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发布时间:2015-05-14 11:57:58
1) IO (ports) / MMIO. IO ports are in/out instructions, whereas MMIO has memory semantics. Everything starts with IO ports. Older devices (most ISA, many PCI) are entirely implemented with IO ports - including some notably important devices like the PS/2 controller or VGA device. But th.........【阅读全文】