IOPBK Back to Index page
 
Prolog 
Control Block Contents 
   IOPBK 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.


  IOPBK Prolog Top of page
 
 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 Control Block Content Top of page
 

 IOPBK DSECT Top of page
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 Storage Layout Top of page
 
          
*** 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
 
 
  IOPBK Cross Reference Top of page
 
 
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
 
This information is based on z/VM 7.1.0 Last updated on 22 Jun 2018 at 11:50:08 EDT.
Copyright IBM Corporation, 1990, 2018