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