* [Linux-ia64] /dev/rtc, regular interrupts
@ 2002-11-22 1:23 Peter Chubb
2002-11-22 18:55 ` David Mosberger
0 siblings, 1 reply; 2+ messages in thread
From: Peter Chubb @ 2002-11-22 1:23 UTC (permalink / raw)
To: linux-ia64
Hi,
Is there a way to get regular high-resolution timer interrupts
from 2.5.X linux on itanium or itanium2, similar to what one would
be able to get from /dev/rtc using the RTC_UIE_ON ioctl on an IA32
system?
Peter C
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Linux-ia64] /dev/rtc, regular interrupts
2002-11-22 1:23 [Linux-ia64] /dev/rtc, regular interrupts Peter Chubb
@ 2002-11-22 18:55 ` David Mosberger
0 siblings, 0 replies; 2+ messages in thread
From: David Mosberger @ 2002-11-22 18:55 UTC (permalink / raw)
To: linux-ia64
>>>>> On Fri, 22 Nov 2002 12:23:05 +1100, Peter Chubb <peter@chubb.wattle.id.au> 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
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