AMD AMD-K6-2/450 Design Guide - Page 29
Model 7 and Model 8/[7:0] Registers
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23913A/0-November 2000 Preliminary Information Embedded AMD-K6™ Processors BIOS Design Guide Model 7 and Model 8/[7:0] Registers The AMD-K6E processor Model 7 and the AMD-K6-2 processor Model 8/[7:0] provide the model-specific registers listed in Table 9. The contents of ECX selects the MSR to be addressed by the RDMSR and WRMSR instruction. Table 9. Model-Specific Registers Supported by Models 7 and 8/[7:0] Register Name Mnemonic ECX Value Machine-Check Address Register MCAR 00h Machine-Check Type Register MCTR 01h Test Register 12 TR12 0Eh Time Stamp Counter TSC 10h Extended Feature Enable Register EFER C000_0080h Write Handling Control Register WHCR C000_0082h SYSCALL/SYSRET Target Address Register STAR C000_0081h Description Comments page 16 Identical on all models page 16 Identical on all models page 16 Identical on all models page 16 Identical on all models page 18 page 19 page 22 Not supported on Model 7 Model 7 and Model 8/[7:0] Registers 17