Re: Getting the physical page for a kernel virtual address

[Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>]

Hi Katelyn...

> Given a kernel virtual address in the range 0xC0000000 - 0xFFFFFFFF, is
> it possible to walk the page tables to get the physical page
> corresponding to that address? For example, I tried the following:
>   
Since kernel virtual address is an identity mapping of physical address,
have you tried virt_to_phys()?

>         unsigned long addr = PAGE_OFFSET|0x00100000;
>
>         pgd = pgd_offset(&init_mm, addr);
>   
Interesting. You try to hit 0xC010000 which is related to phys address
0x00100000, but in reality (assuming your codes are correct, since I see
no mistake so far) you get no related page table entry. Have you tried
another virtual address?

regards,

Mulyadi



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