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io_p2v in kernel-code

Hi all,

while writing device driver for serial port in case of
StrongARM ( assabet sa1100 ), i got the following term
in linux kernel code.

#define Ser0DCSR (*(( volatile Word *) io_p2v (
_Ser0UDCSR ))) 

plz tell me what's the role of io_p2v and why its
required.

Thanks in Advance,
Deepak Joshi.


		
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