LOCDSECT Back to Index page
 
Prolog 
Control Block Contents 
   LOCDSECT DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

 
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 LOCDSECT DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LOCDSECT       ,
0000    0 Bitstring   16 LOCAREA (0)
0000    0 Bitstring    1 LOCOP          OPERATION CODE
                        ***************ORIENTTAION
                       /      -------- OPERATION CODE
                     --      /
                       ------
          000000C0       LOCORIDX       B'11000000' ORIENTATION=INDEX
          00000040       LOCORHMA       B'01000000' ORIENTATION=HOME
                                        ADDRESS
          00000000       LOCORCNT       B'00000000' ORIENTATION=COUNT
          00000080       LOCORDAT       B'10000000' ORIENTATION=DATA
          00000001       LOCCMDWD       B'00000001' COMMAND=01 WRITE DATA
          00000003       LOCCMDFW       B'00000011' COMMAND=03 FORMAT
                                        WRITE
          00000006       LOCCMDRD       B'00000110' COMMAND=06 READ DATA
          0000000B       LOCCMDWT       B'00001011' COMMAND=0B WRITE
                                        TRACK
          0000000C       LOCCMDRT       B'00001100' COMMAND=0C READ TRACK
          00000016       LOCCMDRE       B'00010110' COMMAND=16 READ
             VALID COMMAND CODE COMBINATIONS:
          000000C3       LOCIDXFW       LOCORIDX+LOCCMDFW INDEX & 03
                                        FORMAT WRITE
          000000D6       LOCIDXRE       LOCORIDX+LOCCMDRE INDEX & 16 READ
          00000043       LOCHMAFW       LOCORHMA+LOCCMDFW HOME & 03
                                        FORMAT WRITE
          00000056       LOCHMARE       LOCORHMA+LOCCMDRE HOME & 16 READ
          0000004C       LOCHMART       LOCORHMA+LOCCMDRT HOME & 0C READ
                                        TRACK
          00000046       LOCHMARD       LOCORHMA+LOCCMDRD HOME & 06 READ
                                        DATA
          00000003       LOCCNTFW       LOCORCNT+LOCCMDFW COUNT & 03
                                        FORMAT WRITE
          00000016       LOCCNTRE       LOCORCNT+LOCCMDRE COUNT & 16 READ
          0000000C       LOCCNTRT       LOCORCNT+LOCCMDRT COUNT & 0C READ
                                        TRACK
          00000006       LOCCNTRD       LOCORCNT+LOCCMDRD COUNT & 06 READ
                                        DATA
          0000000B       LOCCNTWT       LOCORCNT+LOCCMDWT COUNT & 0B
                                        WRITE TRACK
          00000001       LOCCNTWD       LOCORCNT+LOCCMDWD COUNT & 01
                                        WRITE DATA
          00000096       LOCDATRE       LOCORDAT+LOCCMDRE DATA & 16 READ
          00000086       LOCDATRD       LOCORDAT+LOCCMDRD DATA & 06 READ
                                        DATA
          00000081       LOCDATWD       LOCORDAT+LOCCMDWD DATA & 01 WRITE
                                        DATA
0001    1 Bitstring    1 LOCAUX         AUXILLIARY BYTE
          1... ....      LOCAXTLF       B'10000000' LOCAXTLF TLF IS
                                        NON-ZERO
          .... ...1      LOCAXLR0       B'00000001' LOCAXLR0 LAST CCW IS
                                        "READ COUNT"
0002    2 Bitstring    1 *              RESERVED
0003    3 Bitstring    1 LOCCOUNT       NUMBER OF RECORDS, MUST BE > 0
0004    4 Bitstring    4 LOCSEEK (0)    SEEK ADDRESS
0004    4 Signed       2 LOCSKCC        SEEK CYLINDER
0006    6 Signed       2 LOCSKHH        SEEK HEAD
0008    8 Bitstring    5 LOCSRCH (0)    SEARCH ADDRESS
0008    8 Signed       2 LOCSRCC        SEARCH CYLINDER
000A   10 Signed       2 LOCSRHH        SERACH HEAD
000C   12 Bitstring    1 LOCSRR         SEARCH RECORD
000D   13 Bitstring    1 LOCSECTR       SECTOR NUMBER
000E   14 Signed       2 LOCTLF         TRANSFER LENGTH FACTOR (AVG
                                        BLKSIZE)
             DASD COUNT FILED DEFINITION
 
 
  LOCDSECT Storage Layout Top of page
  
          
*** LOCDSECT - Control Block in LOCDSECT
*
*     +------+------+------+------+-------------+-------------+
*   0 |LOCOP |LOCAUX|//////|:COUNT|  LOCSKCC    |  LOCSKHH    |
*     +------+------+------+------+------+------+-------------+
*   8 |  LOCSRCC    |  LOCSRHH    |LOCSRR|:SECTR|   LOCTLF    |
*     +-------------+-------------+------+------+-------------+
*  10
*
*** LOCDSECT - Control Block in LOCDSECT
 
 
  LOCDSECT Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
LOCAREA        0000
LOCAUX         0001
LOCAXLR0       0001 01
LOCAXTLF       0001 80
LOCCMDFW       0000 00000003
LOCCMDRD       0000 00000006
LOCCMDRE       0000 00000016
LOCCMDRT       0000 0000000C
LOCCMDWD       0000 00000001
LOCCMDWT       0000 0000000B
LOCCNTFW       0000 00000003
LOCCNTRD       0000 00000006
LOCCNTRE       0000 00000016
LOCCNTRT       0000 0000000C
LOCCNTWD       0000 00000001
LOCCNTWT       0000 0000000B
LOCCOUNT       0003
LOCDATRD       0000 00000086
LOCDATRE       0000 00000096
LOCDATWD       0000 00000081
LOCHMAFW       0000 00000043
LOCHMARD       0000 00000046
LOCHMARE       0000 00000056
LOCHMART       0000 0000004C
LOCIDXFW       0000 000000C3
LOCIDXRE       0000 000000D6
LOCOP          0000
LOCORCNT       0000 00000000
LOCORDAT       0000 00000080
LOCORHMA       0000 00000040
LOCORIDX       0000 000000C0
LOCSECTR       000D
LOCSEEK        0004
LOCSKCC        0004
LOCSKHH        0006
LOCSRCC        0008
LOCSRCH        0008
LOCSRHH        000A
LOCSRR         000C
LOCTLF         000E
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:59:22 EDT.
Copyright IBM Corporation, 1990, 2022