IBM: AEBK

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.

AEBK

Prolog

Control Block Contents

AEBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

AEBK Prolog

 NAME       : HCPAEBK
 DESCRIPTION: Asynchronous Event Block
 DSECT      : AEBK
 FUNCTION   : To keep track of pending asynchronous event.
 LOCATED BY : Pointer (CUIAEBK) in the Control Unit Information
              Block.
 CREATED BY : HCPAEPCI - Create AEBK for CP command and Queue to CUIBK
              HCPDUPUN - DASD Untranslation Processor
 DELETED BY : HCPAEPPD - Locate and purge all AEBK, AMSG, and IOCM Blocks
              for the Virtual Device
              HCPSVIAP - Reflect Asynchronous message to VDEV
              HCPDUPUN - DASD Untranslation Processor

AEBK Control Block Content


AEBK DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      AEBK           Asynchronous Event Block
0000    0 Address      4 AEBKNEXT       Pointer to next Asynchronous
                                        Event Block.
0004    4 Address      4 AEBKCUI        Pointer to Control Unit Block
0008    8 Address      4 AEBKVDEV       Pointer to Virtual Device Block
000C   12 Address      4 AEBKRDEV       Pointer to Real Device Block
0010   16 Address      4 AEBKUSER       Pointer to VMDBK of Guest that
                                        requested the Delayed Response
                                        Message.
0014   20 Signed       4 AEBKMGID       Message ID
0018   24 Address      4 AEBKEXIT       Address of exit to call when the
                                        Delayed Response Message is
                                        received for CP.
001C   28 Character    4 AEBKPARM       Parameter passed to entry
                                        specified in AEBKEXIT.
0020   32 Signed       4 AEBKFPRM       Function defined area.
0024   36 Signed       2 AEBKVSUB       Virtual Subchannel number on
                                        which the request was made.
0026   38 Bitstring    1 AEBKSESS       Session ID
0027   39 Bitstring    1 AEBKTYPE       Type of AEBK
          00000000       AEBKTCCM       X'00' CP Command Message
          00000001       AEBKTAGI       X'01' Asyn. Guest IO
          00000002       AEBKTTZC       X'02' Concopy
0028   40 Bitstring    1 AEBKVKEY       Valid Key
          00000000       AEBKVMID       X'00' Valid Message ID
          00000001       AEBKVSID       X'01' Valid Session ID
0029   41 Character    7 *              Reserved for future IBM use.
          00000006       AEBKSIZE       ((*-AEBK)+7)/8 Block size in
                                        doublewords.

AEBK Storage Layout

*** AEBK - Asynchronous Event Block
*
*     +---------------------------+---------------------------+
*   0 |         AEBKNEXT          |         AEBKCUI           |
*     +---------------------------+---------------------------+
*   8 |         AEBKVDEV          |         AEBKRDEV          |
*     +---------------------------+---------------------------+
*  10 |         AEBKUSER          |         AEBKMGID          |
*     +---------------------------+---------------------------+
*  18 |         AEBKEXIT          |         AEBKPARM          |
*     +---------------------------+-------------+------+------+
*  20 |         AEBKFPRM          |  AEBKVSUB   |:KSESS|:KTYPE|
*     +------+--------------------+-------------+------+------+
*  28 |:KVKEY|////////////////////////////////////////////////|
*     +------+------------------------------------------------+
*  30
*
*** AEBK - Asynchronous Event Block