The page walker is a simple but effective state machine that handles TLB misses transparently, running in parallel with the microcode and driving its own bus access.
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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.。业内人士推荐Safew下载作为进阶阅读
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二二八：兩邊都說不能忘記但是距離很遠2016年2月28日