PIDAWBK

Prolog  

Control Block Contents  
   PIDAWBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

PIDAWBK Prolog

 Name       : HCPPIDAW
 Description: Paging I/O Format 2 IDAW for paging
              channel programs
 DSECT      : PIDAWBK
 Function   : A PIDAW contains one Format 2 IDAW for allowing
              paging channel programs to do I/O to 64 bit host
              absolute addresses.
 Located by : PIORDWRA  - Contains the pointer to the PIDAW
              for that PIOBK.  For devices on which
              CKD channel programs are used, PIORDWRA
              in the first PIOBK in a PIOBK area
              points to a separate PIDAW area.  For
              ECKD and FBA devices, PIORDWRA points to
              a PIDAW contained *within* the PIOBK
              itself.
 Created by : HCPRDAAT  As part of initialization or during
              ATTACH time for CP-owned volumes
              (explicitly, separately from the PIOBK,
              for devices on which CKD channel programs
              are used, or implicitly, as part of the
              PIOBK, for ECKD and FBA devices).
 Deleted by : HCPRDDDT  Released if the CP owned volume is
              DETACHed
 Comments   : Must be backed below 2-Gig when gotten explicitly for
              CKD devices.  (PIOBKs are also backed below 2-Gig.)

PIDAWBK Control Block Content

PIDAWBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      PIDAWBK        Paging I/O Format 2 IDAW for
                                        paging
0000    0 Dbl-Word     8 PIDAW          One paging IDAW (format 2)
0008    8 Dbl-Word     8 PIDAWNXT (0)   Next PIDAW
          00000008       PIDAWLEN       *-PIDAW Size of one PIDAW in
                                        bytes
          00000001       PIDAWSIZ       ((*-PIDAW)+7)/8 Size of one PIDAW
                                        in dws
      End of PIDAW definitions

PIDAWBK Storage Layout

          
*** PIDAWBK - Paging I/O Format 2 IDAW for paging
*
*     +-------------------------------------------------------+
*   0 |                        PIDAW                          |
*     +-------------------------------------------------------+
*
*** PIDAWBK - Paging I/O Format 2 IDAW for paging

PIDAWBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
PIDAW          0000
PIDAWLEN       0008 00000008
PIDAWNXT       0008
PIDAWSIZ       0008 00000001