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