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.
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。搜狗输入法2026对此有专业解读
“现行SAE分级是法律和责任的划分，非技术鸿沟。L3本质上是限定ODD运行范围的L4，因此跳过在技术上是个伪命题。“在公众号“电厂”的一篇文章中，原博世车载产品线负责人易强认为，L3是“缩小范围的L4”，区别主要是在法律法规上。法律人为限定了L3的使用范围。这才是当下L3和L4最大的不同。。爱思助手下载最新版本是该领域的重要参考
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