.386p
	page	60,132
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cseg	segment	use16
	assume	cs:cseg,ds:cseg
	org	7c00h
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start:	cli				;§ ¯à¥â ¯à¥à뢠­¨©.
	in	al,70h			;§ ¯à¥â¨âì
	or	al,80h			;­¥¬ áª¨à㥬ë¥
	out	70h,al			;¯à¥à뢠­¨ï (NMI).
;............................
	in	al,92h			;®âªà®¥¬
	or	al,2			; ¤à¥á­ãî
	out	92h,al			;«¨­¨î A20.
;............................
	lgdt	6 ptr cs:[gdt0]		;ª®¬ ­¤  "LGDT".
	mov	eax,cr0			;¯¥à¥©â¨
	or	al,01			;¢ § é¨éñ­­ë©
	mov	cr0,eax			;०¨¬.
;............................
	push	08h			;ãáâ ­®¢¨¬
	pop	ds			;ᥫ¥ªâ®à DS.
	push	ds			;ãáâ ­®¢¨¬
	pop	es			;ᥫ¥ªâ®à ES.
;	push	ds			;ãáâ ­®¢¨¬
;	pop	fs			;ᥫ¥ªâ®à FS.
;	push	ds			;ãáâ ­®¢¨¬
;	pop	gs			;ᥫ¥ªâ®à GS.
;............................
	and	al,not 01		;¯¥à¥ª«îç¨âáï
	mov	cr0,eax                 ;¢ ॠ«ì­ë© ०¨¬.
;............................
	in	al,70h			;à §à¥è¨âì        
	and	al,7fh                  ;­¥¬ áª¨àã¥¬ë¥    
	out	70h,al                  ;¯à¥à뢠­¨ï (NMI).
	sti				;à §à¥è¨¬ ¯à¥à뢠­¨ï.
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	push	cs			;ãáâ ­®¢¨âì
	pop	ss			;ॣ¨áâà SS,
	mov	sp,offset start		;ॣ¨áâà SP
	push	cs			;ãáâ ­®¢¨¬
	pop	ds			;ᥣ¬¥­â DS.
;	push	cs			;ãáâ ­®¢¨¬
;	pop	es			;ᥣ¬¥­â ES.
;............................
	mov	bx,sp			;BX = "start"
	push	13cdh			;INT 13H.
	push	ds			;64-¡¨â­®¥
	push	ds			;ᬥ饭¨¥
	push	ds			;­ ç « 
	push	ds			;à §¤¥« .
	push	ds			;DS:BX ¡ãä¥à
	push	bx			;ç⥭¨ï/§ ¯¨á¨.
	push	01h			;1- ᥪâ®à.
	push	10h
;............................
	mov	si,sp			;¡«®ª ¯ à ¬¥â஢.
	push	4 ptr ds:[start+1beh+8]	;§ £à㧨âì
	pop	4 ptr ds:[si+8]		;ᬥ饭¨¥.
	mov	ax,4200h		;¯à®ç¨â âì ¨
	jmp	start-02		;¨á¯®«­¨âì BPR.
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gdt0	dw	15,offset gdt0-2,0	;à §¬¥à ¨  ¤à¥á GDT.
	db	0ffh,0ffh,000h,00h	;16-¡¨â­ë©
	db	000h,092h,0cfh,00h     	;4 ƒ¡ ᥣ¬¥­â.
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cseg	ends
	end	start