SXEQ Back to Index page
 
Prolog 
Control Block Contents 
   SXEQ DSECT
   SXEWK 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.

 
  SXEQ Control Block Content Top of page
  




 SXEQ DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SXEQ           Storage Extension Work Area
0000    0 Signed       8 SXEQsize       - Size of 1 set, bytes
0008    8 Signed       8 SXEQstill      - Count of sets still on the
                                        chain.
0010   16 Signed       4 *              - Reserved
0014   20 Signed       4 *              - Reserved
0018   24 Signed       8 SXEQneedO      - Count of sets that were
                                        originally/actually needed.
0020   32 Address      8 SXEQhead       - Pointer to the first entry in a
                                        queue of frame sets. Points to
                                        the lowest frame in the frame
                                        set.
0028   40 Signed       8 SXEQneedN      - Count of sets that are still
                                        needed.
0030   48 Address      8 SXEQtail       - Last frame set, so that we can
                                        append to the end
0038   56 Signed       8 SXEQneedC      - Count of frame sets that were
                                        consumed.
          00000040       SXEQLen        *-SXEQ




 SXEWK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SXEWK          Storage Extension Work Area
      Start and end of the real memory that will be attached and
      assigned by SERVC hardware requests.
0000    0 Address      8 SXEHDST        Storage extension start address
0008    8 Address      8 SXEHDSTF       FRMTE address for SXEHDST
0010   16 Signed       8 SXEHDSAI       Address-incr for SXEHDST
0018   24 Signed       8 *              Reserved for IBM use
0020   32 Address      8 SXEHDND        A(Storage extension last byte)
0028   40 Address      8 SXEHDNDF       FRMTE address for SXEHDND
0030   48 Signed       8 SXEHDNAI       Address-incr for SXEHDND
0038   56 Signed       8 *              Reserved for IBM use
      Description of the extension that CP will use.
0040   64 Address      8 SXESTART       Storage extension start address
0048   72 Address      8 SXEEND         Storage extension last address
0050   80 Signed       8 *              Reserved for IBM use
0058   88 Signed       8 *              Reserved for IBM use
      The size by which SXS addressability will be increased.
0060   96 Address      8 SXESXSST       SXS growth start address. Because
                                        real memory B2G and Host Logical
                                        Addressability B2G march together
                                        (all because of the use of EDAT-1
                                        for SXSTB) it is expected that
                                        the contents of SXESXSST will
                                        equal SXEHDST.
0068  104 Signed       8 SXESXSSZ       SXS growth in bytes. This will be
                                        zero if SYSSXSSZ is already at
                                        maximum.
0070  112 Signed       8 *              Reserved for IBM use
0078  120 Signed       8 *              Reserved for IBM use
      The pretend ASCE when the DAT structures to be added are
      being built.
0080  128 Address      8 SXEASCE        Pretend ASCE when building DAT
     * Define SXE1st for the first SXEQ DSECT defined.
          00000090       SXEfrst        *
     * Define SXEQs for Frame Sets of different sizes.
0090  144 Bitstring   64 SXEGQ          SXEQ for 2G Frame Set
00D0  208 Bitstring   64 SXEMQ          SXEQ for 1M Frame Set
0110  272 Bitstring   64 SXE4Q          SXEQ for 16K Frame Set
0150  336 Bitstring   64 SXE1Q          SXEQ for 4K Frame Set
     * Define SXElast beyond the last SXEQ DSECT defined.
          00000190       SXElast        *
0190  400 Address      4 *              Reserved
      When a calculation is performed in order to determine the
      requirements for frame sets of each size, the
      calculations start at the ASCE level and drill through
      all levels of the DAT structure.
      A distinction is made for the reason for the frame sets.
      For example, to calculate the number of frame sets for
      some FRMTB addressability, we would include the number of
        16K (AKA 4F)  RTT  Region First Tables
        16K (AKA 4F)  RST  Region Second Tables
        16K (AKA 4F)  RTT  Region Third Tables
        16K (AKA 4F)  ST   Segment Tables
         4K (AKA 1F)  PT   Page Tables
         4K (AKA 1F)  BF   Backing Frames
      Following each such calculation, the counts for each
      frame set size and its usage are accumulated in a final
      count array.
      If a prior calculation had already included calculations
      that would be for the same pieces, say the same Region
      First Table, then that calculation's count is cleared
      before the accumulating so that double counting is not
      performed.
0198  408 Dbl-Word     8 GFn (0)        Alignment
0198  408 Signed       8 GFn1Fp         1F frame set for PT
01A0  416 Signed       8 GFn4Fs         4F frame set for ST
01A8  424 Signed       8 GFn4Fr3        4F frame set for RTT
01B0  432 Signed       8 GFn4Fr2        4F frame set for RST
01B8  440 Signed       8 GFn4Fr1        4F frame set for RFT
          0GFn4Fr1       GFn4Fr         GFn4Fs GFn4Fr When we're not
                                        exactly sure how a 4F frame set
                                        will be used, stick the count in
                                        the ST counter GFn4Fs
01C0  448 Signed       8 GFn1Fb         1F frame set for backing
01C8  456 Signed       8 GFn1Mb         1M frame set for backing
01D0  464 Signed       8 GFn2Gb         2G frame set for backing
          00000040       GFnLen         (*-GFn+7)/8*8 Length of counters
          0000003B       SXESZD         (*-SXEWK+7)/8 SXEWK size in
                                        dwords
 
 
  SXEQ Storage Layout Top of page
  
          
*** SXEQ - Storage Extension Work Area
*
*     +-------------------------------------------------------+
*   0 |                       SXEQSIZE                        |
*     +-------------------------------------------------------+
*   8 |                      SXEQSTILL                        |
*     +---------------------------+---------------------------+
*  10 |///////////////////////////|///////////////////////////|
*     +---------------------------+---------------------------+
*  18 |                      SXEQNEEDO                        |
*     +-------------------------------------------------------+
*  20 |                       SXEQHEAD                        |
*     +-------------------------------------------------------+
*  28 |                      SXEQNEEDN                        |
*     +-------------------------------------------------------+
*  30 |                       SXEQTAIL                        |
*     +-------------------------------------------------------+
*  38 |                      SXEQNEEDC                        |
*     +-------------------------------------------------------+
*  40
*
*** SXEQ - Storage Extension Work Area
          
*** SXEWK - Storage Extension Work Area
*
*     +-------------------------------------------------------+
*   0 |                       SXEHDST                         |
*     +-------------------------------------------------------+
*   8 |                       SXEHDSTF                        |
*     +-------------------------------------------------------+
*  10 |                       SXEHDSAI                        |
*     +-------------------------------------------------------+
*  18 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  20 |                       SXEHDND                         |
*     +-------------------------------------------------------+
*  28 |                       SXEHDNDF                        |
*     +-------------------------------------------------------+
*  30 |                       SXEHDNAI                        |
*     +-------------------------------------------------------+
*  38 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  40 |                       SXESTART                        |
*     +-------------------------------------------------------+
*  48 |                        SXEEND                         |
*     +-------------------------------------------------------+
*  50 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  58 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  60 |                       SXESXSST                        |
*     +-------------------------------------------------------+
*  68 |                       SXESXSSZ                        |
*     +-------------------------------------------------------+
*  70 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  78 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  80 |                       SXEASCE                         |
*     +-------------------------------------------------------+
*  88 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  90 |                                                       |
*     =                        SXEGQ                          =
*     |                                                       |
*     +-------------------------------------------------------+
*  D0 |                                                       |
*     =                        SXEMQ                          =
*     |                                                       |
*     +-------------------------------------------------------+
* 110 |                                                       |
*     =                        SXE4Q                          =
*     |                                                       |
*     +-------------------------------------------------------+
* 150 |                                                       |
*     =                        SXE1Q                          =
*     |                                                       |
*     +---------------------------+---------------------------+
* 190 |///////////////////////////|///////////////////////////|
*     +---------------------------+---------------------------+
* 198 |                        GFN1FP                         |
*     +-------------------------------------------------------+
* 1A0 |                        GFN4FS                         |
*     +-------------------------------------------------------+
* 1A8 |                       GFN4FR3                         |
*     +-------------------------------------------------------+
* 1B0 |                       GFN4FR2                         |
*     +-------------------------------------------------------+
* 1B8 |                       GFN4FR1                         |
*     +-------------------------------------------------------+
* 1C0 |                        GFN1FB                         |
*     +-------------------------------------------------------+
* 1C8 |                        GFN1MB                         |
*     +-------------------------------------------------------+
* 1D0 |                        GFN2GB                         |
*     +-------------------------------------------------------+
* 1D8
*
*** SXEWK - Storage Extension Work Area
 
 
  SXEQ Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
GFn            0198
GFnLen         01D0 00000040
GFn1Fb         01C0
GFn1Fp         0198
GFn1Mb         01C8
GFn2Gb         01D0
GFn4Fr         01B8 0GFn4Fr1
GFn4Fr1        01B8
GFn4Fr2        01B0
GFn4Fr3        01A8
GFn4Fs         01A0
SXEfrst        0080 00000090
SXElast        0150 00000190
SXEASCE        0080
SXEEND         0048
SXEGQ          0090
SXEHDNAI       0030
SXEHDND        0020
SXEHDNDF       0028
SXEHDSAI       0010
SXEHDST        0000
SXEHDSTF       0008
SXEMQ          00D0
SXEQhead       0020
SXEQneedC      0038
SXEQneedN      0028
SXEQneedO      0018
SXEQsize       0000
SXEQstill      0008
SXEQtail       0030
SXEQLen        0038 00000040
SXESTART       0040
SXESXSST       0060
SXESXSSZ       0068
SXESZD         01D0 0000003B
SXE1Q          0150
SXE4Q          0110
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:56:43 EDT.
Copyright IBM Corporation, 1990, 2022