Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

MSABK

Prolog  

Control Block Contents  
   MSABK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

MSABK Prolog

 NAME       : HCPMSABK
 DESCRIPTION: Map of Slot Allocation
 DSECT      : MSABK
 FUNCTION   : Slot bit map for page or spool EXTBK
 LOCATED BY : EXTSTRCT
 CREATED BY : - HCPPGU when extent is selected for
              allocation.
              - HCPPGT when reallocating spool slots
              during IPL.
              - HCPPGC when extent selected to use as
              Dump space.
 DELETED BY : HCPRDD when a CP-owned device is detached
              from the system.
 REFERENCES :
              HCPEXTBK - Extent block
 SERIALIZED : Page or Spool allocation lock
 RELOCATION CONSIDERATIONS : None
 NOTES      : MSABK represents a maximum of 8000 slots.
 

MSABK Control Block Content

MSABK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      MSABK          Map of Slot Allocation
0000    0 Bitstring 1000 MSASLOTS       Slot bit map...Each bit
                                        represents a slot in the EXTBK.
                                        If bit = 1, slot is in use. If
                                        bit = 0, slot is not in use.
          0000007D       MSASIZE        (*-MSABK+7)/8
          00001F40       MSAMAXSL       8000 Max number of slots per
                                        MSABK
     * end ASM version
 

MSABK Storage Layout

          
*** MSABK - Map of Slot Allocation
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       MSASLOTS                        =
*     |                                                       |
*     +-------------------------------------------------------+
* 3E8
*
*** MSABK - Map of Slot Allocation
 

MSABK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
MSAMAXSL       0000 00001F40
MSASIZE        0000 0000007D
MSASLOTS       0000
This information is based on z/VM V6R2.0. Last updated on 21 Nov 2011 at 11:10:50 EDT.
Copyright IBM Corporation, 1990, 2011