next TCHBK to steal
                                        from for XSTORE block steal
0384  900 Signed       4 TCMSTXHP       Address of hash page currently
                                        stealing from for XSTORE block
                                        steal
      End of steal information.
0388  904 Signed       4 TCM2IO         Number of times had to do both
                                        STD and non-STD I/O
038C  908 Signed       4 TCMKLNT0       Number of times key length was
                                        not 0 when doing STD I/O
0390  912 Signed       4 TCMDLBAD       Number of times data length not
                                        consistent when doing standard
                                        I/O
0394  916 Signed       4 TCMBADR0       Number of times record 0's length
                                        was greater than X'10'
0398  920 Signed       4 TCMRCBAD       Number of times records were not
                                        sequential when doing standard
                                        I/O
039C  924 Signed       4 TCMBADCC       Number of times cylinder and head
                                        weren't the same for each record
                                        on track
03A0  928 Signed       4 TCMREADS       Count of successful read channel
                                        programs simulated
03A4  932 Signed       4 TCMNOPTE       Count of times we ran out of PTE
                                        sets
03A8  936 Signed       2 *              Reserved for IBM use
03AA  938 Signed       2 TCMAXSCT       Count of hash entries that need
                                        to be flushed but are currently
                                        active
03AC  940 Signed       4 TCMNOTEL       Number of channel programs that
                                        were not eligible for channel
                                        program simulation
03B0  944 Signed       4 TCMFSHVM       Number of fair share cache
                                        inserters during this fair share
                                        interval
03B4  948 Signed       4 TCMFSHIN       Number of fair share track
                                        inserts during this fair share
                                        interval
03B8  952 Signed       4 TCMNFSVM       Number of non-fair share cache
                                        inserters during this fair share
                                        interval
03BC  956 Signed       4 TCMNFSIN       Number of non-fair share track
                                        inserts during this fair share
                                        interval
03C0  960 Signed       4 TCMFSLIM       Fair share insert limit for this
                                        interval
03C4  964 Signed       4 TCMFSLMM       Minimum fair share insert limit
                                        per interval
03C8  968 Signed       4 TCMSFSIN       Smoothed previous number of fair
                                        share inserts
03CC  972 Signed       4 TCMSSMIN       Smoothed previous number of all
                                        (both fair share and non-fair
                                        share) inserts
03D0  976 Signed       4 TCMFSLEX       Count of tracks not inserted due
                                        to fair share limit
03D4  980 Signed       4 TCMTFBA        Count of track inserts done with
                                        FBA channel prg
03D8  984 Signed       4 TCMTCKST       Count of standard track inserts
                                        done with CKD channel program
03DC  988 Signed       4 TCMTCKNS       Count of non-std track inserts
                                        done with CKD channel program
03E0  992 Signed       4 TCMTECST       Count of standard track inserts
                                        done with ECKD channel program
03E4  996 Signed       4 TCMTECNS       Count of non-std track inserts
                                        done with ECKD channel program
03E8 1000 Signed       4 TCMPIN4K       Count of page faults resolved
                                        with 4K aligned PGIN for standard
                                        track
03EC 1004 Signed       4 TCMPOU4K       Count of page faults resolved
                                        with 4K aligned PGOUT for
                                        standard track
03F0 1008 Signed       4 TCMPINVA       Count of page faults resolved
                                        with PGIN to validate page for
                                        std track (non-4K case)
03F4 1012 Signed       4 TCMPSTRD       Count of page faults resolved
                                        with read from DASD for std track
03F8 1016 Signed       4 TCMPSTWR       Count of page faults requesting
                                        DASD write (which are ignored)
03FC 1020 Signed       4 TCMPFNS        Count of page faults for
                                        non-standard tracks
0400 1024 Signed       4 TCMNOINS       Count of track inserts rejected
                                        because user's insert capability
                                        off
0404 1028 Signed       4 *              Reserved for IBM use
0408 1032 Dbl-Word     8 TCMONTOD       Last time cache was enabled via
                                        SET MDC or RETAIN command. Cache
                                        is not necessarily active yet.
0410 1040 Dbl-Word     8 TCMOFTOD       Last time cache was disabled via
                                        SET MDC command. Cache is not
                                        necessarily flushed yet.
0418 1048 Dbl-Word     8 TCMXSTOD       Last time hash table expansion
                                        started successfully.
0420 1056 Dbl-Word     8 TCMXETOD       Last time hash table expansion
                                        completed.
0428 1064 Dbl-Word     8 TCMQSTOD       Last time hash table quiesce
                                        started.
0430 1072 Dbl-Word     8 TCMQETOD       Last time hash table quiesce
                                        completed as TCMAXSCT went to
                                        zero.
0438 1080 Dbl-Word     8 TCMFLTOD       Last time all the data in all the
                                        cache address spaces was flushed.
                                        I.E. the cache itself was
                                        flushed.
0440 1088 Dbl-Word     8 TCMATTOD       Last time the cache was flushed
                                        for ATTACH XSTORE command.
0448 1096 Signed       4 TCMATRNG (2)   Start and ending XSTORE block
                                        number for last ATTACH XSTORE
                                        flush.
0450 1104 Dbl-Word     8 TCMUDTOD       Last time a range of tracks was
                                        deleted unconditionally.
0458 1112 Signed       4 TCMUDRNG (2)   Starting hash key and number of
                                        hash keys associated with the
                                        last unconditional delete of a
                                        range of tracks.
0460 1120 Signed       4 TCMNEWAS       Informal non-defer, non-spin lock
                                        used when allocating a new MDC
                                        address space. Must hold TCMPTELK
                                        to obtain. If new A/S is needed
                                        and this lock is non-zero, track
                                        insert must be aborted.
0464 1124 Bitstring   12 TCMNEWCO       New address space creation
                                        communication area. Must hold
                                        TCMNEWAS to change or reference
                                        any field here.
0464 1124 Signed       4 TCMNWMDA       MDAS address to use for creating
                                        the new address space.
0468 1128 Signed       4 TCMNWSTO       STO for new address space. Also
                                        address of 1st STE-set.
046C 1132 Signed       4 TCMNWLST       Last STE-set address.
0470 1136 Signed       4 TCMVacated     Number of main storage pages
                                        stolen from cache during memory
                                        reclamation.
0474 1140 Signed       4 *              Reserved for future IBM use.
      End of the TCMBK DSECT
          0000008F       TCMBKSIZ       (*-TCMBK+7)/8 Size in double
                                        words

          
*** TCMBK - Full Track Cache Main Control Block
*
*     +-------------------------------------------------------+
*   0 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +---------------------------+------+------+-------------+
* 100 |         TCMTSLK           |:FLAGS|:FLAG2|  TCMPRIME   |
*     +---------------------------+------+------+-------------+
* 108 |         TCMHMASK          |         TCMIXMSK          |
*     +---------------------------+---------------------------+
* 110 |         TCMRDCT           |          TCMIA            |
*     +---------------------------+---------------------------+
* 118 |         TCMINOTA          |         TCMALMSK          |
*     +---------------------------+---------------------------+
* 120 |         TCMALET1          |         TCMSTO1           |
*     +---------------------------+---------------------------+
* 128 |         TCMALET2          |         TCMSTO2           |
*     +---------------------------+---------------------------+
* 130 |         TCMALET3          |         TCMSTO3           |
*     +---------------------------+---------------------------+
* 138 |         TCMALET4          |         TCMSTO4           |
*     +---------------------------+---------------------------+
* 140 |                                                       |
*     =                       TCMHPPT                         =
*     |                                                       |
*     +-------------+-------------+---------------------------+
* 240 |  TCMBSEGS   |/////////////|         TCMRDAB           |
*     +-------------+-------------+---------------------------+
* 248 |         TCMCOLPG          |         TCMINSCT          |
*     +---------------------------+---------------------------+
* 250 |         TCMDELCT          |         TCMDELST          |
*     +---------------------------+---------------------------+
* 258 |         TCMGCFRM          |         TCMCOLCT          |
*     +---------------------------+---------------------------+
* 260 |         TCMPFCT           |         TCMRDER           |
*     +---------------------------+---------------------------+
* 268 |         TCMSTKRD          |         TCMSTKEX          |
*     +---------------------------+---------------------------+
* 270 |         TCMSTKPF          |         TCMSTKUD          |
*     +---------------------------+---------------------------+
* 278 |         TCMEXCT           |         TCMDCCT           |
*     +---------------------------+---------------------------+
* 280 |         TCMUDFST          |         TCMUDMLT          |
*     +---------------------------+---------------------------+
* 288 |         TCMEFCT           |         TCMCPURG          |
*     +---------------------------+---------------------------+
* 290 |         TCMAVLST          |         TCMAVPAG          |
*     +---------------------------+------+--------------------+
* 298 |         TCMALTBK          |:PTELK|////////////////////|
*     +---------------------------+------+--------------------+
* 2A0 |         TCMSEGTE          |         TCMLASTA          |
*     +---------------------------+---------------------------+
* 2A8 |                       TCMPTE8                         |
*     |                                                       |
*     +-------------+-------------+---------------------------+
* 2B8 |/////////////|/////////////|                           |
*     +-------------+-------------+                           |
*     |                       TCMPTE10                        |
*     |                           +-------------+-------------+
* 2C8 |                           |/////////////|/////////////|
*     +---------------------------+-------------+-------------+
* 2D0 |                       TCMPTE12                        |
*     |                                                       |
*     +-------------+-------------+---------------------------+
* 2E0 |/////////////|/////////////|                           |
*     +-------------+-------------+                           |
*     |                       TCMPTE14                        |
*     |                           +-------------+-------------+
* 2F0 |                           |/////////////|/////////////|
*     +-------------+-------------+-------------+-------------+
* 2F8 |  TCMRDVID   |  TCMMAXID   |                           |
*     +-------------+-------------+                           |
* 300 |                                                       |
*     =                       TCMASNAM                        =
*     |                           +---------------------------+
* 310 |                           |         TCMMNBLW          |
*     +---------------------------+---------------------------+
* 318 |         TCMMNABV          |///////////////////////////|
*     +---------------------------+---------------------------+
* 320 |         TCMMIDSZ          |         TCMMAIN           |
*     +---------------------------+---------------------------+
* 328 |         TCMMNMIN          |         TCMMNMAX          |
*     +---------------------------+---------------------------+
* 330 |         TCMMNDL           |         TCMSTLMN          |
*     +---------------------------+---------------------------+
* 338 |         TCMMCPE           |         TCMSTLFR          |
*     +---------------------------+---------------------------+
* 340 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 348 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 350 |///////////////////////////////////////////////////////|
*     +---------------------------+---------------------------+
* 358 |///////////////////////////|///////////////////////////|
*     +---------------------------+---------------------------+
* 360 |         TCMXIDSZ          |         TCMXSTOR          |
*     +---------------------------+---------------------------+
* 368 |         TCMXSMIN          |         TCMXSMAX          |
*     +---------------------------+---------------------------+
* 370 |         TCMXSTDL          |         TCMSTLXS          |
*     +---------------------------+---------------------------+
* 378 |         TCMXCPE           |///////////////////////////|
*     +---------------------------+---------------------------+
* 380 |         TCMSTXTC          |         TCMSTXHP          |
*     +---------------------------+---------------------------+
* 388 |          TCM2IO           |         TCMKLNT0          |
*     +---------------------------+---------------------------+
* 390 |         TCMDLBAD          |         TCMBADR0          |
*     +---------------------------+---------------------------+
* 398 |         TCMRCBAD          |         TCMBADCC          |
*     +---------------------------+---------------------------+
* 3A0 |         TCMREADS          |         TCMNOPTE          |
*     +-------------+-------------+---------------------------+
* 3A8 |/////////////|  TCMAXSCT   |         TCMNOTEL          |
*     +-------------+-------------+---------------------------+
* 3B0 |         TCMFSHVM          |         TCMFSHIN          |
*     +---------------------------+---------------------------+
* 3B8 |         TCMNFSVM          |         TCMNFSIN          |
*     +---------------------------+---------------------------+
* 3C0 |         TCMFSLIM          |         TCMFSLMM          |
*     +---------------------------+---------------------------+
* 3C8 |         TCMSFSIN          |         TCMSSMIN          |
*     +---------------------------+---------------------------+
* 3D0 |         TCMFSLEX          |         TCMTFBA           |
*     +---------------------------+---------------------------+
* 3D8 |         TCMTCKST          |         TCMTCKNS          |
*     +---------------------------+---------------------------+
* 3E0 |         TCMTECST          |         TCMTECNS          |
*     +---------------------------+---------------------------+
* 3E8 |         TCMPIN4K          |         TCMPOU4K          |
*     +---------------------------+---------------------------+
* 3F0 |         TCMPINVA          |         TCMPSTRD          |
*     +---------------------------+---------------------------+
* 3F8 |         TCMPSTWR          |         TCMPFNS           |
*     +---------------------------+---------------------------+
* 400 |         TCMNOINS          |///////////////////////////|
*     +---------------------------+---------------------------+
* 408 |                       TCMONTOD                        |
*     +-------------------------------------------------------+
* 410 |                       TCMOFTOD                        |
*     +-------------------------------------------------------+
* 418 |                       TCMXSTOD                        |
*     +-------------------------------------------------------+
* 420 |                       TCMXETOD                        |
*     +-------------------------------------------------------+
* 428 |                       TCMQSTOD                        |
*     +-------------------------------------------------------+
* 430 |                       TCMQETOD                        |
*     +-------------------------------------------------------+
* 438 |                       TCMFLTOD                        |
*     +-------------------------------------------------------+
* 440 |                       TCMATTOD                        |
*     +-------------------------------------------------------+
* 448 |                       TCMATRNG                        |
*     +-------------------------------------------------------+
* 450 |                       TCMUDTOD                        |
*     +-------------------------------------------------------+
* 458 |                       TCMUDRNG                        |
*     +---------------------------+---------------------------+
* 460 |         TCMNEWAS          |         TCMNEWCO          |
*     +---------------------------+                           |
*     |                                                       |
*     +---------------------------+---------------------------+
* 470 |        TCMVACATED         |///////////////////////////|
*     +---------------------------+---------------------------+
* 478
*
*** TCMBK - Full Track Cache Main Control Block
          
*** Overlay for TCMASNAM+17 in TCMBK
*
*                                        +------+
* 308 ...                            30D |:ASNUM| 30E
*                                        +------+
*
*** Overlay for TCMASNAM+17 in TCMBK
          
*** Overlay for TCMNEWCO in TCMBK
*
*                                 +---------------------------+
* 460 ...                     464 |         TCMNWMDA          |
*     +---------------------------+---------------------------+
* 468 |         TCMNWSTO          |         TCMNWLST          |
*     +---------------------------+---------------------------+
* 470
*
*** Overlay for TCMNEWCO in TCMBK

 
Symbol         Dspl Value
-------------- ---- -----
TCMALET1       0120
TCMALET2       0128
TCMALET3       0130
TCMALET4       0138
TCMALMSK       011C
TCMALSHF       011C 00000003
TCMALTBK       0298
TCMASNAM       02FC
TCMASNUM       030D
TCMATRNG       0448
TCMATTOD       0440
TCMAVLST       0290
TCMAVPAG       0294
TCMAXSCT       03AA
TCMBADCC       039C
TCMBADR0       0394
TCMBKPTK       030D 00000040
TCMBKSIZ       0474 0000008F
TCMBSEGS       0240
TCMCACHE       0104 80
TCMCOLCT       025C
TCMCOLPG       0248
TCMCPURG       028C
TCMDCCT        027C
TCMDELCT       0250
TCMDELST       0254
TCMDLBAD       0390
TCMDMDC        0104 10
TCMEFAIL       0105 40
TCMEFCT        0288
TCMEOIX        0140 0000023C
TCMEXCT        0278
TCMFBSHF       030D 00000006
TCMFLAGS       0104
TCMFLAG2       0105
TCMFLTOD       0438
TCMFLUSH       0105 20
TCMFRANC       0348
TCMFSHIN       03B4
TCMFSHVM       03B0
TCMFSL         0104 20
TCMFSLEX       03D0
TCMFSLIM       03C0
TCMFSLMM       03C4
TCMGCFRM       0258
TCMGPSHF       0140 0000000A
TCMHMASK       0108
TCMHPPT        0140
TCMHSHEX       0105 80
TCMIA          0114
TCMINISZ       0108 00000004
TCMINOTA       0118
TCMINSCT       024C
TCMIXMSK       010C
TCMIXTST       010C 3F
TCMKLNT0       038C
TCMLASTA       02A4
TCMMAIN        0324
TCMMAXID       02FA
TCMMAXSZ       0108 00000040
TCMMCPE        0338
TCMMDATA       0320
TCMMIDSZ       0320
TCMMNABV       0318
TCMMNBLW       0314
TCMMNDL        0330
TCMMNMAX       032C
TCMMNMIN       0328
TCMMSEME       0105 10
TCMNEWAS       0460
TCMNEWCO       0464
TCMNFSIN       03BC
TCMNFSVM       03B8
TCMNOINS       0400
TCMNOPTE       03A4
TCMNOTEL       03AC
TCMNWLST       046C
TCMNWMDA       0464
TCMNWSTO       0468
TCMOFTOD       0410
TCMONDEF       0104 08
TCMONTOD       0408
TCMPFCT        0260
TCMPFNS        03FC
TCMPGPTK       030D 00000008
TCMPINVA       03F0
TCMPIN4K       03E8
TCMPOU4K       03EC
TCMPRIME       0106
TCMPSHFT       0140 0000000A
TCMPSTRD       03F4
TCMPSTWR       03F8
TCMPTELK       029C
TCMPTES        02A8
TCMPTE10       02BC
TCMPTE12       02D0
TCMPTE14       02E4
TCMPTE8        02A8
TCMQETOD       0430
TCMQSTOD       0428
TCMRCBAD       0398
TCMRDAB        0244
TCMRDCT        0110
TCMRDER        0264
TCMRDVID       02F8
TCMREADS       03A0
TCMSEGTE       02A0
TCMSFSIN       03C8
TCMSSMIN       03CC
TCMSTFRM       0340
TCMSTKEX       026C
TCMSTKPF       0270
TCMSTKRD       0268
TCMSTKUD       0274
TCMSTLFR       033C
TCMSTLM        0104 02
TCMSTLMN       0334
TCMSTLX        0104 04
TCMSTLXS       0374
TCMSTO1        0124
TCMSTO2        012C
TCMSTO3        0134
TCMSTO4        013C
TCMSTXHP       0384
TCMSTXTC       0380
TCMTCHPG       0140 00000400
TCMTCKNS       03DC
TCMTCKST       03D8
TCMTECNS       03E4
TCMTECST       03E0
TCMTFBA        03D4
TCMTHUD        0104 40
TCMTSLK        0100
TCMUDFST       0280
TCMUDMLT       0284
TCMUDRNG       0458
TCMUDTOD       0450
TCMVacated     0470
TCMXCPE        0378
TCMXDATA       0360
TCMXETOD       0420
TCMXIDSZ       0360
TCMXSMAX       036C
TCMXSMIN       0368
TCMXSTDL       0370
TCMXSTOD       0418
TCMXSTOR       0364
TCM2IO         0388