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.
char bucket = 60 - __builtin_clzll(byte_size);
，这一点在91视频中也有详细论述
越是伟大的事业，越要坚持实事求是。
有趣的是，联想还为该平板设计了一款斜挎便携包，能够收纳手写笔以及单侧展示背部扬声器。