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.
對於海外觀察人士而言，這種視角不難理解，過去十年，中國軍隊中的派系鬥爭被深入討論——一方是張又俠為首的「西北-裝備系」，包括李尚福等人；另一方是苗華、何衛東為核心的「東南-政工系」，扎根福建第31集團軍。
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Kevin Church,Science team
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