PTTBK Back to Index page
 
Prolog 
Control Block Contents 
   PTTBK 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.


  PTTBK Prolog Top of page
 
 NAME       : HCPPTTBK
 DESCRIPTION: Page Translation (HCPPTZMT) parameters
 DSECT      : PTTBK
 FUNCTION   : Describe the fixed parameters for a call to
              entry point HCPPTZMT, which is used to test
              for null pages (pages which have not been
              translated and are entirely zeroes) in a range
              of guest addresses.
 LOCATED BY :
 CREATED BY : HCPVCHCK - During VMDUMP processing
 DELETED BY : HCPVCHCK - During VMDUMP processing
 SERIALIZED : The PTTBK is created and deleted by a single
              invocation of HCPVCHCK and is not accessible
              to other processes.
 RELOCATION CONSIDERATIONS : None
 COMMENTS   :
 
 
  PTTBK Control Block Content Top of page
 

 PTTBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure PTTBK Page Translation (HCPPTZMT) parameters Entry Point HCPPTZMT Parameter List is defined here. 0000 0 Dbl-Word 8 PTTBEGIN (0) First 64-bit address in range 0000 0 Signed 4 PTTBEGHI High half of start address 0004 4 Signed 4 PTTBEGLO Low half of start address 0008 8 Dbl-Word 8 PTTEND (0) Last 64-bit address in range 0008 8 Signed 4 PTTENDHI High half of end address 000C 12 Signed 4 PTTENDLO Low half of end address 0010 16 Bitstring 1 PTTPGST (256) STATUS BYTES FOR EACH PAGE IN THE RANGE. MAXIMUM RANGE IS ONE MEG (I.E. ONE SEGMENT). 0110 272 Dbl-Word 8 PTTASIT ADDR SPACE ID TOKEN FOR REQUEST 1... .... PTTNULL X'80' Page is null (has not been translated and is entirely zeroes) End of Parameter List definitions. 00000118 PTTBKLEN *-PTTBK LENGTH OF PTTBK IN BYTES 00000023 PTTSIZE (PTTBKLEN+7)/8 LENGTH OF PTTBK IN DWORDS
 
 
  PTTBK Storage Layout Top of page
 
          
*** PTTBK - Page Translation (HCPPTZMT) parameters
*
*     +---------------------------+---------------------------+
*   0 |         PTTBEGHI          |         PTTBEGLO          |
*     +---------------------------+---------------------------+
*   8 |         PTTENDHI          |         PTTENDLO          |
*     +---------------------------+---------------------------+
*  10 |                                                       |
*     =                       PTTPGST                         =
*     |                                                       |
*     +-------------------------------------------------------+
* 110 |                       PTTASIT                         |
*     +-------------------------------------------------------+
* 118
*
*** PTTBK - Page Translation (HCPPTZMT) parameters
 
 
  PTTBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
PTTASIT        0110
PTTBEGHI       0000
PTTBEGIN       0000
PTTBEGLO       0004
PTTBKLEN       0110 00000118
PTTEND         0008
PTTENDHI       0008
PTTENDLO       000C
PTTNULL        0110 80
PTTPGST        0010
PTTSIZE        0110 00000023
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:53:54 EDT.
Copyright IBM Corporation, 1990, 2022