On Mon, Jan 15, 2018 at 6:57 AM, Greentime Hu <[email protected]> wrote:
> From: Rick Chen <[email protected]>
>
> VDSO needs real-time cycle count to ensure the time accuracy.
> Unlike others, nds32 architecture does not define clock source,
> hence VDSO needs atcpit100 offering real-time cycle count
> to derive the correct time.
>
> Signed-off-by: Vincent Chen <[email protected]>
> Signed-off-by: Rick Chen <[email protected]>
> Signed-off-by: Greentime Hu <[email protected]>
I'm a bit puzzled by this patch, can you explain how the vdso actually
manages to access the clock hardware? It looks like you make the
physical address and the register offset available to user space, but
how does it end up accessing it?
Arnd
