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630 AMD Geode™ LX Processors Data Book
Instruction Set
33234H
Table 8-21. CPUID Instruction Codes with EAX = 80000001h
Register Reset Value Description Comment
EAX[31:28] 0x0 Reserved
EAX[27:20] 0x00 Extended Family
EAX[19:16] 0x00 Extended Model
EAX[15:12] 0x0 Reserved
EAX[11:8] 0x5 Processor/Instruction Family
EAX[7:4] 0x5 Processor Model
EAX[3:0] 0x2 Processor Stepping May change with CPU revision
EDX[31] 1 3DN. 3DNow! Instruction Set
EDX[30] 1 3DE. 3DNow! Instruction Set Extension
EDX[29] 0 LM. Long mode Not supported
EDX[28:25] 0000 Reserved Not supported
EDX[24] 0 FXSR/FXRSTOR. Fast FP Save and Restore Not supported
EDX[23] 1 MMX. MMX Instruction Set and Architecture
EDX[22] 1 AMMX. AMD MMX Instruction Extension
EDX[21] 0 Reserved
EDX[20] 0 NX. No-execute page protection Not supported
EDX[19] 0 MP. Multiprocessing capability Not supported
EDX[18] 0 Reserved
EDX[17] 0 PSE36. 36-Bit Page Size Extensions Not supported
EDX[16] 0 PAT. Page Attribute Table Not supported
EDX[15] 1 CMOV. Conditional Move Instruction (CMOV,
FCMOV, FCOMI)
EDX[14] 0 MCA. Machine Check Architecture Not supported
EDX[13] 1 PGE. Page Global Enable Feature
EDX[12] 0 MTRR. Memory Type Range Registers Not supported
EDX[11] 0 ASEP. Syscall/Sysret Instruction
EDX[10] 0 Reserved
EDX[9] 0 APIC. Advanced Programmable Interrupt Control-
ler
Not supported
EDX[8] 1 CX8. Compare Exchange (CMPXCHG8B)
Instruction
EDX[7] 0 MCE. Machine Check Exception Not supported
EDX[6] 0 PAE. Page Address Extension Not supported
EDX[5] 1 MSR. Model Specific Registers via
RDMSR/WRMSR Instructions
EDX[4] 1 TSC. Time Stamp Counter and RDTSC
Instruction
EDX[3] 1 PSE. 4MB Page Size Extension
EDX[2] 1 DE. Debugging Extension
EDX[1] 0 VME. Virtual Interrupt Flag in VM86 Not supported
EDX[0] 1 FPU. Floating Point Unit On Chip