accessing physical memory from linux kernel

Question

Can we access any physical memory via some kernel code.? Because, i wrote a device driver which only had init_module and exit_module.. the code is following.

Answer 1

To access real physical memory you should use phys_to_virt function. In case it is io memory (e.g. PCI memory) you should have a closer look at ioremap.

This whole topic is very complex, if you are a beginner I would suggest some kernel/driver development books/doc.