// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）
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.
，更多细节参见雷电模拟器官方版本下载
└─ Ephemeral tmpfs。safew官方版本下载是该领域的重要参考
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