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AMD64 Technology 24594 Rev. 3.10 February 2005field, the BIOS uses the 12-bit brand ID field to program the processor name stringthat is returned by extended functions 8000_0002h–8000_0004h. If the 8-bit brand IDfield is 0 (the value in EBX returned by standard function 1), then the 12-bit brand IDis used to program the processor name string. For more information on the 8-bit brandID, see “Standard Function 1 EBX: Initial APIC ID, Logical Processor Count,CLFLUSH Size, and 8-Bit Brand ID” on page 121.Figure 3-3 shows the format of the EBX register following execution of CPUIDextended function 8000_0001h.31 12 11 0Reserved12-Bit Brand IDBits Mnemonic Description31–12 Reserved11–0 12-Bit Brand IDFigure 3-3.Extended Function 8000_0001h EBX: 12-bit Brand IDFor information on using the 12-bit brand ID to program the processor name string,see the AMD Processor Recognition Application Note, order# 20734.Extended Function 8000_0001h ECX: AMD Feature Support. Extended function 8000_0001hreturns information about AMD features—those features that were originallyimplemented by AMD—in the ECX and EDX registers. The value of each bit returnedindicates whether support for a specific feature is present on the processorimplementation. If the value of a bit is 1, the feature is supported. If the value is 0, thefeature is not supported.Table 3-6 summarizes the feature bits returned in the ECX register by CPUIDextended function 8000_0001h.Table 3-6.ECX BitCPUID AMD Feature Support (Extended Function 8000_0001h—ECX)Feature(feature is supported if bit is set to 1)0 LAHF/SAHF Supported in 64-Bit Mode.1CMP Legacy. The HTT (Hyperthreading Technology) feature bit and the logical processor count field(returned in EBX by standard function 1) indicate multiple cores in the package instead of hyperthreading.(See “Logical Processor Count” on page 122.)126 CPUID
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable 3-6.ECX BitCPUID AMD Feature Support (Extended Function 8000_0001h—ECX) (continued)Feature(feature is supported if bit is set to 1)2–3 Reserved.4 CR8 Available in Legacy Mode. (See “MOV(CRn)” on page 329.)5–31 Reserved.Extended Function 8000_0001h EDX: AMD Feature Support. Extended function 8000_0001hreturns information about AMD features in the EDX register. Extended function8000_0001h also duplicates some of the standard-feature bits from standardfunction 1 in the EDX register, but this practice is outdated. Any new feature that isfirst implemented by a given vendor is now reported only by a function assigned tothat vendor.Table 3-7 on page 127 summarizes the feature bits returned in the EDX register forextended function 8000_0001h. The right-most column of this table indicates whethera given bit has the same meaning when returned by standard function 1. If the bit hasthe same meaning, use CPUID standard function 1 to test whether the feature issupported. For a list of the feature bits returned by standard function 1, see Table 3-5on page 123.Table 3-7.EDXBitCPUID AMD Feature Support (Extended Function 8000_0001h—EDX)Feature(feature is supported if bit is set to 1)Same asFunction 1(Table 3-5) 10 On-Chip x87-Instruction Unit. yes1 Virtual-Mode Extensions. See “Virtual Interrupts” in Volume 2. yes2 Debugging Extensions. See “Software-Debug Resources” in Volume 2. yes3 Page-Size Extensions (PSE). See “Page-Size Extensions (PSE) Bit” in Volume 2. yes4 Time-Stamp Counter. See “Time-Stamp Counter” in Volume 2. yes56AMD K86 Model-Specific Registers (MSRs), with RDMSR and WRMSR Instructions. See“Model-Specific Registers (MSRs)” in Volume 2.Physical-Address Extensions (PAE). See “Physical-Address Extensions (PAE) Bit” inVolume 2.yesyesNote:1. If a bit has the same meaning for function 1 as it does for function 8000_0001h, the processor sets or clears the bit identicallyfor both functions.CPUID 127
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