三年前,我们还默认程序员是一个需要“拼体力”的行业:多写代码、多熬时间、多积累经验。
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,搜狗输入法2026提供了深入分析
originally provided for remote job entry, the conceptual ancestor of IBM's later
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