REFBK Back to Index page
 
Prolog 
Control Block Contents 
   REFBK DSECT
   REFENTRY 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.


  REFBK Prolog Top of page
 
 NAME       : HCPREFBK
 DESCRIPTION: Page References Services Parameter Block
 DSECT      : REFBK
 FUNCTION   : The REFBK is used to pass parameters for
              diagnose X'258'.
 LOCATED BY : Guest Rx register.
 CREATED BY : Created in the guest virtual machine's storage and
              copied to VMDVOBUF for CP to use.
 DELETED BY : Deleted by the guest virtual machine.
 SERIALIZED : Guest Virtual Machine is responsible.
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : Changes to this control block may require macros
              PFAULT and REFPAGE to also change.
 
 
  REFBK Control Block Content Top of page
 

 REFBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure REFBK Page References Services Parameter Block 0000 0 Signed 2 REFDIAGC Diagnose number. 0002 2 Signed 2 REFFCODE Diagnose function code. 0004 4 Signed 2 REFDWLEN Size of block in doublewords 0006 6 Signed 2 REFVERSN Version number of this REFBK .... ...1 REFVER1 1 REFVER1 Indicates REFBK is version 1 .... ..1. REFVER2 2 REFVER2 Indicates REFBK is version 2 0008 8 Dbl-Word 8 * (0) 0008 8 Address 8 REFGADDR For version 2, fcn code 0, PFAULT TOKEN, this field contains the guest real addr of the token to be assoc. with version 2 page fault handshaking. 0008 8 Signed 4 REFALET For function code 03, BLOCK form of INFORM function, this field contains the ALET of the address space containing the pages about to be referenced. 000C 12 Address 4 REFADDR (0) For version 1, fcn code 0, PFAULT TOKEN, this field contains the guest real address of the token to be associated with AR-specified page fault handshaking. For function code 02, LIST form of INFORM function, this field contains the guest real address of the page list. The page list is a set of ALET/page numbers. For function code 03, BLOCK form of INFORM function, this field contains the starting absolute page address of a range of pages. 000C 12 Bitstring 3 * First part of address. 000F 15 Bitstring 1 REFADDR3 Used to check last byte. 0010 16 Signed 8 REFSELMK For version 2, fcn code 0, PFAULT TOKEN, this field contains the selection mask to be associated with version 2 page fault handshaking. Note: When not in z/Architecture bits 33-63 are ignored. 0010 16 Signed 4 REFCOUNT For function code 02, LIST form of INFORM function, this field contains the count of ALET/page number pairs in the list pointed to by REFADDR. 00000002 REFCTMIN 2 Minimum number of entries for list form. 00004000 REFCTMAX 16384 Maximum number of entries for list form. 00000010 REFGROUP REFCOUNT For function code 03, BLOCK form of INFORM function, this field contains the count of the number of span of pages that are about to be referenced. 00040000 REFGRPMX 262144 Maximum number of groups for block form. 0014 20 Signed 4 REFSBGRP For function code 03, BLOCK form of INFORM function, this field contains the count of the number of subgroup that are about to be referenced. 00040000 REFSGPMX REFGRPMX Maximum number of subgroups for block form. 0018 24 Signed 8 REFCMPMK For version 2, fcn code 0, PFAULT TOKEN, this field contains the compare mask to be associated with version 2 page fault handshaking. Note: When not in z/Architecture bits 33-63 are ignored. 0018 24 Signed 4 REFSPAN For function code 03, BLOCK form of INFORM function, this field contains the number of consecutive pages that should be condisered as a single span of pages within the range of pages. 00040000 REFSPNMX REFGRPMX Maximum number of spans for block form. 001C 28 Signed 4 REFSKIP For function code 03, BLOCK form of INFORM function, this field contains the number of pages that should be considered as a gap between each block. This value is number of pages calculated by subtracting any block ending address (plus one) from the next block starting address. 00020000 REFSKPMX 131072 Maximum number of skips for block form. 0020 32 Bitstring 1 REFV2FLG Version 2 flag byte 1... .... REFZARCH X'80' REFZARCH When set, the vCPU must be running in z/Architecture mode. When not set, the vCPU must be running in non z/Architecture mode. 0021 33 Bitstring 1 * (3) Reserved for IBM use 0024 36 Signed 4 * Reserved for IBM use 0020 32 Bitstring 1 REFDIREC Byte used to indicate ascending and descending order. It also indicates whether REFADDR is the lowest address or the highest. This should be 1 (ascending) or descending (-1), but the value is not validated. Bit 0 is check to see if it is ascending (0) or descending (1). 1111 1111 REFDESCD X'FF' Minus one to indicate descending order. 0021 33 Bitstring 1 * (3) Reserved for IBM use. 0024 36 Signed 4 * Reserved for IBM use. 00000004 REFNZTKL 4 Token area is 4 bytes when guest is not in z/Architecture mode. 00000008 REFZTKNL 8 Token area is 8 bytes when guest is in z/Architecture mode. 00000028 REFLEN *-REFBK REFBK length in bytes. 00000005 REFSIZE (REFLEN+7)/8 REFBK size in doublewords This DSECT used to reference the list form of REFPAGE.
 REFENTRY DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure REFENTRY Page References Services Parameter Block 0000 0 Dbl-Word 8 REFCUREN (0) Current entry. 0000 0 Address 4 REFCALET Current ALET entry. 0004 4 Address 4 REFCADDR Current address to block. 00000008 REFLSTSZ *-REFENTRY Size of entry. 0008 8 Dbl-Word 8 REFNXTEN (0) Next entry. 0008 8 Address 4 REFNALET Next ALET entry. 000C 12 Address 4 REFNADDR Next address to block. The following is used to get count of entries per page. 00000200 REFENPPG (*-*+4096)/(REFNXTEN-REFCUREN) The number of entries per page.
 
 
  REFBK Storage Layout Top of page
 
 
*** REFBK - Page References Services Parameter Block
*
*     +-------------+-------------+-------------+-------------+
*   0 |  REFDIAGC   |  REFFCODE   |  REFDWLEN   |  REFVERSN   |
*     +-------------+-------------+-------------+-------------+
*   8 |                       REFGADDR                        |
*     +-------------------------------------------------------+
*  10
*
*** REFBK - Page References Services Parameter Block
 
*** Overlay for REFGADDR in REFBK
*
*     +---------------------------+--------------------+------+
*   8 |         REFALET           |////////////////////|:ADDR3|
*     +---------------------------+--------------------+------+
*  10 |                       REFSELMK                        |
*     +-------------------------------------------------------+
*  18
*
*** Overlay for REFGADDR in REFBK
 
*** Overlay for REFSELMK in REFBK
*
*     +---------------------------+---------------------------+
*  10 |         REFCOUNT          |         REFSBGRP          |
*     +---------------------------+---------------------------+
*  18 |                       REFCMPMK                        |
*     +-------------------------------------------------------+
*  20
*
*** Overlay for REFSELMK in REFBK
 
*** Overlay for REFCMPMK in REFBK
*
*     +---------------------------+---------------------------+
*  18 |         REFSPAN           |         REFSKIP           |
*     +------+--------------------+---------------------------+
*  20 |:V2FLG|////////////////////|///////////////////////////|
*     +------+--------------------+---------------------------+
*  28
*
*** Overlay for REFCMPMK in REFBK
 
*** Overlay for REFV2FLG in REFBK
*
*     +------+--------------------+---------------------------+
*  20 |:DIREC|////////////////////|///////////////////////////|
*     +------+--------------------+---------------------------+
*  28
*
*** Overlay for REFV2FLG in REFBK
 
*** REFENTRY - Page References Services Parameter Block
*
*     +---------------------------+---------------------------+
*   0 |         REFCALET          |         REFCADDR          |
*     +---------------------------+---------------------------+
*   8 |         REFNALET          |         REFNADDR          |
*     +---------------------------+---------------------------+
*  10
*
*** REFENTRY - Page References Services Parameter Block
 
 
  REFBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
REFADDR        000C
REFADDR3       000F
REFALET        0008
REFCADDR       0004
REFCALET       0000
REFCMPMK       0018
REFCOUNT       0010
REFCTMAX       0010 00004000
REFCTMIN       0010 00000002
REFCUREN       0000
REFDESCD       0020 FF
REFDIAGC       0000
REFDIREC       0020
REFDWLEN       0004
REFENPPG       000C 00000200
REFFCODE       0002
REFGADDR       0008
REFGROUP       0010 00000010
REFGRPMX       0010 00040000
REFLEN         0024 00000028
REFLSTSZ       0004 00000008
REFNADDR       000C
REFNALET       0008
REFNXTEN       0008
REFNZTKL       0024 00000004
REFSBGRP       0014
REFSELMK       0010
REFSGPMX       0014 00040000
REFSIZE        0024 00000005
REFSKIP        001C
REFSKPMX       001C 00020000
REFSPAN        0018
REFSPNMX       0018 00040000
REFVERSN       0006
REFVER1        0006 01
REFVER2        0006 02
REFV2FLG       0020
REFZARCH       0020 80
REFZTKNL       0024 00000008
 
This information is based on z/VM 6.4.0 Last updated on 24 Aug 2016 at 09:42:47 EDT.
Copyright IBM Corporation, 1990, 2016