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AMD64 Technology 24594 Rev. 3.10 February 2005Table 3-7.CPUID AMD Feature Support (Extended Function 8000_0001h—EDX) (continued)EDXBitFeature(feature is supported if bit is set to 1)Same asFunction 1(Table 3-5) 17 Machine Check Exception. See “Handling Machine Check Exceptions” in Volume 2. yes8 CMPXCHG8B Instruction. yes9Advanced Programmable Interrupt Controller (APIC). BIOS must enable the local APIC.See the documentation for particular implementations of the architecture.yes10 Reserved. no1112SYSCALL and SYSRET Instructions. These instructions have different implementationsthan the SYSENTER and SYSEXIT instructions indicated by bit 11 of standard function 1. Foradditional information, see “Fast System Call and Return” in Volume 2.Memory-Type Range Registers (MTRRs). See “Memory-Type Range Registers” inVolume 2.noyes13 Page Global Extension. See “Global Pages” in Volume 2. yes14 Machine Check Architecture. See “Machine Check Mechanism” in Volume 2. yes15Conditional Move Instructions. Indicates support for conditional move (CMOVcc) generalpurposeinstructions, and—if the on-chip x87-instruction-unit bit (bit 0) is also set—for thex87 floating-point conditional move (FCMOVcc) instructions.yes16 Page Attribute Table (PAT). See “Memory-Type Range Registers” in Volume 2. yes17 Page-Size Extensions (PSE). See “Page-Size Extensions (PSE) Bit” in Volume 2. yes18–19 Reserved. no20 No-Execute Page Protection. See “No Execute (NX) Bit” in Volume 2. no21 Reserved. no2223AMD Extensions to MMX Instructions. Indicates support for the AMD extensions to theinteger (MMX) 64-bit media instructions, including support for certain SSE and SSE2instructions. See Appendix D, “Instruction Subsets and CPUID Feature Sets,” for details.MMX Instructions. Indicates support for the integer (MMX) 64-bit media instructions. Fordetails, see Appendix D, “Instruction Subsets and CPUID Feature Sets.”noyes24 FXSAVE and FXRSTOR Instructions. See “FXSAVE and FXRSTOR Instructions” in Volume 2. yes25 Fast FXSAVE/FXRSTOR. See "FXSAVE and FXRSTOR Instructions" in Volume 2. noNote: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.128 CPUID
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable 3-7.CPUID AMD Feature Support (Extended Function 8000_0001h—EDX) (continued)EDXBit26 Reserved.Feature(feature is supported if bit is set to 1)Same asFunction 1(Table 3-5) 127 RDTSCP Instruction. no28 Reserved.29 Long Mode. See “Long Mode” in Volume 2. no3031AMD Extensions to 3DNow! Instructions. Indicates support for the AMD extensions tothe floating-point (3DNow!) 64-bit media instructions. For details, see Appendix D,“Instruction Subsets and CPUID Feature Sets.”AMD 3DNow! Instructions. Indicates support for the floating-point (3DNow!) 64-bitmedia instructions. For details, see Appendix D, “Instruction Subsets and CPUID FeatureSets.”nonoNote: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.Extended Functions8000_0002h–8000_0004h:Processor NameExtended functions 8000_0002h, 8000_0003h, and 8000_0004h together return anASCII string containing the name of the processor implementation. Software cansimply call these three functions in numerical order to obtain a 48-character ASCIIname string. Although the name string can be up to 48 characters in length, shorternames have unused byte locations filled with the ASCII null character (00h).Note: The BIOS must program the name string before these functions are executed;otherwise, these functions return the default processor name string (48 ASCIInull characters).The name string returned by these functions is in little-endian format. Extendedfunction 8000_0002h returns the first 16 characters of the name and extendedfunction 8000_0004h returns the last 16 characters. For each of the three groups of 16characters, the functions return the name (in order of least-significant to mostsignificantbyte) in the EAX, EBX, ECX, and EDX registers. The first character residesin the least-significant byte of EAX, and the last character resides in the mostsignificantbyte of EDX.CPUID 129
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