Hi, Cascardo: Thanks for reply! I just want to get the guide on some sample code of HPET usage invoked from kernel mode driver. Any directly guide? Thanks! 2010/7/13 Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxxx>: > 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 > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (GNU/Linux) > > iQIcBAEBAgAGBQJMPGVTAAoJEEWxSg7udFZIZHoQAKj0xOvvtE5pEZqau1OnFz1t > q15VC2q/OYQRRjAT5kRFEfWk7NcCaJmw4Y0TdrOjEW9YpYnZARksH2UwFA8myf9g > WOUpRe0o3HcuiutlxB321bI7mpJLHAaxpFwB8/10iXGjrH0LUQeOWkNo5smd9RQK > 1WfQ6BVEOqeyfY9ISnwzqhZQMu3AG0DbqnZQe6QtvE4Epg4L8ZeROL1piJqLGtlv > IGQ4fn+Pdu9+VXpmVl4Uzc/bLF1j2HTTKwwHO0KHTYZty40K8NnbCPJJp00KTfnN > TYVdEEgWzvIrJmB7hlrdl5gmjs9KYmOe3lpkRdotCzca9VNxFLvyi6ogkE/qiLpY > Au8wts22+qikxAkHdDfFdlnYAiiguGCJvku2usCtkEbTxsYWHKp/maP8xcNDE52H > HHwKmkKuYA/m+ML7kKmE7goDHjFvG0SZcm8Gjj4ghxbobhzQ6XGxzsGpJ9GwYz/E > JqAiqob3lD8TljWXPGN839pi0KHBivH71p9UoCC856G3GL4nXahsBSwMMg3KWj5i > avvQSCR838LK7qesKYak3xgjmLl9vRWVQwbx1vIlgjpOsBnmhUttUOKFy1eb4THz > EX080354M5mVfXsoiDVqUy3W5PwL1Yna9AaMVk+05lKg6OR/b0cMC6PFocGkgxRM > Okd0gXuUGv5IIy38UGSO > =BMoU > -----END PGP SIGNATURE----- > > -- 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
