Пари Нижний Новгород
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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靠“阴伟达” 救场？就在濒临绝境时，“阴伟达” 横空出世，成了救命的 “强心针”。
The 386's protection architecture is a study in engineering tradeoffs on a tight transistor budget. The designers put dedicated hardware where it paid off most: