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.
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,这一点在旺商聊官方下载中也有详细论述
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我永远不会忘记第一次与乔布斯的谈话。当时苹果正在谷底挣扎,史蒂夫试图扭转局势。很多人怀疑公司能否存活。有人警告我,加入苹果的风险巨大。。夫子是该领域的重要参考