www.pudn.com > schdgurd.zip > HDPART.ASM

PartLoad equ 600h 
BootLoc equ 7c00h 
.MODEL tiny 
.CODE 
org 0 
Head: 
start: 
     cli 
     xor ax,ax 
     mov ss,ax 
     mov sp,7c00h 
     mov si,sp 
     push ax 
     pop es 
     push ax 
     pop ds 
     sti 
     cld 
     mov di,PartLoad 
     mov cx,100h 
     repne movsw 
 
     db 0EAh 
     dw offset Continue+600H,0000h 
Continue: 
     mov si,PartLoad+1BEH 
     mov bl,4 
FindBoot: 
     cmp byte ptr [si],80h 
     je SaveRec 
     cmp byte ptr [si],0 
     jne Invalid 
     add si,10h 
     dec bl 
     jnz FindBoot 
     int 18h 
SaveRec: 
     mov dx,[si] 
     mov cx,[si+2] 
     mov bp,si 
FindNext: 
     add si,10h 
     dec bl 
     jz SetRead 
     cmp byte ptr [si],0 
     je FindNext 
Invalid: 
     mov si,offset ErrMsg1+600h 
PrintStr: 
     lodsb 
     cmp al,0 
     je DeadLock 
     push si 
     mov bx,7 
     mov ah,0Eh 
     int 10h 
     pop si 
     jmp short PrintStr 
DeadLock: 
     jmp short DeadLock 
SetRead: 
     mov di,5 
ReadBoot: 
     mov bx,BootLoc 
     mov ax,201h 
     push di 
     int 13h 
     pop di 
     jne GoBoot 
     xor ax,ax 
     int 13h 
     dec di 
     jnz ReadBoot 
     mov si,offset ErrMsg2+600h 
     jmp short PrintStr 
GoBoot: 
     mov si,offset ErrMsg3+600h 
     mov di,7c00H+1FEH 
     cmp word ptr [di],0AA55h 
     jne PrintStr 
     mov si,bp 
     db 0EAh,00h,7ch,00h,00h 
ErrMsg1 db 'Invalid partition table',0 
ErrMsg2 db 'Error loading operating system',0 
ErrMsg3 db 'Missing operating system',0 
Tail: 
FillNum equ 1BEH-(Tail-Head) 
	db FillNum dup (0) 
PartTable db 80h,01h,01h,00h,04h,04h 
	  db 0D1h,02h,11h,00h,00h,00h 
	  db 0EEh,0FFh,00h,00h,00h,00h 
	  db 0C1h,03h,05h,04h,0D1h,0FEh 
	  db 0FFh,0FFh,00h,00h,0ACh,53h 
	  db 00h,00h,00h,00h,00h,00h 
          db 00h,00h,00h,00h,00h,00h 
	  db 00h,00h,00h,00h,00h,00h 
	  db 00h,00h,00h,00h,00h,00h 
	  db 00h,00h,00h,00h,00h,00h 
	  db 00h,00h,00h,00h 
MagicID dw 0AA55h 
	end start