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Vol. 2A 3-167
INSTRUCTION SET REFERENCE, A-M
CPUID—CPU Identification
EDX 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
80000006H EAX
EBX
Reserved = 0
Reserved = 0
ECX
EDX
Bits 7-0: Cache Line size in bytes
Bits 15-12: L2 Associativity field *
Bits 31-16: Cache size in 1K units
Reserved = 0
NOTES:
* L2 associativity field encodings:
00H - Disabled
01H - Direct mapped
02H - 2-way
04H - 4-way
06H - 8-way
08H - 16-way
0FH - Fully associative
Table 3-12. Information Returned by CPUID Instruction (Contd.)
Initial EAX
Value Information Provided about the Processor