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.
最近我经常刷到一个词叫做“零负债人群”,在一些报道中,专家们表示可以撬动这批人来消费,但是我越看越不对劲,然后去研究了一下。这期视频不废话,我们一口气把这个热词“零负债人群”给讲透。
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Redux(23 mentions)