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AMD64 Technology 24594 Rev. 3.10 February 2005Extended Function8000_0006h: L2Cache and TLBInformationExtended function 8000_0006h returns information about the L2 cache integrated onthe processor. Tables 3-13, 3-14, and 3-15 on page 133 show the register-contentformats for the information returned by extended function 8000_0006h.In these tables, the associativity field is encoded as follows:• 00h—The L2 cache is off (disabled).• 01h—Direct mapped.• 02h—2-way associative.• 04h—4-way associative.• 06h—8-way associative.• 08h—16-way associative.• 0Fh—Fully associative.• All other encodings are reserved.Table 3-13.RegisterCPUID L2 TLB Bits for 2-Mbyte and 4-Mbyte Pages (Extended Function 8000_0006—EAX)L2 Data TLB L2 Instruction or Unified L2 TLB 1Associativity Number of Entries 2 Associativity Number of Entries 2EAX Bits 31–28 Bits 27–16 Bits 15–12 Bits 11–0Notes:1. The presence of a unified L2 TLB is indicated by a value of 0000h in the upper 16 bits of the EAX register. The unified L2 TLBinformation is contained in the lower 16 bits of the EAX register.2. The number of entries returned is the number of entries available for the 2-Mbyte page size. The 4-Mbyte pages may require two2-Mbyte entries, depending on the implementation, so the number of entries available for the 4-Mbyte page size would be onehalfthe returned value.Table 3-14.RegisterCPUID L2 TLB Bits for 4-Kbyte Pages (Extended Function 8000_0006—EBX)L2 Data TLB L2 Instruction or Unified L2 TLB 1Associativity Number of Entries Associativity Number of EntriesEBX Bits 31–28 Bits 27–16 Bits 15–12 Bits 11–0Note:1. The presence of a unified L2 TLB is indicated by a value of 0000h in the upper 16 bits of the EBX register. The unified L2 TLBinformation is contained in the lower 16 bits of the EBX register.132 CPUID
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable 3-15.CPUID L2 Cache Bits(Extended Function 8000_0006—ECX)RegisterExtended Function 8000_0006h EDX. For extended function 8000_0006h, the EDX registeris reserved.Extended Function8000_0007h:Advanced PowerManagementFeaturesL2 CacheSize (Kbytes) Associativity Lines Per Tag Line Size (Bytes)ECX Bits 31–16 Bits 15–12 Bits 11–8 Bits 7–0Extended Function 8000_0007h returns information about the advanced-powermanagementfeatures supported by the processor.Extended Function 8000_0007h EAX, EBX, and ECX. For extended function 8000_0007h, theEAX, EBX, and ECX registers are reserved.Extended Function 8000_0007h EDX. Extended function 8000_0007h returns informationabout advanced-power-management features in the EDX register. Figure 3-4 shows theformat of the EDX register following execution of CPUID extended extendedfunction 8000_0007h. Each bit indicates whether support for a specific feature ispresent on the processor implementation. If the value of a power-management-featurebit is 1, the feature is supported. If the value is 0, the feature is not supported.31 6 5 4 3 2 1 0ReservedSTCTMTTPVIDFIDTSBits Mnemonic Description31–6 Reserved5 STC Software Thermal Control4 TM Thermal Monitoring3 TTP Thermal Trip2 VID Voltage ID Control1 FID Frequency ID Control0 TS Temperature SensorFigure 3-4.Register)Extended Function 8000_0007h EDX: Advanced Power Management Features (EDXCPUID 133
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