ASATE

Prolog  

Control Block Contents  
   ASATE DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

ASATE Prolog

 NAME       : HCPASATE
 DESCRIPTION: AUXILIARY STORAGE ADDRESS TABLE ENTRY
 DSECT      : ASATE
 FUNCTION   : THE ASATE CONTAINS THE AUXILIARY STORAGE ADDRESS
              OF A 4K VIRTUAL PAGE IF A COPY RESIDES ON
              AUXILIARY PAGING STORAGE
 LOCATED BY : PGMASATB  FIELD OF HCPPGMBK + (PAGE OFFSET * 4)
              VPGASATE IN A VPGBK USING A PAGTE ADDRESS
              AN AUXILIARY STORAGE ADDRESS TABLE RESIDES IN A
              PAGE MANAGEMENT BLOCK ASSOCIATED WITH A MEGABYTE
              OF VIRTUAL STORAGE AND IS POINTED TO BY PGMASATB.
              THERE ARE 256 CONTIGUOUS AUXILIARY STORAGE ADDRESS
              ENTRIES (ASATE'S) CONTAINED IN THE PGMASATB.
              ANY SPECIFIC ASA TABLE ENTRY CAN BE OBTAINED BY
              EXTRACTING THE PAGE NUMBER (BITS 12-19) FROM A
              VIRTUAL ADDRESS MULTIPLYING THE PAGE NUMBER TIMES 4
              AND ADDING THE OFFSET OBTAINED TO PGMASATB.
              ALSO, USING THE ADDRESS OF A PAGTE AS THE ADDRESS
              OF A VPGBK THE CORRESPONDING ASATE CAN BE FOUND
              BY ADDRESSING FIELD VPGASATE IN THE VPGBK.
 CREATED BY : HCPBPBCU
              HCPBPBIE
              HCPBPBIM
              HCPBPBSL
              and their clones.
              AN AUXILIARY STORAGE ADDRESS TABLE IS IMBEDDED
              IN A PAGE MANAGEMENT BLOCK AND CONSEQUENTLY
              SPACE IS CREATED FOR THE ASATE WHEN THE PGMBK
              IS CREATED.
              AT INITIALIZATION TIME HCPISTOR FILLS IN THE ASATE
              FOR CP RESIDENT PAGES, CP PAGABLE PAGES AND
              CHECKPOINT PAGES.
              AFTER INITIALIZATION HCPPTVAA FILLS IN EACH ASATE
              WHEN IT IS ASSIGNED.
 DELETED BY : HCPRCIRL
              HCPRPBPA
              HCPRPBPS
              HCPRPBRM
              HCPRPBSL
              and their clones.
              AN AUXILIARY STORAGE ADDRESS TABLE IS DELETED WHEN
              A PAGE MANAGEMENT BLOCK IS RELEASED.

ASATE Control Block Content

ASATE DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      ASATE          AUXILIARY STORAGE ADDRESS TABLE
                                        ENTRY
0000    0 Signed       4 ASAENTRY       AUXILIARY STORAGE ADDRESS
          00000004       ASALENTH       *-ASAENTRY LENGTH OF ONE ADDRESS
                                        TABLE ENTRY
0004    4 Signed       4 ASANEXT (0)    NEXT ADDRESS TABLE ENTRY
0000    0 Signed       2 ASACNUM        AUXILIARY STORAGE CYLINDER NUMBER
0002    2 Bitstring    1 ASAPNUM        AUXILIARY STORAGE PAGE NUMBER
0003    3 Bitstring    1 ASAVOL         AUXILIARY STORAGE VOLUME CODE
     *

ASATE Storage Layout

          
*** ASATE - AUXILIARY STORAGE ADDRESS TABLE ENTRY
*
*     +---------------------------+
*   0 |         ASAENTRY          |
*     +---------------------------+
*
*** ASATE - AUXILIARY STORAGE ADDRESS TABLE ENTRY
          
*** Overlay for ASAENTRY in ASATE
*
*     +-------------+------+------+
*   0 |  ASACNUM    |:PNUM |ASAVOL| 4
*     +-------------+------+------+
*
*** Overlay for ASAENTRY in ASATE

ASATE Cross Reference

Symbol         Dspl Value
-------------- ---- -----
ASACNUM        0000
ASAENTRY       0000
ASALENTH       0000 00000004
ASANEXT        0004
ASAPNUM        0002
ASAVOL         0003