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.
动态的视觉律动：特有的视窗设计，让 CD 碟片旋转清晰可见，提供了一种数字屏幕无法替代的播放仪式感。
。91视频对此有专业解读
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Source: Computational Materials Science, Volume 266
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