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Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
SNDBK
Cross Reference (Contains links to field and bit definitions)
SNDBK Prolog
NAME : HCPSNDBK
DESCRIPTION: *BLOCKIO's IUCV SEND Request Block
DSECT : SNDBK
FUNCTION : This DSECT maps data relating to a multiple
or single BLOCKIO request.
LOCATED BY : DBISNDAD in HCPDBIRQ
BLKSNDAD in HCPBLKIO
CREATED BY : HCPBIM
DELETED BY : HCPBIM
SERIALIZED : Unique task execution
VMDBK dispatch lock.
BLKIO Lock
SNDBK Control Block Content
SNDBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SNDBK *BLOCKIO's IUCV SEND Request Block 0000 0 Address 4 SNDNEXT Pointer to next SNDBK for this virtual device 0004 4 Bitstring 1 SNDOPER Operation field for SEND Request 1... .... SNDMONO X'80' Indicate Single BLK SEND REQ Protocol .1.. .... SNDMULTI X'40' Indicate Multi BLK SEND REQ Protocol ..1. .... SNDIWAIT X'20' Indicate waiting for I/O interrupts ...1 .... SNDSYNC X'10' Guest is requesting syn- chronous processing. 0005 5 Bitstring 1 SNDRC IUCV Reply Return Code 0006 6 Signed 2 SNDSSHCT Number of real SSCH issued to handle this send request. 0008 8 Dbl-Word 8 SNDIL2IA IUCV *BLOCKIO indirect level-2 operand I-ASIT. This I-ASIT identifies the address space containing *BLOCKIO indirect level-2 operands, the guest mulit-block data buffer addresses. 0010 16 Signed 4 SNDDVIAD Pointer to first DVIOP block for this set of I/O requests 0014 20 Signed 4 SNDMSGID IUCV message id 0018 24 Signed 4 SNDTRGCL IUCV target class 001C 28 Signed 4 * Reserved for future IBM use 0020 32 Dbl-Word 8 SNDIL1IA IUCV *BLOCKIO indirect level-1 operand I-ASIT. This I-ASIT identifies the address space containing *BLOCKIO indirect level-1 operand, the multi-block parameter list. 0028 40 Address 4 SNDPLADR Address of the multiple block parameter list in host real storage 002C 44 Signed 4 SNDPLSIZ Size of the multiple block parameter list in bytes 0030 48 Signed 2 SNDPLCNT Count of elements in the multiple block parameter list 0032 50 Signed 2 SNDDBICT Count of DBIRQ blocks sent to HCPIOS 0034 52 Signed 4 SNDGPLST Guest address of the multiple block parameter list in host 0038 56 Signed 4 * Reserved for Future IBM Use 003C 60 Signed 4 * Reserved for Future IBM Use 0040 64 Dbl-Word 8 SNDSINGL Storage for a single block I/O version of the multiple block I/O parameter list 0048 72 Dbl-Word 8 SNDWORKA (3) Work area for HCPBIM. Since HCPBIMIN does not have a SAVBK available, this is to be used as a scratch area. 0060 96 Dbl-Word 8 * (0) Ensure double word boundary 0060 96 Bitstring 40 SNDPARML IUCV reply parameter list 00000011 SNDSIZE (*-SNDBK+7)/8 Size, in doublewords, of SNDBK 0018 24 Bitstring 1 * (3) 001B 27 Bitstring 1 SNDBLKIO Blockio service request 1... .... SNDBLKNC X'80' Bypass MDC processing .... ..11 SNDBLKMB X'03' Multi-block request .... ..1. SNDBLKRD X'02' Single block read .... ...1 SNDBLKWR X'01' Single block write 00FFFF7C SNDTCMSK X'FFFFFFFF'-(SNDBLKNC+SNDBLKMB) Mask to test for valid data in the IPTRGCL/SNDTRGCL fields Remapping of the work area Remapping for routine SCHEDULE_IO, while processing VDISK I/O. 0048 72 Signed 4 SNDTRIED For VDISK DVIOPs whose I/O must be retried, contains the number of I/Os already attempted. 004C 76 Bitstring 1 SNDSVVDF Byte to contain saved flag information for VDISK I/O processing. 1... .... SNDSVRTY X'80' DVIENTRYs must be retried. 004D 77 Bitstring 1 SNDSVRC Save the error return code for HCPQDL until the entries whose I/Os were successful are marked. 004E 78 Bitstring 1 * (2) Reserved for IBM use. 0050 80 Dbl-Word 8 * (2) Reserved for IBM use. End of work area remapping
SNDBK Storage Layout
*** SNDBK - *BLOCKIO's IUCV SEND Request Block * * +---------------------------+------+------+-------------+ * 0 | SNDNEXT |:OPER |SNDRC | SNDSSHCT | * +---------------------------+------+------+-------------+ * 8 | SNDIL2IA | * +---------------------------+---------------------------+ * 10 | SNDDVIAD | SNDMSGID | * +---------------------------+---------------------------+ * 18 | SNDTRGCL |///////////////////////////| * +---------------------------+---------------------------+ * 20 | SNDIL1IA | * +---------------------------+---------------------------+ * 28 | SNDPLADR | SNDPLSIZ | * +-------------+-------------+---------------------------+ * 30 | SNDPLCNT | SNDDBICT | SNDGPLST | * +-------------+-------------+---------------------------+ * 38 |///////////////////////////|///////////////////////////| * +---------------------------+---------------------------+ * 40 | SNDSINGL | * +-------------------------------------------------------+ * 48 | | * = SNDWORKA = * | | * +-------------------------------------------------------+ * 60 | | * = SNDPARML = * | | * +-------------------------------------------------------+ * 88 * *** SNDBK - *BLOCKIO's IUCV SEND Request Block *** Overlay for SNDTRGCL in SNDBK * * +--------------------+------+ * 18 |////////////////////|:BLKIO| 1C * +--------------------+------+ * *** Overlay for SNDTRGCL in SNDBK *** Overlay for SNDWORKA in SNDBK * * +---------------------------+------+------+-------------+ * 48 | SNDTRIED |:SVVDF|:SVRC |/////////////| * +---------------------------+------+------+-------------+ * 50 |///////////////////////////////////////////////////////| * |///////////////////////////////////////////////////////| * +-------------------------------------------------------+ * 60 * *** Overlay for SNDWORKA in SNDBK
SNDBK Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----SNDBLKIO 001B
SNDBLKMB 001B 03
SNDBLKNC 001B 80
SNDBLKRD 001B 02
SNDBLKWR 001B 01
SNDDBICT 0032
SNDDVIAD 0010
SNDGPLST 0034
SNDIL1IA 0020
SNDIL2IA 0008
SNDIWAIT 0004 20
SNDMONO 0004 80
SNDMSGID 0014
SNDMULTI 0004 40
SNDNEXT 0000
SNDOPER 0004
SNDPARML 0060
SNDPLADR 0028
SNDPLCNT 0030
SNDPLSIZ 002C
SNDRC 0005
SNDSINGL 0040
SNDSIZE 0060 00000011
SNDSSHCT 0006
SNDSVRC 004D
SNDSVRTY 004C 80
SNDSVVDF 004C
SNDSYNC 0004 10
SNDTCMSK 001B 00FFFF7C
SNDTRGCL 0018
SNDTRIED 0048
SNDWORKA 0048
Last updated on 3 Aug 1999 at 12:33:02 EDT.
Copyright IBM Corporation, 1990, 1999