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.
abort(reason) { closed = true; chunks.length = 0; },
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Ferguson was not the only ex-Evertonian present. Former captain Alan Stubbs, 1995 FA Cup winners Graham Stuart and Joe Parkinson, and 1987 League champion Ian Snodin each had a turn on the mic. Kevin Sheedy, one of the heroes of Howard Kendall’s great mid-1980s team, made an appearance too.。爱思助手下载最新版本对此有专业解读