From 8a92c52a84ab17738ae7cf73946ee49df3cd9efc Mon Sep 17 00:00:00 2001
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sat, 25 Nov 2017 22:43:52 +0000
Subject: [PATCH] On AIM systems, it is not actually possible to stop the CPU
 timer, so we just set it to a large default value (and inherit any previously
 existing value), hoping it never turns over. Instead, silently allow spurious
 one-shots from rollovers.

MFC after:	10 days
---
 sys/powerpc/powerpc/clock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/powerpc/powerpc/clock.c b/sys/powerpc/powerpc/clock.c
index 7bd92e64821..7ddd5147237 100644
--- a/sys/powerpc/powerpc/clock.c
+++ b/sys/powerpc/powerpc/clock.c
@@ -141,6 +141,9 @@ decr_intr(struct trapframe *frame)
 	} else if (s->mode == 2) {
 		nticks = 1;
 		decr_et_stop(NULL);
+	} else if (s->mode == 0) {
+		/* Potemkin timer ran out without an event. Just reset it. */
+		decr_et_stop(NULL);
 	}
 
 	while (nticks-- > 0) {