ACSBK

Prolog  

Control Block Contents  
   ACSBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

ACSBK Prolog

 Name       : HCPACSBK
 Description: CP Access Block
 DSECT      : ACSBK
 Function   : The ACSBK contains information about each
              mini-disk accessed by CP.
 Located by : ACSPKBK.ACSPKPT(i)
 Created by : HCPZIOC2
 Deleted by : HCPZIOC2
              - HCPZIOL2

ACSBK Control Block Content

ACSBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      ACSBK          CP Access Block
0000    0 Address      4 ACSVDEV        A( VDEV )
0004    4 Address      4 ACSRDEV        A( RDEV )
0008    8 Character    8 ACSUID         Uid that owns the mini-disk
0010   16 Bitstring    2 ACSVADDR       The mini-disk address
0012   18 Signed       2 ACSBLKSZ       Size of blocks on the mini-disk
0014   20 Signed       4 ACSBLKSF       Number of blocks formatted
0018   24 Signed       4 ACSBLKSU       Number of blocks used
001C   28 Address      4 ACSDVTAB       A( dev characteristics in HCPBST)
0020   32 Address      4 ACSOFB         A( chain of OFBKs )
0024   36 Address      4 ACSFSH         A( chain of FSHEADs )
0028   40 Dbl-Word     8 ACSCDS         Label for Compare-Double-and-Swap
0030   48 Signed       4 *              Reserved
0034   52 Address      4 ACSCPEBK       A( CPEBK ), if any
0038   56 Address      4 ACSVMDBK       A( VMDBK ) if mapped to virtual
                                        memory
003C   60 Address      4 ACSBTMAP       A( bit map for virtual memory )
0040   64 Character    6 ACSMDLAB       CMS Label of minidisk
0046   70 Signed       2 *              Reserved for future IBM use
0048   72 Signed       4 ACSSCYL        Real cylinder or block where
                                        mdisk starts
004C   76 Signed       4 ACSECYL        Real cylinder or block where
                                        mdisk ends
          00000050       ACSBSIZB       (*-ACSBK) Size in bytes
          0000000A       ACSBSIZD       (*-ACSBK+7)/8 Size in d-words
0028   40 Signed       2 *              Reserved
002A   42 Bitstring    1 ACSMODE        Disk access mode (DDEVMODE)
002B   43 Bitstring    1 ACSFLAG1       Flags
          .1.. ....      ACSRELSE       X'40' RELEASE issued for this
                                        minidisk
002C   44 Address      4 ACSPOPEN       A( chain of pre-open DRBKs ) End
                                        of CDS area

ACSBK Storage Layout

          
*** ACSBK - CP Access Block
*
*     +---------------------------+---------------------------+
*   0 |         ACSVDEV           |         ACSRDEV           |
*     +---------------------------+---------------------------+
*   8 |                        ACSUID                         |
*     +-------------+-------------+---------------------------+
*  10 |  ACSVADDR   |  ACSBLKSZ   |         ACSBLKSF          |
*     +-------------+-------------+---------------------------+
*  18 |         ACSBLKSU          |         ACSDVTAB          |
*     +---------------------------+---------------------------+
*  20 |          ACSOFB           |          ACSFSH           |
*     +---------------------------+---------------------------+
*  28 |                        ACSCDS                         |
*     +---------------------------+---------------------------+
*  30 |///////////////////////////|         ACSCPEBK          |
*     +---------------------------+---------------------------+
*  38 |         ACSVMDBK          |         ACSBTMAP          |
*     +---------------------------+-------------+-------------+
*  40 |                ACSMDLAB                 |/////////////|
*     +---------------------------+-------------+-------------+
*  48 |         ACSSCYL           |         ACSECYL           |
*     +---------------------------+---------------------------+
*  50
*
*** ACSBK - CP Access Block
          
*** Overlay for ACSCDS in ACSBK
*
*     +-------------+------+------+---------------------------+
*  28 |/////////////|:MODE |:FLAG1|         ACSPOPEN          |
*     +-------------+------+------+---------------------------+
*  30
*
*** Overlay for ACSCDS in ACSBK

ACSBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
ACSBLKSF       0014
ACSBLKSU       0018
ACSBLKSZ       0012
ACSBSIZB       004C 00000050
ACSBSIZD       004C 0000000A
ACSBTMAP       003C
ACSCDS         0028
ACSCPEBK       0034
ACSDVTAB       001C
ACSECYL        004C
ACSFLAG1       002B
ACSFSH         0024
ACSMDLAB       0040
ACSMODE        002A
ACSOFB         0020
ACSPOPEN       002C
ACSRDEV        0004
ACSRELSE       002B 40
ACSSCYL        0048
ACSUID         0008
ACSVADDR       0010
ACSVDEV        0000
ACSVMDBK       0038