virt_to_phys for ioremap'd memory

virt_to_phys for ioremap'd memory

[Timur Tabi]

Can anyone help me figure out how to do virtual->physical translation on memory
obtained via ioremap()?  I know that you need to have the physical address in
order to call ioremap(), but I don't want to have to remember the physical
address for all the memory blocks that I allocate via ioremap().  It'd be a lot
easier for me to do virt->phys translations on the virtual addresses whenever I
needed them.

I know it has something to do with walking the pgd/pmd/pte chain, but even
after looking at the kernel source code, I can't make heads or tails of it.

Thanks!


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Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com

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Re: virt_to_phys for ioremap'd memory

[Jeff Garzik]

On Mon, 25 Sep 2000, Timur Tabi wrote:

> Can anyone help me figure out how to do virtual->physical translation on memory
> obtained via ioremap()?  I know that you need to have the physical address in
> order to call ioremap(), but I don't want to have to remember the physical
> address for all the memory blocks that I allocate via ioremap().  It'd be a lot
> easier for me to do virt->phys translations on the virtual addresses whenever I
> needed them.
> 
> I know it has something to do with walking the pgd/pmd/pte chain, but even
> after looking at the kernel source code, I can't make heads or tails of it.

Instead of worry about that stuff, bite the bullet and remember the
physical addresses... :)

	Jeff



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