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 7.3.0 Last updated on 22 Jun 2022 at 15:57:56 EDT.
Copyright IBM Corporation, 1990, 2022