Messages in this thread | | | Date | Fri, 25 Feb 2000 02:06:55 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: APIC and some timers stuff |
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On Thu, 24 Feb 2000, Artur Skawina wrote:
> > same. But the local APIC can be disabled on RESET in Pentium chips and by > > software means on P6 CPUs. Once disabled it cannot be enabled till the > > next RESET. > > p6_enable_apic() > { > unsigned rl, rh; > > rdmsr( 27, rl, rh ); > wrmsr( 27, rl^(1<<11), rh ); > }
does this always work? I believe there is some pin that disables the APIC permanently - is this really the case?
anyway, in 2.5 we can explore this stuff - right now we already have IO-APIC on UP, and a trivial patch enables compiling APIC support but no IO-APIC.
-- mingo
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