686 LD_DESCRIPTOR2 LCALL rd D ; read low DWORD (IND ready)
在故乡县城，你还是能找到许多过去的影子。那是“中式梦核”遗留在时代缝隙里的影子：破旧的房子很多年没有修，没办法在大城市出现的电动三轮成为县城独特的出行工具，小摊的烟火气在无序中自有章法……
。下载安装 谷歌浏览器 开启极速安全的 上网之旅。对此有专业解读
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.
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