BBC Inside Science

· · 来源:tutorial资讯

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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Hillary Clinton accused Comer of running a one-sided investigation that has failed to hold Trump and other Republican officials to account. “This institutional failure is designed to protect one political party and one public official,” she said.