FRQBK

Prolog  

Control Block Contents  
   FRQBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

FRQBK Prolog

 NAME       : HCPFRQBK
 DESCRIPTION: Frame Request Block
 DSECT      : FRQBK
 FUNCTION   : A Frame Request Block is used by HCPFRQ to manage
              deferred requests for one or more non-contiguous
              frames.
 LOCATED BY : RSMFRQCR - points to the current FRQBK being serviced.
              FRQNEXT/FRQPREV - FRQBKs for different requesters in
              a circular doubly linked list.
              FRQSNXT - FRQBKs for the same requester in a singly
              linked list in ascending order of sequence number.
 CREATED BY : HCPFRQCR
 DELETED BY : HCPFRQAS, HCPFRQCN
 REFERENCES : See HCPFRQ for information about the usage of
              this block.
 SERIALIZED : The RSMFRQLK informal spin lock must be
              held when accessing the FRQBKs within the
              chain structure, and also when accessing the
              FRQBK related fields in the RSMBK.
 RELOCATION CONSIDERATIONS : None
 NOTES      :

FRQBK Control Block Content

FRQBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FRQBK          Frame Request Block
0000    0 Dbl-Word     8 * (0)
0000    0 Address      4 FRQNEXT        Pointer to next requester FRQBK
                                        or zero
0004    4 Address      4 FRQPREV        Pointer to prev requester FRQBK
                                        or zero
0008    8 Address      4 FRQSNXT        Pointer to next FRQBK for same
                                        requester
000C   12 Signed       4 FRQFRCNT       Count of frames requested
0010   16 Dbl-Word     8 FRQSEQNO       Requester sequence number
0018   24 Signed       4 FRQREQID       Requester ID
001C   28 Address      4 FRQSVGBK       Address of requester's SVGBK to
                                        resume when request is satisfied
                                        or canceled
0020   32 Signed       4 * (4)          Reserved for future IBM use
          00000006       FRQDSIZE       ((*-FRQBK)+7)/8 FRQBK size in
                                        double-words
          00000030       FRQBSIZE       FRQDSIZE*8 size in bytes

FRQBK Storage Layout

          
*** FRQBK - Frame Request Block
*
*     +---------------------------+---------------------------+
*   0 |         FRQNEXT           |         FRQPREV           |
*     +---------------------------+---------------------------+
*   8 |         FRQSNXT           |         FRQFRCNT          |
*     +---------------------------+---------------------------+
*  10 |                       FRQSEQNO                        |
*     +---------------------------+---------------------------+
*  18 |         FRQREQID          |         FRQSVGBK          |
*     +---------------------------+---------------------------+
*  20 |///////////////////////////////////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  30
*
*** FRQBK - Frame Request Block

FRQBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
FRQBSIZE       0020 00000030
FRQDSIZE       0020 00000006
FRQFRCNT       000C
FRQNEXT        0000
FRQPREV        0004
FRQREQID       0018
FRQSEQNO       0010
FRQSNXT        0008
FRQSVGBK       001C