Protypical implementation of DPT copying

kernel/drive.asm

@@ -8,24 +8,37 @@ dskseek:	resd 1
 		; disk buffer for I/O operations
 dskbuf:		resb 512
 
+dpt:		resb DPTSIZE
+
 section .text
 
 ret:		ret
 
+		; Convert drive number into DL for int 13h
+		; IN	dl	dos drive number
+		; OUT	dl	bios drive number
+getdl:		cmp dl, 2
+		jc ret
+		mov dl, 0x80
+		ret
+
 		; select drive
 		; IN	dl	drive number
-dsksel:		cmp dl, 1
-		jnc ret
-		mov al, dl
-		and al, 0x02
-		ror dl, 1
-		ror dl, 1
-		cmp dl, byte [dsknum]
+dsksel:		cmp dl, byte [dsknum]
 		je ret
 
 		call dskrst
 
-		int 3
+		call getdl
+		mov ah, 8
+		les di, [0x1E*4]
+		int 0x13
+
+		; copy dpt
+		mov bx, di
+		mov dx, dpt
+		mov cx, DPTSIZE
+		call lod
 
 		ret