pgd/pmd/pte and x86 kernel virtual addresses

[Timur Tabi <ttabi@interactivesi.com>]

On x86, when running the kernel, all memory is mapped with a simple offset. 
The virtual address is merely an offset from the physical address.

Does that mean that the pgd/pmd/pte tables are still used?  Basically, what I'm
trying to do is find the pte for a given physical page.  That is, I'm looking
for a function that looks like this:

pte_t *find_pte(mem_map_t *mm);

Given a pointer to a mem_map_t, it returns the pointer to the pte_t for that
physical page.  Is there such a function?  I've found things like this:

#define pte_offset(dir, address) ((pte_t *) pmd_page(*(dir)) + \
			__pte_offset(address))

but what value do I use for "dir"?




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Timur Tabi - ttabi@interactivesi.com
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