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