MONSK

Prolog  

Control Block Contents  
   MONSK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

MONSK Prolog

 NAME       : HCPMONSK
 DESCRIPTION: Monitor SEEKs Mapping
 DSECT      : MONSK
 FUNCTION   : Map the data needed for monitoring SEEK CCWs
 LOCATED BY : None
 CREATED BY : Dynamically created when needed.
 DELETED BY : Dynamically deleted when 'using' task is finished.
 SERIALIZED : None
 Notes      : This control block is bilingual.  The fields within it can
              be referenced in either ASSEMBLER or PLAS modules.
 Notes      : The fields in this control block are used for FBA
              devices as well as CKD/ECKD devices.  For FBA
              devices a LOCATE is considered a 'SEEK', and
              cylinder values are calculated from block numbers.

MONSK Control Block Content

MONSK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      MONSK          Monitor SEEKs Mapping
0000    0 Signed       4 MONPOSCT       Access arm positioning count
          .... ...1      MONPOS1        1 Indicate 1 ccw causing arm
                                        movement
0004    4 Signed       4 MONPOSSM       Sum of arm motion
          .... ....      MONPOSM0       0 Indicate 0 arm motion summation
0008    8 Signed       2 MONSCYL        1st 'SEEK' address in chan prog
000A   10 Signed       2 MONECYL        Last 'SEEK' address in chan prog
000C   12 Signed       2 MONHEAD        Head number
000E   14 Bitstring    1 MONIFLG        Information flag
          .... ..1.      MONDPOSD       X'02' Monitor SEEK data is valid
          .... ...1      MONDWRIT       X'01' Chan prog has WRITE CCWs
000F   15 Bitstring    1 *              Reserved for IBM use
          00000002       MONSKSZ        ((*-MONSK)+7)/8 MONSK size in
                                        double words
          .... ....      MONCYL0        X'00' Cylinder 0 equate

MONSK Storage Layout

          
*** MONSK - Monitor SEEKs Mapping
*
*     +---------------------------+---------------------------+
*   0 |         MONPOSCT          |         MONPOSSM          |
*     +-------------+-------------+-------------+------+------+
*   8 |  MONSCYL    |  MONECYL    |  MONHEAD    |:IFLG |//////|
*     +-------------+-------------+-------------+------+------+
*  10
*
*** MONSK - Monitor SEEKs Mapping

MONSK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
MONCYL0        000F 00
MONDPOSD       000E 02
MONDWRIT       000E 01
MONECYL        000A
MONHEAD        000C
MONIFLG        000E
MONPOSCT       0000
MONPOSM0       0004 00
MONPOSSM       0004
MONPOS1        0000 01
MONSCYL        0008
MONSKSZ        000F 00000002