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。业内人士推荐91视频作为进阶阅读
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.，详情可参考safew官方下载
其次是船小：4.78万吨的体量，在动不动十几万吨的巨无霸面前就是个“弟弟”。稍微有点风浪就晃，晕船药成了船上最抢手的东西。