Intel 64 and IA-32 Architectures Software Developers Manual Volume 2A, Instruction Set Reference, A-M

3-166 Vol. 2
INSTRUCTION SET REFERENCE, A-M
80000001H EAX
EBX
ECX
EDX
Extended Processor Signature and Extended Feature Bits.
Reserved
Bit 0: LAHF/SAHF available in 64-bit mode
Bits 31-1 Reserved
Bits 10-0: Reserved
Bit 11: SYSCALL/SYSRET available (when in 64-bit mode)
Bits 19-12: Reserved = 0
Bit 20: Execute Disable Bit available
Bits 28-21: Reserved = 0
Bit 29: Intel
®
64 Technology available = 1
Bits 31-30: Reserved = 0
80000002H EAX
EBX
ECX
EDX
Processor Brand String
Processor Brand String Continued
Processor Brand String Continued
Processor Brand String Continued
80000003H EAX
EBX
ECX
EDX
Processor Brand String Continued
Processor Brand String Continued
Processor Brand String Continued
Processor Brand String Continued
80000004H EAX
EBX
ECX
EDX
Processor Brand String Continued
Processor Brand String Continued
Processor Brand String Continued
Processor Brand String Continued
80000005H EAX
EBX
ECX
EDX
Reserved = 0
Reserved = 0
Reserved = 0
Reserved = 0
Table 3-12. Information Returned by CPUID Instruction (Contd.)
Initial EAX
Value Information Provided about the Processor