Messages in this thread | | | From | Andi Kleen <> | Subject | Re: Timer Selection | Date | Sun, 10 Sep 2006 15:51:11 +0200 |
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On Sunday 10 September 2006 12:34, Dong Feng wrote: > In i386 architecture, there are five timers as candidates in the selection > of "cur_timer." I feel among the five only two types can be used as Kernel > base timer, HPET and PIT. Kernel base timer is the timer trigger > timer_interrupt() periodically. Namely, the timer installed on IRQ 0 in > i386 architecture. > > Is the above understanding correct? Particularly I want to confirm which > timers can be used as Kernel base timer.
Only HPET and PIT can be interrupt 0 in the PC architecture (HPET only if the legacy option is available), but there is no reason the main timer handler cannot be driven from another interval timer (e.g. x86-64 offers the APIC timer as a option for this)
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