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Memory Type Range Register (MTRR) Mechanism 173
22007E/0—November 1999 AMD Athlon™ Processor x86 Code Optimization
Figure 12. MTRR Mapping of Physical Memory
0
FFFFFFFFh
512 Kbytes
256 Kbytes
256 Kbytes
8 Fixed Ranges
(64 Kbytes each)
64 Fixed Ranges
(4 Kbytes each)
16 Fixed Ranges
(16 Kbytes each)
80000h
C0000h
100000h
0-8 Variable Ranges
(2
12
to 2
32
)
SMM TSeg