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A POSTMORTEM FOR A
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User
ASSORTED REACTIONS
DISCUSSION
Disappointments
The fundamental ideas
Support for special user level programs
A SUCCESS
Unified conceptual framework
Easy to understand protection
Modularity with clean interfaces
It resulted in an almost error free ECS system
SOME DISAGREEABLE FACTS
Large
Slow
Difficult to use
SPEED UPS
Direct ECS access
Fast actions
Effect on the disk system
HARDWARE HELP
Sketch of entry to a system action
Many base bound pairs
Hardware capabilities
Capability memory reference instructions
Data memory reference instructions
Data manipulation instructions
Capability manipulation instructions
Reduce access bits
Read or write the datum part of a datum capability
Lock or unlock a capability
Create a new lock and key
Example
A REPLACEMENT FOR OUR MAP FACILITY
Disaster
An alternative
DISTRIBUTED SYSTEM CODE
SUMMARY AND PARTING WORDS
Summary
Parting words
BIBLIOGRAPHY
PROJECT HISTORY
PROJECT MEMBERS
Paul McJones
1998-06-22
