diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c
index fc8f6c78899a..e2be60391b63 100644
--- a/sys/kern/kern_time.c
+++ b/sys/kern/kern_time.c
@@ -207,9 +207,13 @@ kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
 
 	p = td->td_proc;
 	switch (clock_id) {
-	case CLOCK_REALTIME:
+	case CLOCK_REALTIME:		/* Default to precise. */
+	case CLOCK_REALTIME_PRECISE:
 		nanotime(ats);
 		break;
+	case CLOCK_REALTIME_FAST:
+		getnanotime(ats);
+		break;
 	case CLOCK_VIRTUAL:
 		PROC_LOCK(p);
 		calcru(p, &user, &sys);
@@ -223,10 +227,20 @@ kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
 		timevaladd(&user, &sys);
 		TIMEVAL_TO_TIMESPEC(&user, ats);
 		break;
-	case CLOCK_MONOTONIC:
+	case CLOCK_MONOTONIC:		/* Default to precise. */
+	case CLOCK_MONOTONIC_PRECISE:
 	case CLOCK_UPTIME:
+	case CLOCK_UPTIME_PRECISE:
 		nanouptime(ats);
 		break;
+	case CLOCK_UPTIME_FAST:
+	case CLOCK_MONOTONIC_FAST:
+		getnanouptime(ats);
+		break;
+	case CLOCK_SECOND:
+		ats->tv_sec = time_second;
+		ats->tv_nsec = 0;
+		break;
 	default:
 		return (EINVAL);
 	}
@@ -307,8 +321,14 @@ kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
 	ts->tv_sec = 0;
 	switch (clock_id) {
 	case CLOCK_REALTIME:
+	case CLOCK_REALTIME_FAST:
+	case CLOCK_REALTIME_PRECISE:
 	case CLOCK_MONOTONIC:
+	case CLOCK_MONOTONIC_FAST:
+	case CLOCK_MONOTONIC_PRECISE:
 	case CLOCK_UPTIME:
+	case CLOCK_UPTIME_FAST:
+	case CLOCK_UPTIME_PRECISE:
 		/*
 		 * Round up the result of the division cheaply by adding 1.
 		 * Rounding up is especially important if rounding down
@@ -321,6 +341,10 @@ kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
 		/* Accurately round up here because we can do so cheaply. */
 		ts->tv_nsec = (1000000000 + hz - 1) / hz;
 		break;
+	case CLOCK_SECOND:
+		ts->tv_sec = 1;
+		ts->tv_nsec = 0;
+		break;
 	default:
 		return (EINVAL);
 	}
diff --git a/sys/sys/time.h b/sys/sys/time.h
index 60f9543db0a1..657f0d49b409 100644
--- a/sys/sys/time.h
+++ b/sys/sys/time.h
@@ -238,7 +238,14 @@ struct clockinfo {
 #define CLOCK_VIRTUAL	1
 #define CLOCK_PROF	2
 #define CLOCK_MONOTONIC	4
-#define CLOCK_UPTIME	5
+#define CLOCK_UPTIME	5		/* FreeBSD-specific. */
+#define CLOCK_UPTIME_PRECISE	7	/* FreeBSD-specific. */
+#define CLOCK_UPTIME_FAST	8	/* FreeBSD-specific. */
+#define CLOCK_REALTIME_PRECISE	9	/* FreeBSD-specific. */
+#define CLOCK_REALTIME_FAST	10	/* FreeBSD-specific. */
+#define CLOCK_MONOTONIC_PRECISE	11	/* FreeBSD-specific. */
+#define CLOCK_MONOTONIC_FAST	12	/* FreeBSD-specific. */
+#define CLOCK_SECOND	13		/* FreeBSD-specific. */
 #endif
 
 #ifndef TIMER_ABSTIME