p4tcc.c from FreeBSD

Jeroen Ruigrok/asmodai asmodai at wxs.nl
Tue Jul 27 03:35:31 PDT 2004


-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))   

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

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

CPU: AMD Duron(tm) Processor (1194.92-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x671  Stepping = 1
  AMD Features=0xc0400000<AMIE,DSP,3DNow!>

CPU: AMD Athlon(tm) XP 1800+ (1528.99-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x662  Stepping = 2
  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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