SXEWK Back to Index page
 
Prolog 
Control Block Contents 
   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.


  SXEWK Prolog Top of page
 
 NAME       : HCPSXEWK
 DESCRIPTION: Storage Extension Work Area
 DSECT      : SXEWK
 FUNCTION   : Contain information about a central storage
              extension
 CREATED BY : HCPPCQ
 DELETED BY : HCPPCQ
 LOCATED BY : SVGSXEWK in HCPPCQ
 SERIALIZED : SYSDSRLK
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : If the extension request can be completed within the
              unused area triggered by the IPL parameter STOR= being
              less than the configured storage size, then no hardware
              SERVC attach and assign operations will be needed.
              SXEHDST will be zero in order to indicate this case.
              If the extension request cannot be completed within the
              unused area triggered by the IPL parameter STOR= being
              less than the configured storage size, then hardware
              SERVC attach and assign operations will be needed.  In
              this case, SXEHDST and SXEHDND will indicate the host
              absolute addresses to be processed.
              If SXEHDST and SXEHDND are non-zero, then the ending
              storage location, for hardware operations and for CP,
              will be SXEEND.
              In this case, SXEEND and SXEHDND must be the same.
              In any case, the addresses that CP will use for its
              control blocks and other normal use will be indicated
              by SXESTART and SXEEND.
 
 
  SXEWK Control Block Content Top of page
 

 SXEWK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SXEWK Storage Extension Work Area Start and end of the extension that will be attached and assigned by SERVC hardware requests. 0000 0 Address 8 SXEHDST Storage extension start address 0008 8 Address 8 SXEHDND Storage extension end address 0010 16 Address 8 SXEHDSTF FRMTE address for SXEHDST 0018 24 Address 8 SXEHDNDF FRMTE address for SXEHDND-1 Description of the extension that CP will use. 0020 32 Address 8 SXESTART Storage extension start address 0028 40 Address 8 SXEEND Storage extension end address 0030 48 Signed 8 SXEFTFS Frame Table Frames Size 0038 56 Signed 8 SXEFTPTS Frame Table Page Table Frames size 0040 64 Signed 8 SXESPMTS SPMT Frames Size 0048 72 Signed 8 SXESXSTS SXSTB Page Table Frames Size nof bytes to hold the add'l SXSTEs 0050 80 Signed 8 SXESXSS SXS Extension Size bytes nof bytes to increase SXS 0058 88 Signed 8 SXESTSIZ SXS growth usable size 0060 96 Signed 8 * Reserved for IBM use 0068 104 Signed 8 SXE4Q Count of quad sets used Intended simply for debugging 0070 112 Signed 8 SXE1Q Count of singles used Intended simply for debugging 0078 120 Address 8 SXEAvlZn Chain of available AvlZns terminated by pointer of zero 0080 128 Address 4 SXEFTXBK Chain of available FTXBKs terminated by pointer of zero 0084 132 Address 4 SXERSMBK A(DMU work RSMBK) 00000011 SXESZD (*-SXEWK+7)/8 SXEWK size in dwords
 
 
  SXEWK Storage Layout Top of page
 
          
*** SXEWK - Storage Extension Work Area
*
*     +-------------------------------------------------------+
*   0 |                       SXEHDST                         |
*     +-------------------------------------------------------+
*   8 |                       SXEHDND                         |
*     +-------------------------------------------------------+
*  10 |                       SXEHDSTF                        |
*     +-------------------------------------------------------+
*  18 |                       SXEHDNDF                        |
*     +-------------------------------------------------------+
*  20 |                       SXESTART                        |
*     +-------------------------------------------------------+
*  28 |                        SXEEND                         |
*     +-------------------------------------------------------+
*  30 |                       SXEFTFS                         |
*     +-------------------------------------------------------+
*  38 |                       SXEFTPTS                        |
*     +-------------------------------------------------------+
*  40 |                       SXESPMTS                        |
*     +-------------------------------------------------------+
*  48 |                       SXESXSTS                        |
*     +-------------------------------------------------------+
*  50 |                       SXESXSS                         |
*     +-------------------------------------------------------+
*  58 |                       SXESTSIZ                        |
*     +-------------------------------------------------------+
*  60 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  68 |                        SXE4Q                          |
*     +-------------------------------------------------------+
*  70 |                        SXE1Q                          |
*     +-------------------------------------------------------+
*  78 |                       SXEAVLZN                        |
*     +---------------------------+---------------------------+
*  80 |         SXEFTXBK          |         SXERSMBK          |
*     +---------------------------+---------------------------+
*  88
*
*** SXEWK - Storage Extension Work Area
 
 
  SXEWK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
SXEAvlZn       0078
SXEEND         0028
SXEFTFS        0030
SXEFTPTS       0038
SXEFTXBK       0080
SXEHDND        0008
SXEHDNDF       0018
SXEHDST        0000
SXEHDSTF       0010
SXERSMBK       0084
SXESPMTS       0040
SXESTART       0020
SXESTSIZ       0058
SXESXSS        0050
SXESXSTS       0048
SXESZD         0084 00000011
SXE1Q          0070
SXE4Q          0068
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:30:57 EDT.
Copyright IBM Corporation, 1990, 2020