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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.
。搜狗输入法下载对此有专业解读
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Days after the Taliban swept to power in 2021, Pakistan’s then spymaster appeared in Kabul on what looked to many like a victory lap. Sipping tea in the lobby of the Afghan capital’s fanciest hotel, Lt Gen Faiz Hameed told reporters: “Don’t worry, everything will be OK.”
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