What surprised me was that this entire walk is fully hardware-driven -- no microcode involvement at all. The state machine reads the page directory entry, reads the page table entry, checks permissions, and writes back the Accessed and Dirty bits, all autonomously. Since it's hardware-driven, it runs in parallel with the microcode and needs its own memory bus arbitration -- the paging unit must share the bus with both data accesses from the microcode and prefetch requests from the instruction queue.
// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）
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Евгений Силаев (Ночной линейный редактор)
“十四五”时期是我国全面建成小康社会之后，乘势而上为实现第二个百年奋斗目标而奋斗的第一个五年，是我国抓住难得机遇、顶住各种挑战、拓展发展新空间的关键时期。