* Make total stack size available as a symbol

* Implement SWI handler to enable/disable interrupts
* Implement event system to deal with kicking non-interrupt code

interrupt.h

@@ -1,6 +1,8 @@
 #ifndef __INTERRUPT_H
 #define __INTERRUPT_H
 
+#include "swi.h"
+
 #define VICVectAddr (*(volatile unsigned int *)0xFFFFF030)
 
 #define I_WDT		0
@@ -43,4 +45,7 @@ void interrupt_register_code(unsigned int source, unsigned int priority,
 #define interrupt_register(x, fn) \
 	interrupt_register_code(I_##x, I_PRIORITY_##x, fn)
 
+#define interrupt_block() swi_call(SWI_INTERRUPT_BLOCK)
+#define interrupt_unblock() swi_call(SWI_INTERRUPT_UNBLOCK)
+
 #endif /* __INTERRUPT_H */