DEFDSECT Back to Index page
 
Prolog 
Control Block Contents 
   DEFDSECT 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.

 
  DEFDSECT Control Block Content Top of page
  




 DEFDSECT DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DEFDSECT       ,
0000    0 Bitstring   16 EXTAREA (0)
0000    0 Bitstring    1 EXTMASK        MASK BYTE **------
          00000000       EXTWNORM       B'00000000' ALLOW NORMAL WRITES
          00000040       EXTWNONE       B'01000000' INHIBIT ALL WRITES
          00000080       EXTWUPD        B'10000000' UPDATE WRITES ONLY
          000000C0       EXTWALL        B'11000000' ALLOW ALL WRITES
                                        ---**---
          00000000       EXTPSALL       B'00000000' PERMIT ALL SEEKS &
                                        RECAL
          00000008       EXTPSCH        B'00001000' PERMIT SEEK CYL &
                                        HEAD
          00000010       EXTPSH         B'00010000' PERMIT SEEK HEAD
          00000018       EXTISEEK       B'00011000' INHIBIT ALL SEEKS
                                        -----**-
          00000000       EXTDINON       B'00000000' NORMAL OPERATIONS
          00000002       EXTDIDSA       B'00000010' DEVICE SUPPORT
                                        AUTHORIZATION CHAN
          00000004       EXTDIAG        B'00000100' DIAGNOSTIC
                                        AUTHORIZATION
          00000006       EXTDIINH       B'00000110' DSA WITH INHIBIT DATA
                                        CORRECTION -------
          00000001       EXTPCI         B'00000001' PCI FETCH MODE
0001    1 Bitstring    1 EXTGLOBL       GLOBAL ATTRIBUTES
          .... ....      EXTFBA         B'00000000' EXTFBA FB-512 MODE
          11.. ....      EXTECKD        B'11000000' EXTECKD ECKD MODE
                                        ---***-- CACHE CONTROLS
          .... ....      EXTCNCR        B'00000000' EXTCNCR NORMAL CACHE
                                        REPLACMENT
          .... .1..      EXTCBYP        B'00000100' EXTCBYP BYASS CACHE
          .... 1...      EXTCICL        B'00001000' EXTCICL INHIBIT CACHE
                                        LOADING
          .... 11..      EXTCSA         B'00001100' EXTCSA SEQUENTIAL
                                        ACCESS
          ...1 ....      EXTCSP         B'00010000' EXTCSP SEQUENTIAL
                                        PRESTAGE
          ...1 .1..      EXTCRA         B'00010100' EXTCRA RECORD ACCESS
                                        ------*- CACHE CONTROLS
          .... ..1.      EXTCCFWD       B'00000010' EXTCCFWD CACHE FAST
                                        WRITE DATA
          .... ...1      EXTCIDFW       B'00000001' EXTCIDFW INHIBIT DASD
                                        FAST WRITE
0002    2 Signed       2 EXTSIZE        AVERAGE BLOCK SIZE
0004    4 Signed       2 EXTCFWID       CACHE FAST WRITE DATA
                                        IDENTIFICATION
0006    6 Bitstring    1 EXTGLOBA       GLOBAL ATTRIBUTES ADDITIONAL
0007    7 Bitstring    1 EXTGLOBE       GLOBAL ATTRIBUTES EXTENDED
0008    8 Bitstring    4 EXTBCCCH (0)   BEGINNING 28-BIT ADDRESS
0008    8 Signed       2 EXTBEGCC       BEGINNING CYLINDER
000A   10 Signed       2 EXTBEGHH       BEGINNING HEAD
000C   12 Bitstring    4 EXTECCCH (0)   END 28-BIT ADDRESS
000C   12 Signed       2 EXTENDCC       END CYLINDER
000E   14 Signed       2 EXTENDHH       END HEAD
             ECKD LOCATE RECORD DEFINITION
          .1.. .111      CCWLR          X'47' LOCATE RECORD
 
 
  DEFDSECT Storage Layout Top of page
  
          
*** DEFDSECT - Control Block in DEFDSECT
*
*     +------+------+-------------+-------------+------+------+
*   0 |:MASK |:GLOBL|  EXTSIZE    |  EXTCFWID   |:GLOBA|:GLOBE|
*     +------+------+-------------+-------------+------+------+
*   8 |  EXTBEGCC   |  EXTBEGHH   |  EXTENDCC   |  EXTENDHH   |
*     +-------------+-------------+-------------+-------------+
*  10
*
*** DEFDSECT - Control Block in DEFDSECT
 
 
  DEFDSECT Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
CCWLR          000E 47
EXTAREA        0000
EXTBCCCH       0008
EXTBEGCC       0008
EXTBEGHH       000A
EXTCBYP        0001 04
EXTCCFWD       0001 02
EXTCFWID       0004
EXTCICL        0001 08
EXTCIDFW       0001 01
EXTCNCR        0001 00
EXTCRA         0001 14
EXTCSA         0001 0C
EXTCSP         0001 10
EXTDIAG        0000 00000004
EXTDIDSA       0000 00000002
EXTDIINH       0000 00000006
EXTDINON       0000 00000000
EXTECCCH       000C
EXTECKD        0001 C0
EXTENDCC       000C
EXTENDHH       000E
EXTFBA         0001 00
EXTGLOBA       0006
EXTGLOBE       0007
EXTGLOBL       0001
EXTISEEK       0000 00000018
EXTMASK        0000
EXTPCI         0000 00000001
EXTPSALL       0000 00000000
EXTPSCH        0000 00000008
EXTPSH         0000 00000010
EXTSIZE        0002
EXTWALL        0000 000000C0
EXTWNONE       0000 00000040
EXTWNORM       0000 00000000
EXTWUPD        0000 00000080
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:59:22 EDT.
Copyright IBM Corporation, 1990, 2022