时隔多年，阿豪的母亲与大舅在越南碰面，前往故居。（受访者供图）
// block: Wait for space (unbounded pending queue)
。业内人士推荐WPS官方版本下载作为进阶阅读
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.
│ VMM (User-Space) │ ◄── DEVICE EMULATION