On Wed, Jun 26, 2013 at 08:37:35PM -0400, Christos Zoulas wrote:
> Module Name: src
> Committed By: christos
> Date: Thu Jun 27 00:37:35 UTC 2013
>
> Modified Files:
> src/sys/arch/x86/x86: tsc.c
>
> Log Message:
> detect a bad msr tsc and don't use it.
+ tsc_good = (cpu_feature[0] & CPUID_MSR) != 0 && rdmsr(MSR_TSC) != 0;
There is a very small chance that the TSC will read as zero.
So the check should probably be:
tsc_good = (cpu_feature[0] & CPUID_MSR) != 0 &&
(rdmsr(MSR_TSC) != 0 || rdmsr(MSR_TSC) != 0);
The:
+extern int cpu_msr_tsc;
looks bogus - debug ??
David
--
David Laight: da...@l8s.co.uk
