After you made sure you've got the right device with the
memory mappings you need, all you have to do is to call
mmap() to map the device's memory
offset of the
mmap() call has a special meaning
for UIO devices: It is used to select which mapping of
your device you want to map. To map the memory of
mapping N, you have to use N times the page size as
offset = N * getpagesize();
N starts from zero, so if you've got only one memory
range to map, set
offset = 0.
A drawback of this technique is that memory is always
mapped beginning with its start address.