From 5b491514ecfefc9a4b11cac789ec3a8e5b8f13f2 Mon Sep 17 00:00:00 2001
From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 28 Jun 2011 11:41:34 +0000
Subject: [PATCH] ArmPkg/BdsLib: Check if the performance timer is counting
 down or up in PrintPerformance()

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11914 6f19259b-4bc3-4df7-8a09-765794883524
---
 ArmPkg/Library/BdsLib/BdsHelper.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/ArmPkg/Library/BdsLib/BdsHelper.c b/ArmPkg/Library/BdsLib/BdsHelper.c
index fa9483ea81..a006e90db4 100644
--- a/ArmPkg/Library/BdsLib/BdsHelper.c
+++ b/ArmPkg/Library/BdsLib/BdsHelper.c
@@ -259,8 +259,14 @@ PrintPerformance (
   UINTN       Index;
   CHAR8       Buffer[100];
   UINTN       CharCount;
+  BOOLEAN     CountUp;
 
-  TicksPerSecond = GetPerformanceCounterProperties (NULL, NULL);
+  TicksPerSecond = GetPerformanceCounterProperties (&Start, &Stop);
+  if (Start < Stop) {
+    CountUp = TRUE;
+  } else {
+    CountUp = FALSE;
+  }
 
   TimeStamp = 0;
   Key       = 0;
@@ -269,7 +275,7 @@ PrintPerformance (
     if (Key != 0) {
       for (Index = 0; mTokenList[Index] != NULL; Index++) {
         if (AsciiStriCmp (mTokenList[Index], Token) == 0) {
-          Delta = Start - Stop;
+          Delta = CountUp?(Stop - Start):(Start - Stop);
           TimeStamp += Delta;
           Milliseconds = DivU64x64Remainder (MultU64x32 (Delta, 1000), TicksPerSecond, NULL);
           CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"%6a %6ld ms\n", Token, Milliseconds);