svn commit: r184146 - in head/sys: amd64/amd64 amd64/include i386/i386 i386/include

[John Baldwin]

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