IBM: HDRBK

Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

HDRBK

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.

HDRBK Control Block Content

HDRBK DSECT

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

HDRBK Storage Layout

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

HDRBK Cross Reference

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

This information is based on z/VM V4R3.0.
Last updated on 1 May 2002 at 14:04:50 EDT.
Copyright IBM Corporation, 1990, 2002