FXPBK Back to Index page
 
Prolog 
Control Block Contents 
   FXPBK 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.


  FXPBK Prolog Top of page
  
 NAME       : HCPFXPBK
 DESCRIPTION: Hyperpav paging channel program storage
 DSECT      : FXPBK
 FUNCTION   : The FXPBK contains contains the command or
              transport mode channel program for hyperpav
              paging.
 LOCATED BY : IORCPA - Points to the HXPBK
 CREATED BY : HCPPAIAT - When the CP owned volume is brought on
              line at IPL time and during the ATTACH
              command processing.
 DELETED BY : HCPPAIDT - When the CP owned volume is DETACHed from
              the system.
 SERIALIZED : The same locking as the IORBK.
 RELOCATION CONSIDERATIONS : None
 NOTES      : FXPBKS ARE ALIGNED 4096 BYTE (FULL PAGE) BLOCKS
              DEBUG fields are provided as debugging aids only and
              are not used for hyperpav paging support.
              We try to maintain the naming convention where
              FXPTxxxx is related to Transport Mode
              FXPCxxxx is related to Command Mode
              anything else could be related to both
  ictures -
              For Transport Mode I/O
              0 +*********************************************--+
              |                                               |
              |  FXPTCW                                       |
              |                                               |
              +*********************************************--+
              |                                               |
              |  FXPTCCB                                      |
              |    contains TCCBK                             |
              |    which includes CDPFX at TCADCWDA           |
              |    CDPFX includes DXDA Define Extent Data     |
              |    CDPFX includes LRDA Locate Record Data     |
              |                                               |
              +*********************************************--+
              |                                               |
              |  TIDAWs                                       |
              |                                               |
              +*********************************************--+
              |                                               |
              |  TCAX                                         |
              |                                               |
              +*********************************************--+
              |                                               |
              |  FXPctls                                      |
              |                                               |
              4K +*********************************************--+
              For Command Mode I/O
              0 +*********************************************--+
              |                                               |
              |  FXPCcws                                      |
              |   |                                           |
              |   | usage grows toward 4K                     |
              |   *                                           |
              |                                               |
              +*********************************************--+
              |                                               |
              |   *                                           |
              |   | usage grows toward 0                      |
              |   |                                           |
              |  IDAWs and Locate Record data                 |
              |                                               |
              +*********************************************--+
              |                                               |
              |  CDPFX area                                   |
              |                                               |
              +*********************************************--+
              |                                               |
              |  FXPctls                                      |
              |                                               |
              4K +*********************************************--+
 
 
  FXPBK Control Block Content Top of page
  




 FXPBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FXPBK          Hyperpav paging channel program storage
0000    0 Bitstring    1 * (4096)       FXPBK is 4K and 4K aligned
1000 4096 Character    1 FXPEND (0)     End of the FXPBK
          00001000       FXPBYSZ        *-FXPBK Size in bytes
          00000200       FXPDWSZ        (((*-FXPBK)+7)/8) Size in
                                        doublewords
          00000400       FXPTCAXb       1024 Byte length of TCAX area as
                                        dictated by DS8000
      Control fields - If expansion is needed, add a quadword.
                      Quadword is the size of a TIDAW.
          00000F90       FXPctls        * Label for calculating the
                                        length of this control area
      The next four fields are the frame count for error handling
      when a format error occurs and the DCW offset in the TSB is
      is not zero.
0F90 3984 Signed       2 FXPERCT1       Frame count for 1st TCAX DCW
0F92 3986 Signed       2 FXPERCT2       Frame count for 2nd TCAX DCW
0F94 3988 Signed       2 FXPERCT3       Frame count for 3rd TCAX DCW
0F96 3990 Signed       2 FXPERCT4       Frame count for 4th TCAX DCW
0F98 3992 Dbl-Word     8 FXPIO          I/O start TOD
0FA0 4000 Signed       4 FXPFRMCT       NUMBER OF FRAMES IN CP
0FA4 4004 Signed       4 FXPTIDCT       Remaining TIDAWs
0FA8 4008 Address      8 FXPTIDAW       Current TIDAW address
          FXPTIDAW       FXPCidaw       FXPTIDAW FXPCidaw Latest IDAW
                                        address
0FB0 4016 Address      8 FXPLRE         HAA current LRE or imb LR
0FB8 4024 Address      8 FXPTCAT        HAA last TCAT location
0FC0 4032 Address      8 FXPTILR        Current Imbedded LR address
          0FXPTILR       FXPCCLR        FXPTILR FXPCCLR HAA Command Mode
                                        latest LR
0FC8 4040 Dbl-Word     8 FXPRECRD       Last DASD record number
0FD0 4048 Signed       4 FXPblk# (0)    FBA last block number
0FD0 4048 Bitstring    1 FXPH           Four bit head
0FD1 4049 Bitstring    1 *              Part of FXPblk#
0FD2 4050 Signed       2 *              Part of FXPblk#
0FD4 4052 Address      4 FXPTCWLA       HLA TCW
          FXPTCWLA       FXPCccw        FXPTCWLA FXPCccw HAA Command Mode
                                        latest CCW
0FD8 4056 Address      8 FXPFRMTE       First FRMTE/SVGBK on queue
0FE0 4064 Address      8 FXPFRMTL       Last FRMTE/SVGBK on queue
0FE8 4072 Signed       4 FXPECYL        Current 0CCCcccc
0FEC 4076 Bitstring    1 FXPFLAG        Flag byte
          1... ....      FXPADCBC       X'80' FXPADCBC Add CBC to TIDAW
                                        before adding new last TIDAW
          .1.. ....      FXPADPAD       X'40' FXPADPAD Add four byte pad
                                        to TCAX TIDAW on next LRE
          ..1. ....      FXPRMPAD       X'20' FXPRMPAD Remove four byte
                                        pad from TCAX TIDAW on next LRE
                                        These are used by HCPPAIIN to
                                        restore IORDFLG3 bits.
          ...1 ....      FXPHPPRD       X'10' FXPHPPRD Read channel
                                        program
          .... 1...      FXPHPPWR       X'08' FXPHPPWR Write channel
                                        program
          .... .1..      FXPHPPSV       X'04' FXPHPPSV Input block is
                                        SVGBK
0FED 4077 Bitstring    1 *              Reserved
0FEE 4078 Bitstring    1 FXPTYPE        Type of channel program
          1... ....      FXPFBA         X'80' FXPFBA FBA
          .1.. ....      FXPECKDC       X'40' FXPECKDC ECKD command mode
          ..1. ....      FXPECKDT       X'20' FXPECKDT ECKD transport
                                        mode
0FEF 4079 Signed       1 FXPLRcnt       LocRec count
0FF0 4080 Address      4 FXPRDEV        DEBUG: RDEV address
0FF4 4084 Address      4 FXPHXPBK       DEBUG: HXPBK address
0FF8 4088 Address      4 FXPIORBK       DEBUG: IORBK address
0FFC 4092 Bitstring    1 FXPLRSTA       Locate Record state byte
          .... ....      FXPTCCBE       0 FXPTCCBE TCCB PREFIX LRE in use
          .... ...1      FXPTCCBI       1 FXPTCCBI TCCB imbedded LR in
                                        use
          .... ..1.      FXPTCAXE       2 FXPTCAXE TCAX LRE in use
          .... ..11      FXPTCAXI       3 FXPTCAXI TCAX imbedded LR used
0FFD 4093 Character    3 FXPEYE         Eye catcher 'FXP'
          00000070       FXPctlLn       *-FXPctls If we've miscalculated,
                                        this EQU will show what we need
                                        to subtract in the ORG above
      Define more FXPBK contents
0000    0 Dbl-Word     8 FXPTCW (8)     Transport Command Word
0040   64 Dbl-Word     8 FXPTCCB (34)   Host TCCB (max length) DWord
                                        boundary
          00000150       FXPTCCBX       * Byte past FXPTCCB
      CKMAINT that we are on a quadword boundary in order to
      check that we haven't skipped bytes and not accounted
      for them properly.
      Enforce a quadword boundary for TIDAWs
0150  336 Dbl-Word     8 FXPTCAXT (2)   Reserved for TCAX TIDAW
0160  352 Character    1 FXPQW (0)      Quad word boundary label
      Last two letters of FXPTID fields: FCXTIDxy
      x=S for size,
      x=A for start of TIDAW list (TIDAL)
      x=M for max frames
      x=E for offset after last TIDAW
      y=N for no TCAX
      y=T for TCAX
      xy=DE for delta between NO TCAX and TCAX
          00000E30       FXPTIDSN       FXPBYSZ-(FXPQW-FXPBK)-FXPctlLn
                                        TIDAL size - NO TCAX
0160  352 Character    1 FXPTIDAN (3632)
                                        TIDAWS - NO TCAX
          000000E3       FXPTIDMN       (FXPTIDEN-FXPTIDAN)/16 Max frames
                                        - NO TCAX
          00000A30       FXPTIDST       FXPBYSZ-(FXPQW-FXPBK)-FXPTCAXb-FX
                                        PctlLn TIDAL size - TCAX
0160  352 Character    1 FXPTIDAT (2608)
                                        TIDAWS - TCAX
0B90 2960 Character    1 FXPTIDET (0)   After last TIDAW - TCAX
          000000A3       FXPTIDMT       (FXPTIDET-FXPTIDAT)/16 Max frames
                                        - TCAX
          00000040       FXPTIDDE       (FXPTIDMN-FXPTIDMT) Delta - TCAX
                                        and no TCAX
      TCAX is at the end of the block to allow a dynamic decision
      about including it in the channel program. If the imbedded
      locate records in the TCCB are reached with adequate TIDAWs
      remaining, the TCAX can be used. The remaining frame count
      in the HCPPAIIN loop is decremented by FXPTIDDE.
0B90 2960 Bitstring    1 FXPTCAX (1024) MAXIMUM TCAX LENGTH DS8000
0F90 3984 Character    1 FXPTIDEN (0)   After last TIDAW - NO TCAX This
                                        should bring us up to FXPctls at
                                        the end of the 4K.
                    Redefine FXPBK for Command Mode
0000    0 Dbl-Word     8 FXPCccws (0)   First CCW in chain
          00000F50       FXPCdat        * After IDAWs and LR data; must
                                        be quad-word aligned
0F50 3920 Bitstring   64 FXPCdpfx       Basic Prefix data area FXPctls
                                        fields actually reside from here
                                        to end of the page
 
 
  FXPBK Storage Layout Top of page
  
          
*** FXPBK - Hyperpav paging channel program storage
*
*     +-------------------------------------------------------+
*   0 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*
*** FXPBK - Hyperpav paging channel program storage
          
*** Overlay for FXPEND-x'70' in FXPBK
*
*     +-------------+-------------+-------------+-------------+
* F90 |  FXPERCT1   |  FXPERCT2   |  FXPERCT3   |  FXPERCT4   |
*     +-------------+-------------+-------------+-------------+
* F98 |                        FXPIO                          |
*     +---------------------------+---------------------------+
* FA0 |         FXPFRMCT          |         FXPTIDCT          |
*     +---------------------------+---------------------------+
* FA8 |                       FXPTIDAW                        |
*     +-------------------------------------------------------+
* FB0 |                        FXPLRE                         |
*     +-------------------------------------------------------+
* FB8 |                       FXPTCAT                         |
*     +-------------------------------------------------------+
* FC0 |                       FXPTILR                         |
*     +-------------------------------------------------------+
* FC8 |                       FXPRECRD                        |
*     +------+------+-------------+---------------------------+
* FD0 |FXPH  |//////|/////////////|         FXPTCWLA          |
*     +------+------+-------------+---------------------------+
* FD8 |                       FXPFRMTE                        |
*     +-------------------------------------------------------+
* FE0 |                       FXPFRMTL                        |
*     +---------------------------+------+------+------+------+
* FE8 |         FXPECYL           |:FLAG |//////|:TYPE |:LRCNT|
*     +---------------------------+------+------+------+------+
* FF0 |         FXPRDEV           |         FXPHXPBK          |
*     +---------------------------+------+--------------------+
* FF8 |         FXPIORBK          |:LRSTA|      FXPEYE        |
*     +---------------------------+------+--------------------+
*1000
*
*** Overlay for FXPEND-x'70' in FXPBK
          
*** Overlay for FXPBK in FXPBK
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                        FXPTCW                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  40 |                                                       |
*     =                       FXPTCCB                         =
*     |                                                       |
*     +-------------------------------------------------------+
* 150
*
*** Overlay for FXPBK in FXPBK
          
*** Overlay for FXPBK+0+16*((*-FXPBK+16-0-1)/16) in FXPBK
*
*     +-------------------------------------------------------+
* 150 |                       FXPTCAXT                        |
*     |                                                       |
*     +-------------------------------------------------------+
*
*** Overlay for FXPBK+0+16*((*-FXPBK+16-0-1)/16) in FXPBK
          
*** Overlay for FXPQW in FXPBK
*
*     +-------------------------------------------------------+
* 160 |                                                       |
*     =                       FXPTIDAN                        =
*     |                                                       |
*     +-------------------------------------------------------+
* F90
*
*** Overlay for FXPQW in FXPBK
          
*** Overlay for FXPQW in FXPBK
*
*     +-------------------------------------------------------+
* 160 |                                                       |
*     =                       FXPTIDAT                        =
*     |                                                       |
*     +-------------------------------------------------------+
* B90 |                                                       |
*     =                       FXPTCAX                         =
*     |                                                       |
*     +-------------------------------------------------------+
*
*** Overlay for FXPQW in FXPBK
          
*** Overlay for FXPBK in FXPBK
*
*
*** Overlay for FXPBK in FXPBK
          
*** Overlay for FXPctls-64 in FXPBK
*
*     +-------------------------------------------------------+
* F50 |                                                       |
*     =                       FXPCDPFX                        =
*     |                                                       |
*     +-------------------------------------------------------+
* F90
*
*** Overlay for FXPctls-64 in FXPBK
 
 
  FXPBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
FXPblk#        0FD0
FXPctls        1000 00000F90
FXPctlLn       0FFD 00000070
FXPADCBC       0FEC 80
FXPADPAD       0FEC 40
FXPBYSZ        1000 00001000
FXPCccw        0FD4 FXPTCWLA
FXPCccws       0000
FXPCdat        0000 00000F50
FXPCdpfx       0F50
FXPCidaw       0FA8 FXPTIDAW
FXPCCLR        0FC0 0FXPTILR
FXPDWSZ        1000 00000200
FXPECKDC       0FEE 40
FXPECKDT       0FEE 20
FXPECYL        0FE8
FXPEND         1000
FXPERCT1       0F90
FXPERCT2       0F92
FXPERCT3       0F94
FXPERCT4       0F96
FXPEYE         0FFD
FXPFBA         0FEE 80
FXPFLAG        0FEC
FXPFRMCT       0FA0
FXPFRMTE       0FD8
FXPFRMTL       0FE0
FXPH           0FD0
FXPHPPRD       0FEC 10
FXPHPPSV       0FEC 04
FXPHPPWR       0FEC 08
FXPHXPBK       0FF4
FXPIO          0F98
FXPIORBK       0FF8
FXPLRcnt       0FEF
FXPLRE         0FB0
FXPLRSTA       0FFC
FXPQW          0160
FXPRDEV        0FF0
FXPRECRD       0FC8
FXPRMPAD       0FEC 20
FXPTCAT        0FB8
FXPTCAX        0B90
FXPTCAXb       1000 00000400
FXPTCAXE       0FFC 02
FXPTCAXI       0FFC 03
FXPTCAXT       0150
FXPTCCB        0040
FXPTCCBE       0FFC 00
FXPTCCBI       0FFC 01
FXPTCCBX       0040 00000150
FXPTCW         0000
FXPTCWLA       0FD4
FXPTIDAN       0160
FXPTIDAT       0160
FXPTIDAW       0FA8
FXPTIDCT       0FA4
FXPTIDDE       0B90 00000040
FXPTIDEN       0F90
FXPTIDET       0B90
FXPTIDMN       0160 000000E3
FXPTIDMT       0B90 000000A3
FXPTIDSN       0160 00000E30
FXPTIDST       0160 00000A30
FXPTILR        0FC0
FXPTYPE        0FEE
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:28:22 EDT.
Copyright IBM Corporation, 1990, 2020