Programming Interface Information:
The Monitor Records are intended Programming Interfaces that
allow the customer to write programs to obtain services of z/VM.

MRIODSON

Prolog
Control Block Contents
Storage Layout
Cross Reference

MRIODSON Prolog

 DSECT NAME - IODSON
 FUNCTION - Map a Monitor record.
 LOCATED BY -
        Through the Monitor Control Area
 REFERENCED CONTROL BLOCKS -
        MRRECHDR    Monitor Record Header
 NAME - MRIODSON
 DESCRIPTIVE NAME - Monitor Event Record
                    Domain 6 - I/O Domain
                    Record 11- Vary On Subchannel
 DESCRIPTION - Indicates that a subchannel has been varied online


MRIODSON Control Block Contents

Offsets
Dec Hex  Type       Len  Name (Dim)          Description
 
  0   0  Structure   44  IODSON              Start of monitor record
  0   0  Character    0  IODSON_MRHDR        Record header. See MRRECHDR for
                                             details.
  0   0  Character   20  MRHDR               
  0   0  Unsigned     2  MRHDRLEN            record length in bytes
  2   2  Unsigned     2  MRHDRZER            field of zeros
  4   4  Unsigned     1  MRHDRDM             domain identifier
  5   5  Unsigned     1  *                   
  6   6  Unsigned     2  MRHDRRC             record identifier
  8   8  Character    8  MRHDRTOD            Time at which this record was
                                             built. In time-of-day (TOD) clock
                                             format. See IBM System 370 XA
                                             Principle of Operation for
                                             explanation of format.
 16  10  Character    4  *                   
 20  14  Character    0  MRHDR_END           End of header
 20  14  Bitstring    1  IODSON_RDEVTYPE     Device type code. Unique for
                                             each device within the class in
                                             IODSON_RDEVCLAS.
 21  15  Bitstring    1  IODSON_RDEVCLAS     Device class code. Unique for
                                             each class.
 22  16  Unsigned     2  IODSON_RDEVDVID     Device type. See IODSON_RDEVDVIV
                                             for its source.
 24  18  Bitstring    1  IODSON_CALMODLN     Device model identifier. See
                                             IODSON_RDEVDVIV flag for its
                                             source.
 25  19  Bitstring    1  IODSON_RDEVLPM      Logical path mask
 26  1A  Unsigned     2  IODSON_RDEVDEV      Device number
 28  1C  Unsigned     4  IODSON_RDEVSID      Host subchannel id
 32  20  Character    8  IODSON_RDEVCHPS     Eight channel path ids for this
                                             device
 40  28  Unsigned     2  IODSON_RDEVCUID     control unit id. Applicable only
                                             when IODSON_RDEVCUIV = on.
 42  2A  Unsigned     1  IODSON_RDEVCUMN     Control unit model identifier.
                                             Applicable only when
                                             IODSON_RDEVCUIV = on.
 43  2B  Bitstring    1  IODSON_CALFLAGS     Flag Byte
          1... ....      IODSON_RDEVDVIV     OFF = device model number (in
                                             IODSON_RDEVDVID) and model
                                             identifier (in IODSON_CALMODLN)
                                             were provided by user through the
                                             RDEVICE macro or device sensing at
                                             IPL time. ON = device type number
                                             and model identifier were provided
                                             by the device at device
                                             initialization time.
          .1.. ....      IODSON_RDEVCUIV     When on, Control unit
                                             information is supplied in
                                             IODSON_RDEVCUID and
                                             IODSON_RDEVCUMN.
          ..1. ....      *                   
          ...1 ....      *                   
          .... 1...      *                   
          .... .1..      *                   
          .... ..1.      *                   
          .... ...1      *                   
 44  2C  Character    0  IODSON_END          

MRIODSON Cross Reference

                      Hex           Hex
Name                 Offset Length Value
 
IODSON                  0     44
IODSON_CALFLAGS        2B      1
IODSON_CALMODLN        18      1
IODSON_END             2C      0
IODSON_MRHDR            0      0
IODSON_RDEVCHPS        20      8
IODSON_RDEVCLAS        15      1
IODSON_RDEVCUID        28      2
IODSON_RDEVCUIV        2B           40
IODSON_RDEVCUMN        2A      1
IODSON_RDEVDEV         1A      2
IODSON_RDEVDVID        16      2
IODSON_RDEVDVIV        2B           80
IODSON_RDEVLPM         19      1
IODSON_RDEVSID         1C      4
IODSON_RDEVTYPE        14      1
MRHDR                   0     20
MRHDR_END              14      0
MRHDRDM                 4      1
MRHDRLEN                0      2
MRHDRRC                 6      2
MRHDRTOD                8      8
MRHDRZER                2      2

This information is based on z/VM V4R3.0.
Last updated on 1 May 2002 at 16:20:33.
Copyright IBM Corporation, 1990, 2002