CPTBK

Prolog  

Control Block Contents  
   CPTBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

CPTBK Prolog

 NAME       : HCPCPTBK
 DESCRIPTION: Channel program initialization block
 DSECT      : CPTBK
 FUNCTION   : To map the common channel program init. block
 LOCATED BY :
              RDCCPTA field in the HCPRDC Block.
 CREATED BY : CPTBK'S are static and are created by invocations
              of the HCPCPTBL macro within module HCPCPG.
 DELETED BY : CPTBK'S are not deleted.
 SERIALIZED : NONE.
 RELOCATION CONSIDERATIONS : None

CPTBK Control Block Content

CPTBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CPTBK          Channel program initialization block
0000    0 Dbl-Word     8 * (0)          Start of channel prog init. block
                                        Read Label
0000    0 Signed       4 RDLBS          Read Label CP Size
0004    4 Address      4 RDLBA          Read Label CP Entry Point Read
                                        Alloc Map
0008    8 Signed       4 RALOCS         Read Alloc CP Size
000C   12 Address      4 RALOCA         Read Alloc CP Entry Point Read
                                        Alloc Map Metadata
0010   16 Signed       4 RALMTS         Read Alloc Meta CP size
0014   20 Address      4 RALMTA         Read Alloc Meta CP Entry Pt.
                                        Write Label
0018   24 Signed       4 WRTLBS         Write Label CP Size
001C   28 Address      4 WRTLBA         Write Label CP Entry Point Write
                                        Alloc Map
0020   32 Signed       4 WALOCS         Write Alloc CP Size
0024   36 Address      4 WALOCA         Write Alloc CP Entry Point Erase
                                        Extent
0028   40 Signed       4 EREXTS         Erase Extent CP Size
002C   44 Address      4 EREXTA         Erase Extent CP Entry Point
                                        Unload Buffer
0030   48 Signed       4 UNLODS         Unload Buffer CP Size
0034   52 Address      4 UNLODA         Unload Buffer CP Entry Point
                                        Sense Id
0038   56 Signed       4 SNSIDS         Sense ID CP Size
003C   60 Address      4 SNSIDA         Sense ID CP Entry Point Perform
                                        Subsystem Function
0040   64 Signed       4 PSFS           PSF CP Size
0044   68 Address      4 PSFA           PSF CP Entry Point
0048   72 Bitstring    1 CPARCH         Device Arch
          1... ....      CPFBA          X'80' Device Arch is DASD/FBA
          .1.. ....      CPCKD          X'40' Device Arch is DASD/CKD
          ..1. ....      CPECKD         X'20' Device Arch is DASD/ECKD
          ...1 ....      CPCKDE         X'10' Device Arch is DASD/CKD-E
          .... 1...      CPTAPE         X'08' Device Arch is TAPE
0049   73 Bitstring    3 *              Reserved
          0000004C       CPBTSZ         (*-CPTBK) Number of bytes
          0000000A       CPTSIZE        (*-CPTBK+7)/8 Number of
                                        doublewords

CPTBK Storage Layout

          
*** CPTBK - Channel program initialization block
*
*     +---------------------------+---------------------------+
*   0 |          RDLBS            |          RDLBA            |
*     +---------------------------+---------------------------+
*   8 |          RALOCS           |          RALOCA           |
*     +---------------------------+---------------------------+
*  10 |          RALMTS           |          RALMTA           |
*     +---------------------------+---------------------------+
*  18 |          WRTLBS           |          WRTLBA           |
*     +---------------------------+---------------------------+
*  20 |          WALOCS           |          WALOCA           |
*     +---------------------------+---------------------------+
*  28 |          EREXTS           |          EREXTA           |
*     +---------------------------+---------------------------+
*  30 |          UNLODS           |          UNLODA           |
*     +---------------------------+---------------------------+
*  38 |          SNSIDS           |          SNSIDA           |
*     +---------------------------+---------------------------+
*  40 |           PSFS            |           PSFA            |
*     +------+--------------------+---------------------------+
*  48 |CPARCH|////////////////////| 4C
*     +------+--------------------+
*
*** CPTBK - Channel program initialization block

CPTBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
CPARCH         0048
CPBTSZ         0049 0000004C
CPCKD          0048 40
CPCKDE         0048 10
CPECKD         0048 20
CPFBA          0048 80
CPTAPE         0048 08
CPTSIZE        0049 0000000A
EREXTA         002C
EREXTS         0028
PSFA           0044
PSFS           0040
RALMTA         0014
RALMTS         0010
RALOCA         000C
RALOCS         0008
RDLBA          0004
RDLBS          0000
SNSIDA         003C
SNSIDS         0038
UNLODA         0034
UNLODS         0030
WALOCA         0024
WALOCS         0020
WRTLBA         001C
WRTLBS         0018