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參數(shù)資料
| 型號： | 21326 |
| 英文描述： | Implementation of Write Allocate Application Note |
| 中文描述： | 在寫分配應(yīng)用執(zhí)行情況的說明 |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 241K |
| 代理商： | 21326 |
Programming Details
9
21326F/0—February 1999
Implementation of Write Allocate in the K86 Processors
Case 2
For AMD-K6 processor Models 6 and 7 and AMD-K6-2 processor
Model 8/[7:0] systems that do not have a memory hole starting
at the 15-Mbyte boundary, and have 16 Mbytes of total memory:
I
Program the WHCR MSR (ECX=C000_0082h) with
WCDE=0, WAELIM=4, and WAE15M=1
Use the WRMSR instruction and the 64-bit hex value
0000_0000_0000_0009h
Code Sample
;flush cache
PUSHF
CLI
WBINVD
;set Write Allocate Limit and set WAE15M bit
MOV
ECX,0C0000082H
MOV
EAX,09H
XOR
EDX,EDX
WRMSR
POPF
;save state
;disable interrupts
;write back and invalidate cache
;WCDE=0,WAELIM=4,WAE15M=1
;restore original state
Case 3
For AMD-K6-2 processor Model 8/[F:8] and AMD-K6-III
processor Model 9 systems that do not have a memory hole
starting at the 15-Mbyte boundary, and have 64 Mbytes of total
memory:
I
Program the WHCR MSR (ECX=C000_0082h) with
WAELIM=16d and WAE15M=1
Use the WRMSR instruction and the 64-bit hex value
0000_0000_0401_0000h
Code Sample
;flush cache
PUSHF
CLI
WBINVD
;set Write Allocate Limit and set WAE15M bit
MOV
ECX,0C0000082H
MOV
EAX,04010000H
XOR
EDX,EDX
WRMSR
POPF
;save state
;disable interrupts
;write back and invalidate cache
;WAELIM=16d,WAE15M=1
;restore original state
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