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)： 16/22頁(yè)
文件大?。?/td> 241K
代理商： 21326
8
Programming Details
Implementation of Write Allocate in the K86 Processors
21326F/0—February 1999
Step 3: AMD-K6
Processor (All Models)
The BIOS programmer has several options regarding what the
end-user can control. The BIOS can provide the end-user with a
setup screen option to enable/disable write allocate or options to
define the Write Allocate Enable Limit field and set the Write
Allocate Enable 15-to-16-Mbyte bit. The BIOS can also
automatically enable and setup the write allocate feature and its
registers without end-user intervention. This automatic setup is
recommended. To disable all write allocate features for the
AMD-K6 processor, the WHCR must be set to
0000_0000_0000_0000h—the default value after power-on reset.
AMD-K6
Processor Programming Example for Write Allocate Registers
The following cases show examples of programming the write
allocate feature for three types of systems:
Case 1
For AMD-K6 processor Models 6 and 7 and AMD-K6-2 processor
Model 8/[7:0] systems that have a 1-Mbyte memory hole starting
at the 15-Mbyte boundary, and 32 Mbytes of total memory:
I
Program the WHCR MSR (ECX=C000_0082h) with
WCDE=0, WAELIM=8, and WAE15M=0
Use the WRMSR instruction and the 64-bit hex value
0000_0000_0000_0010h
Code Sample
;flush cache
PUSHF
CLI
WBINVD
;set Write Allocate Limit and clear WAE15M bit
MOV
ECX,0C0000082H
MOV
EAX,10H
XOR
EDX,EDX
WRMSR
POPF
;save state
;disable interrupts
;write back and invalidate cache
;WCDE=0,WAELIM=8,WAE15M=0
;restore original state
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