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 Top of page
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