AMD AMD-K6-2/450 Design Guide - Page 72
Identifying the Processor’s Vendor, Table 28., CPUID Functions
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Preliminary Information Embedded AMD-K6™ Processors BIOS Design Guide 23913A/0-November 2000 for a value of at least 8000_0001h in the EAX register returned by function 8000_0000h. Within AMD's family of processors, different members can execute a different number of functions. Table 28 summarizes the CPUID functions currently implemented on AMD processors. 76 Table 28. CPUID Functions1 in AMD-K6™ Processors2 Standard Extended Function Function Description AMD-K6™E Processor (Model 7) 0 - Vendor String and Largest Standard Function Value X 1 - Processor Signature and Standard Feature Bits X - 8000_0000h Largest Extended Function Value X - 8000_0001h Extended Processor Signature Extended Feature Bits and X - 8000_0002h Processor Name X - 8000_0003h Processor Name X - 8000_0004h Processor Name X - 8000_0005h L1 TLB3 Cache Information X - 8000_0006h L2 TLB3 Cache Information - - 8000_0007h AMD PowerNow! Technology - Notes: 1. "Appendix A" on page 71 contains detailed descriptions of the functions. 2. Future versions of these processors may implement additional functions. 3. TLB = translation lookaside buffer 4. Low-power versions only AMD-K6™-2 and AMD-K6™-2E Processors (Model 8) X X X X X X X X - - AMD-K6™-2E+ and AMD-K6™-III AMD-K6™-IIIE+ Processor Processors (Model 9) (Model D) X X X X X X X X X X X X X X X X X X - X4 Identifying the Processor's Vendor Software must execute the standard function EAX=0. The CPUID instruction returns a 12-character string that identifies the processor's vendor. The instruction also returns the largest standard function input value defined for the CPUID instruction on the processor. For AMD processors, function 0 returns a vendor string of "AuthenticAMD". This string informs the software to follow 60 Embedded AMD Processor Recognition