TPCBK

Prolog  

Control Block Contents  
   TPCBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

TPCBK Prolog

 NAME       : HCPTPCBK
 DESCRIPTION: TAPE PATHING CONTROL BLOCK
 DSECT      : TPCBK
 FUNCTION   : CONTAINS TAPE PATHING INFORMATION
 LOCATED BY : VDEVDYPT IN VIRTUAL DEVICE BLOCK
 CREATED BY : HCPVDSAT (DURING ATTACH OR DEDICATE PROC)
 DELETED BY : HCPDTDEV (DURING DETACH COMMAND PROCESSING)
 SERIALIZED : BEING ACCESSED FOR A UNIQUE TASK

TPCBK Control Block Content

TPCBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      TPCBK          TAPE PATHING CONTROL BLOCK
0000    0 Bitstring   12 TPCBLOCK (8)   EIGHT ENTRIES OF PATHING
                                        INFORMATION
          0000000C       TPCSIZE        (*-TPCBK+7)/8 TPCBK SIZE IN
                                        DOUBLE WORDS
0000    0 Bitstring   12 TPCENTRY (0)   ONE ENTRY OF TAPE PATHING BLOCK
0000    0 Bitstring   11 TPCGROUP       TAPE PATH GROUP ID
000B   11 Bitstring    1 TPCFLAGS       TAPE PATHING FLAGS
          1... ....      TPCFGRP        X'80' PATH IS GROUPED
          0000000C       TPCNXTEN       *-TPCENTRY

TPCBK Storage Layout

          
*** TPCBK - TAPE PATHING CONTROL BLOCK
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       TPCBLOCK                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  60
*
*** TPCBK - TAPE PATHING CONTROL BLOCK
          
*** Overlay for TPCBLOCK in TPCBK
*
*     +-------------------------------------------------------+
*   0 |                       TPCGROUP                        |
*     |                    +------+---------------------------+
*   8 |                    |:FLAGS| C
*     +--------------------+------+
*
*** Overlay for TPCBLOCK in TPCBK

TPCBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
TPCBLOCK       0000
TPCENTRY       0000
TPCFGRP        000B 80
TPCFLAGS       000B
TPCGROUP       0000
TPCNXTEN       000B 0000000C
TPCSIZE        0000 0000000C