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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.
IBM had already built document processing machines that interacted with their。业内人士推荐safew官方版本下载作为进阶阅读
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computer keyboards to boot. Most radically, though, the 4700 line introduced，推荐阅读服务器推荐获取更多信息