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Vol. 3 11-31
MEMORY CACHE CONTROL
Reserved* 03H
Write-through (WT) 04H
Write-protected (WP) 05H
Writeback (WB) 06H
Reserved* 7H through FFH
NOTE:
* Use of these encodings results in a general-protection exception (#GP).
Figure 11-4. Mapping Physical Memory With MTRRs
Table 11-8. Memory Types That Can Be Encoded in MTRRs (Contd.)
0
FFFFFFFFH
80000H
BFFFFH
C0000H
FFFFFH
100000H
7FFFFH
512 KBytes
256 KBytes
256 KBytes
8 fixed ranges
16 fixed ranges
64 fixed ranges
Variable ranges
(64-KBytes each)
(16 KBytes each)
(4 KBytes each)
(from 4 KBytes to
maximum size of
Address ranges not
Physical Memory
mapped by an MTRR
are set to a default type
physical memory)