x86: use cpuid vector 0xb when available for detecting cpu topology

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cpuid leaf 0xb provides extended topology enumeration. This interface provides
the 32-bit x2APIC id of the logical processor and it also provides a new
mechanism to detect SMT and core siblings (which provides increased
addressability).

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Suresh Siddha 2008-08-23 17:47:10 +02:00 • committed by Ingo Molnar

parent 87ce786ae5

commit bbb65d2d36

6 changed files with 105 additions and 4 deletions

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1

include/asm-x86/cpufeature.h

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include/asm-x86/processor.h

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