Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
CHPBK
Control Block Contents
CHPBK DSECT
Cross Reference (Contains links to field and bit definitions)
CHPBK Prolog
NAME : HCPCHPBK DESCRIPTION: SPXTAPE Channel Program Block COPYRIGHT - THIS MODULE IS "RESTRICTED MATERIALS OF IBM" 5654-030 (C) COPYRIGHT IBM CORP. - 1994, 1998 LICENSED MATERIALS - PROPERTY OF IBM DSECT : CHPBK FUNCTION : Work area to hold a channel program and the resources needed (including an IORBK) to issue an SPXTAPE tape I/O request and handle the completion or recovery procedures. LOCATED BY : Routines: HCPSPYWT - to set up the I/O operation HCPSPYWI - interrupt processing HCPSPZRT - to set up the I/O operation HCPSPZRI - interrupt processing Control block fields: TAPCHPQ - head of queue in the TAPBK CHPNEXT - next in circular queue CREATED BY : HCPSPYWT - SPXTAPE DUMP commands HCPSPZRT - SPXTAPE LOAD and SCAN commands DELETED BY : HCPSPYWT - SPXTAPE DUMP commands HCPSPZRT - SPXTAPE LOAD and SCAN commands References : HCPCHPBK requires HCPIORBK COPY
CHPBK Control Block Content
CHPBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure CHPBK SPXTAPE Channel Program Block Reserve space for the base IORBK 0000 0 Dbl-Word 8 CHPIORBK (45) Base IORBK region Lock for this IORBK and CHPBK work area 0168 360 Dbl-Word 8 CHPLOCK (3) Lock to serialize this block Commit and recovery control data. Last items in the current block used to update commit cursors when successfully sent to tape. 0180 384 Signed 2 CHPCMCLR (0) Beginning of area to be cleared before reuse for trailer 0180 384 Address 4 CHPCURTK Last ticket contained in current block 0184 388 Address 4 CHPCMSSQ Last SSQBK 0188 392 Address 4 CHPCMCUR Address of next Vpage slot in last SSQBK 018C 396 Signed 4 CHPCURHD Displacement in header of cur hdr 0190 400 Signed 4 CHPCMXAB Amt of XAB data associated with last tkt remaining to be written 0194 404 Address 4 CHPLSTCW CCW address of the last piece of data for files that completed in the current block. If = 0 then block contains no complete files 0198 408 Signed 4 CHPLLPTR Last offset in page list +1 used 019C 412 Address 4 CHPLSTHD Hdr addr for last completed file 01A0 416 Signed 4 CHPLBLKZ Save last block size at last complete file/tkt in this block. Counters, etc. 01A4 420 Character 16 CHPTKTS Queue of files completed in this channel program. Moved to TAPTKTQ when I/O completes OK. Single-threaded double-headed FIFO queue terminated by zero 01A4 420 Address 4 CHPTKTSH Head of CHPTKTS 01A8 424 Address 4 CHPTKTST Tail of CHPTKTS 01AC 428 Signed 4 CHPTKTCT Corresponding count of files on CHPTKTS 01B0 432 Signed 4 * Reserved 01B4 436 Signed 4 CHPENTRY Current entry in the header 01B8 440 Signed 4 CHPLIMIT After the last entry in the hdr 01BC 444 Signed 4 CHPLINDX Index into CCW list of buffers 01C0 448 Signed 4 CHPOFFST Offset into block where data should be added 01C4 452 Signed 4 * 01C8 456 Signed 4 CHPPOOLC Count of pool pages (data pages) 01CC 460 Address 4 CHPPLIST (14) List of pages locked for this blk 00000038 CHPPLLEN *-CHPPLIST Length to clear 0000000E CHPPLMAX 14 Maximum number of entries 0204 516 Signed 4 * End flag for PLIST - zero = end 00000088 CHPCMCRL *-CHPCMCLR Length of area to be cleared before reuse for trailer Queue of CHPbks link field 0208 520 Address 4 CHPNEXT Next work area in circular queue Save area across GOTO I/O request 020C 524 Signed 4 CHPSAVE (7) Save R3-R9 across call to IOS.QS Channel Program and Header Block copied from TAPBK 0228 552 Dbl-Word 8 CHPPGM (26) Modeset + hdr + 3*8 (desc + xab + data) 02F8 760 Dbl-Word 8 CHPHEADR (37) Block header End of CHPBK definition 0420 1056 Dbl-Word 8 CHPRESVD (12) Round it off 00000318 CHPLENBY *-CHPLOCK Extra space (after IORBK) 00000480 CHPIOBY *-CHPBK Whole work area size in bytes 00000090 CHPIODW CHPIOBY/8 Same in double words 00000002 CHPBKCNT 2 Number of work areas per drive Redefinition for the channel program build area 0228 552 Dbl-Word 8 CHPMSCCW Modeset, if applicable 0230 560 Address 4 CHPHDCCW Read/write header CCW 0234 564 Address 4 CHPHCCWA Address of the CHPHEADR 0238 568 Address 4 CHPCCW1 First general CCW 023C 572 Address 4 CHPCCW1A Address section for deblocking 0240 576 Dbl-Word 8 CHPCCWS (20) File write CCWs - desc, XAB, data Or read CCW's - up to 8 pages 000000B8 CHPPGMLN *-CHPPGM Must match size defined above Redefinition for the tape block header section 02F8 760 Character 4 CHPBLKID Generally 'XHDR', could be 'TRLR' 02FC 764 Signed 4 CHPBLKSZ Size of this block in bytes 0300 768 Dbl-Word 8 CHPTIME Time stamp Definition of an individual entry 0308 776 Dbl-Word 8 CHPHDENT (0) Start of the first entry 0308 776 Character 8 CHPOWNER File owner 0310 784 Signed 4 CHPFSEQ File sequence number for drive 0314 788 Signed 4 CHPSYSID System spool file ID when dumped 0318 792 Signed 2 CHPSPID User spool file ID when dumped 031A 794 Bitstring 1 CHPHDFLG Flags describing file section 031B 795 Bitstring 1 * 031C 796 Signed 4 CHPMAPCT Count of map pages needed for file 0320 800 Signed 4 CHPPAGNO Starting relative page number 0324 804 Signed 2 CHPPAGCT Count of data pages in block 0326 806 Signed 2 CHPXABSZ Size of XAB section in block 0328 808 Signed 2 CHPTKOFF Offset to ticket - file descriptor 032A 810 Signed 2 CHPXAOFF Offset to extended attributes buf 032C 812 Signed 2 CHPDPOFF Offset to data pages 032E 814 Signed 2 *
CHPBK Storage Layout
*** CHPBK - SPXTAPE Channel Program Block * * +-------------------------------------------------------+ * 0 | | * = CHPIORBK = * | | * +-------------------------------------------------------+ * 168 | | * = CHPLOCK = * | | * +---------------------------+---------------------------+ * 180 | CHPCURTK | CHPCMSSQ | * +---------------------------+---------------------------+ * 188 | CHPCMCUR | CHPCURHD | * +---------------------------+---------------------------+ * 190 | CHPCMXAB | CHPLSTCW | * +---------------------------+---------------------------+ * 198 | CHPLLPTR | CHPLSTHD | * +---------------------------+---------------------------+ * 1A0 | CHPLBLKZ | | * +---------------------------+ | * | CHPTKTS | * | +---------------------------+ * | | 1B4 * +---------------------------+ * *** CHPBK - SPXTAPE Channel Program Block *** Overlay for CHPTKTS in CHPBK * * +---------------------------+ * 1A0 ... 1A4 | CHPTKTSH | * +---------------------------+---------------------------+ * 1A8 | CHPTKTST | CHPTKTCT | * +---------------------------+---------------------------+ * 1B0 |///////////////////////////| CHPENTRY | * +---------------------------+---------------------------+ * 1B8 | CHPLIMIT | CHPLINDX | * +---------------------------+---------------------------+ * 1C0 | CHPOFFST |///////////////////////////| * +---------------------------+---------------------------+ * 1C8 | CHPPOOLC | | * +---------------------------+ | * 1D0 | | * = CHPPLIST = * | +---------------------------+ * 200 | |///////////////////////////| * +---------------------------+---------------------------+ * 208 | CHPNEXT | | * +---------------------------+ | * 210 | | * = CHPSAVE = * | | * +-------------------------------------------------------+ * 228 | | * = CHPPGM = * | | * +-------------------------------------------------------+ * 2F8 | | * = CHPHEADR = * | | * +-------------------------------------------------------+ * 420 | | * = CHPRESVD = * | | * +-------------------------------------------------------+ * 480 * *** Overlay for CHPTKTS in CHPBK *** Overlay for CHPPGM in CHPBK * * +-------------------------------------------------------+ * 228 | CHPMSCCW | * +---------------------------+---------------------------+ * 230 | CHPHDCCW | CHPHCCWA | * +---------------------------+---------------------------+ * 238 | CHPCCW1 | CHPCCW1A | * +---------------------------+---------------------------+ * 240 | | * = CHPCCWS = * | | * +-------------------------------------------------------+ * 2E0 * *** Overlay for CHPPGM in CHPBK *** Overlay for CHPHEADR in CHPBK * * +---------------------------+---------------------------+ * 2F8 | CHPBLKID | CHPBLKSZ | * +---------------------------+---------------------------+ * 300 | CHPTIME | * +-------------------------------------------------------+ * 308 | CHPOWNER | * +---------------------------+---------------------------+ * 310 | CHPFSEQ | CHPSYSID | * +-------------+------+------+---------------------------+ * 318 | CHPSPID |:HDFLG|//////| CHPMAPCT | * +-------------+------+------+-------------+-------------+ * 320 | CHPPAGNO | CHPPAGCT | CHPXABSZ | * +-------------+-------------+-------------+-------------+ * 328 | CHPTKOFF | CHPXAOFF | CHPDPOFF |/////////////| * +-------------+-------------+-------------+-------------+ * 330 * *** Overlay for CHPHEADR in CHPBK
CHPBK Cross Reference
Symbol Dspl Value -------------- ---- ----- CHPBKCNT 0420 00000002 CHPBLKID 02F8 CHPBLKSZ 02FC CHPCCWS 0240 CHPCCW1 0238 CHPCCW1A 023C CHPCMCLR 0180 CHPCMCRL 0204 00000088 CHPCMCUR 0188 CHPCMSSQ 0184 CHPCMXAB 0190 CHPCURHD 018C CHPCURTK 0180 CHPDPOFF 032C CHPENTRY 01B4 CHPFSEQ 0310 CHPHCCWA 0234 CHPHDCCW 0230 CHPHDENT 0308 CHPHDFLG 031A CHPHEADR 02F8 CHPIOBY 0420 00000480 CHPIODW 0420 00000090 CHPIORBK 0000 CHPLBLKZ 01A0 CHPLENBY 0420 00000318 CHPLIMIT 01B8 CHPLINDX 01BC CHPLLPTR 0198 CHPLOCK 0168 CHPLSTCW 0194 CHPLSTHD 019C CHPMAPCT 031C CHPMSCCW 0228 CHPNEXT 0208 CHPOFFST 01C0 CHPOWNER 0308 CHPPAGCT 0324 CHPPAGNO 0320 CHPPGM 0228 CHPPGMLN 0240 000000B8 CHPPLIST 01CC CHPPLLEN 01CC 00000038 CHPPLMAX 01CC 0000000E CHPPOOLC 01C8 CHPRESVD 0420 CHPSAVE 020C CHPSPID 0318 CHPSYSID 0314 CHPTIME 0300 CHPTKOFF 0328 CHPTKTCT 01AC CHPTKTS 01A4 CHPTKTSH 01A4 CHPTKTST 01A8 CHPXABSZ 0326 CHPXAOFF 032A
Copyright IBM Corporation, 1990, 2002