DFXBK

Prolog  

Control Block Contents  
   DFXBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

DFXBK Prolog

 NAME       : HCPFCWDS
 DESCRIPTION: Define Extent Parameter
 DSECT      : DFXBK

DFXBK Control Block Content

DFXBK DSECT

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

          
*** DFXBK - Define Extent Parameter
*
*     +------+------+-------------+-------------+------+------+
*   0 |:MASK |:ATRB |  DFXBSIZE   |  DFXCACID   |//////|:GATBE|
*     +------+------+-------------+-------------+------+------+
*   8 |         DFXSTART          |          DFXEND           |
*     +---------------------------+---------------------------+
*  10
*
*** DFXBK - Define Extent Parameter

DFXBK Cross Reference

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