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

TCMBK Prolog | Top of page

     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 Control Block Content | Top of page

     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 Address      4 *              Reserved for IBM use
          TCMSTFRM is used by MDC main storage steal 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      4 *              Addr of next FRMTE to steal ...
    0344  836 Address      4 *              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      4 *              High half
    034C  844 Address      4 *              Anchor for MDC FRMTEs - fwd ptr
    0350  848 Address      4 *              High half
    0354  852 Address      4 *              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.
              0000008E       TCMBKSIZ       (*-TCMBK+7)/8 Size in double
                                            words

TCMBK Storage Layout | Top of page

    *** 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           |///////////////////////////|
    *     +---------------------------+---------------------------+
    * 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
    *
    *** 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

TCMBK Cross Reference | Top of page

    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       046C 0000008E
    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
    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
    TCMXCPE        0378
    TCMXDATA       0360
    TCMXETOD       0420
    TCMXIDSZ       0360
    TCMXSMAX       036C
    TCMXSMIN       0368
    TCMXSTDL       0370
    TCMXSTOD       0418
    TCMXSTOR       0364
    TCM2IO         0388

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:31:13 EDT.
Copyright IBM Corporation, 1990, 2020