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Prolog 
Control Block Contents 
   FRQBK 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.


  FRQBK Prolog Top of page
 
 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 Top of page
 

 FRQBK DSECT Top of page
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 Top of page
 
          
*** FRQBK - Frame Request Block
*
*     +---------------------------+---------------------------+
*   0 |         FRQNEXT           |         FRQPREV           |
*     +---------------------------+---------------------------+
*   8 |         FRQSNXT           |         FRQFRCNT          |
*     +---------------------------+---------------------------+
*  10 |                       FRQSEQNO                        |
*     +---------------------------+---------------------------+
*  18 |         FRQREQID          |         FRQSVGBK          |
*     +---------------------------+---------------------------+
*  20 |///////////////////////////////////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  30
*
*** FRQBK - Frame Request Block
 
 
  FRQBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
FRQBSIZE       0020 00000030
FRQDSIZE       0020 00000006
FRQFRCNT       000C
FRQNEXT        0000
FRQPREV        0004
FRQREQID       0018
FRQSEQNO       0010
FRQSNXT        0008
FRQSVGBK       001C
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:28:17 EDT.
Copyright IBM Corporation, 1990, 2020