很多人天生会更好奇。我相信,经过传统教育,或在多人环境中工作之后,好奇心反而成了一种需要意志与纪律的决定。
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.。关于这个话题,safew官方下载提供了深入分析
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Speeding up virtual memory
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Пари Нижний Новгород