FTXBK

Prolog  

Control Block Contents  
   FTXBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

FTXBK Prolog

 NAME       : HCPFTXBK
 DESCRIPTION: Frame Table Extent Block
 DSECT      : FTXBK
 FUNCTION   : Contain Frame Table scan range addresses
 CREATED BY : HCPIFTIX
 DELETED BY : NA
 LOCATED BY : RSAFTXFL - FTXBK chain for frames < 2G
              RSAFTXFG - FTXBK chain for frames >= 2G
              RSAFTXGC - Global FTXBK chain (contains all FTXBKs in
              no guaranteed order)
 SERIALIZED : RSAFTXLK
 RELOCATION CONSIDERATIONS : None
 NOTES      : The RSMBK contains 2 FTXBks, one for <2G and one for >2G.
              In a system with nothing >2G, there will still be this
              FTXBK.  In order to indicate that an FTXBK is not
              actually describing anything, a bogus value will be
              used for the FRMTE ranges.  Any bogus value would
              do.  Zero is the chosen bogus value.

FTXBK Control Block Content

FTXBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FTXBK          Frame Table Extent Block
0000    0 Address      4 FTXNEXT        Next FTXBK address
0004    4 Address      4 FTXPREV        Previous FTXBK address
0008    8 Address      4 FTXNEXTG       Global next; chain is unordered;
                                        includes <2G and >2G
                                        FTXBKs; chain ends with pointer
                                        of zero
000C   12 Address      4 *              Reserved for IBM use
0010   16 Address      8 FTXlo          Host logical address of FRMTE at
                                        which this range of real storage
                                        begins.
0018   24 Address      8 FTXhi          Host logical address of FRMTE at
                                        which this range of real storage
                                        ends.
0020   32 Address      8 FTXSTART       Host logical address of FRMTE at
                                        which to start frame table scan
                                        for this extent. FTXSTART will be
                                        within the range FTXlo-FTXhi.
0028   40 Address      8 FTXEND         Host logical address of FRMTE at
                                        which to end frame table scan for
                                        this extent. FTXEND will be
                                        within the range FTXlo-FTXhi.
          00000006       FTXSIZE        (*-FTXBK+7)/8 FTXBK size in
                                        doublewords

FTXBK Storage Layout

          
*** FTXBK - Frame Table Extent Block
*
*     +---------------------------+---------------------------+
*   0 |         FTXNEXT           |         FTXPREV           |
*     +---------------------------+---------------------------+
*   8 |         FTXNEXTG          |///////////////////////////|
*     +---------------------------+---------------------------+
*  10 |                        FTXLO                          |
*     +-------------------------------------------------------+
*  18 |                        FTXHI                          |
*     +-------------------------------------------------------+
*  20 |                       FTXSTART                        |
*     +-------------------------------------------------------+
*  28 |                        FTXEND                         |
*     +-------------------------------------------------------+
*  30
*
*** FTXBK - Frame Table Extent Block

FTXBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
FTXhi          0018
FTXlo          0010
FTXEND         0028
FTXNEXT        0000
FTXNEXTG       0008
FTXPREV        0004
FTXSIZE        0028 00000006
FTXSTART       0020