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參數(shù)資料
| 型號(hào)： | 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(shuō)明 |
| 文件頁(yè)數(shù)： | 22/22頁(yè) |
| 文件大?。?/td> | 241K |
| 代理商： | 21326 |
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Programming Details
Implementation of Write Allocate in the K86 Processors
21326F/0—February 1999
;enable WA bit
MOV
RDMSR
OR
WRMSR
ECX,83H
;read HWCR (83h)
EAX,10H
;set bit 4
Case 2
For systems with a 1-Mbyte memory hole starting at the 15
Mbyte boundary and 32 Mbytes of total memory:
I
Program the WAPMRR MSR (ECX=86h) with 15 Mbytes
(00F0h) to 16 M
bytes –1 (00FFh)
Use the WRMSR instruction and the 64-bit hex value
0000_0000_00FF_00F0h
Program the WATMCR MSR (ECX=85h) with top of memory
(0200h) and all enable bits (0007h) to protect above the top
of memory, the fixed range, and the programmable range
Use the WRMSR instruction and the 64-bit hex value
0000_0000_0007_0200h
Note:
For 8-Mbyte systems, program 0080h in the lowest 16 bits.
For 16-Mbyte systems, program 0100h in the lowest 16 bits.
I
Code Sample
;disable WA bit (bit 4 of HWCR)
MOV
ECX,83H
RDMSR
AND
EAX,NOT 10H
WRMSR
;program programmable range to 15-16Mbytes
MOV
ECX,86H
MOV
EAX,0FF00F0H
XOR
EDX,EDX
WRMSR
;program top of memory and control bits
MOV
ECX,85H
MOV
EAX,70200H
XOR
EDX,EDX
WRMSR
;enable WA bit
MOV
ECX,83H
RDMSR
OR
EAX,10H
WRMSR
;read HWCR (83h)
;select WAPMRR
;address from F00000 to FFFFFF
;clear
;select WATMCR
;TME=1,PRE=1,FRE=1,TOM=0200h
;clear
;read HWCR (83h)
;set bit 4
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