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

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