From: Alexander Kudryavtsev <alexk@ispras.ru>
Date: Fri, 17 Feb 2012 20:25:41 +0000 (-0600)
Subject: Handle 8254 PIT reload count of 0 correctly (means 65536)
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=b6731d8c63a50ae8083edb56a9a726957910ec64;p=palacios.git

Handle 8254 PIT reload count of 0 correctly (means 65536)
---

diff --git a/palacios/src/devices/8254.c b/palacios/src/devices/8254.c
index 1a44399..5944cfa 100644
--- a/palacios/src/devices/8254.c
+++ b/palacios/src/devices/8254.c
@@ -177,10 +177,11 @@ static int handle_crystal_tics(struct pit * pit, struct channel * ch, uint_t osc
 	    reload_val -= reload_val % 2;
 	}
 
-	// TODO: Check this....
-	// Is this correct???
 	if (reload_val == 0) {
-	    reload_val = 1;
+	    // This means the value is being set to 0x10000
+	    // but due to the tick after the reload, it wraps
+	    // down to 0xffff
+	    reload_val = 0xffff;
 	}
 
 	channel_cycles += oscillations / reload_val;