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.
"It just suddenly felt really old fashioned," says Jones. "It felt like I'd gone back 20 years."
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FT Digital Edition: our digitised print edition。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
Still, relatively low-tech responses to food crime are among the most useful.