Two dedicated I/O ports (to be accessed via IN/OUT instructions):
0xCF8 – selects the address (Bus, Node, Function, Offset)
0xCFC – data port
I/O mapped memory:
PCI configuration space, power management registers, ACPI PM base
Memory mapped:
LAPIC, IOAPIC
More in this presentation:
http://72.3.219.184/conference/2007/papers/rutkowska-joanna-slides.pdf
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