Re: [PATCH] RTC: Add mmap method to rtc character driver

H. Peter Anvin
2006-07-25T19:10:00Z

Arjan van de Ven wrote:
>
> well the idea that has been tossed about a few times is using a vsyscall
> function that either calls into the kernel, or directly uses the hpet
> page (which can be user mapped) to get time information that way...
> or even would use rdtsc in a way the kernel knows is safe (eg corrected
> for the local cpu's speed and offset etc etc).
>

x86-64 already does that, IIRC.

-hpa