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GX1 Datasheet(PDF) 220 Page - National Semiconductor (TI) |
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GX1 Datasheet(HTML) 220 Page - National Semiconductor (TI) |
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220 / 247 page  www.national.com 220 Revision 1.0 Instruction Set (Continued) 8.2.2 Extended CPUID Levels Testing for extended CPUID instruction support can be accomplished by executing a CPUID instruction with the EAX register initialized to 80000000h. If a value greater than or equal to 80000000h is returned to the EAX regis- ter by the CPUID instruction, the processor supports extended CPUID levels. 8.2.2.1 CPUID Instruction with EAX = 8000 0000h Extended function 80000000h (EAX = 80000000h) of the CPUID instruction returns the maximum extended CPUID levels supported by the current processor in EAX (Table 8- 21). The EBX, ECX, and EDX registers are currently reserved. 8.2.2.2 CPUID Instruction with EAX = 80000001h Extended function 80000001h (EAX = 80000001h) of the CPUID instruction returns the processor type, family, model, and stepping information of the current processor in EAX. The EBX and ECX registers are reserved. The extended feature flags supported are returned in the EDX register as shown in Table 8-23. Each flag refers to a specific feature and indicates if that feature is present on the processor. Some of these features have protection control in CR4. Before using any of these features on the processor, the software should check the corresponding feature flag. Table 8-21. Maximum Extended CPUID Level Register Returned Contents Description EAX 8000 0005h Maximum Extended CPUID Level (six levels) EBX - Reserved ECX - Reserved EDX - Reserved Table 8-22. EAX, EBX, ECX CPUID Data Returned when EAX = 80000001h Register Returned Contents Description EAX[3:0] xx Stepping ID EAX[7:4] 4 Model EAX[11:8] 5 Family EAX[15:12] 0 Processor Type EAX[31:16] - Reserved EBX - Reserved ECX - Reserved Table 8-23. EDX CPUID Data Returned when EAX = 80000001h EDX Returned Contents1 1. 0 = Not supported Feature Flag CR4 Bit EDX[0] 1 FPU On-Chip - EDX[1] 0 Virtual Mode Extension - EDX[2] 0 Debugging Extension - EDX[3] 0 Page Size Extension (4 MB) - EDX[4] 1 Time Stamp Counter 2 EDX[5] 1 Model-Specific Registers (via RDMSR / WRMSR Instructions) - EDX[6] 0 Reserved - EDX[7] 0 Machine Check Exception - EDX[8] 1 CMPXCHG8B Instruction - EDX[9] 0 Reserved - EDX[10] 0 Reserved - EDX[11] 0 SYSCALL / SYSRET Instruction - EDX[12] 0 Reserved - EDX[13] 0 Page Global Enable - EDX[14] 0 Reserved - EDX[15] 1 Integer Conditional Move Instruction - EDX[16] 0 FPU Conditional Move Instruction - EDX[22:17] 0 Reserved - EDX[23] 1 MMX - EDX[24] 1 6x86MX Multimedia Extensions - |
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