Map virtual addresses to physical
phys_addr_t virt_to_phys(volatile void * address);
address
address to remap
The returned physical address is the physical (CPU) mapping for the memory address given. It is only valid to use this function on addresses directly mapped or allocated via kmalloc.
This function does not give bus mappings for DMA transfers. In almost all conceivable cases a device driver should not be using this function