INTBLOK

Prolog  

Control Block Contents  
   INTBLOK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

INTBLOK Prolog

 Name       : INTBLOK
 Description: I/O Interrupt Block
 DSECT      : INTBLOK
 Function   : Mapping macro which maps information
              stored when an I/O interrupt occurs. INTBLOK
              maps the user provided area indicated by the
              INTBLOK parameter of the HNDIO macro.

INTBLOK Control Block Content

INTBLOK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      INTBLOK        I/O Interrupt Block
0000    0 Bitstring    8 INTXACOD (0)   Interrupt information
0000    0 Signed       4 INTPARM        For XA/XC, interruption
                                        parameter; for 370, 0
0004    4 Bitstring    4 INTIDENT (0)   For XA/XC, subsystem ID word
                                        (SID); for 370, see individual
                                        components
0004    4 Signed       2 *              For XA/XC, X'0001'; for 370, 0
0006    6 Signed       2 INTSUBCH       For XA/XC, subchannel number; for
                                        370, use INTDEVAD
0006    6 Signed       2 INTDEVAD       For XA/XC, use INTSUBCH; for 370,
                                        device address
0008    8 Dbl-Word     8 INTPSW         I/O old PSW
0010   16 Bitstring   64 INTXAIRB (0)   For XA/XC, actual interruption
                                        response block (IRB); for 370,
                                        constructed IRB
0010   16 Bitstring   12 INTSCSW (0)    For XA/XC, actual subchannel
                                        status word (SCSW); for 370,
                                        constructed SCSW
0010   16 Bitstring    1 INTSCCTL       Key, S, L, and CC
0011   17 Bitstring    1 *              For XA/XC, miscellaneous SCSW
                                        bits; for 370, 0
          1... ....      INTCCWFM       X'80' For XA/XC, CCW format; for
                                        370, 0
0012   18 Bitstring    2 *              For XA/XC, more miscellaneous
                                        SCSW bits; for 370, 0
0014   20 Address      4 INTCCWAD       For XA/XC, CCW address; for 370,
                                        X'00' and 3-byte CCW address
0018   24 Bitstring    1 INTDEVST       Device status
0019   25 Bitstring    1 INTSCHST       For XA/XC, subchannel status; for
                                        370, channel status
001A   26 Signed       2 INTRCNT        Residual byte count
001C   28 Signed       4 * (13)         For XA/XC, extended status word
                                        (ESW) and extended control word
                                        (ECW); for 370, 0
0050   80 Bitstring    1 INTSTAT        Status of INTBLOK information
          1... ....      INTFAIL        X'80' For XA/XC, if 1, TSCH
                                        failed and IRB is not valid; for
                                        370, always 0
          .1.. ....      INTPS370       X'40' For XA/XC, always 0 (actual
                                        information given); for 370,
                                        always 1 (constructed, or
                                        "pseudo", information given)
0051   81 Bitstring    1 *              Reserved
0052   82 Signed       2 INTDEVNO       Saved device addr for user exit
          00000054       INTBLKSZ       *-INTBLOK INTBLOK length

INTBLOK Storage Layout

          
*** INTBLOK - I/O Interrupt Block
*
*     +---------------------------+-------------+-------------+
*   0 |         INTPARM           |/////////////|  INTSUBCH   |
*     +---------------------------+-------------+-------------+
*   8
*
*** INTBLOK - I/O Interrupt Block
          
*** Overlay for INTSUBCH in INTBLOK
*
*                                               +-------------+
*   0 ...                                     6 |  INTDEVAD   |
*     +-----------------------------------------+-------------+
*   8 |                        INTPSW                         |
*     +------+------+-------------+---------------------------+
*  10 |:SCCTL|//////|/////////////|         INTCCWAD          |
*     +------+------+-------------+---------------------------+
*  18 |:DEVST|:SCHST|  INTRCNT    |///////////////////////////|
*     +------+------+-------------+///////////////////////////|
*  20 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +------+------+-------------+---------------------------+
*  50 |:STAT |//////|  INTDEVNO   | 54
*     +------+------+-------------+
*
*** Overlay for INTSUBCH in INTBLOK

INTBLOK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
INTBLKSZ       0052 00000054
INTCCWAD       0014
INTCCWFM       0011 80
INTDEVAD       0006
INTDEVNO       0052
INTDEVST       0018
INTFAIL        0050 80
INTIDENT       0004
INTPARM        0000
INTPSW         0008
INTPS370       0050 40
INTRCNT        001A
INTSCCTL       0010
INTSCHST       0019
INTSCSW        0010
INTSTAT        0050
INTSUBCH       0006
INTXACOD       0000
INTXAIRB       0010