i am confused about the function cpu_register_physical_memory_offset().
in this function, cpu register a segment of GPA to RAM or to a device.
Now, i want to write two new function ,one is
cpu_register_physical_memory_offset_to_RAM() and the other is
cpu_register_physical_memory_offset_to_device(),in the first function, i divide
the memory into pages,and creat a description for each page.Hower, i am
confuse about the 2nd function.
maybe, we i should think about the subpage init and subpage register.
would you give me some advice?
