Calibrate the processor cycle counter instead of believing what the

firmware says.

2 files changed, 28 insertions, 1 deletions

diff --git a/sys/dev/dec/mcclock.c b/sys/dev/dec/mcclock.c
index 3aada8b83a8d..fc06f829e3d9 100644
--- a/sys/dev/dec/mcclock.c
+++ b/sys/dev/dec/mcclock.c
@@ -1,4 +1,4 @@
-/* $Id: mcclock.c,v 1.1 1998/06/10 10:56:23 dfr Exp $ */
+/* $Id: mcclock.c,v 1.2 1998/06/14 13:45:41 dfr Exp $ */
 /* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
 
 /*
@@ -111,3 +111,29 @@ mcclock_set(device_t dev, struct clocktime *ct)
 	MC146818_PUTTOD(dev, &regs);
 	splx(s);
 }
+
+int
+mcclock_getsecs(device_t dev, int *secp)
+{
+	int timeout = 100000000;
+	int sec;
+	int s;
+
+	s = splclock();
+	for (;;) {
+		if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) {
+			sec = MCCLOCK_READ(dev, MC_SEC);
+			break;
+		}
+		if (--timeout == 0)
+			goto fail;
+	}
+
+	splx(s);
+	*secp = sec;
+	return 0;
+
+ fail:
+	splx(s);
+	return ETIMEDOUT;
+}
diff --git a/sys/dev/dec/mcclockvar.h b/sys/dev/dec/mcclockvar.h
index 0c9f5df8d816..a38f632feac5 100644
--- a/sys/dev/dec/mcclockvar.h
+++ b/sys/dev/dec/mcclockvar.h
@@ -33,3 +33,4 @@ void	mcclock_attach(device_t dev);
 void	mcclock_init(device_t);
 void	mcclock_get(device_t, time_t, struct clocktime *);
 void	mcclock_set(device_t, struct clocktime *);
+int	mcclock_getsecs(device_t dev, int *secp);