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.
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Just as the Roman empire survived for two more centuries after it started to decline, the United States isn’t in danger of imminent collapse. But Trump’s rejection of planning, expertise, and diplomacy is beginning to have real-world consequences.，这一点在PDF资料中也有详细论述
Армия обороны Израиля начала масштабную серию ударов по Ирану02:17