diff --git a/sys/amd64/include/clock.h b/sys/amd64/include/clock.h
--- a/sys/amd64/include/clock.h
+++ b/sys/amd64/include/clock.h
@@ -1,46 +1,5 @@
-/*-
- * Kernel interface to machine-dependent clock driver.
- * Garrett Wollman, September 1994.
- * This file is in the public domain.
- *
- * $FreeBSD$
- */
-
-#ifndef _MACHINE_CLOCK_H_
-#define	_MACHINE_CLOCK_H_
-
-#ifdef _KERNEL
-/*
- * i386 to clock driver interface.
- * XXX large parts of the driver and its interface are misplaced.
- */
-extern int	clkintr_pending;
-extern u_int	i8254_freq;
-extern int	i8254_max_count;
-extern uint64_t	tsc_freq;
-extern int	tsc_is_invariant;
-extern int	tsc_perf_stat;
-#ifdef SMP
-extern int	smp_tsc;
-#endif
-
-void	i8254_init(void);
-void	i8254_delay(int);
-void	clock_init(void);
-
 /*
- * Driver to clock driver interface.
+ * This file is in the public domain.
  */
 
-void	startrtclock(void);
-void	init_TSC(void);
-void	resume_TSC(void);
-
-#define	HAS_TIMER_SPKR 1
-int	timer_spkr_acquire(void);
-int	timer_spkr_release(void);
-void	timer_spkr_setfreq(int freq);
-
-#endif /* _KERNEL */
-
-#endif /* !_MACHINE_CLOCK_H_ */
+#include <x86/clock.h>
diff --git a/sys/i386/include/clock.h b/sys/i386/include/clock.h
--- a/sys/i386/include/clock.h
+++ b/sys/i386/include/clock.h
@@ -1,43 +1,5 @@
-/*-
- * Kernel interface to machine-dependent clock driver.
- * Garrett Wollman, September 1994.
- * This file is in the public domain.
- *
- * $FreeBSD$
- */
-
-#ifndef _MACHINE_CLOCK_H_
-#define	_MACHINE_CLOCK_H_
-
-#ifdef _KERNEL
-/*
- * i386 to clock driver interface.
- * XXX large parts of the driver and its interface are misplaced.
- */
-extern int	clkintr_pending;
-extern u_int	i8254_freq;
-extern int	i8254_max_count;
-extern uint64_t	tsc_freq;
-extern int	tsc_is_invariant;
-extern int	tsc_perf_stat;
-
-void	i8254_init(void);
-void	i8254_delay(int);
-void	clock_init(void);
-
 /*
- * Driver to clock driver interface.
+ * This file is in the public domain.
  */
 
-void	startrtclock(void);
-void	init_TSC(void);
-void	resume_TSC(void);
-
-#define	HAS_TIMER_SPKR 1
-int	timer_spkr_acquire(void);
-int	timer_spkr_release(void);
-void	timer_spkr_setfreq(int freq);
-
-#endif /* _KERNEL */
-
-#endif /* !_MACHINE_CLOCK_H_ */
+#include <x86/clock.h>
diff --git a/sys/amd64/include/clock.h b/sys/x86/include/clock.h
copy from sys/amd64/include/clock.h
copy to sys/x86/include/clock.h