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Model 7 and Model 8/[7:0] Registers
17
23913A/0—November 2000
Embedded AMD-K6™ Processors BIOS Design Guide
Preliminary Information
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
Description Comments
Machine-Check Address Register
MCAR
00h
page 16
Identical on all models
Machine-Check Type Register
MCTR
01h
page 16
Identical on all models
Test Register 12
TR12
0Eh
page 16
Identical on all models
Time Stamp Counter
TSC
10h
page 16
Identical on all models
Extended Feature Enable Register
EFER
C000_0080h
page 18
Write Handling Control Register
WHCR
C000_0082h
page 19
SYSCALL/SYSRET Target Address Register STAR
C000_0081h
page 22
Not supported on Model 7