DFRMP Back to Index page
 
Prolog 
Control Block Contents 
   DFRMP 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.


  DFRMP Prolog Top of page
  
 NAME       : HCPDFRMP
 DESCRIPTION: DDEV Frame Map
 DSECT      : DFRMP
 FUNCTION   : Maps storage frames used to temporarily store
              DDEVs associated with a particular user's
              directory entry
 LOCATED BY : DVMDIDAS
 CREATED BY : HCPUDR
 DELETED BY : HCPLGB
 SERIALIZED : A share of the directory lock is held when copying all of
              the DDEVs associated with a user's directory entry into
              DFRMP storage.
 RELOCATION CONSIDERATIONS : None
 
 
  DFRMP Control Block Content Top of page
  




 DFRMP DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DFRMP          DDEV Frame Map
0000    0 Address      4 DFRNEXT        Pointer to next temporary DDEV
                                        storage frame
0004    4 Signed       4 DFRDDVCT       Count of DDEVs in this frame
0008    8 Signed       4 * (2)          Reserved for IBM use
          00000010       DFRHSIZE       (*-DFRMP) Size of header in bytes
                                        **** THE VALUE OF DDEVSIZE FOR
                                        DATAMAP IS 7
          00000027       DFRDDVSL       (4096-DFRHSIZE)/(DDEVSIZE*8) The
                                        number of DDEV slots to a frame.
0010   16 Bitstring    1 DFRDDEV (0)    Start of actual DDEV storage
 
 
  DFRMP Storage Layout Top of page
  
          
*** DFRMP - DDEV Frame Map
*
*     +---------------------------+---------------------------+
*   0 |         DFRNEXT           |         DFRDDVCT          |
*     +---------------------------+---------------------------+
*   8 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*
*** DFRMP - DDEV Frame Map
 
 
  DFRMP Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DFRDDEV        0010
DFRDDVCT       0004
DFRDDVSL       0008 00000027
DFRHSIZE       0008 00000010
DFRNEXT        0000
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:49:05 EDT.
Copyright IBM Corporation, 1990, 2022