Kernel Question

Kernel Question

[Assem Salama]

I am runing RedHat 6.2, kernel version: 2.2.14-5.0

I have a couple of questions:
    When I try to use ioremap, it gives me an undefined refernce. So, I
ended up using __ioremap. Is this the right way? Am I missing something?

same thing happened with memcpy, and virt_to_phys.

    Also, I have a PCI board with 16MB of onboard memory. I got the
driver to probe the device and everything. I used __ioremap to remap the

PCI memory into virtual memory and I can read and write to it in kernel
space. Now, I want to be able to do that through user space. So, I
implemented mmap into my driver. I use remap_page_range with the
following arguments:

in init_mdoule()
myri_phys = (unsigned long) dev->base_address[0] &
PCI_BASE_ADDRESS_MEM_MASK;
...

in mydrv_mmap()
remap_page_range(vmP->vm_start, myri_phys,16*1024*1024 /* 16MB */,
vmP->vm_page_prot)

however, when I call mmap from user space, the machine either hangs or
completely reboots.

Any help would be greatly appreciated.
Sincerely,
Assem Salama

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