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.

 
  LOCDSECT Control Block Content Top of page
 

 LOCDSECT DSECT Top of page
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