ZLXBK Back to Index page
 
Prolog 
Control Block Contents 
   ZLXBK 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.


  ZLXBK Prolog Top of page
  
 NAME       : HCPZLXBK
 DESCRIPTION: LOGO FILE EXTENSION BLOCK
 DSECT      : ZLXBK
 FUNCTION   : Mapping for logo extension area.  Each ZLXBK will
              represent slightly less than a page of storage.
              Contained within the ZLXVARS field will be ZLEBKs
              that are chained in a linked list.
 LOCATED BY : HCPBOZ
 CREATED BY : HCPBOZ   as part of reading logo configuration
              file triggered at system IPL or by a
              REFRESH LOGOINFO command.
 DELETED BY : HCPBOZ if replaced as part of REFRESH LOGO
 RELOCATION CONSIDERATIONS : None
 
 
  ZLXBK Control Block Content Top of page
  




 ZLXBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      ZLXBK          LOGO FILE EXTENSION BLOCK
0000    0 Signed       4 ZLXNXTEX       Pointer to next extension block
0004    4 Signed       4 ZLXEND         Address of 'end of block'
0008    8 Signed       4 ZLXVARS (0)    List entry portion of table
          00000008       ZLXHLEN        *-ZLXBK Header length
          00000054       ZLXVCNT        (4072-ZLXHLEN)/ZLELEN number of
                                        entries in extension
          00000FC8       ZLXENDBK       ZLXHLEN+(ZLXVCNT*ZLELEN) Size in
                                        bytes
          000001F9       ZLXSIZED       (ZLXENDBK+7)/8 Size in double
                                        words
      This command_line block contains:
        1) Header information:
             a) address of next command_line block (if any)
             b) address of the end of block
        2) a contiguous list of command_line entries
           Notes      : a command_line entry cannot span blocks
0000    0 Signed       4 ZLXNXTCB       Pointer to next command_line
                                        block
0004    4 Signed       4 ZLXCBEND       Address of 'end of block'
0008    8 Signed       4 ZLXCMDS (0)    command_line data portion
          00000000       ZLXCHLEN       *-ZLXTXT Header length
          00000FC8       ZLXBYTSZ       ZLXENDBK Size in bytes
 
 
  ZLXBK Storage Layout Top of page
  
          
*** ZLXBK - LOGO FILE EXTENSION BLOCK
*
*     +---------------------------+---------------------------+
*   0 |         ZLXNXTEX          |          ZLXEND           |
*     +---------------------------+---------------------------+
*
*** ZLXBK - LOGO FILE EXTENSION BLOCK
          
*** Overlay for ORG in ZLXBK
*
*     +---------------------------+---------------------------+
*   0 |         ZLXNXTCB          |         ZLXCBEND          |
*     +---------------------------+---------------------------+
*
*** Overlay for ORG in ZLXBK
 
 
  ZLXBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
ZLXBYTSZ       0008 00000FC8
ZLXCBEND       0004
ZLXCHLEN       0008 00000000
ZLXCMDS        0008
ZLXEND         0004
ZLXENDBK       0008 00000FC8
ZLXHLEN        0008 00000008
ZLXNXTCB       0000
ZLXNXTEX       0000
ZLXSIZED       0008 000001F9
ZLXVARS        0008
ZLXVCNT        0008 00000054
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:58:20 EDT.
Copyright IBM Corporation, 1990, 2022