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.
但理想主义和现实主义之间,难免会有碰撞,尤其是前沿模型的研发,往往需要长期、稳定的战略支持以及低压力的资金环境。不上市,反而有利于公司避开资本的短期干扰,让月之暗面尽可能为那个长期目标而战。
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