UFOHDR | Back to Index page

| Prolog Control Block Contents UFOHDR 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.

UFOHDR Control Block Content | Top of page

     UFOHDR DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      UFOHDR         VIRTUAL MACHINE DEFINITION BLOCK
    0000    0 Address      8 VMDFR1STG      1st user owned list frame entry
                                            (Initialized as pointing to
                                            itself)
    0008    8 Address      8 VMDFRLSTG      Last user owned list frame entry
                                            (Initially points to VMDFR1STG)
    0010   16 Address      8 VMDUFEACT      UFO list last FRMTE on the act
                                            list (Initially points to
                                            VMDFR1STG)
    0018   24 Signed       4 VMDIBTGHW      VMDUFIBTG field's high water mark
    001C   28 Signed       4 VMDIBTGLW      VMDUFIBTG field's low water mark
    0020   32 Signed       4 VMDUFACTC      UFO list count of FRMTEs in the
                                            active section. The associated
                                            pages are valid.
    0024   36 Signed       4 VMDUFIBTG      Target size of UFO IBR section
    0028   40 Signed       4 VMDUFIBRC      UFO list count of FRMTEs in the
                                            IBR section. It is likely the
                                            associated pages are in the IBR
                                            state, however, revalidation of
                                            an IBR page may not move the
                                            FRMTE to the active section in
                                            order to minimize path length of
                                            the revalidation process or
                                            because serialization could not
                                            be obtained.
    002C   44 Signed       4 VMDUIBRVC      UFO IBR revalidation count since
                                            last cyclic list visit
    0030   48 Signed       4 VMDUIBRVH      UFO IBR revalidation historical
                                            rate
    0034   52 Signed       4 VMDUIBIVC      UFO IBR invalidation count since
                                            last cyclic list visit
    0038   56 Signed       4 VMDUIBIVH      UFO IBR invalidation historical
                                            rate
              00000008       UFOHDRDW       (*-UFOHDR+7)/8 Size in
                                            doublewords

UFOHDR Storage Layout | Top of page

    *** UFOHDR - VIRTUAL MACHINE DEFINITION BLOCK
    *
    *     +-------------------------------------------------------+
    *   0 |                      VMDFR1STG                        |
    *     +-------------------------------------------------------+
    *   8 |                      VMDFRLSTG                        |
    *     +-------------------------------------------------------+
    *  10 |                      VMDUFEACT                        |
    *     +---------------------------+---------------------------+
    *  18 |        VMDIBTGHW          |        VMDIBTGLW          |
    *     +---------------------------+---------------------------+
    *  20 |        VMDUFACTC          |        VMDUFIBTG          |
    *     +---------------------------+---------------------------+
    *  28 |        VMDUFIBRC          |        VMDUIBRVC          |
    *     +---------------------------+---------------------------+
    *  30 |        VMDUIBRVH          |        VMDUIBIVC          |
    *     +---------------------------+---------------------------+
    *  38 |        VMDUIBIVH          | 3C
    *     +---------------------------+
    *
    *** UFOHDR - VIRTUAL MACHINE DEFINITION BLOCK

UFOHDR Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    UFOHDRDW       0038 00000008
    VMDFRLSTG      0008
    VMDFR1STG      0000
    VMDIBTGHW      0018
    VMDIBTGLW      001C
    VMDUFACTC      0020
    VMDUFEACT      0010
    VMDUFIBRC      0028
    VMDUFIBTG      0024
    VMDUIBIVC      0034
    VMDUIBIVH      0038
    VMDUIBRVC      002C
    VMDUIBRVH      0030

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:31:47 EDT.
Copyright IBM Corporation, 1990, 2020