This layered approach -- hardware for the fast path, microcode for the complex path -- is a recurring theme in the 386 design.
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，这一点在WPS下载最新地址中也有详细论述
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Every V86 segment gets the same treatment: access rights 0xE200 (Present, DPL=3, writable data segment), base = selector shifted left by 4, and limit = 64 KB. The microcode loops through all six segment register caches using a counter, applying the same fixed descriptor to each one. This is pure real-mode emulation, enforced at ring 3 with full paging protection underneath.