How to calculate page address to PFN in user space.

Hello, I have PFN of all processes in user space, how to calculate page address to PFN. eg . page address :bf05febc in kernel space. I have PFN no for user space processes as below. 8a81b 69da0 88cf4 88d06 88d07 9549f 952d0 9734a 87c7d 87ca0 How to calculate/match page address to PFN ? Regards, Pankaj