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Old 04-20-2011, 03:21 AM   #1
Joe Loos
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Registered: Feb 2011
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Is there a way to insert an arbitrary virtual to physical address mapping?


I have a physical page that is not in the efi mem map. So its not known to linux/not mapped as a kernel page.

I'd like to map it in the hardware tables, from my kernel module, so I can access it from my kernel module.

Is there an interface in linux that can do this?

I see in arch/ia64/mm/init.c the internal interfaces pgd_offset_k(), pud_alloc(), pmd_alloc(), pte_alloc_kernel(), mk_pte(), and set_pte() are used to create mappings.

However, these internal interfaces are not exported for kernel modules to use.

Alternatively, I can pick a page that is reported in the efi mem map and mapped by arch/ia64/kernel/efi.c, for example, one of the PAL pages, then I can access it from my kernel module. However, I'd prefer the ability to insert arbitrary mappings.
 
Old 04-20-2011, 08:58 PM   #2
Joe Loos
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The ioremap() interface does what I want. It maps my phys page to a virt addr in the ioremap virt addr range that I can use to access the page from my kernel module.
 
  


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