HDRBK | Back to Index page

| Prolog Control Block Contents HDRBK 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.

HDRBK Prolog | Top of page

     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 | Top of page

     HDRBK DSECT
    Top of page

    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 | Top of page

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

HDRBK Cross Reference | Top of page

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

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:36:19 EDT.
Copyright IBM Corporation, 1990, 2020