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To: FreeBSD-users-jp@jp.freebsd.org
In-reply-to: Your message of "Fri, 14 Nov 1997 20:59:17 JST."
             <199711141159.UAA10573@electra.is.s.u-tokyo.ac.jp> 
Date: Fri, 14 Nov 1997 23:25:06 +0900
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Subject: [FreeBSD-users-jp 20717] Re: 6x86 Bug (Re: Pentium Bug) 
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On Fri, 14 Nov 1997 20:59:17 +0900 (JST), taka@is.s.u-tokyo.ac.jp (NAKAMURA Takayuki) said:

:> Pentium F0 $B%P%0$,BgA{$.$K$J$C$F$^$9$,!"(B
:> Cyrix 6x86$B%7%j!<%:$K$bF1MM$N%P%0$,8+$D$+$C$?$h$&$G$9$M!#(B

:> $B%P%0$,$"$k$N$O(B 6x86, 6x86L, 6x86MX $B$@$=$&$G$9!#(B #$B$&$A$b(B6x86MX$B$J$s$@$h$J!<(B
:> $B$?$@$7(B F0 $B%P%0$H$O0c$C$F!"%=%U%HE*$K(B CPU $B$N%l%8%9%?$r@_Dj$9$k$3$H$G!"(B
:> $B40A4$K%P%0$r2sHr$G$-$k$=$&$G$9!#(B

$BAk(B95$B$N(B 6x86opt.exe$B$O$4B8CN$G$9$+!)(B $BE:IU%I%-%e%a%s%H$h$jH4?h!%(B
$B$4;29M$^$G!%(B

*WHICH BITS ARE SET*
--------------------
    The following bits are set:

    bit(s)  | reg:bit | why
    ------------------------------------------------------------------------
    NO_LOCK | CCR1:4  | "With NO_LOCK set, previously noncacheable locked
            |         |  cycles are executed as unlocked cycles and,
            |         |  therefore, may be cached. This results in higher 
            |         |  CPU performance."
            |         | The reason the bit is not set as default is because
            |         | software that require locked cycles might exist. I
            |         | have never had any problems with this. 
    ------------------------------------------------------------------------

--
   $B=)MU(B $B9,HO(B(Yukinori AKIBA)
   $B2q<R!'(Bakiba@sxsmd.ho.nec.co.jp (NEC Corporation)
   $B<+Bp!'(Bakiba@mtf.biglobe.ne.jp  (BIGLOBE)
