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.
三年研发之路，资金问题始终是悬在头顶的利剑。即便如此，波波不想找外部投资，也不愿预支发行的预付款，她始终觉得“拿人手短，会失去创作的自由”。，更多细节参见同城约会
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Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00538-4。safew官方版本下载对此有专业解读
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