MSABK Back to Index page
 
Prolog 
Control Block Contents 
   MSABK 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.


  MSABK Prolog Top of page
  
 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 Top of page
  




 MSABK DSECT
Top of page


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 Top of page
  
          
*** MSABK - Map of Slot Allocation
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       MSASLOTS                        =
*     |                                                       |
*     +-------------------------------------------------------+
* 3E8
*
*** MSABK - Map of Slot Allocation
 
 
  MSABK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
MSAMAXSL       0000 00001F40
MSASIZE        0000 0000007D
MSASLOTS       0000
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:52:49 EDT.
Copyright IBM Corporation, 1990, 2022