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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Юлия Сычева (корреспондент)
Башкирия стала третьим регионом за день, где объявили ракетную опасность. Ранее 27 февраля такой режим впервые ввели в Татарстане и Пермском крае. Детей в школах и садиках Казани временно эвакуировали в специальные укрытия.，这一点在91视频中也有详细论述