From owner-FreeBSD-users-jp@jp.freebsd.org  Fri Feb 13 13:52:52 1998
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Date: Fri, 13 Feb 98 13:51:32 JST
From: Shunsuke Akiyama <akiyama@kme.mei.co.jp>
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To: FreeBSD-users-jp@jp.freebsd.org
In-Reply-To: <199802130103.KAA29831@s64.saskg.semicon.sony.co.jp> (message from Takashi Saeki on Fri, 13 Feb 1998 10:03:16 +0900)
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Subject: [FreeBSD-users-jp 24561] Re: [Q]Bounce Buffer
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$B$"$-$d$^$G$9!#(B

Takashi Saeki <saeki@saskg.semicon.sony.co.jp> writes:

> # $B5-21$K<+?.$,L5$/$J$C$F$-$?$N$G!"$3$NJU$K>\$7$$?M$N%U%)%m!<4?7^!#(B

$B$"$s$^$j!">\$7$/$O$J$$$G$9$,!"3P$($F$$$kHO0O$G=q$-$^$9!#(B

> $B$I$&$$$&7P0^$G(B BOUNCE_BUFFER $B%*%W%7%g%s$,CB@8$7$?$N$+$OCN$i$J$$$N$G$9$,!"(B
> $B$*$=$i$/(B ISA $B%P%9%^%9%?$J%V%m%C%/%G%P%$%9!J(BSCSI $B%3%s%H%m!<%i0J30(B
> $BB8:_$7$J$$$H;W$$$^$9$,!K$N%5%]!<%H@lMQ$_$?$$$J46$8$GMQ0U$5$l$?$N$G$7$g$&!#(B

$B$`$+!<$7$N(B IBM-PC $B$"$k$$$O!"$=$N8_495!$O!"EvA3$J$,$i(B ISA $B%P%9$7$+$"$j(B
$B$^$;$s$G$7$?!#$G!"$3$l$i$N%^%7%s$O!"%a%b%j$b(B 16MB $B$^$G$7$+;H$($^$;$s$G(B
$B$7$?!#$=$N$&$A(B ISA $B%P%9$7$+$b$C$F$J$$$/$;$K!"%a%b%j$@$1$O!"(B16MB $B$rD6$((B
$B$k%5%$%:$rEk:\$G$-$k%^%7%s$,$"$i$o$l$?$N$G$9!#$H$3$m$,!"%^%6!<%\!<%I>e(B
$B$N(B DMA $B4XO"$N%O!<%I%&%'%"$O!"AjJQ$o$i$:(B ISA $B%P%9$N8B3&$G$"$k!"(B24 $B%S%C(B
$B%H!&%"%I%l%9$r%5%]!<%H$9$k$KN1$^$C$F$$$^$7$?!#$3$NCJ3,$G!"(BDMA $B5!G=$,Ek(B
$B:\$9$kA4$F$N%a%b%jHO0O$G;H$($J$/$J$k;vBV$H$J$C$?$o$1$G$9!#$=$3$G!"%P%&(B
$B%s%9!&%P%C%U%!$N%7%9%F%`$,EP>l$9$k$3$H$K$J$k$s$G$9$M!#(B

$B$3$N8e!"(BEISA $B%P%9!&%7%9%F%`$,8=$l$^$7$?$,!"(BEISA $B%P%9Ek:\$N%^%6!<%\!<%I(B
$B$O!"@_7WCJ3,$+$i(B 32 $B%S%C%H!&%"%I%l%9BP1~$N(B DMA $B%O!<%I%&%'%"$,Ek:\$5$l(B
$B$F$$$^$7$?$N$G!">e5-$NLdBj$OH/@8$7$^$;$s$G$7$?!#(B

$B$5$i$K!"(BVESA VL $B%P%9$H$$$&$3$H$K$J$k$o$1$G$9$,!"%^%6!<%\!<%I>e$N(B DMA 
$B4XO"%O!<%I$O!"(BISA $B%P%9AjEv$H$$$&$3$H$G!"(BISA $B%P%9!&%7%9%F%`$HF1MM$N@)8B(B
$B$,H/@8$9$k$3$H$K$J$j$^$9!#(B

PCI $B%P%9!&%7%9%F%`0J9_$K4X$7$F$O!"(BDMA $B5!G=$K4X$7$FFC$KLdBj$O$J$$$G$7$g(B
$B$&!#(B

$B$$$:$l$K$7$F$b!"%P%&%s%9!&%P%C%U%!5!9=$,I,MW$K$J$k$N$O!"(BDMA $B%O!<%I%&%'(B
$B%"$K$h$C$F%"%/%;%92DG=$J%a%b%jNN0h$h$jB?$/$N%a%b%j$rEk:\$7$?%7%9%F%`!"(B
$B$H$$$&$3$H$K$J$j$^$9!#(B

ISA $B%P%9%^%9%?!&%G%P%$%9$O!"$=$NL>$NDL$j!"(BISA $B%P%9$G5,Dj$5$l$?%5%$%:$N(B
$B%a%b%j$K$7$+(B DMA $B%"%/%;%9$G$-$^$;$s$+$i!">e5-$N@)8B$K$R$C$+$+$C$F$-$^(B
$B$9!#$7$?$,$C$F!"(B16MB $B$rD6$($k%5%$%:$N%a%b%j$rEk:\$7$?%7%9%F%`$G!"(BISA 
$B%P%9%^%9%?!&%G%P%$%9$r;H$C$F(B DMA $BE>Aw$r9T$&>l9g$O!"%P%&%s%9!&%P%C%U%!(B
$B5!9=$,I,?\$H$$$&$3$H$K$J$j$^$9!#(B

$BMW$9$k$K!"(BBOUNCE_BUFFER $B%*%W%7%g%s$O!"$J$K$b(B ISA SCSI $B%3%s%H%m!<%i$N$?(B
$B$a$@$1$K$"$k$o$1$G$O$"$j$^$;$s!#(B
$B$H$$$&$3$H$,8@$$$?$+$C$?$@$1$J$s$G$9!#(B

$B!t(B $B$@$$$V!"$O$7$g$C$F=q$$$F$k$N$H!"5-21$K$?$h$C$F$$$k$N$G!"4V0c$$$,$"(B
$B!t(B $B$k$+$b!#$D$C$3$_Bg4?7^!#(B
-- 
	$B=);3=SJe(B
	akiyama@kme.mei.co.jp
