Added code to support getting interrupts from the PIC. Can now get some data from the keyboard, however, it's not quite working yet.

kernel/irq.s

@@ -0,0 +1,67 @@
+global irq0		; PIC Timer Interrupt
+global irq1		; Keyboard
+global irq2		; Cascade (Used internally by the two PICs; never raised)
+global irq3		; COM2
+global irq4		; COM1
+global irq5		; LPT2
+global irq6		; Floppy Disk
+global irq7		; LPT1
+global irq8		; CMOS realt-time clock
+global irq9		; Free for perpherals / legacy SCSI / NIC
+global irq10	; Free for perpherals / NIC
+global irq11	; Free for perpherals / NIC
+global irq12	; PS2 mouse
+global irq13	; FPU / Coprocessor / Inter-process
+global irq14	; Primary ATA HDD
+global irq15	; Secondary ATA HDD
+
+extern handle_key_press
+
+irq0:
+	iret
+
+irq1:
+	call handle_key_press
+	iret
+	
+irq2:
+	iret
+	
+irq3:
+	iret
+	
+irq4:
+	iret
+	
+irq5:
+	iret
+	
+irq6:
+	iret
+	
+irq7:
+	iret
+	
+irq8:
+	iret
+	
+irq9:
+	iret
+	
+irq10:
+	iret
+	
+irq11:
+	iret
+	
+irq12:
+	iret
+	
+irq13:
+	iret
+	
+irq14:
+	iret
+	
+irq15:
+	iret