CACHBLOK Back to Index page
 
Prolog 
Control Block Contents 
   CACHBLOK DSECT
   CACENT 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.

 
  CACHBLOK Control Block Content Top of page
  




 CACHBLOK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CACHBLOK
     **   US GOVERNMENT USERS RESTRICTED RIGHTS -
     **   USE, DUPLICATION OR DISCLOSURE
     **   RESTRICTED BY GSA ADP SCHEDULE CONTRACT WITH
     **   IBM CORPORATION.
     ** STATUS     :  RACF Feature for z/VM Version 7, Release 5.0
     01* HISTORY    :
      $L0= MACACHE JRF1922 920301 PDBRW1 : Original code               @L0A
     01* CHANGE DESCRIPTIONS:
     **                CACHBLOK  -  CACHE HEADER BLOCK
                   +***************--+-----+***************--------+
               0   | EYECATCHER:"MAC"| C*1 |        CACHLOCK       |
                   +***************--+-----+***************--------+
               8   |        CACHFLAN       |        CACHULAN       |
                   +***************--------+***************--------+
     **                CACHBLOK  -  CACHE HEADER BLOCK
0000    0 Dbl-Word     8 * (0)
0000    0 Bitstring    1 * (3)          "MAC" - this eyecatcher may be
                                        removed if more space is needed
0003    3 Bitstring    1 CACHSTAT       C*1 CACH ACTIVE/INACTIVE STATUS
          1... ....      CACHACT        X'80' CACHACT CACHE ACTIVE
0004    4 Signed       4 CACHLOCK       CACHE LOCKWORD
0008    8 Signed       4 CACHFLAN       ADDRESS OF FREE LIST
000C   12 Signed       4 CACHULAN       ADDRESS OF USED LIST
          00000010       CACHLEN        *-CACHBLOK LENGTH OF CACHE HEADER




 CACENT DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CACENT
     **              CACENT  -  CACHE ENTRIES
                   +***************--------+-----+***************--+
               0   |        CACENEXT       | C*2 | /////////////// |
                   +***************--------+-----+***************--+
               8   |                    CACESUBJ                   |
                   +*********************************************--+
              10   |                    CACEOBJ                    |
                   +*********************************************--+
     **              CACENT  -  CACHE ENTRIES
0000    0 Signed       4 CACENEXT       ADDRESS OF NEXT CACHE ENTRY
0004    4 Bitstring    1 CACESECR       C*2 RELATIONSHIP BETWEEN SECLABEL
                                        VALUES
          1... ....      CACEEQ         X'80' CACEEQ EQUAL
          .1.. ....      CACENE         X'40' CACENE NOT EQUAL
                                        (INCOMPARABLE)
          ..1. ....      CACESD         X'20' CACESD SUBJECT DOMINENT
          ...1 ....      CACEOD         X'10' CACEOD OBJECT DOMINENT
0005    5 Bitstring    1 * (3)          RESERVED
0008    8 Dbl-Word     8 CACESUBJ       CACHE SUBJECT
0010   16 Dbl-Word     8 CACEOBJ        CACHE OBJECT
          00000018       CACELEN        *-CACENT LENGTH OF CACHE ENTRY
 
 
  CACHBLOK Storage Layout Top of page
  
          
*** CACHBLOK - Control Block in CACHBLOK
*
*     +--------------------+------+---------------------------+
*   0 |////////////////////|:HSTAT|         CACHLOCK          |
*     +--------------------+------+---------------------------+
*   8 |         CACHFLAN          |         CACHULAN          |
*     +---------------------------+---------------------------+
*  10
*
*** CACHBLOK - Control Block in CACHBLOK
          
*** CACENT - Control Block in CACHBLOK
*
*     +---------------------------+------+--------------------+
*   0 |         CACENEXT          |:ESECR|////////////////////|
*     +---------------------------+------+--------------------+
*   8 |                       CACESUBJ                        |
*     +-------------------------------------------------------+
*  10 |                       CACEOBJ                         |
*     +-------------------------------------------------------+
*  18
*
*** CACENT - Control Block in CACHBLOK
 
 
  CACHBLOK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
CACEEQ         0004 80
CACELEN        0010 00000018
CACENE         0004 40
CACENEXT       0000
CACEOBJ        0010
CACEOD         0004 10
CACESD         0004 20
CACESECR       0004
CACESUBJ       0008
CACHACT        0003 80
CACHFLAN       0008
CACHLEN        000C 00000010
CACHLOCK       0004
CACHSTAT       0003
CACHULAN       000C
 
This information is based on z/VM 7.5.0 Last updated on 22 Jun 2026 at 11:10:47 EDT.
Copyright IBM Corporation, 1990, 2026