memcpy(y, x, h->length * sizes[h->type]);
Individual developers and small teams with limited resources
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.，详情可参考51吃瓜
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"We like time to free up our mind. I get the best ideas when I walk my dog," says Marieke Pepers, chief people officer at the Dutch software firm Nmbrs.
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