--- /dev/null
+#ifndef _ASM_IO_H
+#define _ASM_IO_H
+extern int printf(const char *fmt, ...);
+extern unsigned long get_ticks(void);
+
+#define _read(source) \
+({ unsigned long __res; \
+ __asm__ __volatile__( \
+ "mfc0\t%0, " #source "\n\t" \
+ : "=r" (__res)); \
+ __res; \
+})
+
+#define __read(source) \
+({ unsigned long __res; \
+ __asm__ __volatile__( \
+ "move\t%0, " #source "\n\t" \
+ : "=r" (__res)); \
+ __res; \
+})
+
+#endif