svn commit: r184146 - in head/sys: amd64/amd64 amd64/include
i386/i386 i386/include
John Baldwin
jhb at freebsd.org
Wed Oct 22 15:04:41 UTC 2008
On Tuesday 21 October 2008 08:01:53 pm Jung-uk Kim wrote:
> Author: jkim
> Date: Wed Oct 22 00:01:53 2008
> New Revision: 184146
> URL: http://svn.freebsd.org/changeset/base/184146
>
> Log:
> Set kern.timecounter.invariant_tsc to 1 for AMD CPU family 10h and higher
> even if BIOS does not advertise it.
>
> Modified:
> head/sys/amd64/amd64/identcpu.c
> head/sys/amd64/include/specialreg.h
> head/sys/i386/i386/identcpu.c
> head/sys/i386/include/specialreg.h
>
> Modified: head/sys/amd64/amd64/identcpu.c
>
==============================================================================
> --- head/sys/amd64/amd64/identcpu.c Tue Oct 21 23:36:28 2008 (r184145)
> +++ head/sys/amd64/amd64/identcpu.c Wed Oct 22 00:01:53 2008 (r184146)
> @@ -348,7 +348,9 @@ printcpuinfo(void)
> cpu_feature &= ~CPUID_HTT;
>
> if (!tsc_is_invariant &&
> - (amd_pminfo & AMDPM_TSC_INVARIANT)) {
> + (strcmp(cpu_vendor, "AuthenticAMD") == 0 &&
> + ((amd_pminfo & AMDPM_TSC_INVARIANT) != 0 ||
> + AMD64_CPU_FAMILY(cpu_id) >= 0x10))) {
> tsc_is_invariant = 1;
> printf("\n P-state invariant TSC");
> }
Perhaps a simpler approach might be to just set AMDPM_TSC_INVARIANT for
AMD64_CPU_FAMILY(cpu_id) >= 0x10?
--
John Baldwin
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