MOV EAX, 80000000H
CPUID
After the execution of the CPUID instruction, a return value will be present in the EAX register. Always use an EAX parameter value that is equal to or greater than 80000000h and less than or equal to this highest EAX “returned” value. On current and future IA-32 processors, bit 31 in the EAX register will be clear when CPUID is executed with an input parameter greater than the highest value for either set of functions, and when the extended functions are not supported. All other bit values returned by the processor in response to a CPUID instruction with EAX set to a value higher than appropriate for that processor are model specific and should not be relied upon.
我的英语太烂了,泪奔。。。。。