DFXBK Back to Index page
 
Prolog 
Control Block Contents 
   DFXBK 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.


  DFXBK Prolog Top of page
 
 NAME       : HCPFCWDS
 DESCRIPTION: Define Extent Parameter
 DSECT      : DFXBK
 
 
  DFXBK Control Block Content Top of page
 

 DFXBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DFXBK Define Extent Parameter 0000 0 Bitstring 1 DFXMASK Mask byte 0001 1 Bitstring 1 DFXATRB Global attributes 0002 2 Signed 2 DFXBSIZE Block size in bytes 0004 4 Signed 4 DFXEXTLO (0) Extent locator for FBA The following redefines the DFXEXTLO for ECKD devices 0004 4 Bitstring 2 DFXCACID Cache fast write ID 0006 6 Character 1 * 0007 7 Bitstring 1 DFXGATBE Global Attributes Extended .... .1.. DFXSTDRZ X'04' DFXSTDRZ Regular record zero 0008 8 Bitstring 4 DFXSTART Beginning of extent 000C 12 Bitstring 4 DFXEND End of extent 11.. .... DFXECKD X'C0' DFXECKD Mask to check architecture
 
 
  DFXBK Storage Layout Top of page
 
          
*** DFXBK - Define Extent Parameter
*
*     +------+------+-------------+-------------+------+------+
*   0 |:MASK |:ATRB |  DFXBSIZE   |  DFXCACID   |//////|:GATBE|
*     +------+------+-------------+-------------+------+------+
*   8 |         DFXSTART          |          DFXEND           |
*     +---------------------------+---------------------------+
*  10
*
*** DFXBK - Define Extent Parameter
 
 
  DFXBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
DFXATRB        0001
DFXBSIZE       0002
DFXCACID       0004
DFXECKD        000C C0
DFXEND         000C
DFXEXTLO       0004
DFXGATBE       0007
DFXMASK        0000
DFXSTART       0008
DFXSTDRZ       0007 04
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:50:28 EDT.
Copyright IBM Corporation, 1990, 2022