VLDPG Back to Index page
 
Prolog 
Control Block Contents 
   VLDPG DSECT
   VLDBK DSECT
   VLDSEG 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.

 
  VLDPG Control Block Content Top of page
  




 VLDPG DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VLDPG          VLAN Definition Block
0000    0 Bitstring    1 VLDPGHDR (0)   VLDPG Header
0000    0 Character    8 VLDPGID        Eye-catcher (CL8'HCPVLDBK')
0008    8 Bitstring    4 VLDPGNXT       Next page DASD ASA
000C   12 Signed       2 VLDPGAVL       Next available byte (offset)
000E   14 Bitstring    2 *              Reserved for IBM use
          00000010       VLDPGHLN       *-VLDPGHDR Length of VLDPG header
0010   16 Bitstring    1 VLDPGDAT (0)   Space for page data
      VLDBK - VLAN Device Extension.




 VLDBK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VLDBK          VLAN Definition Block
0000    0 Bitstring    1 VLDHDR (0)     VLAN Extension Header
0000    0 Signed       2 VLDVSEG        Offset to VLDSEG (VLDHDRLN)
0002    2 Signed       2 VLDLEN         Length of VLDBK (total)
0004    4 Character    8 VLDUSER        Userid/Profile
000C   12 Signed       2 VLDVDEV        Virtual Device Number
000E   14 Signed       2 VLDVIDCT       Total VLAN ID count
0010   16 Signed       2 VLDSEGCT       Total segments defined
0012   18 Signed       2 VLDSEGBL       VLDSEG length (in bytes)
0014   20 Signed       4 * (0)          Note fullword alignment
          00000014       VLDHDRLN       *-VLDHDR Length of VLDBK header
0014   20 Bitstring    1 VLDSPEC (16)   Space for VID segments
          000001A4       VLDBKLN        (*-VLDBK) VLDBK size (max) in
                                        bytes
          00000035       VLDBKSZ        (VLDBKLN+7)/8 VLDBK size (max) in
                                        doublewords
      VLDSEG - One VLAN segment (nnnn-mmmm).




 VLDSEG DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VLDSEG         VLAN Definition Block
0000    0 Signed       2 VLDLOW         Low end of a range
0002    2 Signed       2 VLDHIGH        High end of a range
          00000004       VLDSEGLN       *-VLDSEG Length of one VID
                                        segment
      Associated definitions.
        VLDSGMAX = the maximum number of VLDSEG entries
                   allowed.
        VLDSGLIM = the total length of a VLDBK with the
                   maximum number of segments (VLDSGMAX).
      NOTES      :
        VLDSGLIM must be able to fit within VLDPGDAT on
        disk, and the maximum size of a free storage block
        when the VLDBK is in memory.
          00000064       VLDSGMAX       100 Maximum segment counts
          000001A4       VLDSGLIM       (VLDHDRLN+(VLDSGMAX*VLDSEGLN))
                                        Max VLDBK length
 
 
  VLDPG Storage Layout Top of page
  
          
*** VLDPG - VLAN Definition Block
*
*     +-------------------------------------------------------+
*   0 |                       VLDPGID                         |
*     +---------------------------+-------------+-------------+
*   8 |         VLDPGNXT          |  VLDPGAVL   |/////////////|
*     +---------------------------+-------------+-------------+
*
*** VLDPG - VLAN Definition Block
          
*** VLDBK - VLAN Definition Block
*
*     +-------------+-------------+---------------------------+
*   0 |  VLDVSEG    |   VLDLEN    |         VLDUSER-          |
*     +-------------+-------------+-------------+-------------+
*   8 |          -(004)           |  VLDVDEV    |  VLDVIDCT   |
*     +-------------+-------------+-------------+-------------+
*  10 |  VLDSEGCT   |  VLDSEGBL   |                           |
*     +-------------+-------------+                           |
*     |                       VLDSPEC                         |
*     |                           +---------------------------+
*     |                           | 24
*     +---------------------------+
*
*** VLDBK - VLAN Definition Block
          
*** VLDSEG - VLAN Definition Block
*
*     +-------------+-------------+
*   0 |   VLDLOW    |  VLDHIGH    | 4
*     +-------------+-------------+
*
*** VLDSEG - VLAN Definition Block
 
 
  VLDPG Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
VLDBKLN        0014 000001A4
VLDBKSZ        0014 00000035
VLDHDR         0000
VLDHDRLN       0014 00000014
VLDHIGH        0002
VLDLEN         0002
VLDLOW         0000
VLDPGAVL       000C
VLDPGDAT       0010
VLDPGHDR       0000
VLDPGHLN       000E 00000010
VLDPGID        0000
VLDPGNXT       0008
VLDSEGBL       0012
VLDSEGCT       0010
VLDSEGLN       0002 00000004
VLDSGLIM       0002 000001A4
VLDSGMAX       0002 00000064
VLDSPEC        0014
VLDUSER        0004
VLDVDEV        000C
VLDVIDCT       000E
VLDVSEG        0000
 
This information is based on z/VM 7.1.0 Last updated on 22 Jun 2018 at 11:53:49 EDT.
Copyright IBM Corporation, 1990, 2018