Water and dust resistance rating
Impact Tracking
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The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.
"If you build a nuclear reactor or or any kind of base on the moon, you can then start claiming that you have a safety zone around it, because you have equipment there," says Dr Barber.