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