diff --git a/sys/dev/twe/twe.c b/sys/dev/twe/twe.c
index 340dab931e64..6ee9db538416 100644
--- a/sys/dev/twe/twe.c
+++ b/sys/dev/twe/twe.c
@@ -500,9 +500,25 @@ twe_ioctl(struct twe_softc *sc, int ioctlcmd, void *addr)
     struct twe_request		*tr;
     u_int8_t			srid;
     int				s, error;
+#ifdef __amd64__
+    struct twe_paramcommand32	*tp32 = (struct twe_paramcommand32 *)addr;
+    struct twe_usercommand32	*tu32 = (struct twe_usercommand32 *)addr;
+    struct twe_paramcommand	tp_swab;
+    struct twe_usercommand	tu_swab;
+#endif
 
     error = 0;
     switch(ioctlcmd) {
+
+#ifdef __amd64__
+    case TWEIO_COMMAND32:
+	tu_swab.tu_command = tu32->tu_command;
+	tu_swab.tu_data = (void *)(uintptr_t)tu32->tu_data;
+	tu_swab.tu_size = tu32->tu_size;
+	tu = &tu_swab;
+	/* FALLTHROUGH */
+#endif
+
 	/* handle a command from userspace */
     case TWEIO_COMMAND:
 	/* get a request */
@@ -588,6 +604,16 @@ twe_ioctl(struct twe_softc *sc, int ioctlcmd, void *addr)
 	splx(s);
 	break;
 
+#ifdef __amd64__
+    case TWEIO_GET_PARAM32:
+	tp_swab.tp_table_id = tp32->tp_table_id;
+	tp_swab.tp_param_id = tp32->tp_param_id;
+	tp_swab.tp_data = (void *)(uintptr_t)tp32->tp_data;
+	tp_swab.tp_size = tp32->tp_size;
+	tp = &tp_swab;
+	/* FALLTHROUGH */
+#endif
+
     case TWEIO_GET_PARAM:
 	if ((param = twe_get_param(sc, tp->tp_table_id, tp->tp_param_id, tp->tp_size, NULL)) == NULL) {
 	    twe_printf(sc, "TWEIO_GET_PARAM failed for 0x%x/0x%x/%d\n", 
@@ -605,6 +631,16 @@ twe_ioctl(struct twe_softc *sc, int ioctlcmd, void *addr)
 	}
 	break;
 
+#ifdef __amd64__
+    case TWEIO_SET_PARAM32:
+	tp_swab.tp_table_id = tp32->tp_table_id;
+	tp_swab.tp_param_id = tp32->tp_param_id;
+	tp_swab.tp_data = (void *)(uintptr_t)tp32->tp_data;
+	tp_swab.tp_size = tp32->tp_size;
+	tp = &tp_swab;
+	/* FALLTHROUGH */
+#endif
+
     case TWEIO_SET_PARAM:
 	if ((data = malloc(tp->tp_size, M_DEVBUF, M_WAITOK)) == NULL) {
 	    error = ENOMEM;
diff --git a/sys/dev/twe/tweio.h b/sys/dev/twe/tweio.h
index 1b78472495ab..43f707b52213 100644
--- a/sys/dev/twe/tweio.h
+++ b/sys/dev/twe/tweio.h
@@ -44,6 +44,17 @@ struct twe_usercommand {
 
 #define TWEIO_COMMAND		_IOWR('T', 100, struct twe_usercommand)
 
+#ifdef __amd64__
+struct twe_usercommand32 {
+    TWE_Command	tu_command;	/* command ready for the controller */
+    uint32_t	tu_data;	/* pointer to data in userspace */
+    uint32_t	tu_size;	/* userspace data length */
+};
+
+#define TWEIO_COMMAND32		_IOWR('T', 100, struct twe_usercommand32)
+#endif
+
+
 /*
  * Command queue statistics
  */
@@ -89,6 +100,18 @@ struct twe_paramcommand {
 #define TWEIO_SET_PARAM		_IOW ('T', 104, struct twe_paramcommand)
 #define TWEIO_GET_PARAM		_IOW ('T', 105, struct twe_paramcommand)
 
+#ifdef __amd64__
+struct twe_paramcommand32 {
+    u_int16_t	tp_table_id;
+    u_int8_t	tp_param_id;
+    u_int32_t	tp_data;
+    u_int8_t	tp_size;
+};
+
+#define TWEIO_SET_PARAM32	_IOW ('T', 104, struct twe_paramcommand32)
+#define TWEIO_GET_PARAM32	_IOW ('T', 105, struct twe_paramcommand32)
+#endif
+
 /*
  * Request a controller soft-reset
  */