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]] <para>The boundary between the kernel- and user-level code is enforced by
]] hardware-protection facilities provided by the underlying hardware.

>> On Sun, 06 May 2001 22:21:47 +0900 (JST), Koga Youichirou
>> <y-koga@jp.freebsd.org> said:
;> $B$"!"!V$h$C$F!D$h$C$F!W$O7y$J$N$G!"(B

;> +        $B%+!<%M%k%l%Y%k%3!<%I$H%f!<%6%l%Y%k%3!<%I$N4V$N6-3&$O(B, $B%O!<%I%&%'%"$G(B
;> +        $BDs6!$5$l$k%O!<%I%&%'%"J]8n5!G=$K$h$C$F6/2=$5$l$F$$$^$9(B.

;> $B$H$7$^$7$g$&!#(B

1) $B!V%O!<%I%&%'%"$GDs6!$5$l$k%O!<%I%&%'%"J]8n5!G=!D!W$C$F$J$s$@$+JQ!#(B
$B"*(B $B!V4pHW$H$J$k%O!<%I%&%'%"$GDs6!$5$l$k%O!<%I%&%'%"%l%Y%k$NJ]8n5!G=!D!W(B

2) enforced $B$r!V6/2=$5$l$F$$$^$9!W$OJQ(B?
$B"*(B $B!V6/@)$5$l$F$$$^$9!W(B($B$h$&$O!"(BCPU$B$N<B9T%b!<%I$H(BMMU$B$G6-3&$,6/@)$5$l$k$C(B
$B$F$3$H$G$7$g$&(B

]] The kernel operates in a separate address space that is inaccessible to
]] user processes.

>> On Sun, 06 May 2001 22:14:23 +0900 (JST), Koga Youichirou
>> <y-koga@jp.freebsd.org> said:
:> +        $B%+!<%M%k$O(B, $B%f!<%6%W%m%;%9$K$H$C$F%"%/%;%9$7$K$/$$@Z$jN%$5$l$?(B

$B!V%"%/%;%9$7$K$/$$!W"*!V%"%/%;%9$G$-$J$$!W(B
$B!V@Z$jN%$5$l$?!W"*!VJ,N%$5$l$?!W(B

:> +        $B%"%I%l%96u4V$G:nF0$7$^$9(B. $BFC8"$N$"$kA`:n(B -- $BNc$($P(B
:> +        I/O $B$N3+;O$dCf1{=hM}AuCV(B (CPU) $B$NDd;_(B --
:> +        $B$O(B, $B%+!<%M%k$@$1$,MxMQ2DG=$G$9(B.
 

:>  	Like parameters passed into the kernel,
:>  	addresses used for
:>  	the return of results must be validated to ensure that they are
:>  	part of an application's address space.
:> -        $B%+!<%M%k$XEO$5$l$?%Q%i%a!<%?!<$N$h$&$K(B, $B7k2L$rLa$9$?$a$K(B
:> +        $B%+!<%M%k$XEO$5$l$?%Q%i%a!<%?$N$h$&$K(B, $B7k2L$rLa$9$?$a$K(B
:>          $B;HMQ$5$l$?%"%I%l%9$O$=$l$i$,%"%W%j%1!<%7%g%s$N%"%I%l%96u4V$N(B
            ~~~~($B%"%W%j%1!<%7%g%s$K$h$C$F(B)$B;XDj(B
$B!t(B $B0UL#E*$JLu$G$9$,!D(B

:> -        $B0lIt$G$"$k$3$H$r3N<B$K$9$k$?$a$K3NG'$5$l$J$1$l$P$J$j$^$;$s(B.
:> +        $B0lIt$G$"$k$3$H$r3N<B$K$9$k$?$a$K8!>Z$5$l$J$1$l$P$J$j$^$;$s(B.
 

:> +        C $B%W%m%0%i%_%s%08@8l$K$D$$$F$O(B, $B$3$N%(%i!<%3!<%I$,Bg0hJQ?t(B
                                  ~~~~~~$B$*$$$F(B
$B!t(B $B$N$[$&$,$9$o$j$,NI$$(B?

:> +        <emphasis>errno</emphasis> $B$K3JG<$5$l$^$9(B. $B$^$?(B, $B%7%9%F%`%3!<%k$r(B
:> +        $B<B9T$7$?4X?t$O(B -1 $B$NCM$rJV$7$^$9(B.</para>
 
$BF|Ln(B
