Memory mapped IO - how is it done?

Question

I\'ve read about the difference between port mapped IO and memory mapped IO, but I can\'t figure out how memory mapped Io is implemented in modern operating systems (windows or

Answer 1

http://en.wikipedia.org/wiki/Memory-mapped_I/O

http://www.cs.umd.edu/class/sum2003/cmsc311/Notes/IO/mapped.html

Essentially it is just a form of accessing the data, as if you are saving / reading from the memory. But the hardware will snoop on the address bus, and when it sees the address targetting for him, it will just receive the data on the data bus.