Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

HDRBK

Prolog  

Control Block Contents  

HDRBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

HDRBK Prolog
 NAME       : DMSHDRBK
 DESCRIPTION: Free storage element header
 DSECT      : HDRBK
 FUNCTION   : Mapping macro which maps unallocated
              pieces of storage within a page.

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HDRBK Control Block Content

HDRBK DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      HDRBK          Free storage element header
     *** HDRBK -
     +***************------------+***************------------+ 0 | HDRFORWD
     | HDRLEN | +***************------------+***************------------+ 8
     *** HDRBK -
0000    0 Signed       4 HDRFORWD       Pointer to next piece of free
                                        storage
0004    4 Signed       4 HDRLEN         Size of this piece of free
                                        storage

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HDRBK Storage Layout

*** HDRBK - Free storage element header
*
*     +---------------------------+---------------------------+
*   0 |         HDRFORWD          |          HDRLEN           |
*     +---------------------------+---------------------------+
*   8
*
*** HDRBK - Free storage element header

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HDRBK Cross Reference

(contains links to field and bit definitions)

Symbol         Dspl Value
-------------- ---- -----
HDRFORWD       0000
HDRLEN         0004

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This information is based on VM/ESA 2.4.0.
Last updated on 12 Aug 1999 at 11:13:26 EDT.
Copyright IBM Corporation, 1990, 1999