Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

LDDBK

Prolog  

Control Block Contents  
   LDDBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  


LDDBK Prolog

 NAME       : HCPLDDBK
 DESCRIPTION: LOGICAL DISPLAY DEVICE SIMULATION BLOCK
 DSECT      : LDDBK
 FUNCTION   : THE LDDBK IS USED TO MAINTAIN INFORMATION NEEDED
              TO EFFECTIVELY SIMULATE LOGICAL 327X AND 328X DEVICES.
              THE DATA STRUCTURE THAT THESE BLOCKS RESIDE IN IS
              MAINTAINED IN THE MODULE HCPLDA, AND THESE BLOCKS
              ARE ONLY AVAILABLE VIA CALL TO THAT MODULE.
              SEE HCPLDA FOR DETAILS.
 LOCATED BY : HCPLDAFE
 CREATED BY : HCPLDACR
 DELETED BY : HCPLDADD
 RELOCATION CONSIDERATIONS : None

 

LDDBK Control Block Content


LDDBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LDDBK          LOGICAL DISPLAY DEVICE SIMULATION BLOCK
0000    0 Dbl-Word     8 LDDBKID (0)    BLOCK IDENTIFIER
0000    0 Character    5 LDDNAME        BLOCK NAME 'LDDBK'
0005    5 Bitstring    1 LDDVERS        BLOCK VERSION NUMBER
          00000001       LDDCURVR       LDDMAR1 LDDCURVR CURRENT VERSION
                                        OF THE LDDBK
          00000001       LDDMAR1        X'01' LDDMAR1 VM/XA MA RELEASE 1
0006    6 Signed       2 LDDLDNUM       LOGICAL DEVICE NUMBER
0008    8 Signed       4 LDDBUFAD       PENDING DATA BUFFER ADDRESS
000C   12 Signed       4 LDDSUSP        CPEBK ADDRESS FOR SUSPENDED TASK
0010   16 Signed       4 LDDCOUNT       PENDING CCW DATA COUNT
0014   20 Bitstring    1 LDDCRCW        CURRENT CCW OPCODE
0015   21 Bitstring    1 LDDSENSE       SENSE INFORMATION
0016   22 Bitstring    1 LDDUSTTS       UNIT STATUS INFORMATION
0017   23 Bitstring    1 LDDEXTCD       EXTERNAL INTERRUPT CODE TO
                                        REFLECT TO HOST MACHINE
          00000001       LDDKILLD       X'01' LDDKILLD CP HAS TERMINATED
                                        THIS DEVICE
          00000002       LDDWRT         X'02' LDDWRT A WRITE WAS ISSUED
                                        TO THIS DEVICE
          00000003       LDDNTFY        X'03' LDDNTFY A PREVIOUS PRESENT
                                        IS NOW COMPLETE
          00000004       LDDRDBUF       X'04' LDDRDBUF READ-BUFFER ISSUED
                                        TO THIS DEVICE
          00000005       LDDRDMOD       X'05' LDDRDMOD READ-MODIFIED
                                        ISSUED TO THIS DEVIC
0018   24 Bitstring    1 LDDWTNG        FUNCTION WE ARE WAITING FOR
          1... ....      LDDACCWT       X'80' LDDACCWT ACCEPT - WRITE CCW
                                        PENDING
          .1.. ....      LDDPRBWT       X'40' LDDPRBWT PRESENT -
                                        READ-BUFFER PENDING
          ..1. ....      LDDPRMWT       X'20' LDDPRMWT PRESENT -
                                        READ-MODIFIED PENDING
          ...1 ....      LDDSTAWT       X'10' LDDSTAWT WAITING FOR STATUS
                                        DIAGNOSE
          .... 1...      LDDWACWT       X'08' LDDWACWT IN WRITE/ACCEPT
                                        CHAIN - DON'T MOVE CCW INTO DATA
                                        BUFFER
          .... .1..      LDDPREXT       X'04' LDDPREXT PRESENT IN
                                        PROGRESS - REFLECT INTERRUPT CODE
                                        3 ON COMPLETION
0019   25 Bitstring    1 LDDCURPR       CURRENT PROCESSING FLAGS
          1... ....      LDDPRES        X'80' LDDPRES PRESENT IN PROGRESS
          .1.. ....      LDDACCPT       X'40' LDDACCPT ACCEPT IN PROGRESS
          ..1. ....      LDDEXTRN       X'20' LDDEXTRN External interrupt
                                        being reflected (not reason code
                                        3)
          ...1 ....      LDDMVPTL       X'10' LDDMVPTL MOVE PARTIAL DATA
                                        ON ACCEPT
          .... 1...      LDDPRDBU       X'08' LDDPRDBU PRESENT of read
                                        buffer data
          .... .1..      LDDEXT3        X'04' LDDEXT3 External interrupt
                                        reason code 3 being reflected
001A   26 Bitstring    1 LDDSCHAR       SPECIAL DEVICE CHARACTERISTICS
          1... ....      LDDACCST       X'80' LDDACCST STATUS MUST FOLLOW
                                        ACCEPT FUNCTION
          .1.. ....      LDDEXTFT       X'40' LDDEXTFT EXTENDED FEATURES
                                        SUPPORTED
          ..1. ....      LDDNOEWA       X'20' LDDNOEWA Erase/Write
                                        Alternate NOT supported
          ...1 ....      LDDDEVID       X'10' LDDDEVID Device identifier
                                        provided
          .... 1...      LDDDEVIP       X'08' LDDDEVIP Device identifier
                                        pointer provided
001B   27 Bitstring    1 LDDSTATS       MISCELLANEOUS STATUS
          1... ....      LDDPURGE       X'80' LDDPURGE PRESENT DATA
                                        BUFFER WAS PURGED
          .1.. ....      LDDCPBUF       X'40' LDDCPBUF BUFFER AT LDDBUFAD
                                        IS IN CP STORAGE.
          ..1. ....      LDDLERR        X'20' LDDLERR ERROR DETECTED
                                        DURING LIST FORM PRESENT
          ...1 ....      LDDDEAD        X'10' LDDDEAD LOGICAL DEVICE IS
                                        DECEASED
          .... 1...      LDDBUFPG       X'08' LDDBUFPG Buffer at LDDBUFAD
                                        is a page and was obtained via
                                        HCPPTFGF
          .... .1..      LDDSELR        X'04' LDDSELR SELECTIVE RESET HAS
                                        BEEN DONE ON THIS LDDBK.
          .... ..1.      LDDNTYDN       X'02' LDDNTYDN PRESENT LIST
                                        FORMAT EXT INT DONE
          .... ...1      LDDHVM24       X'01' LDDHVM24 HVM addressing
                                        mode is 24 bit
001C   28 Signed       4 LDDBUFL        PENDING DATA BUFFER LENGTH -
                                        BYTES
0020   32 Signed       4 LDDPARNT       VMDBK ADDRESS OF THE VIRTUAL
                                        MACHINE THAT CREATED THE LOGICAL
                                        DEVICE
0024   36 Signed       4 LDDFPNTR       FORWARD POINTER TO NEXT LDDBK
0028   40 Signed       4 LDDBPNTR       BACK POINTER TO PREVIOUS LDDBK
002C   44 Signed       4 LDDRDEV        ADDRESS OF RDEV FOR LOGICAL
                                        DEVICE
0030   48 Dbl-Word     8 LDDLOCK (3)    LDDBK LOCK SEMAPHORE
0048   72 Bitstring   16 LDDIDENT       Logical device identifier
          0000000B       LDDSIZE        (*-LDDBK+7)/8 SIZE OF LDDBK IN
                                        DOUBLEWORDS

 

LDDBK Storage Layout

          
*** LDDBK - LOGICAL DISPLAY DEVICE SIMULATION BLOCK
*
*     +----------------------------------+------+-------------+
*   0 |             LDDNAME              |:VERS |  LDDLDNUM   |
*     +---------------------------+------+------+-------------+
*   8 |         LDDBUFAD          |         LDDSUSP           |
*     +---------------------------+------+------+------+------+
*  10 |         LDDCOUNT          |:CRCW |:SENSE|:USTTS|:EXTCD|
*     +------+------+------+------+------+------+------+------+
*  18 |:WTNG |:CURPR|:SCHAR|:STATS|         LDDBUFL           |
*     +------+------+------+------+---------------------------+
*  20 |         LDDPARNT          |         LDDFPNTR          |
*     +---------------------------+---------------------------+
*  28 |         LDDBPNTR          |         LDDRDEV           |
*     +---------------------------+---------------------------+
*  30 |                                                       |
*     =                       LDDLOCK                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  48 |                       LDDIDENT                        |
*     |                                                       |
*     +-------------------------------------------------------+
*  58
*
*** LDDBK - LOGICAL DISPLAY DEVICE SIMULATION BLOCK

 

LDDBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
LDDACCPT       0019 40
LDDACCST       001A 80
LDDACCWT       0018 80
LDDBKID        0000
LDDBPNTR       0028
LDDBUFAD       0008
LDDBUFL        001C
LDDBUFPG       001B 08
LDDCOUNT       0010
LDDCPBUF       001B 40
LDDCRCW        0014
LDDCURPR       0019
LDDCURVR       0005 00000001
LDDDEAD        001B 10
LDDDEVID       001A 10
LDDDEVIP       001A 08
LDDEXTCD       0017
LDDEXTFT       001A 40
LDDEXTRN       0019 20
LDDEXT3        0019 04
LDDFPNTR       0024
LDDHVM24       001B 01
LDDIDENT       0048
LDDKILLD       0017 00000001
LDDLDNUM       0006
LDDLERR        001B 20
LDDLOCK        0030
LDDMAR1        0005 00000001
LDDMVPTL       0019 10
LDDNAME        0000
LDDNOEWA       001A 20
LDDNTFY        0017 00000003
LDDNTYDN       001B 02
LDDPARNT       0020
LDDPRBWT       0018 40
LDDPRDBU       0019 08
LDDPRES        0019 80
LDDPREXT       0018 04
LDDPRMWT       0018 20
LDDPURGE       001B 80
LDDRDBUF       0017 00000004
LDDRDEV        002C
LDDRDMOD       0017 00000005
LDDSCHAR       001A
LDDSELR        001B 04
LDDSENSE       0015
LDDSIZE        0048 0000000B
LDDSTATS       001B
LDDSTAWT       0018 10
LDDSUSP        000C
LDDUSTTS       0016
LDDVERS        0005
LDDWACWT       0018 08
LDDWRT         0017 00000002
LDDWTNG        0018

This information is based on z/VM V6R2.0. Last updated on 21 Nov 2011 at 11:07:10 EDT.
Copyright IBM Corporation, 1990, 2011