Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

IJJHDLST

Prolog  

Control Block Contents  

IJJHDLST DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

IJJHDLST Prolog

Name : IJJHDLST Description: Volume Descriptor List DSECT : IJJHDLST Function : IJJHDLST describes the fields within the common VTOC handler descriptor list and is used in the CMS/DOS environment. IJJHDLST is called by the IJJHDLST macro.

 

IJJHDLST Control Block Content


IJJHDLST DSECT

Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure IJJHDLST Volume Descriptor List 0000 0 Bitstring 1 DLFLAGS PROCESSING FLAGS 1... .... DLSHROPT X'80' SHARE OPTION EXCLUSIVE .1.. .... DLDEVFBA X'40' FBA DEVICE ..1. .... DLDLGOT X'20' DLIST GETVISED BY CVH ...1 .... DLWAGOT X'10' WORKAREA GETVISED BY CVH .... 1... DLOPENED X'08' VTOC WAS OPENED .... .1.. DLF4DONE X'04' F4 BITS PROCESSED .... ..1. DLIRIOER X'02' ACCEPT IRRECOVERABLE I/O ERROR 0001 1 Bitstring 1 * RESERVED 0002 2 Character 6 DLVOLID VOLUME SERIAL NUMBER 0008 8 Character 2 DLSYSNO (0) SYSTEM LOGICAL UNIT NO. 0008 8 Character 1 DLSYSNO1 FIRST BYTE OF SYS-NUMBER 0009 9 Character 1 DLSYSNO2 SECOND BYTE OF SYS-NUMBER 000A 10 Character 1 * RESERVED 000B 11 Character 5 DLVSTART (0) VTOC START ADDRESS (CKD) 000B 11 Character 1 DLBLKCI BLOCKS PER CI (FBA) 000C 12 Signed 4 DLVSTRTB PBN OF VTOC START (FBA) 0010 16 Bitstring 4 DLVEND VTOC END ADDRESS 0014 20 Address 4 DLWRKA WORKAREA ADDRESS 0018 24 Bitstring 4 DLDEVCAP DEVICE CAPACITY 001C 28 Signed 4 DLVCISZ VTOC CI SIZE (FBA) 0020 32 Address 4 DLCVHADR ADDR OF CVH TOP MODULE 0024 36 Address 4 DLBTRK BLOCKS PER TRACK FOR FBA 0028 40 Address 4 DLCIAREA ADDR OF FBA CI AREA 0030 48 Dbl-Word 8 * (0) 00000030 DLLEN *-IJJHDLST LENGTH 00000006 DLSTDWDS (*-IJJHDLST)/8 DOUBLEWORDS

 

IJJHDLST Storage Layout

*** IJJHDLST - Volume Descriptor List
*
*     +------+------+-----------------------------------------+
*   0 |:LAGS |//////|                DLVOLID                  |
*     +------+------+------+------+---------------------------+
*   8 |:YSNO1|:YSNO2|//////|:LKCI |         DLVSTRTB          |
*     +------+------+------+------+---------------------------+
*  10 |          DLVEND           |          DLWRKA           |
*     +---------------------------+---------------------------+
*  18 |         DLDEVCAP          |         DLVCISZ           |
*     +---------------------------+---------------------------+
*  20 |         DLCVHADR          |          DLBTRK           |
*     +---------------------------+---------------------------+
*  28 |         DLCIAREA          |///////////////////////////|
*     +---------------------------+---------------------------+
*  30
*
*** IJJHDLST - Volume Descriptor List

 

IJJHDLST Cross Reference

(contains links to field and bit definitions)
Symbol         Dspl Value
-------------- ---- -----

DLBLKCI 000B

DLBTRK 0024

DLCIAREA 0028

DLCVHADR 0020

DLDEVCAP 0018

DLDEVFBA 0000 40

DLDLGOT 0000 20

DLFLAGS 0000

DLF4DONE 0000 04

DLIRIOER 0000 02

DLLEN 0030 00000030

DLOPENED 0000 08

DLSHROPT 0000 80

DLSTDWDS 0030 00000006

DLSYSNO 0008

DLSYSNO1 0008

DLSYSNO2 0009

DLVCISZ 001C

DLVEND 0010

DLVOLID 0002

DLVSTART 000B

DLVSTRTB 000C

DLWAGOT 0000 10

DLWRKA 0014


This information is based on VM/ESA 2.4.0.
Last updated on 12 Aug 1999 at 11:21:33 EDT.
Copyright IBM Corporation, 1990, 1999