Arjan van de Ven wrote:
Actually, we need to ask the CPU/System makers to provide a system wide
timer that is independent of the given CPU. I would expect it quite simple
they exist. They're called pmtimer and hpet.
pmtimer is port io. hpet is memory mapped io.
Thanks for the info. I took a look at Documentation/hpet.txt and drivers/char/hpet.c
and see that hpet_mmap is implemented in the driver but nothing hpet.txt indicates
what is being mapped.
Could you point me to any other documentation? I did find the following:
http://www.intel.com/hardwaredesign/hpetspec_1.pdf
Are you aware of any example user code that uses the mmap capability of hpet?
Thanks,
Wink
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