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.
Что думаешь? Оцени!
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园所性质:这个我觉得跟费用是挂钩的,看个人情况,私立我就不提了没那个财力不考虑,简单说一下公办、普惠的区别:
The first ERMA system went into use in 1959. While IBM was the leader in unit