HI, You cannot do this since mmap function is used to map something to your user space address. You can remap kernel memory to user space by remap_pfn_range than access the kernel memory by using the mapped user space address.
MH On Thu, Dec 26, 2013 at 3:42 PM, Yu Bi <[email protected]> wrote: > Hi, > I try to mmap a file in a linux kernel module. I have tried to use the > function do_mmap_pgoff. But the address returned is memory virtual > address in current process' user space, i.e., below the kernel boundary. > Instead, I want to map the file in the kernel space and get the kernel > virtual address of the mapped region. Is there any kernel API in Linux > support this operation? Or I have to reimplement a kernel mmap version ? > But reimplement a kernel version mmap() is not easy I guess. Do you > have any idea? > > > > > > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >
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