PERFORCE change 29892 for review

[Marcel Moolenaar]

http://perforce.freebsd.org/chv.cgi?CH=29892

Change 29892 by marcel at marcel_pluto2 on 2003/04/27 13:36:37

	Step 1: Properly announce a constant timer as a bad timer. A
		constant timer is one that is both monotonically
		increasing and monotonically decreasing at the same
		time.
	
	This fixes the announcement on the HP rx2600 where we basicly
	read a bogus register due to not properly using the v2 ACPI
	tables and invariable read the same value. We were quite happy
	with this even if it made time stop completely when booting a
	SMP kernel. The 100% CPU usage for ntpd in an attempt to make
	time advance didn't make us unhappy. Except Kerberos: the time
	skew prevented logging in...
	
	Step 2 is to fix getting the ACPI timer info from the tables.
	This is in progress...

Affected files ...

.. //depot/projects/ia64/sys/dev/acpica/acpi_timer.c#9 edit

Differences ...

==== //depot/projects/ia64/sys/dev/acpica/acpi_timer.c#9 (text+ko) ====

@@ -129,14 +129,14 @@
 	}
 	if (max - min > 2)
 		n = 0;
-	else if (min < 0)
+	else if (min < 0 || max == 0)
 		n = 0;
 	else
 		n = 1;
 	if (bootverbose)
 		printf("ACPI timer looks %s min = %d, max = %d, width = %d\n",
 			n ? "GOOD" : "BAD ",
-			min, max, max - min + 1);
+			min, max, max - min);
 	return (n);
 }