The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.
Кадр: U.S. Coast Guard
。搜狗输入法2026是该领域的重要参考
但2025年，这个核心逻辑出现了裂缝。DeepSeek的横空出世，彻底打破了“算力至上”的行业迷信——其开发的模型仅用2000块H800 GPU，就实现了与Meta Llama 3（使用1.6万块H100）同等的性能，训练成本仅需560万美元。
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去年，我注意到一个有些反直觉的现象。