NAME       : HCPIOPBK
 DESCRIPTION: I/O Passthrough Block
 DSECT      : IOPBK
 FUNCTION   : A IOPBK contains information related to the
              execution of a virtual machine eligible to use
              the SIE Assist for its dedicated I/O.
 LOCATED BY : VMDIOPBK  Field of the preferred guest's Origin
              VMDBK
              The first part of the IOPBK is a TRQBK, so it may
              also appear on the timer supervisor queue, or be
              stacked on the VMDBK.
 CREATED BY : HCPBVM    When a user logs on in the V=F area.
 DELETED BY : HCPUSO    When the V=F user logs off.
 RELOCATION CONSIDERATIONS : None

 IOPBK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      IOPBK          I/O Passthrough Block
     OPTRQBK DS    (TRQSIZE)D         Timer Request Block
0000    0 Dbl-Word     8 IOPTRQBK (7)   Timer Request Block
     <CMT>*  DS    (LKWRDSIZ)D        Lockword for synchronizing
0038   56 Dbl-Word     8 IOPLKWRD (3)   Lockword for synchronizing the
                                        timer exit and the cancellation
                                        routine
0050   80 Signed       4 IOPTMCNT       count of entries to CFM while I/O
                                        Passthrough was active
0054   84 Signed       4 IOPXTCNT       count of timer expirations before
                                        cancellations
0058   88 Signed       4 IOPQQCNT       count of cancellations in less
                                        than 1024 microseconds
005C   92 Signed       4 IOPLLCNT       count of cancellation after more
                                        than 64 sec
0060   96 Signed       4 IOPXCNTS (16)  array of counts of cancellations
                                        in interval with lower bound
                                        1024*(2**i) microseconds (i = 0
                                        15)
00A0  160 Signed       4 *              Reserved for Future IBM Use
00A4  164 Bitstring    1 IOPACTZN       Active zone number
00A5  165 Bitstring    1 * (3)          Reserved
00A8  168 Signed       4 *              Reserved for Future IBM Use
00AC  172 Signed       4 *              Reserved for Future IBM Use
00B0  176 Dbl-Word     8 *              Reserved for Future IBM Use
          000000B8       IOPLEN         *-IOPBK Size of the IOPBK in
                                        bytes
          00000017       IOPSIZE        (IOPLEN+7)/8 Size of the IOPBK in
                                        doublewords

          
*** IOPBK - I/O Passthrough Block
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       IOPTRQBK                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  38 |                                                       |
*     =                       IOPLKWRD                        =
*     |                                                       |
*     +---------------------------+---------------------------+
*  50 |         IOPTMCNT          |         IOPXTCNT          |
*     +---------------------------+---------------------------+
*  58 |         IOPQQCNT          |         IOPLLCNT          |
*     +---------------------------+---------------------------+
*  60 |                                                       |
*     =                       IOPXCNTS                        =
*     |                                                       |
*     +---------------------------+------+--------------------+
*  A0 |///////////////////////////|:ACTZN|////////////////////|
*     +---------------------------+------+--------------------+
*  A8 |///////////////////////////|///////////////////////////|
*     +---------------------------+---------------------------+
*  B0 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  B8
*
*** IOPBK - I/O Passthrough Block

 
Symbol         Dspl Value
-------------- ---- -----
IOPACTZN       00A4
IOPLEN         00B0 000000B8
IOPLKWRD       0038
IOPLLCNT       005C
IOPQQCNT       0058
IOPSIZE        00B0 00000017
IOPTMCNT       0050
IOPTRQBK       0000
IOPXCNTS       0060
IOPXTCNT       0054