「我認為能參與如此了不起的事情是一種榮幸和特權,並有機會和一位我認為非常不凡的人相處。請注意,我沒有任何其他意思,只是把他視為一位非常卓越的前總統。」
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.,更多细节参见91视频
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Monica de Bolle
ITmedia�̓A�C�e�B���f�B�A�������Ђ̓o�^���W�ł��B,这一点在safew官方版本下载中也有详细论述