From 8aa163da5ac7bf40d1a3b0612a46504dc56d16a2 Mon Sep 17 00:00:00 2001
From: darylm503 <darylm503@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 11 Nov 2011 00:32:31 +0000
Subject: StdLib: Eliminate TimerLib dependencies.

Implement the clock() function using the EFI time-of-day clock instead of a TimerLib instance.

Signed-off-by: darylm503
Reviewed-by: jljusten
Reviewed-by: geekboy15a


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12683 6f19259b-4bc3-4df7-8a09-765794883524
---
 StdLib/LibC/Time/Time.c | 50 ++++++++++++++++++++++---------------------------
 1 file changed, 22 insertions(+), 28 deletions(-)

(limited to 'StdLib/LibC/Time/Time.c')

diff --git a/StdLib/LibC/Time/Time.c b/StdLib/LibC/Time/Time.c
index e3eccb593b..0296a5dc93 100644
--- a/StdLib/LibC/Time/Time.c
+++ b/StdLib/LibC/Time/Time.c
@@ -180,34 +180,6 @@ timesub(
 
 /* ###############  Time Manipulation Functions  ########################## */
 
-/** The clock function determines the processor time used.
-
-    @return   The clock function returns the implementation's best
-              approximation to the processor time used by the program since the
-              beginning of an implementation-defined era related only to the
-              program invocation.  To determine the time in seconds, the value
-              returned by the clock function should be divided by the value of
-              the macro CLOCKS_PER_SEC.  If the processor time used is not
-              available or its value cannot be represented, the function
-              returns the value (clock_t)(-1).
-
-              On IA32 or X64 platforms, the value returned is the number of
-              CPU TimeStamp Counter ticks since the appliation started.
-**/
-clock_t
-clock(void)
-{
-#ifndef NT32dvm
-  clock_t   temp;
-
-  temp = (clock_t)GetPerformanceCounter();
-
-  return temp - gMD->AppStartTime;
-#else
-  return (clock_t)-1;
-#endif  /* NT32dvm */
-}
-
 /**
 **/
 double
@@ -591,6 +563,28 @@ time(time_t *timer)
   return CalTime;   // Return calendar time in microseconds
 }
 
+/** The clock function determines the processor time used.
+
+    @return   The clock function returns the implementation's best
+              approximation to the processor time used by the program since the
+              beginning of an implementation-defined era related only to the
+              program invocation.  To determine the time in seconds, the value
+              returned by the clock function should be divided by the value of
+              the macro CLOCKS_PER_SEC.  If the processor time used is not
+              available or its value cannot be represented, the function
+              returns the value (clock_t)(-1).
+**/
+clock_t
+clock(void)
+{
+  clock_t   retval;
+  time_t    temp;
+
+  temp = time(NULL);
+  retval = ((clock_t)((UINT32)temp)) - gMD->AppStartTime;
+  return retval;
+}
+
 /* #################  Time Conversion Functions  ########################## */
 /*
     Except for the strftime function, these functions each return a pointer to
-- 
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