Re: Haswell CPU Feature

Hi Sean,

On Mon, Jan 5, 2015 at 4:46 PM, Sean Bruno <sbruno_at_ignoranthack.me> wrote:
>
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>   "\014<b11>"
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>
> I don't know what this cpu feature2 flag means, but my x240 haswell
> laptop has a "b11" feature2 set.
>
> sean
>
> dmesg | grep -i features
>
> Features=0xbfebfbff<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,PBE>
>
> Features2=0x7ffafbbf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,<b11>,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>

Congratulations, you have the ability to debug the Haswell silicon :-)

>From the Intel SDM, "Table 3-20. Feature Information Returned in the
ECX Register"

11 | SDBG | A value of 1 indicates the processor supports
IA32_DEBUG_INTERFACE MSR for silicon debug.

best
Neel

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