Like all such hypoxia-addled-brain thoughts, it was a successful tweet.
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.
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Discussing the project with just a few of the developers, it’s immediately clear how current work will inform future efforts.
Both BAS and its American equivalent, the US Antarctic Program, advertise their jobs online. BAS also holds an open day in March.