Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### SNDBK

Prolog

Control Block Contents
SNDBK DSECT

Storage Layout

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' 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

    *** 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

    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 V6R1.0. Last updated on 18 Feb 2010 at 09:06:04 EDT.
Copyright IBM Corporation, 1990, 2008