[CSE]  Advanced Operating Systems 
  COMP9242 2002/S2  		UNSW
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Next: L4 Threads Up: 01-l4 Previous: L4 Implementation Example: MIPS

Main L4 Abstractions

threads:
execution abstraction and UIDs
tasks:
address spaces and resources
IPC:
message-based communication, including VM mappings
flexpages:
VM page abstraction, including multiple page sizes
clans and chiefs:
task hierarchy for (arbitrary) security models
pagers, excepters, preempters, interrupt handlers:
exceptions
  • Mostly strict separation of:
    • mechanisms (provided by kernel) and
    • policy (implemented by user-level servers).
  • Minimality achieved by orthogonality of mechanisms.

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Gernot Heiser 2002-08-07