LDVBK

Prolog  

Control Block Contents  
   LDVBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

LDVBK Prolog

 NAME       : HCPLDVBK
 DESCRIPTION: ISFC Link Device Extension
 DSECT      : LDVBK
 FUNCTION   : This block is used to maintain status information
              for a single physical link device.  The LNKBK contains
              a table pointing to all active LDVBK blocks.
 LOCATED BY : LNKDEVTB  (array of pointers).  LNKDEVCT contains the
              number of active devices, and LNKDEVMX is
              equated to the maximum number that one link
              can support.
              RDEVCFDV  (pointer).
 CREATED BY : Operation of the 'ACTIVATE ISLINK' command.
 DELETED BY : Operation of the 'DEACTIVE ISLINK' command.
 SERIALIZED : The associated LNKBK lock (LNKLKWRD) must be held in
              order to update the LNKBK (in general).  Some fields
              are associated with I/O and are serialized by the
              associated RDEV lock instead.

LDVBK Control Block Content

LDVBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LDVBK          ISFC Link Device Extension
      Device identification and linkage.
0000    0 Character    4 LDVDEVID       Printable hex device number
0004    4 Signed       4 LDVDEVNO       Real device address
0008    8 Address      4 LDVLNKBK       Base LNKBK addr (Hold RDEV lock)
000C   12 Signed       4 LDVDEVIX       Link Device Index (0..n)
0010   16 Address      4 LDVRDEV        RDEV address
0014   20 Address      4 LDVEXTBK       Line Driver extension address
      Device status.
0018   24 Bitstring    1 LDVDVFLG       Device Flag
          1... ....      LDVDVATT       X'80' LDVDVATT - This device is
                                        ATTACHED
          .1.. ....      LDVDVAPL       X'40' LDVDVAPL - Attach Process
                                        lock is held
          ..1. ....      LDVDVLCK       X'20' LDVDVLCK - RDEV lock is
                                        held
0019   25 Bitstring    1 LDVIOPND       I/O Pending Status
          1... ....      LDVSIOPD       X'80' LDVSIOPD - Start Pending
          .1.. ....      LDVINTPD       X'40' LDVINTPD - Interrupt
                                        Pending
001A   26 Bitstring    6 *              Reserved
      Low level I/O activity.
0020   32 Address      4 LDVIORBK       IORBK for outgoing I/O
0024   36 Address      4 LDVIORRF       IORBK for interrupt reflection
0028   40 Signed       4 LDVUPARM       Latest ORB User PARM value
002C   44 Bitstring    4 *              Reserved
      Work area for use by the interrupt handler.
      Notes      :
        This area is serialized by the RDEV lock.
0030   48 Dbl-Word     8 LDVIWRK (0)    Space for LDVIWRK0-LDVIWRK9
0030   48 Signed       4 LDVIWRK0       Work area
0034   52 Signed       4 LDVIWRK1       Work area
0038   56 Signed       4 LDVIWRK2       Work area
003C   60 Signed       4 LDVIWRK3       Work area
0040   64 Signed       4 LDVIWRK4       Work area
0044   68 Signed       4 LDVIWRK5       Work area
0048   72 Signed       4 LDVIWRK6       Work area
004C   76 Signed       4 LDVIWRK7       Work area
0050   80 Signed       4 LDVIWRK8       Work area
0054   84 Signed       4 LDVIWRK9       Work area
          0000000B       LDVSIZE        (*-LDVBK+7)/8 Size, in
                                        doublewords, of LDVBK

LDVBK Storage Layout

          
*** LDVBK - ISFC Link Device Extension
*
*     +---------------------------+---------------------------+
*   0 |         LDVDEVID          |         LDVDEVNO          |
*     +---------------------------+---------------------------+
*   8 |         LDVLNKBK          |         LDVDEVIX          |
*     +---------------------------+---------------------------+
*  10 |         LDVRDEV           |         LDVEXTBK          |
*     +------+------+-------------+---------------------------+
*  18 |:DVFLG|:IOPND|/////////////////////////////////////////|
*     +------+------+-------------+---------------------------+
*  20 |         LDVIORBK          |         LDVIORRF          |
*     +---------------------------+---------------------------+
*  28 |         LDVUPARM          |///////////////////////////|
*     +---------------------------+---------------------------+
*  30 |         LDVIWRK0          |         LDVIWRK1          |
*     +---------------------------+---------------------------+
*  38 |         LDVIWRK2          |         LDVIWRK3          |
*     +---------------------------+---------------------------+
*  40 |         LDVIWRK4          |         LDVIWRK5          |
*     +---------------------------+---------------------------+
*  48 |         LDVIWRK6          |         LDVIWRK7          |
*     +---------------------------+---------------------------+
*  50 |         LDVIWRK8          |         LDVIWRK9          |
*     +---------------------------+---------------------------+
*  58
*
*** LDVBK - ISFC Link Device Extension

LDVBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
LDVDEVID       0000
LDVDEVIX       000C
LDVDEVNO       0004
LDVDVAPL       0018 40
LDVDVATT       0018 80
LDVDVFLG       0018
LDVDVLCK       0018 20
LDVEXTBK       0014
LDVINTPD       0019 40
LDVIOPND       0019
LDVIORBK       0020
LDVIORRF       0024
LDVIWRK        0030
LDVIWRK0       0030
LDVIWRK1       0034
LDVIWRK2       0038
LDVIWRK3       003C
LDVIWRK4       0040
LDVIWRK5       0044
LDVIWRK6       0048
LDVIWRK7       004C
LDVIWRK8       0050
LDVIWRK9       0054
LDVLNKBK       0008
LDVRDEV        0010
LDVSIOPD       0019 80
LDVSIZE        0054 0000000B
LDVUPARM       0028