NAME       : HCPAMSG
 DESCRIPTION: Asynchronous Event Message
 DSECT      : AMSG
 FUNCTION   : Preserve a Delayed Response Message until retrieved by
              requestor.
 LOCATED BY : Pointer (VDEVAEVT) in the Virtual Device Block
              Pointer (VDEVREVT) in the Virtual Device Block
              Pointer (SCTMFPT/SCTMLPT) in CFLF Subsystem
              Connect Table (See NOTES below).
 CREATED BY : HCPSVIAP - Delayed Response Message Routing.
              HCPLFPSF - CFLF Perform Subsystem Function CCW
              Simulation (See NOTES below).
 DELETED BY : HCPAEPPD - Purge all outstanding AEBK, AMSG and IOCM blocks
              for the Virtual Device.
              HCPAEPRD - Retrieve Delayed Response Message (CCW SIMULATION)
              HCPLFSIM - CFLF Read Subsystem Data CCW simulation
              (See NOTES below).
 RELOCATION CONSIDERATIONS : This control block is relocated as part of a live
              guest relocation (LGR).  The bits and fields that
              need to be relocated are defined in the
              corresponding LGRAMSG COPY file.  Whenever changes
              are made to this control block, consideration must
              be given to any effects these changes will have on
              a relocation.  If any new fields or bits are
              defined, they may need to be relocated.  If
              existing bits or fields are changed, corresponding
              modifications may be required in the LGR version of
              this control block.  Consider also the effects of
              these changes on a relocation involving a back-level
              release of CP.
 NOTES      : This block is also used by the CFLF simulation
              support. In thi case the Asynchronous Message block
              is allocated and returned either Synchronously or
              Asynchronously to a CFLF user during Read Subsystem
              Data CCW simulation.

 AMSG DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      AMSG           Asynchronous Event Message
0000    0 Bitstring   24 AMSGHDR (0)    Header record
0000    0 Address      4 AMSGNEXT       Pointer to next AMSG block NOTE:
                                        must be at the same offset as
                                        IOCMNEXT in the HCPIOCM block.
0004    4 Character    4 AMSGBKID       Identifies storage area as an
                                        AMSG block. NOTE: must be at the
                                        same offset as IOCMBKID in the
                                        HCPIOCM block.
0008    8 Signed       4 AMSGTLG        Length of the entire message
                                        Block in BYTES = Header
                                        Length(AMSGHDRL) + Content
                                        Length.
000C   12 Signed       4 AMSGMGID       Message ID
0010   16 Signed       2 AMSGLGH        Length of the message
0012   18 Bitstring    1 AMSGEVST       Asynchronous Event status NOTES :
                                        There is not a strict
                                        relationship between this status
                                        and DRM status.
          00000001       AMSGNOEV       X'01' AMSGNOEV Event does not
                                        exist at device.
          00000002       AMSGPNEV       X'02' AMSGPNEV Event pending
                                        completion in the device.
          00000004       AMSGCPEV       X'04' AMSGCPEV Event completed at
                                        the device.
0013   19 Bitstring    1 AMSGSESS       Session ID
0014   20 Character    4 *              Reserved for future IBM use
          00000018       AMSGHDRL       *-AMSGNEXT Length of Header in
                                        bytes
0018   24 Bitstring    1 AMSGBUF (0)    Message buffer contents -
                                        Variable length data. See HCPDMSG
                                        for an overlay of the AMSGBUF
                                        field.
          0000021C       AMSGMAXB       540 Maximum number of bytes of
                                        storage needed for the
                                        Asynchronous Message Buffer. Code
                                        defined for Setting/Testing
                                        AMSGBKID
          00D4E2C7       AMSGID         C'AMSG' Used to set block
                                        identifier

          
*** AMSG - Asynchronous Event Message
*
*     +---------------------------+---------------------------+
*   0 |         AMSGNEXT          |         AMSGBKID          |
*     +---------------------------+---------------------------+
*   8 |         AMSGTLG           |         AMSGMGID          |
*     +-------------+------+------+---------------------------+
*  10 |  AMSGLGH    |:GEVST|:GSESS|///////////////////////////|
*     +-------------+------+------+---------------------------+
*
*** AMSG - Asynchronous Event Message

 
Symbol         Dspl Value
-------------- ---- -----
AMSGBKID       0004
AMSGBUF        0018
AMSGCPEV       0012 00000004
AMSGEVST       0012
AMSGHDR        0000
AMSGHDRL       0014 00000018
AMSGID         0018 00D4E2C7
AMSGLGH        0010
AMSGMAXB       0018 0000021C
AMSGMGID       000C
AMSGNEXT       0000
AMSGNOEV       0012 00000001
AMSGPNEV       0012 00000002
AMSGSESS       0013
AMSGTLG        0008