Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

ARSDT

Prolog  

Control Block Contents  
   ARSDT DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

ARSDT Prolog

 Name       : HCPARSDT
 Description: Access Real Subsystem Data Area
 DSECT      : ARSDT
 Function   : Map resident data area for Diagnose X'254'
              in entry point HCPIOD25.
 Located by : Acon ADDR of HCPIOD25
 Created by : none
 Deleted by : none
 

ARSDT Control Block Content

ARSDT DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      ARSDT          Access Real Subsystem Data Area
0000    0 Dbl-Word     8 ARSLOCKW (3)   Access Real Subsystem lockword
0018   24 Address      4 ARSVDEVA       Address of 1st "pseudo" Vdev
001C   28 Address      4 ARSUSQUE       Address of linked list containing
                                        users unsolicited status ARUBKs
0020   32 Address      4 ARSMSQUE       Address of linked list containing
                                        ARMGEs from closed connections
0024   36 Bitstring   12 *              Reserved
          00000030       ARSDTBYL       *-ARSDT Byte length of ARSDT
          00000006       ARSDTDSZ       ((ARSDTBYL+7)/8) Doubleword
                                        length of ARSDT
 

ARSDT Storage Layout

          
*** ARSDT - Access Real Subsystem Data Area
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       ARSLOCKW                        =
*     |                                                       |
*     +---------------------------+---------------------------+
*  18 |         ARSVDEVA          |         ARSUSQUE          |
*     +---------------------------+---------------------------+
*  20 |         ARSMSQUE          |///////////////////////////|
*     +---------------------------+///////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  30
*
*** ARSDT - Access Real Subsystem Data Area
 

ARSDT Cross Reference

Symbol         Dspl Value
-------------- ---- -----
ARSDTBYL       0024 00000030
ARSDTDSZ       0024 00000006
ARSLOCKW       0000
ARSMSQUE       0020
ARSUSQUE       001C
ARSVDEVA       0018
This information is based on z/VM V5R2.0. Last updated on 12 Apr 2006 at 16:39:56 EDT.
Copyright IBM Corporation, 1990, 2005