Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

DX1BK

Prolog  

Control Block Contents  

DX1BK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

DX1BK Prolog

 NAME       : HCPDX1BK
 DESCRIPTION: Minidisk extent index level 1.
 DSECT      : DX1BK
 FUNCTION   : A DX1BK entry points to a DX2BK which can contain
              up to 128 minidisk extents.
 LOCATED BY : MPEDX1BK  - HCPMPEBK pointer to DX1BK.
 CREATED BY : HCPMSMIP  When a Diagnose 244 is issued by the user.
 DELETED BY : HCPAMD44  During an identify pool function the
              previous DX1BK will be deleted if any.
              HCPMSMDP  During storage reset operation.
 COMMENTS   :
 

DX1BK Control Block Content



DX1BK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DX1BK          Minidisk extent index level 1.
0000    0 Signed       4 DX1HPRBN       Highest PRBN contained in the
                                        second level page.
                                        ****************-------
          00000004       DX1LENET       *-DX1HPRBN Length of this entry.
0004    4 Signed       4 DX1NXTET (511) Next entry in this block.
0800 2048 Address      3 DX1DX2BK       Address of the second level page
                                        which contains up to 128 minidisk
                                        extents. Bits 0-23 are used as an
                                        address. ****************-------
0803 2051 Bitstring    1 DX1PGECT       Count of entries in a DX2BK block
                                        starting with 1. Zero indicates
                                        an empty DX2BK block.
                                        ****************-------
          00000004       DX1LENE2       *-DX1DX2BK Length of this entry.
          1111 1111      DX1CTMSK       X'000000FF' Mask to isolate
                                        count.
          00FFFF00       DX1DX2AM       X'FFFFFF00' Mask to isolate DX2BK
                                        address.
0804 2052 Signed       4 DX1DX2NT (511) Next entry in this block.
          00000200       DX1NUMET       4096/(DX1LENET+DX1LENE2) Number
                                        of entries in the DX1BK.
 

DX1BK Storage Layout

*** DX1BK - Minidisk extent index level 1.
*
*     +---------------------------+---------------------------+
*   0 |         DX1HPRBN          |                           |
*     +---------------------------+                           |
*   8 |                                                       |
*     =                       DX1NXTET                        =
*     |                                                       |
*     +--------------------+------+---------------------------+
* 800 |     DX1DX2BK       |:PGECT|                           |
*     +--------------------+------+                           |
* 808 |                                                       |
*     =                       DX1DX2NT                        =
*     |                                                       |
*     +-------------------------------------------------------+
*1000
*
*** DX1BK - Minidisk extent index level 1.
 

DX1BK Cross Reference

(contains links to field and bit definitions)
Symbol         Dspl Value
-------------- ---- -----

DX1CTMSK       0803 FF

DX1DX2AM       0803 00FFFF00

DX1DX2BK       0800

DX1DX2NT       0804

DX1HPRBN       0000

DX1LENET       0000 00000004

DX1LENE2       0803 00000004

DX1NUMET       0804 00000200

DX1NXTET       0004

DX1PGECT       0803
This information is based on VM/ESA 2.4.0.
Last updated on 3 Aug 1999 at 11:54:04 EDT.
Copyright IBM Corporation, 1990, 1999