MONSK | Back to Index page

| Prolog Control Block Contents MONSK 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.

MONSK Prolog | Top of page

     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
     RELOCATION CONSIDERATIONS : 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 | Top of page

     MONSK DSECT
    Top of page

    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 MONPOS1 Indicate 1 ccw causing
                                            arm movement
    0004    4 Signed       4 *              * IBM RESERVED *
    0008    8 Signed       2 *              * IBM RESERVED *
    000A   10 Signed       2 *              * IBM RESERVED *
    000C   12 Signed       2 MONHEAD        Head number
    000E   14 Bitstring    1 MONIFLG        Information flag
              .... ..1.      MONDPOSD       X'02' MONDPOSD Monitor SEEK data
                                            is valid
              .... ...1      MONDWRIT       X'01' MONDWRIT Chan prog has
                                            WRITE CCWs
    000F   15 Bitstring    1 *              Reserved for IBM use
    0010   16 Signed       8 MONPOSSM64     Sum of arm motion
              ...1 .1..      MONPOSSM       00004 MONPOSSM64+4,4
    0018   24 Signed       4 MONSCYL32      1st 'SEEK' address in chan pr
              ...1 1.1.      MONSCYL        00002 MONSCYL32+2,2
    001C   28 Signed       4 MONECYL32      Last 'SEEK' address in chan p
              ...1 111.      MONECYL        00002 MONECYL32+2,2
              00000004       MONSKSZ        ((*-MONSK)+7)/8 MONSK size in
                                            double words
              .... ....      MONCYL0        X'00' Cylinder 0 equate

MONSK Storage Layout | Top of page

    *** MONSK - Monitor SEEKs Mapping
    *
    *     +---------------------------+---------------------------+
    *   0 |         MONPOSCT          |///////////////////////////|
    *     +-------------+-------------+-------------+------+------+
    *   8 |/////////////|/////////////|  MONHEAD    |:IFLG |//////|
    *     +-------------+-------------+-------------+------+------+
    *  10 |                      MONPOSSM64                       |
    *     +---------------------------+---------------------------+
    *  18 |        MONSCYL32          |        MONECYL32          |
    *     +---------------------------+---------------------------+
    *  20
    *
    *** MONSK - Monitor SEEKs Mapping

MONSK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    MONCYL0        001C 00
    MONDPOSD       000E 02
    MONDWRIT       000E 01
    MONECYL        001C 1E
    MONECYL32      001C
    MONHEAD        000C
    MONIFLG        000E
    MONPOSCT       0000
    MONPOSSM       0010 14
    MONPOSSM64     0010
    MONPOS1        0000 01
    MONSCYL        0018 1A
    MONSCYL32      0018
    MONSKSZ        001C 00000004

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:29:13 EDT.
Copyright IBM Corporation, 1990, 2020