On Tue, Jul 13, 2010 at 05:39:11PM +0800, Samuel Xu wrote: > I tried hpet_readl() from my driver code, while hit compiling error. > is it a correct API for kernel driver to invoke? any more hint? > What are you trying to do exactly? Using TSC or HPET is not platform-independent. You may take a look at hrtimers. Regards, Cascardo. > 2010/7/13 Samuel Xu <samuel.xu.tech@xxxxxxxxx>: > > HI: > > I am a freshman for HPET timer. Previously, I use TSC counter, to use > > rdtsc to get the time stamp. elapsed cycle can be counter from 2 time > > stamps. > > As a advanced replacement of TSC, I suppose HPET timer can be > > conveniently to read time stamp from both kernel mode user and user > > mode apps. > > While I failed to find a way to get time stamp value of HPET in Linux > > kenerl (I am doing a driver and want to know elapsed cycle from driver > > code). > > > > Anyone can help me? > > > > Thanks! > > > > Samuel > > > -- > To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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