Implicit Trust Upgrade: Google retroactively applied sensitive privileges to existing keys that were already rightfully deployed in public environments (e.g., JavaScript bundles).
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:，更多细节参见heLLoword翻译官方下载
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Some elements that fall outside of a design are tricky to retrieve.
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