user virtual address to physical address

user virtual address to physical address

[Fredrick]

Hi,

I need to convert a user virtual address to its
corresponding physical address.
I know that if the virtual address is from kernel,
we could use virt_to_phys.
Is there a similar helper function
to convert user virtual address.?

Thanks,
Fredrick

user virtual address to physical address

[Chetan Nanda]

On Wed, May 9, 2012 at 5:40 AM, Fredrick <fjohnber@zoho.com> wrote:

> Hi,
>
> I need to convert a user virtual address to its
> corresponding physical address.
> I know that if the virtual address is from kernel,
> we could use virt_to_phys.
> Is there a similar helper function
> to convert user virtual address.?
>
> Hi Fredrick,

Please elaborate the purpose,

User-space application allowed to have virtual address upto 3GB, assuming
1:3 address space split.
And its not mandatory for all user-space address to be valid and to have
all user-space address to have a valid physical address mapping.


Thanks,
Chetan

Thanks,
> Fredrick
>
>
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