The cpu cpuid command executes the x86 CPU Identification (CPUID) instruction given EAX and optional ECX. EAX and ECX are x86 general purpose execution registers. See the Intel 64 and IA-32 Architectures Software Developer's Manual or any x86 assembly language manual for information on how to use the CPU Identification instruction.
Without EAX, this command displays Brand String embedded in CPUID EAX of 80000002h-80000005h.
udiag cpu cpuid <EAX> [<ECX>]
udiag cpu cpuid
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ONE_AP_OR_BSP; ONE_INSTANCE_ONLY
To display Brand string, type:
fs0:/> udiag cpu cpuid
To execute CPUID with EAX=4 and ECX=2 (level 2 cache information), type:
fs0:> udiag cpu cpuid 4 2