Haswell CPU Feature
Sean Bruno
sbruno at ignoranthack.me
Tue Jan 6 02:34:45 UTC 2015
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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)
@@ -781,7 +781,7 @@
"\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*/
sean
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