diff --git a/sys/amd64/amd64/support.S b/sys/amd64/amd64/support.S
index 10dfe2ffcad3..df32d006c570 100644
--- a/sys/amd64/amd64/support.S
+++ b/sys/amd64/amd64/support.S
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: support.s,v 1.30 1995/12/27 18:54:51 davidg Exp $
+ *	$Id: support.s,v 1.31 1995/12/28 23:14:40 davidg Exp $
  */
 
 #include "assym.s"				/* system definitions */
@@ -48,18 +48,6 @@ _bzero:	.long	_generic_bzero
 
 	.text
 
-/*
- * Support for reading real time clock registers
- */
-ENTRY(rtcin)					/* rtcin(val) */
-	movl	4(%esp),%eax
-	outb	%al,$0x70
-	FASTER_NOP
-	xorl	%eax,%eax
-	inb	$0x71,%al
-	FASTER_NOP
-	ret
-
 /*
  * bcopy family
  * void bzero(void *base, u_int cnt)
diff --git a/sys/amd64/amd64/support.s b/sys/amd64/amd64/support.s
index 10dfe2ffcad3..df32d006c570 100644
--- a/sys/amd64/amd64/support.s
+++ b/sys/amd64/amd64/support.s
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: support.s,v 1.30 1995/12/27 18:54:51 davidg Exp $
+ *	$Id: support.s,v 1.31 1995/12/28 23:14:40 davidg Exp $
  */
 
 #include "assym.s"				/* system definitions */
@@ -48,18 +48,6 @@ _bzero:	.long	_generic_bzero
 
 	.text
 
-/*
- * Support for reading real time clock registers
- */
-ENTRY(rtcin)					/* rtcin(val) */
-	movl	4(%esp),%eax
-	outb	%al,$0x70
-	FASTER_NOP
-	xorl	%eax,%eax
-	inb	$0x71,%al
-	FASTER_NOP
-	ret
-
 /*
  * bcopy family
  * void bzero(void *base, u_int cnt)
diff --git a/sys/amd64/amd64/tsc.c b/sys/amd64/amd64/tsc.c
index d9ae3732d30a..b4a01cee1cb9 100644
--- a/sys/amd64/amd64/tsc.c
+++ b/sys/amd64/amd64/tsc.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)clock.c	7.2 (Berkeley) 5/12/91
- *	$Id: clock.c,v 1.51 1996/01/30 18:56:47 wollman Exp $
+ *	$Id: clock.c,v 1.53 1996/03/23 21:36:03 nate Exp $
  */
 
 /*
@@ -400,6 +400,19 @@ sysbeep(int pitch, int period)
  * RTC support routines
  */
 
+int
+rtcin(reg)
+	int reg;
+{
+	u_char val;
+
+	outb(IO_RTC, reg);
+	inb(0x84);
+	val = inb(IO_RTC + 1);
+	inb(0x84);
+	return (val);
+}
+
 static __inline void
 writertc(u_char reg, u_char val)
 {
diff --git a/sys/amd64/include/clock.h b/sys/amd64/include/clock.h
index 867131154b95..f7ba36e95b0f 100644
--- a/sys/amd64/include/clock.h
+++ b/sys/amd64/include/clock.h
@@ -3,7 +3,7 @@
  * Garrett Wollman, September 1994.
  * This file is in the public domain.
  *
- *	$Id: clock.h,v 1.8 1995/12/24 08:10:49 davidg Exp $
+ *	$Id: clock.h,v 1.9 1996/01/30 18:56:24 wollman Exp $
  */
 
 #ifndef _MACHINE_CLOCK_H_
@@ -95,6 +95,7 @@ int	acquire_timer0 __P((int rate,
 int	acquire_timer2 __P((int mode));
 int	release_timer0 __P((void));
 int	release_timer2 __P((void));
+int	rtcin __P((int val));
 int	sysbeep __P((int pitch, int period));
 
 #endif /* KERNEL && !LOCORE */
diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
index 756bb6584518..9e4896d80815 100644
--- a/sys/amd64/include/cpufunc.h
+++ b/sys/amd64/include/cpufunc.h
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: cpufunc.h,v 1.46 1996/03/26 19:57:56 wollman Exp $
+ *	$Id: cpufunc.h,v 1.47 1996/03/28 20:39:45 wollman Exp $
  */
 
 /*
@@ -368,7 +368,6 @@ void	load_cr3	__P((u_long cr3));
 void	ltr		__P((u_short sel));
 u_int	rcr0		__P((void));
 u_long	rcr3		__P((void));
-int	rtcin		__P((int val));
 
 /*
  * These functions are NOT in support.s and should be declared elsewhere.
diff --git a/sys/amd64/isa/clock.c b/sys/amd64/isa/clock.c
index d9ae3732d30a..b4a01cee1cb9 100644
--- a/sys/amd64/isa/clock.c
+++ b/sys/amd64/isa/clock.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)clock.c	7.2 (Berkeley) 5/12/91
- *	$Id: clock.c,v 1.51 1996/01/30 18:56:47 wollman Exp $
+ *	$Id: clock.c,v 1.53 1996/03/23 21:36:03 nate Exp $
  */
 
 /*
@@ -400,6 +400,19 @@ sysbeep(int pitch, int period)
  * RTC support routines
  */
 
+int
+rtcin(reg)
+	int reg;
+{
+	u_char val;
+
+	outb(IO_RTC, reg);
+	inb(0x84);
+	val = inb(IO_RTC + 1);
+	inb(0x84);
+	return (val);
+}
+
 static __inline void
 writertc(u_char reg, u_char val)
 {
diff --git a/sys/i386/i386/support.s b/sys/i386/i386/support.s
index 10dfe2ffcad3..df32d006c570 100644
--- a/sys/i386/i386/support.s
+++ b/sys/i386/i386/support.s
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: support.s,v 1.30 1995/12/27 18:54:51 davidg Exp $
+ *	$Id: support.s,v 1.31 1995/12/28 23:14:40 davidg Exp $
  */
 
 #include "assym.s"				/* system definitions */
@@ -48,18 +48,6 @@ _bzero:	.long	_generic_bzero
 
 	.text
 
-/*
- * Support for reading real time clock registers
- */
-ENTRY(rtcin)					/* rtcin(val) */
-	movl	4(%esp),%eax
-	outb	%al,$0x70
-	FASTER_NOP
-	xorl	%eax,%eax
-	inb	$0x71,%al
-	FASTER_NOP
-	ret
-
 /*
  * bcopy family
  * void bzero(void *base, u_int cnt)
diff --git a/sys/i386/i386/tsc.c b/sys/i386/i386/tsc.c
index d9ae3732d30a..b4a01cee1cb9 100644
--- a/sys/i386/i386/tsc.c
+++ b/sys/i386/i386/tsc.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)clock.c	7.2 (Berkeley) 5/12/91
- *	$Id: clock.c,v 1.51 1996/01/30 18:56:47 wollman Exp $
+ *	$Id: clock.c,v 1.53 1996/03/23 21:36:03 nate Exp $
  */
 
 /*
@@ -400,6 +400,19 @@ sysbeep(int pitch, int period)
  * RTC support routines
  */
 
+int
+rtcin(reg)
+	int reg;
+{
+	u_char val;
+
+	outb(IO_RTC, reg);
+	inb(0x84);
+	val = inb(IO_RTC + 1);
+	inb(0x84);
+	return (val);
+}
+
 static __inline void
 writertc(u_char reg, u_char val)
 {
diff --git a/sys/i386/include/clock.h b/sys/i386/include/clock.h
index 867131154b95..f7ba36e95b0f 100644
--- a/sys/i386/include/clock.h
+++ b/sys/i386/include/clock.h
@@ -3,7 +3,7 @@
  * Garrett Wollman, September 1994.
  * This file is in the public domain.
  *
- *	$Id: clock.h,v 1.8 1995/12/24 08:10:49 davidg Exp $
+ *	$Id: clock.h,v 1.9 1996/01/30 18:56:24 wollman Exp $
  */
 
 #ifndef _MACHINE_CLOCK_H_
@@ -95,6 +95,7 @@ int	acquire_timer0 __P((int rate,
 int	acquire_timer2 __P((int mode));
 int	release_timer0 __P((void));
 int	release_timer2 __P((void));
+int	rtcin __P((int val));
 int	sysbeep __P((int pitch, int period));
 
 #endif /* KERNEL && !LOCORE */
diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index 756bb6584518..9e4896d80815 100644
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/include/cpufunc.h
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: cpufunc.h,v 1.46 1996/03/26 19:57:56 wollman Exp $
+ *	$Id: cpufunc.h,v 1.47 1996/03/28 20:39:45 wollman Exp $
  */
 
 /*
@@ -368,7 +368,6 @@ void	load_cr3	__P((u_long cr3));
 void	ltr		__P((u_short sel));
 u_int	rcr0		__P((void));
 u_long	rcr3		__P((void));
-int	rtcin		__P((int val));
 
 /*
  * These functions are NOT in support.s and should be declared elsewhere.
diff --git a/sys/i386/isa/clock.c b/sys/i386/isa/clock.c
index d9ae3732d30a..b4a01cee1cb9 100644
--- a/sys/i386/isa/clock.c
+++ b/sys/i386/isa/clock.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)clock.c	7.2 (Berkeley) 5/12/91
- *	$Id: clock.c,v 1.51 1996/01/30 18:56:47 wollman Exp $
+ *	$Id: clock.c,v 1.53 1996/03/23 21:36:03 nate Exp $
  */
 
 /*
@@ -400,6 +400,19 @@ sysbeep(int pitch, int period)
  * RTC support routines
  */
 
+int
+rtcin(reg)
+	int reg;
+{
+	u_char val;
+
+	outb(IO_RTC, reg);
+	inb(0x84);
+	val = inb(IO_RTC + 1);
+	inb(0x84);
+	return (val);
+}
+
 static __inline void
 writertc(u_char reg, u_char val)
 {
diff --git a/sys/isa/atrtc.c b/sys/isa/atrtc.c
index d9ae3732d30a..b4a01cee1cb9 100644
--- a/sys/isa/atrtc.c
+++ b/sys/isa/atrtc.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)clock.c	7.2 (Berkeley) 5/12/91
- *	$Id: clock.c,v 1.51 1996/01/30 18:56:47 wollman Exp $
+ *	$Id: clock.c,v 1.53 1996/03/23 21:36:03 nate Exp $
  */
 
 /*
@@ -400,6 +400,19 @@ sysbeep(int pitch, int period)
  * RTC support routines
  */
 
+int
+rtcin(reg)
+	int reg;
+{
+	u_char val;
+
+	outb(IO_RTC, reg);
+	inb(0x84);
+	val = inb(IO_RTC + 1);
+	inb(0x84);
+	return (val);
+}
+
 static __inline void
 writertc(u_char reg, u_char val)
 {