From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Fri, 22 Nov 2002 18:55:35 +0000 Subject: Re: [Linux-ia64] /dev/rtc, regular interrupts Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Fri, 22 Nov 2002 12:23:05 +1100, Peter Chubb said: Peter> Hi, Is there a way to get regular high-resolution timer Peter> interrupts from 2.5.X linux on itanium or itanium2, similar Peter> to what one would be able to get from /dev/rtc using the Peter> RTC_UIE_ON ioctl on an IA32 system? ia64 is legacy-free so there is no guarantee that the old timer chip is there (it isn't on hp's zx1-platforms, for example). The EFI real time interface doesn't provide for fine-grained timers, but the high precision event timer (HPET) does. However, HPET is not widely implemented yet in today's hardware. Depending on what you want to do, the PMU could also be used as a high-precision timer. --david