There are about 33 distinct test constants, covering every protection scenario on the 386. Each activates a different subset of the 148 product terms, encoding the specific privilege rules for that scenario. To give a feel for what the PLA does concretely, here are the possible outcomes for two tests:
Besides the Test PLA, the 386 has another PLA called the Entry PLA that maps opcodes to microcode entry points. One of its input bits is a "protected mode" flag. Many instructions have both a real-mode and a protected-mode entry point -- for instance, MOV ES, reg maps to address 009 (a single microcode line) in real mode, but to 580 (which initiates a full descriptor load with protection tests) in protected mode. The trick that makes V86 work is to define this flag as:。关于这个话题，heLLoword翻译官方下载提供了深入分析
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描述：n 个人排成一列，heights[i] 为第 i 个人的高度（互不相同）。第 i 个人能「看到」右侧第 j 个人的条件是：i < j 且两人之间所有人都比他们矮。返回 answer[i] 为第 i 个人在右侧能看到的人数。。关于这个话题，服务器推荐提供了深入分析