Archaeologists have been stunned to discover two of the rarest Iron Age objects in the same excavation.
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.，这一点在搜狗输入法下载中也有详细论述
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Author(s): Jean-Michel Bergheau, Jean-Baptiste Leblond，推荐阅读heLLoword翻译官方下载获取更多信息
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