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