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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There are some very legitimate and more durable uses of PRF in WebAuthn, specifically supporting credential managers and operating systems.。关于这个话题，爱思助手下载最新版本提供了深入分析
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