FCTBK Back to Index page
 
Prolog 
Control Block Contents 
   FCTBK 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.


  FCTBK Prolog Top of page
  
 NAME       : HCPFCTBK
 DESCRIPTION: Fast CCW Translation BlocK
 DSECT      : FCTBK
 FUNCTION   : This block contains room to hold translated
              guest CCWs and control information.
 LOCATED BY : IORCPA.
 CREATED BY : HCPFTRAN.
 DELETED BY : HCPFTRAN, HCPFUNTR, HCPFUNFR
 RELOCATION CONSIDERATIONS : None
 NOTES      : FCTBKs are obtained by HCPFGST
              FCTBKs are released by HCPFRST
 
 
  FCTBK Control Block Content Top of page
  




 FCTBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FCTBK          Fast CCW Translation BlocK
0000    0 Dbl-Word     8 FCTWORKA (40)  Room for CCWS and Parms
          00000120       FCTFREES       ((*-FCTBK)-16-16) Save room for 2
                                        CCWs and TIC block when
                                        allocating free storage.
       Fixed trailer fields for (E)CKD and FBA.
0140  320 Bitstring    1 FCTTRLR (0)    Fixed information
       FBA Only trailer fields -
0140  320 Signed       4 FCTSEXT        Starting Record
0144  324 Signed       4 FCTLOCF        First host block # from most
                                        recent LOCATE
0148  328 Signed       4 FCTLOCL        Last host block # from most
                                        recent LOCATE
       (E)CKD Only trailer fields -
0140  320 Signed       4 FCTEOTR        End of track
0144  324 Signed       4 *              Reserved
0148  328 Signed       4 *              Reserved
       Common (E)CKD and FBA trailer fields -
014C  332 Signed       4 FCTEOGCP       End of guest channel program
0150  336 Signed       4 FCTEHLCP       Host Logical end of the channel
                                        program
0154  340 Address      4 FCTGCPA        Start of guest CCWs
0158  344 Bitstring    1 FCT_2 (0)      Area that must be cleared
0158  344 Signed       4 FCTFLB64       Queue of 64 bit TLBs
015C  348 Signed       4 FCTTCHBK       Address of TCHBK
0160  352 Signed       4 FCTLAST        Last FCTBK queued or addr of this
                                        FCTBK if no additional FCTBKs
                                        queued
0164  356 Address      4 FCTTICAN       TIC anchor
0168  360 Signed       4 FCTUTRAN       Untrans Entry anchor
      The next 3 words are ORGed by MDC fields.  Only use these
      fields after calls to MDC.
016C  364 Signed       4 FCTEOHCP       Host Absolute end of channel
                                        program
0170  368 Signed       4 *              Only use this on pass 2
0174  372 Signed       4 *              Only use this on pass 2
       Redefinition of LOCF as used by HCPFTR
0144  324 Signed       4 FCTBLKAP       Blocks per "cylinder"
       Redefinition of TLB area for Full Track Caching
016C  364 Signed       2 FCTBKSZ (0)    ECKD block size
016C  364 Signed       2 FCTRDSZ        Size of read
016E  366 Signed       2 FCTHH          Head of seek arg
0170  368 Signed       2 FCTTCKEY (0)   MDC device ID
      FCTNCE is used to turn on the high order byte of FCTTCKEY.
      When FCTTCKEY is negative or zero, caching is bypassed.
0170  368 Bitstring    1 FCTMDCFL       1st byte of FCTTCKEY
          1... ....      FCTNCE         X'80' FCTNCE Not eligible for MDC
0171  369 Bitstring    1 *              2nd byte of FCTTCKEY
0172  370 Signed       2 FCTTPCYL       Tracks per cylinder
0174  372 Signed       2 FCTDL          Current record's length
          000FCTDL       FCTMDRSZ       X'DFEE' FCTMDRSZ Max dasd record
                                        size that MDC will accept. This
                                        is the max value for 3390's -
                                        57326 bytes of usable track
                                        capacity
0176  374 Signed       2 FCTRESID       Residual count
0178  376 Bitstring    1 FCTFLAG
          1... ....      FCTFMT1        X'80' FCTFMT1 Using format 1 CCWs
          1... ....      FCTPCI         X'80' FCTPCI Redefined for FTS:
                                        PCI encountered in CP
          .1.. ....      FCTOVRFL       X'40' FCTOVRFL We have overflowed
          ..1. ....      FCTNOSEK       X'20' FCTNOSEK No seeks allowed
          ...1 ....      FCTSEEKD       X'10' FCTSEEKD Seek or locate
                                        done
          .... 1...      FCTWRITE       X'08' FCTWRITE CP has a write CCW
          .... .1..      FCTREAD        X'04' FCTREAD CP has a "read" CCW
          .... .1..      FCTBADLN       X'04' FCTBADLN Redefined for FTS:
                                        Bad length on last CCW
          .... ..1.      FCTMULTI       X'02' FCTMULTI Multitrack CCW
          .... ...1      FCTMSEEK       X'01' FCTMSEEK Multiple seeks
0179  377 Bitstring    1 FCTSTYPE       Guest storage mode and
                                        miscellaneous bits
          .1.. ....      FCTPASS2       X'40' FCTPASS2 HCPFTR is in PASS
                                        2
          ..1. ....      FCTSPLIT       X'20' FCTSPLIT Used by FUN when
                                        it gets split status to avoid
                                        puging MDC if ok
          ...1 ....      FCTF2IDA       X'10' FCTF2IDA Guest using Fmt-2
                                        IDAWs
          .... 1...      FCT2KIDA       X'08' FCT2KIDA Guest/Host IDAWs
                                        will be 2K boundary. The guest
                                        could be using format-1 or
                                        format-2/2K. In both cases CP
                                        will trans to format-2/2K. If the
                                        bit is off it means the guest is
                                        using fmt-2/4K IDAWs and so will
                                        CP.
          .... ...1      FCTMIDA        X'01' FCTMIDA Current CCW using
                                        MIDAWs
017A  378 Bitstring    2 *              IBM RESERVED
017C  380 Signed       4 FCTVCCCH       Virtual ccccCCCh address
0180  384 Signed       4 FCTNEXT        Address of next FCTBK
0184  388 Bitstring    1 FCTFLAG2       Second flag byte
          1... ....      FCTFBA         X'80' FCTFBA This is an FBA
                                        program
          .1.. ....      FCTDX          X'40' FCTDX DX or SFM has been
                                        done
          ..1. ....      FCTR0          X'20' FCTR0 Oriented to Record
                                        zero
          ...1 ....      FCTDED         X'10' FCTDED Dedicated device
          .... 1...      FCTDIDIO       X'08' FCTDIDIO I/O was done
                                        during MDC simulation
          .... .1..      FCTDCHN        X'04' FCTDCHN This CCW is data
                                        chained
          .... ..1.      FCTCKDCN       X'02' FCTCKDCN CKD conversion
                                        mode
          .... ...1      FCTREGDF       X'01' FCTREGDF Regular data
                                        format mode
0185  389 Bitstring    1 FCTFLAG3       Third flag byte
          1... ....      FCTPREFX       X'80' FCTPREFX Prefix CCW is
                                        present
          .1.. ....      FCTCANTS       X'40' FCTCANTS A CCW that can be
                                        timestamped is present in the
                                        channel program
          ..1. ....      FCTNOPRE       X'20' FCTNOPRE No required Prefix
                                        CCW
0186  390 Bitstring    2 *              IBM RESERVED
0188  392 Signed       4 FCTHOST_CYL32  Host cylinder 0CCCcccc
          ST_CYL32       FCTCLEAR       00034 FCT_2,*-FCT_2 Area to clear
018C  396 Signed       4 FCTCCCH1       CCCH work area
0190  400 Signed       4 FCTCCCH2       CCCH work area
0194  404 Signed       4 FCTFLEYE (0)   Word to include reserved byte
                                        plus eyecatcher
0194  404 Bitstring    1 *              IBM RESERVED
0195  405 Character    3 FCTEYE         Eye catcher 'FCT'
          00000198       FCTEND         *
          00000198       FCTBSIZE       *-FCTBK Size in bytes
          00000033       FCTBKDWS       (((*-FCTBK)+7)/8) Size in
                                        doublewords
          00000031       FCTBKFSZ       FCTBKDWS-2 Size minus trailer
 
 
  FCTBK Storage Layout Top of page
  
          
*** FCTBK - Fast CCW Translation BlocK
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       FCTWORKA                        =
*     |                                                       |
*     +---------------------------+---------------------------+
* 140 |         FCTSEXT           |         FCTLOCF           |
*     +---------------------------+---------------------------+
* 148 |         FCTLOCL           | 14C
*     +---------------------------+
*
*** FCTBK - Fast CCW Translation BlocK
          
*** Overlay for FCTTRLR in FCTBK
*
*     +---------------------------+---------------------------+
* 140 |         FCTEOTR           |///////////////////////////|
*     +---------------------------+---------------------------+
* 148 |///////////////////////////|         FCTEOGCP          |
*     +---------------------------+---------------------------+
* 150 |         FCTEHLCP          |         FCTGCPA           |
*     +---------------------------+---------------------------+
* 158 |         FCTFLB64          |         FCTTCHBK          |
*     +---------------------------+---------------------------+
* 160 |         FCTLAST           |         FCTTICAN          |
*     +---------------------------+---------------------------+
* 168 |         FCTUTRAN          |         FCTEOHCP          |
*     +---------------------------+---------------------------+
* 170 |///////////////////////////|///////////////////////////|
*     +---------------------------+---------------------------+
* 178
*
*** Overlay for FCTTRLR in FCTBK
          
*** Overlay for FCTLOCF in FCTBK
*
*                                 +---------------------------+
* 140 ...                     144 |         FCTBLKAP          |
*                                 +---------------------------+
* 148
*
*** Overlay for FCTLOCF in FCTBK
          
*** Overlay for FCTEOHCP in FCTBK
*
*                                 +-------------+-------------+
* 168 ...                     16C |  FCTRDSZ    |   FCTHH     |
*     +------+------+-------------+-------------+-------------+
* 170 |:MDCFL|//////|  FCTTPCYL   |   FCTDL     |  FCTRESID   |
*     +------+------+-------------+-------------+-------------+
* 178 |:FLAG |:STYPE|/////////////|         FCTVCCCH          |
*     +------+------+-------------+------+------+-------------+
* 180 |         FCTNEXT           |:FLAG2|:FLAG3|/////////////|
*     +---------------------------+------+------+-------------+
* 188 |      FCTHOST_CYL32        |         FCTCCCH1          |
*     +---------------------------+------+--------------------+
* 190 |         FCTCCCH2          |//////|      FCTEYE        |
*     +---------------------------+------+--------------------+
* 198
*
*** Overlay for FCTEOHCP in FCTBK
 
 
  FCTBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
FCT_2          0158
FCTBADLN       0178 04
FCTBKDWS       0195 00000033
FCTBKFSZ       0195 00000031
FCTBKSZ        016C
FCTBLKAP       0144
FCTBSIZE       0195 00000198
FCTCANTS       0185 40
FCTCCCH1       018C
FCTCCCH2       0190
FCTCKDCN       0184 02
FCTCLEAR       0188 ST_CYL32
FCTDCHN        0184 04
FCTDED         0184 10
FCTDIDIO       0184 08
FCTDL          0174
FCTDX          0184 40
FCTEHLCP       0150
FCTEND         0195 00000198
FCTEOGCP       014C
FCTEOHCP       016C
FCTEOTR        0140
FCTEYE         0195
FCTFBA         0184 80
FCTFLAG        0178
FCTFLAG2       0184
FCTFLAG3       0185
FCTFLB64       0158
FCTFLEYE       0194
FCTFMT1        0178 80
FCTFREES       0000 00000120
FCTF2IDA       0179 10
FCTGCPA        0154
FCTHH          016E
FCTHOST_CYL32  0188
FCTLAST        0160
FCTLOCF        0144
FCTLOCL        0148
FCTMDCFL       0170
FCTMDRSZ       0174 000FCTDL
FCTMIDA        0179 01
FCTMSEEK       0178 01
FCTMULTI       0178 02
FCTNCE         0170 80
FCTNEXT        0180
FCTNOPRE       0185 20
FCTNOSEK       0178 20
FCTOVRFL       0178 40
FCTPASS2       0179 40
FCTPCI         0178 80
FCTPREFX       0185 80
FCTRDSZ        016C
FCTREAD        0178 04
FCTREGDF       0184 01
FCTRESID       0176
FCTR0          0184 20
FCTSEEKD       0178 10
FCTSEXT        0140
FCTSPLIT       0179 20
FCTSTYPE       0179
FCTTCHBK       015C
FCTTCKEY       0170
FCTTICAN       0164
FCTTPCYL       0172
FCTTRLR        0140
FCTUTRAN       0168
FCTVCCCH       017C
FCTWORKA       0000
FCTWRITE       0178 08
FCT2KIDA       0179 08
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:50:27 EDT.
Copyright IBM Corporation, 1990, 2022