DCTBL Back to Index page
 
Prolog 
Control Block Contents 
   DCTBL 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.


  DCTBL Prolog Top of page
  
 NAME       : HCPDCTBL
 DESCRIPTION: Device Characteristics Table
 DSECT      : DCTBL
 FUNCTION   : The Device CHaracteristics Table is used to
              map status information for each type of device
              supported.
 LOCATED BY : VIODDITB - VIOMI pointer containing address of this
              table.
 CREATED BY : DCTBLs are generated by invoking the HCPDCTGN
              macro.
 DELETED BY : DCTBLs are never deleted.
 SERIALIZED : DCTBLs are only referenced ('read from') and never
              altered. Therefore, no serialization is required.
 RELOCATION CONSIDERATIONS : None
 
 
  DCTBL Control Block Content Top of page
  




 DCTBL DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DCTBL          Device Characteristics Table
0000    0 Character    4 DCTEBCDC       EBCDIC device type
0004    4 Bitstring    1 DCTSNSFL       Sense Data validity flags
          1... ....      DCTCUIV        X'80' DCTCUIV control unit info
                                        is valid
          .1.. ....      DCTDVIV        X'40' DCTDVIV device info is
                                        valid
0005    5 Bitstring    7 DCTSNSID (0)   SENSE ID information:
0005    5 Bitstring    4 DCTCUINF (0)   (X'FF' & control unit info)
0005    5 Bitstring    1 DCTSNSFF       'FF'X
0006    6 Bitstring    6 DCTSNSDT (0)   (actual data portion)
0006    6 Bitstring    2 DCTCUID        Control Unit ID
0008    8 Bitstring    1 DCTCUMF        Control Unit Model/Features
0009    9 Bitstring    3 DCTDVINF (0)   (device info)
0009    9 Bitstring    2 DCTDVID        Device ID
000B   11 Bitstring    1 DCTDVMF        Device Model/Features
000C   12 Address      4 DCTVIODD       Address of Dedicated-Device VIOMI
0010   16 Address      4 DCTVIOSH       Address of Shared-Device VIOMI
0014   20 Address      4 DCTVIOSM       Address of Simulated-Device VIOMI
0018   24 Address      4 DCTDINFO       Address of device-specific info
          00000004       DCTSIZE        (*-DCTBL+7)/8 Size, in
                                        doublewords, of DCTBL
 
 
  DCTBL Storage Layout Top of page
  
          
*** DCTBL - Device Characteristics Table
*
*     +---------------------------+------+------+-------------+
*   0 |         DCTEBCDC          |:SNSFL|:SNSFF|  DCTCUID    |
*     +------+-------------+------+------+------+-------------+
*   8 |:CUMF |  DCTDVID    |:DVMF |         DCTVIODD          |
*     +------+-------------+------+---------------------------+
*  10 |         DCTVIOSH          |         DCTVIOSM          |
*     +---------------------------+---------------------------+
*  18 |         DCTDINFO          | 1C
*     +---------------------------+
*
*** DCTBL - Device Characteristics Table
 
 
  DCTBL Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DCTCUID        0006
DCTCUINF       0005
DCTCUIV        0004 80
DCTCUMF        0008
DCTDINFO       0018
DCTDVID        0009
DCTDVINF       0009
DCTDVIV        0004 40
DCTDVMF        000B
DCTEBCDC       0000
DCTSIZE        0018 00000004
DCTSNSDT       0006
DCTSNSFF       0005
DCTSNSFL       0004
DCTSNSID       0005
DCTVIODD       000C
DCTVIOSH       0010
DCTVIOSM       0014
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:48:52 EDT.
Copyright IBM Corporation, 1990, 2022