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Inter-Office Memorandum

To Debugger Planners Date June 15, 1978

From Barbara Koalkin Location Palo Alto

Subject Issues - VM to oA log file Organization SOD/SO/DE
XEROX SDD ARCHIVES
XEROX I have read and understood
Pages_ _ _ _To _ _ _ _.
Reviewer Date_ __
Filed on: [Iris] >
XD PilotDebugger6-15.bravo
I of Pages Ref .. 7ISb.b-/~~
The following list is a set of issues related to working out the interface for the VM to OA
log file. These issues have been discussed in the June 14th meeting of Pilot Implementors
(Johnsson, Koalkin, Lauer, McJones, Redell. Sandman, and Wick).

1. We need a mapping from virtual memory to physical disk address.
Can Pitot provide this?

Pilot has agreed to provide a log of changes to its virtual memory to physical disk address
(e.g. drive. head. track. sector) map for use by the debugger. Pilot must go through several
levels of mapping in order to provide this: from virtual memory to file id and file page
number, to virtual disk address, to seek address (through the exception table and Pilot disk
driver). to physical disk address. The debugger will use this log to build a complete map of
virtual memory to disk addresses.

2. We propose having part of the file label (i.e .