Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
PTTBK
PrologControl Block Contents
PTTBK DSECT
Storage Layout
Cross Reference
PTTBK Prolog
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. COMMENTS :
PTTBK Control Block Content
PTTBK DSECT
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
*** PTTBK - Page Translation (HCPPTZMT) parameters * * +---------------------------+---------------------------+ * 0 | PTTBEGHI | PTTBEGLO | * +---------------------------+---------------------------+ * 8 | PTTENDHI | PTTENDLO | * +---------------------------+---------------------------+ * 10 | | * = PTTPGST = * | | * +-------------------------------------------------------+ * 110 | PTTASIT | * +-------------------------------------------------------+ * 118 * *** PTTBK - Page Translation (HCPPTZMT) parameters
PTTBK Cross Reference
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
Last updated on 30 Mar 2001 at 08:34:14 EDT.
Copyright IBM Corporation, 1990, 2001