x86$B%"!<%-%F%/%A%c(B

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$B%;%0%a%s%H%l%8%9%?$K$O%;%l%/%?CM$,4^$^$l$F$$$^$9!#(B $B$3$NCM$O%;%0%a%s%H%G%#%9%/%j%W%?%F!<%V%k$NCf$K$"$k(B $B%;%0%a%s%H%G%#%9%/%j%W%?$r<($7$^$9!#%;%0%a%s%H%G%#%9%/%j%W%?$K$O(B $B%;%0%a%s%H%Y!<%9$,5-=R$5$l$F$$$^$9$N$G!"$=$l$r%;%0%a%s%H(B $B%"%I%l%9$H$7$^$9!#%G%#%9%/%j%W%?%F!<%V%k$K$OL\E*$K$h$j(B $B%0%m!<%P%k%G%#%9%/%j%W%?%F!<%V%k!"%m!<%+%k%G%#%9%/%j%W%?%F!<%V%k$,(B $B$"$j$j$^$9!#%0%m!<%P%k%G%#%9%/%j%W%?%F!<%V%k$O(B $B%7%9%F%`$K#1$D$G$9$,!"%m!<%+%k%G%#%9%/%j%W%?%F!<%V%k$O%?%9%/Kh$K(B $B;}$A$^$9!#$=$7$F!"$3$l$i$N%F!<%V%k$N0LCV$r;X$7<($7$F$$$k$N$O(B GDTR$B$H(B LDTR$B$G$9!#$3$l$i$N%F!<%V%k$r$I$N$h$&$K;H$&$+$O(BOS$B$K$h$C$F(B $B0c$C$FMh$^$9!#(B

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Linux$B$K$*$1$k3d$j9~$_HV9f$N4IM}(B

Linux$B$K$*$1$k3d$j9~$_HV9f$N4IM}$O asm-i386/irq.h #define NR_IRQS 224 linux/include/asm/hw_irq.h: IDT vectors usable for external interrupt sources start at 0x20: #define FIRST_EXTERNAL_VECTOR 0x20 #define SYSCALL_VECTOR 0x80 Vectors 0x20-0x2f are used for ISA interrupts. Vectors 0xf0-0xfa are free (reserved for future Linux use). #define SPURIOUS_APIC_VECTOR 0xff #define ERROR_APIC_VECTOR 0xfe #define INVALIDATE_TLB_VECTOR 0xfd #define RESCHEDULE_VECTOR 0xfc #define CALL_FUNCTION_VECTOR 0xfb #define LOCAL_TIMER_VECTOR 0xef extern int irq_vector[NR_IRQS]; 
80386$B0J9_$N(BCPU
$BO@M}%"%I%l%96u4V(B 64TB
$BJ*M}%"%I%l%96u4V(B 4GB
$B%;%0%a%s%H%5%$%:(B 4GB

486CPU$B$N%P%9(B
$B%"%I%l%9%P%9(B	32 bit
$B%G!<%?%P%9(B	32 bit
I/O $B%P%9(B	16 bit

$BHFMQ%l%8%9%?72(B
				32 bit	16bit	8bit
$B%"%-%e%`%l!<%?(B			EAX	AX	AH,AL
$B%Y!<%9%l%8%9%?(B			EBX	BX	BH,BL
$B%+%&%s%?%l%8%9%?(B		ECX	CX	CH,CL
				EDX	DX	DH,DL
$B%=!<%9%$%s%G%C%/%9(B		ESI	SI
$B%G%9%F%#%M!<%7%g%s%$%s%G%C%/%9(B	EDI	DI
$B%Y!<%9%]%$%s%?(B			EBP	BP		
$B%9%?%C%/%]%$%s%?(B		ESP	SP		
$B%$%s%9%H%i%/%7%g%s%]%$%s%?(B	EPI	PI		
$B%U%i%0%l%8%9%?(B			EFLAGS	FLAGS
$B%;%0%a%s%H%l%8%9%?(B
	$B%3!<%I%;%0%a%s%H(B		CS
	$B%G!<%?%;%0%a%s%H(B		DS
	$B%9%?%C%/%;%0%a%s%H(B		SS
	$B%(%/%9%H%i%;%0%a%s%H(B		ES
					FS
					GS
$B!v%$%s%9%H%i%/%7%g%s%]%$%s%?$O$$$o$f$k%W%m%0%i%`%+%&%s%?$N$3$H(B

$B%7%9%F%`%l%8%9%?72(B
				 48 bit	32 bit	16 bit
$B%7%9%F%`%"%I%l%9%l%8%9%?(B
$B%0%m!<%P%k%G%#%9%/%j%W%?%F!<%V%k(B GDTR
$B3d$j9~$_%G%#%9%/%j%W%?%F!<%V%k(B	 IDTR
						LDTR
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$B%3%s%H%m!<%k%l%8%9%?(B
					CR0
					CR1
					CR2
					CR3

GNU$B%"%;%s%V%j8@8l(B

$BI=8=5,B'$NNcBj(B
movw %ax,%bx		%ax$B$NFbMF$r(B%bx$B$KBeF~(B
movw $123,%ax		$B==?J?t(B123$B$r(B%ax$B$KBeF~(B
movb $-0xa1,%cx		$B#1#6?J?t(B-a1$B$r(B%cx$B$KBeF~(B
movb $0b10111101,%dh	$B#2?J?t(B10111101$B$r(B%dh$B$KBeF~(B
movb $'A',%dl		$BJ8;z(B'A'$B$r(B%dl$B$KBeF~(B
movl $var,%esi		$BJQ?t(Bvar$B$N%"%I%l%9CM$r(B%esi$B$KBeF~(B
movb var,%ah		$BJQ?t(Bvar$B$N%a%b%j$NFbMF$r(B%ah$B$KBeF~(B
movb (%ebx),var		%ebx$B$,<($9%"%I%l%9$N%a%b%j$NFbMF$rJQ?t(Bvar$B$KBeF~(B

x86$B$N%a%b%j%"%I%l%C%7%s%0%b!<%I(B
$B%$%_!<%G%#%(!<%H%"%I%l%C%7%s%0(B
	mov  $0x12, %al		16$B?J?t(B12$B$r(B%al$B$KBeF~(B
	addl $0x89af,%ebx	16$B?J?t(B89af$B$r(B%ebx$B$NFbMF$K2C;;(B
				
$BD>@\%"%I%l%C%7%s%0(B
	movb ($0x12),%al	16$B?J?t(B12$B$N%"%I%l%9$NFbMF$r$r(B%al$B$KBeF~(B
	movb 0x12,%al	 	$B>e5-$HF1$8(B
	movl var, %ebx		$BJQ?t(Bvar$B$NFbMF$r(B%ebx$B$KBeF~(B

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	movb (%bx),%al		%bx$B$,<($9%"%I%l%9$NFbMF$r(B%al$B$KBeF~(B
	movb %cl,(%ebx)		%cl$B$NFbMF$r(B%ebx$B$,<($9%"%I%l%9$KBeF~(B

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				  $B$=$NFbMF$r(B%al$B$KBeF~(B
        incw -10(%ebp)		%ebp$B$NFbMF$K==?J?t(B-10$B$r2C$($?CM$r(B
				  $B%"%I%l%9$H$7$F$=$NFbMF$r%$%s%/%j%a%s%H$9$k(B