SNDBK Back to Index page
 
Prolog 
Control Block Contents 
   SNDBK 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.


  SNDBK Prolog Top of page
 
 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
 RELOCATION CONSIDERATIONS : None
 
 
  SNDBK Control Block Content Top of page
 

 SNDBK DSECT Top of page
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' SNDMONO Indicate Single BLK SEND REQ Protocol .1.. .... SNDMULTI X'40' SNDMULTI Indicate Multi BLK SEND REQ Protocol ..1. .... SNDIWAIT X'20' SNDIWAIT Indicate waiting for I/O interrupts ...1 .... SNDSYNC X'10' SNDSYNC 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' SNDBLKNC Bypass MDC processing .... ..11 SNDBLKMB X'03' SNDBLKMB Multi-block request .... ..1. SNDBLKRD X'02' SNDBLKRD Single block read .... ...1 SNDBLKWR X'01' SNDBLKWR Single block write SNDBLKIO SNDTCMSK X'FFFFFFFF'-(SNDBLKNC+SNDBLKMB) SNDTCMSK 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' SNDSVRTY 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 Top of page
 
          
*** 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 Top of page
 
 
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 SNDBLKIO
SNDTRGCL       0018
SNDTRIED       0048
SNDWORKA       0048
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:56:03 EDT.
Copyright IBM Corporation, 1990, 2022