
44
Software Environment
Chapter 3
AMD-K6-2E+ Embedded Processor Data Sheet
23542A/0—September 2000
Preliminary Information
3.2
Model-Specific Registers (MSR)
The AMD-K6-2E+ processor provides eleven Model-Specific
Registers (MSRs) in the standard-power versions and twelve
MSRs in the low-power versions.
I
The value in the ECX register selects the MSR to be
addressed by the RDMSR and WRMSR instructions.
The values in EAX and EDX are used as inputs and outputs
by the RDMSR and WRMSR instructions.
I
Table 5 lists the MSRs and the corresponding value of the ECX
register. Figures 30 through 43 starting on page 45 show the
MSR formats.
For more information about the MSRs, see the
Embedded
AMD-K6 Processors BIOS Design Guide Application Note
, order#
23913.
For more information about the RDMSR and WRMSR
instructions, see the
AMD K86 Family BIOS and Software Tools
Development Guide
, order# 21062.
Table 5.
AMD-K6-2E+
Processor Model-Specific Registers
Model-Specific Register
Machine Check Address Register (MCAR)
Machine Check Type Register (MCTR)
Test Register 12 (TR12)
Time Stamp Counter (TSC)
Extended Feature Enable Register (EFER)
SYSCALL/SYSRET Target Address Register (STAR)
Write Handling Control Register (WHCR)
UC/WC Cacheability Control Register (UWCCR)
Processor State Observability Register (PSOR)
Page Flush/Invalidate Register (PFIR)
Level-2 Cache Array Register (L2AAR)
Enhanced Power Management Register (EPMR)
1
Value of ECX
00h
01h
0Eh
10h
C000_0080h
C000_0081h
C000_0082h
C000_0085h
C000_0087h
C000_0088h
C000_0089h
Notes:
1.
The EPMR register is supported in the low-power versions only of the AMD-K6-2E+ processor.
C000_0086h