IOCON Back to Index page
 
Prolog 
Control Block Contents 
   IOCON 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.


  IOCON Prolog Top of page
  
 NAME       : DMSIOCON
 DESCRIPTION: Console I/O Workarea
 DSECT      : IOCON
 FUNCTION   : To provide a workarea in low storage for the
              first path and device entries opened for better
              performance. Also provides a workarea for
              linemode and XA ccws and I/O control blocks.
              Also provides a communications area for DIAG
              X'264' instruction. Also provides the workarea
              for the SET CMS370AC ON/OFF command.
 
 
  IOCON Control Block Content Top of page
  




 IOCON DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      IOCON          Console I/O Workarea
0000    0 Bitstring  112 IOCPATH        Storage for first path entry
0070  112 Signed       4 * (0)          Device entry on fullword bndry
0070  112 Bitstring 1120 IOCCDEV (0)    Storage for first device entr
0070  112 Bitstring    1 * (1120)       Initialize to 0s
04D0 1232 Bitstring  160 IOCIDAL        IDAL Buffer for XA mode
        INTERACTIVE CONSOLE COMMUNICATION CHANNEL PROGRAM FOR 370
0570 1392 Dbl-Word     8 * (0)
0570 1392 Bitstring    8 IOCSCCW        SENSE CCW FOR 370
0578 1400 Bitstring    8 IOCPCCW        ASCII PROMPT CCW FOR 370
0580 1408 Bitstring    8 IOCCCWS        READ/WRITE CCW FOR 370
0588 1416 Bitstring    8 IOCNCCW        NO-OP CCW FOR 370
        INTERACTIVE CONSOLE COMMUNICATION CHANNEL PROGRAM FOR XA
0590 1424 Dbl-Word     8 * (0)
0590 1424 Bitstring    8 IOCSCCWX       SENSE CCW FOR XA
0598 1432 Bitstring    8 IOCPCCWX       ASCII PROMPT CCW FOR XA
05A0 1440 Bitstring    8 IOCCCWSX       READ/WRITE CCW FOR XA
05A8 1448 Bitstring    8 IOCNCCWX       NO-OP CCW FOR XA
05B0 1456 Signed       4 * (0)
05B0 1456 Bitstring   12 IOCWKCSW (0)   WORK CSW/SCSW MOVED FROM IOSECT
05B0 1456 Signed       4 IOCWKCCF       CONDITION CODES/FLAGS
05B4 1460 Signed       4 IOCWKCCW       ADDR OF LAST CCW EXECUTED
05B8 1464 Bitstring    1 IOCWKUST       UNIT STATUS
05B9 1465 Bitstring    1 IOCWKCST       (SUB)CHANNEL STATUS
05BA 1466 Signed       2 IOCWKRCT       RESIDUAL COUNT
        IRB DEFINITIONS FOR TEST SUB-CHANNEL
05BC 1468 Signed       4 IOCIRB (0)     IRB
05BC 1468 Bitstring   12 IOCISCSW (0)   SUB-CHANNEL STATUS WORD
05BC 1468 Signed       4 IOCICCFL       CONDITION CODES/FLAGS
05C0 1472 Signed       4 IOCICCW        ADDR OF LAST CCW EXECUTED
05C4 1476 Bitstring    1 IOCIUST        UNIT STATUS
          1... ....      IOCIATTN       X'80' IOCIATTN ATTENTION
          .1.. ....      IOCISTMD       X'40' IOCISTMD STATUS MODIFIER
          ..1. ....      IOCICUE        X'20' IOCICUE CONTROL UNIT END
          ...1 ....      IOCIBUSY       X'10' IOCIBUSY BUSY
          .... 1...      IOCICHEN       X'08' IOCICHEN CHANNEL END
          .... .1..      IOCIDVEN       X'04' IOCIDVEN DEVICE END
          .... ..1.      IOCIUNCK       X'02' IOCIUNCK UNIT CHECK
          .... ...1      IOCIUNEX       X'01' IOCIUNEX UNIT EXCEPTION
05C5 1477 Bitstring    1 IOCISCST       SUB-CHANNEL STATUS
05C6 1478 Signed       2 IOCIRCT        RESIDUAL COUNT
05C8 1480 Signed       4 IOCIESW (5)    EXTENDED STATUS WORDS
05DC 1500 Signed       4 IOCIECW (8)    EXTENDED CONTROL WORDS
        ORB DEFINITIONS FOR START SUB-CHANNEL
05FC 1532 Signed       4 IOCORB (0)     ORB
05FC 1532 Signed       4 IOCOINTP       INTERRUPTION PARAMETER
0600 1536 Bitstring    1 IOCOKSR        SUB-CHN KEY, SUSPEND CONTROL FLAG
0601 1537 Bitstring    1 IOCOFPIN       FORMAT, PREFETCH, INTERRUPT FLAGS
          1... ....      IOCOFORM       X'80' IOCOFORM FORMAT CONTROL
          .1.. ....      IOCOPREF       X'40' IOCOPREF PREFETCH CONTROL
0602 1538 Bitstring    1 IOCOLPM        LOGICAL PATH MASK
0603 1539 Bitstring    1 IOCORES        RESERVED
0604 1540 Signed       4 IOCOCPA        CHANNEL PROGRAM ADDRESS
        GENERAL I/O WORK AREA
0608 1544 Bitstring   16 IOCWORK (0)    GEN. PURPOSE I/O WORK AREA
0608 1544 Bitstring    1 IOCWFLG1       FULLSCREEN CONSOLE I/O FLAGS
          1... ....      IOCWASYN       X'80' IOCWASYN ASYNCHRONOUS
                                        INTERRUPT
          .1.. ....      IOCWCP11       X'40' IOCWCP11 VM/ESA CP 1.1 and
                                        higher
          ..1. ....      IOCWCP20       X'20' IOCWCP20 VM/ESA CP 2.0 and
                                        higher
          ...1 ....      IOCWLMQ        X'10' IOCWLMQ 1=Disc/Reco
                                        indicator for linemd
0609 1545 Bitstring    1 IOCWAMOD       AMODE SETTING
060A 1546 Bitstring    2 IOCWFLGS       RESERVED FLAG BYTES
060C 1548 Bitstring   12 IOCWRES        RESERVED
0618 1560 Bitstring    8 IOCCOMM (0)    DIAG X'264' COMMUNICATION AREA
0618 1560 Bitstring    1 IOCCFLG1       FLAG 1 OF COMMUNICATION AREA
          1... ....      IOCCRECO       X'80' IOCCRECO
                                        DISCONNECT/RECONNECT BIT
          .1.. ....      IOCCLMIO       X'40' IOCCLMIO FULLSCR/LINEMODE
                                        BIT (1=LINEMODE)
          ..1. ....      IOCCSHDT       X'20' IOCCSHDT 1=VM DEF DATE
                                        FORMAT IS SHORTDATE
          ...1 ....      IOCCFLDT       X'10' IOCCFLDT 1=VM DEF DATE
                                        FORMAT IS FULLDATE
          .... 1...      IOCCISDT       X'08' IOCCISDT 1=VM DEF DATE
                                        FORMAT IS ISODATE
0619 1561 Bitstring    7 IOCCRES        RESERVED BYTES IN COMM. AREA
0620 1568 Signed       4 IOCCNSID       Subchannel ID of virtual console
       Work area used for the CMS SET CMS370AC command.
         This work area is used to store the I/O New PSW and the
         External New PSW when the SET CMS370AC command is set ON.
0628 1576 Dbl-Word     8 IOC370AC (0)   CMS SET CMS370AC command area
0628 1576 Dbl-Word     8 IOCIOPSW       Area to store the I/O New PSW
0630 1584 Dbl-Word     8 IOCEXPSW       Area to store the External New
                                        PSW
0638 1592 Bitstring    1 IOC370FL       CMS SET CMS370AC flag byte
          1... ....      IOCMS370       X'80' IOCMS370 When ON indicates
                                        CMS370AC active (The initial
                                        setting is OFF)
          .1.. ....      IOCCP370       X'40' IOCCP370 When ON indicates
                                        CMS370AC turned CP SET 370ACCOM
                                        ON
0639 1593 Bitstring    3 IO370RES       Reserved bytes in CMS370AC area
          0000063C       IOCSIZE        *-IOCON Length of I/O Console
                                        workarea
          000000C8       IOCDBSZ        ((IOCSIZE+7)/8) Size of IOCON in
                                        doublewords
 
 
  IOCON Storage Layout Top of page
  
          
*** IOCON - Console I/O Workarea
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       IOCPATH                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  70 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 4D0 |                                                       |
*     =                       IOCIDAL                         =
*     |                                                       |
*     +-------------------------------------------------------+
* 570 |                       IOCSCCW                         |
*     +-------------------------------------------------------+
* 578 |                       IOCPCCW                         |
*     +-------------------------------------------------------+
* 580 |                       IOCCCWS                         |
*     +-------------------------------------------------------+
* 588 |                       IOCNCCW                         |
*     +-------------------------------------------------------+
* 590 |                       IOCSCCWX                        |
*     +-------------------------------------------------------+
* 598 |                       IOCPCCWX                        |
*     +-------------------------------------------------------+
* 5A0 |                       IOCCCWSX                        |
*     +-------------------------------------------------------+
* 5A8 |                       IOCNCCWX                        |
*     +---------------------------+---------------------------+
* 5B0 |         IOCWKCCF          |         IOCWKCCW          |
*     +------+------+-------------+---------------------------+
* 5B8 |:WKUST|:WKCST|  IOCWKRCT   |         IOCICCFL          |
*     +------+------+-------------+------+------+-------------+
* 5C0 |         IOCICCW           |:IUST |:ISCST|  IOCIRCT    |
*     +---------------------------+------+------+-------------+
* 5C8 |                                                       |
*     =                       IOCIESW                         =
*     |                           +---------------------------+
*     |                           |                           |
*     +---------------------------+                           |
* 5E0 |                                                       |
*     =                       IOCIECW                         =
*     |                           +---------------------------+
* 5F8 |                           |         IOCOINTP          |
*     +------+------+------+------+---------------------------+
* 600 |:OKSR |:OFPIN|:OLPM |:ORES |         IOCOCPA           |
*     +------+------+------+------+---------------------------+
* 608 |:WFLG1|:WAMOD|  IOCWFLGS   |         IOCWRES           |
*     +------+------+-------------+                           |
*     |                                                       |
*     +------+------------------------------------------------+
* 618 |:CFLG1|                    IOCCRES                     |
*     +------+--------------------+---------------------------+
* 620 |         IOCCNSID          |///////////////////////////|
*     +---------------------------+---------------------------+
* 628 |                       IOCIOPSW                        |
*     +-------------------------------------------------------+
* 630 |                       IOCEXPSW                        |
*     +------+--------------------+---------------------------+
* 638 |:370FL|     IO370RES       | 63C
*     +------+--------------------+
*
*** IOCON - Console I/O Workarea
 
 
  IOCON Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
IOCCCWS        0580
IOCCCWSX       05A0
IOCCDEV        0070
IOCCFLDT       0618 10
IOCCFLG1       0618
IOCCISDT       0618 08
IOCCLMIO       0618 40
IOCCNSID       0620
IOCCOMM        0618
IOCCP370       0638 40
IOCCRECO       0618 80
IOCCRES        0619
IOCCSHDT       0618 20
IOCDBSZ        0639 000000C8
IOCEXPSW       0630
IOCIATTN       05C4 80
IOCIBUSY       05C4 10
IOCICCFL       05BC
IOCICCW        05C0
IOCICHEN       05C4 08
IOCICUE        05C4 20
IOCIDAL        04D0
IOCIDVEN       05C4 04
IOCIECW        05DC
IOCIESW        05C8
IOCIOPSW       0628
IOCIRB         05BC
IOCIRCT        05C6
IOCISCST       05C5
IOCISCSW       05BC
IOCISTMD       05C4 40
IOCIUNCK       05C4 02
IOCIUNEX       05C4 01
IOCIUST        05C4
IOCMS370       0638 80
IOCNCCW        0588
IOCNCCWX       05A8
IOCOCPA        0604
IOCOFORM       0601 80
IOCOFPIN       0601
IOCOINTP       05FC
IOCOKSR        0600
IOCOLPM        0602
IOCOPREF       0601 40
IOCORB         05FC
IOCORES        0603
IOCPATH        0000
IOCPCCW        0578
IOCPCCWX       0598
IOCSCCW        0570
IOCSCCWX       0590
IOCSIZE        0639 0000063C
IOCWAMOD       0609
IOCWASYN       0608 80
IOCWCP11       0608 40
IOCWCP20       0608 20
IOCWFLGS       060A
IOCWFLG1       0608
IOCWKCCF       05B0
IOCWKCCW       05B4
IOCWKCST       05B9
IOCWKCSW       05B0
IOCWKRCT       05BA
IOCWKUST       05B8
IOCWLMQ        0608 10
IOCWORK        0608
IOCWRES        060C
IOC370AC       0628
IOC370FL       0638
IO370RES       0639
 
This information is based on z/VM 7.4.0 Last updated on 24 Jun 2024 at 11:37:58 EDT.
Copyright IBM Corporation, 1990, 2024