IBM: LRARG

Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

LRARG

Prolog

Control Block Contents

LRARG DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

LRARG Prolog

 NAME       : HCPLRARG
 DESCRIPTION: Locate Record CCW argument mapping
 DSECT      : LRARG
 FUNCTION   : Map the argument of a Locate Record CCW
 LOCATED BY : None
 CREATED BY : None
 DELETED BY : None
 NOTES      : This is a bilingual control block, containing
              both the PLAS and ASSEMBLER versions.

LRARG Control Block Content


LRARG DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LRARG          Locate Record CCW argument
                                        mapping
0000    0 Bitstring   16 LRDATA (0)
0000    0 Bitstring    1 LROPER         operation byte
          .... ....      LROPOCNT       X'00' orientation on count area
          .1.. ....      LROPOHA        X'40' orientation on home address
          1... ....      LROPOD         X'80' orientation on data area
          11.. ....      LROPOI         X'C0' orientation on index
     OPERATION BYTE BITS 0-1
     OPERATION BYTE BITS 2-7
          .... ....      LROPCOR        X'00' operation code orient
          .... ...1      LROPCWD        X'01' operation code write data
          .... ..11      LROPCFW        X'03' operation code format write
          .... .11.      LROPCRD        X'06' operation code read data
          .... 1.11      LROPCWT        X'0B' operation code write track
          .... 11..      LROPCRTS       X'0C' operation code read tracks
          ...1 .11.      LROPCR         X'16' operation code read
0001    1 Bitstring    1 LRAUX          auxiliary byte
          1... ....      LRAUXTY        X'80' bytes 14-15 contain a
                                        transfer length factor
     AUXILIARY BYTE BIT 0
     AUXILIARY BYTE BITS 1-6 EQU X'00' must be 0
     AUXILIARY BYTE BIT 7
          .... ...1      LRAUXRSY       X'01' a Read Count CCW is
                                        suffixed to the Locate Record
                                        domain
0002    2 Bitstring    1 *              reserved, must be 0
0003    3 Bitstring    1 LRRECNT        record count
0004    4 Bitstring    4 LRSEEK@ (0)    seek address
0004    4 Bitstring    2 LRSKCYL        seek cylinder
0006    6 Bitstring    2 LRSKHD         seek head
0008    8 Bitstring    5 LRSRCH@ (0)    search address
0008    8 Bitstring    2 LRSRCYL        search cylinder
000A   10 Bitstring    2 LRSRHD         search head
000C   12 Bitstring    1 LRSRR          search record
000D   13 Bitstring    1 LRSECTOR       sector number
000E   14 Bitstring    2 LRTLF          transfer length factor
          00000010       LRARGLEN       *-LRARG LOCATE RECORD data area
                                        length

LRARG Storage Layout

*** LRARG - Locate Record CCW argument mapping
*
*     +------+------+------+------+-------------+-------------+
*   0 |LROPER|LRAUX |//////|:ECNT |  LRSKCYL    |   LRSKHD    |
*     +------+------+------+------+------+------+-------------+
*   8 |  LRSRCYL    |   LRSRHD    |LRSRR |:ECTOR|   LRTLF     |
*     +-------------+-------------+------+------+-------------+
*  10
*
*** LRARG - Locate Record CCW argument mapping