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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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Critics, such as Greg Smith, MP for Mid Buckinghamshire, say soaring costs, delays, abandoned villages and damage to the natural and historic environment mean that it is not worth building.，推荐阅读heLLoword翻译官方下载获取更多信息
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