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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>
This commit is contained in:
Suresh Siddha
2008-08-23 17:47:10 +02:00
committed by Ingo Molnar
parent 87ce786ae5
commit bbb65d2d36
6 changed files with 104 additions and 3 deletions
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include/asm-x86/processor.h
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@ -161,6 +161,7 @@ extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
extern unsigned short num_cache_leaves;
extern void detect_extended_topology(struct cpuinfo_x86 *c);
#if defined(CONFIG_X86_HT) || defined(CONFIG_X86_64)
extern void detect_ht(struct cpuinfo_x86 *c);
#else