p4tcc.c from FreeBSD

[Jeroen Ruigrok/asmodai]

Matt,

-On [20040727 01:12], Matthew Dillon (dillon at xxxxxxxxxxxxxxxxxxxx) wrote:
>    With that said I think it would be fine for the p4tcc patch
>    to be committed.  I do not think it would interfere with the
>    other work either and we might learn something by playing with
>    it in the mean time.

Given this snippet of code:

if ((cpu_feature & (CPUID_ACPI | CPUID_TM)) != (CPUID_ACPI | CPUID_TM))   
	return;

Should I make it enabled by default?

CPU: Intel(R) Pentium(R) 4 CPU 1.60GHz (1594.80-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf12  Stepping = 2
  Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM>

You see at the end of the features line the TM feature.

Contrast this to:

CPU: Pentium II/Pentium II Xeon/Celeron (374.06-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x665  Stepping = 5
  Features=0x183fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>

CPU: AMD Duron(tm) Processor (1194.92-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x671  Stepping = 1
  Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
  AMD Features=0xc0400000<AMIE,DSP,3DNow!>

CPU: AMD Athlon(tm) XP 1800+ (1528.99-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x662  Stepping = 2
  Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
  AMD Features=0xc0480000<MP,AMIE,DSP,3DNow!>

Neither one has TM.

-- 
Jeroen Ruigrok van der Werven <asmodai(at)wxs.nl> / asmodai / kita no mono
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