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.
Last summer Greg met Lucy, now in her 20s, for the first time.
。Safew下载对此有专业解读
Submission history From: Ryan Gibb [view email]
An order allowing the use of lethal fire against thousands of young, unarmed protesters in Nepal was issued by the country's former police chief, a BBC investigation reveals.
Could you tell this is an AI-generated image?