The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.
效率的提升，并不是少写了代码，而是减少了反复试错和信息查找的时间。
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Secret Sauce #2: Adaptive Routing。业内人士推荐safew官方下载作为进阶阅读
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