Routine for loading far ptr from IVT

kernel/intr.asm

@@ -32,3 +32,29 @@ intr_register:
   pop es
   pop ax
   ret
+
+; Get address for a interrupt vector
+; in	AL	interrupt number
+; out	DS:SI	far ptr to routine/data
+intr_load:
+  push ax
+
+  ; SI = AL * 4
+  mov ah, 4
+  mul ah
+  mov si, ax
+
+  ; ES = 0
+  xor ax, ax
+  mov ds, ax
+
+  ; load offset
+  lodsw
+  mov si, ax
+
+  ; load segment
+  lodsw
+  mov ds, ax
+
+  pop ax
+  ret