From b9610b9cb5b34b202251d8e08c02a788240e4cdd Mon Sep 17 00:00:00 2001
From: xdu2 <xdu2@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 25 Aug 2011 05:59:17 +0000
Subject: Add new API GetTimeInNanoSecond() to TimerLib to convert elapsed
 ticks to time in unit of nanoseconds.

Signed-off-by: xdu2
Reviewed-by: mdkinney

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12206 6f19259b-4bc3-4df7-8a09-765794883524
---
 DuetPkg/Library/DuetTimerLib/X86TimerLib.c | 40 ++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

(limited to 'DuetPkg')

diff --git a/DuetPkg/Library/DuetTimerLib/X86TimerLib.c b/DuetPkg/Library/DuetTimerLib/X86TimerLib.c
index edcfb83895..ca3890c300 100644
--- a/DuetPkg/Library/DuetTimerLib/X86TimerLib.c
+++ b/DuetPkg/Library/DuetTimerLib/X86TimerLib.c
@@ -4,9 +4,9 @@
   ACPI power management timer is a 24-bit or 32-bit fixed rate free running count-up
   timer that runs off a 3.579545 MHz clock. 
   When startup, Duet will check the FADT to determine whether the PM timer is a 
-  32-bit or 25-bit timer.
+  32-bit or 24-bit timer.
 
-  Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -243,3 +243,39 @@ GetPerformanceCounterProperties (
 
   return 3579545;
 }
+
+/**
+  Converts elapsed ticks of performance counter to time in nanoseconds.
+
+  This function converts the elapsed ticks of running performance counter to
+  time value in unit of nanoseconds.
+
+  @param  Ticks     The number of elapsed ticks of running performance counter.
+
+  @return The elapsed time in nanoseconds.
+
+**/
+UINT64
+EFIAPI
+GetTimeInNanoSecond (
+  IN      UINT64                     Ticks
+  )
+{
+  UINT64  NanoSeconds;
+  UINT32  Remainder;
+
+  //
+  //          Ticks
+  // Time = --------- x 1,000,000,000
+  //        Frequency
+  //
+  NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, 3579545, &Remainder), 1000000000u);
+
+  //
+  // Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * 1,000,000,000)
+  // will not overflow 64-bit.
+  //
+  NanoSeconds += DivU64x32 (MultU64x32 ((UINT64) Remainder, 1000000000u), 3579545);
+
+  return NanoSeconds;
+}
-- 
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