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Intel documentation describes the 386's Protection Test Unit as a component that "implements fast testing of complex memory protection functions." It is mostly composed of a PLA (Programmable Logic Array), referred to as Test PLA by Intel, that is physically visible by its regular appearance on the die. This single piece of combinational logic replaces what would otherwise be dozens of multi-cycle conditional branches in the microcode. Instead of testing privilege rules sequentially, the microcode issues a single protection test operation, and the PLA evaluates all applicable rules in parallel, producing a complete decision in one evaluation: continue, fault, or redirect to a gate handler.
，这一点在51吃瓜中也有详细论述
Before we get into the code, we need to understand why this was always going to end in a bloodbath. The entire history of DRM is, at its core, a history of trying to give someone a locked box while simultaneously handing them the fucking key. The film and music industries have been losing this battle since the first CSS-encrypted DVD was cracked in 1999.
Secret Sauce #1: Two-Level Routing
Ранее министр иностранных дел Омана Бадр аль-Бусаиди заявил, что Иран во время переговоров с США согласился отказаться от всех запасов обогащенного урана. Известно, что это требование Вашингтона было ключевым для заключения соглашения по ограничению ядерной программы Ирана. Имеющиеся запасы планируется переработать до минимального возможного уровня.