Re: Haswell CPU Feature

Hi Sean,

On Mon, Jan 5, 2015 at 6:34 PM, Sean Bruno <sbruno_at_ignoranthack.me> wrote:
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> On 01/05/15 17:50, Andrey Fesenko wrote:
>> On Tue, Jan 6, 2015 at 4:24 AM, Sean Bruno <sbruno_at_ignoranthack.me>
>> wrote:
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>>> On 01/05/15 16:57, Neel Natu wrote:
>>>> Congratulations, you have the ability to debug the Haswell
>>>> silicon
>>>>
>>> HA!
>>>
>>> Is this turned on purposefully (its a feature of the CPU) or is
>>> this turned on unintentionally and is a bug in manufacturing?
>>>
>>> sean
>>
>> My desktop i5-4570 contain this flag too
>>
>> Origin="GenuineIntel"  Id=0x306c3  Family=0x6  Model=0x3c
>> Stepping=3
>> 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=0x7ffafbff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,<b11>,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
>>
>>
> I'm thinking something like this:
>
> Index: sys/x86/x86/identcpu.c
> ===================================================================
> - --- sys/x86/x86/identcpu.c    (revision 276729)
> +++ sys/x86/x86/identcpu.c      (working copy)
> _at__at_ -781,7 +781,7 _at__at_
>                                 "\011TM2"       /* Thermal Monitor 2 */
>                                 "\012SSSE3"     /* SSSE3 */
>                                 "\013CNXT-ID"   /* L1 context ID available */
> - -                             "\014<b11>"
> +                               "\014SDBG"      /* IA32_DEBUG_INTERFACE debug*/
>                                 "\015FMA"       /* Fused Multiply Add */
>                                 "\016CX16"      /* CMPXCHG16B Instruction */
>                                 "\017xTPR"      /* Send Task Priority Messages*/
>
>

Looks good.

best
Neel

> sean
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