1 files changed, 49 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo64.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo64.c
new file mode 100644
index 0000000..9b1f081
--- /dev/null
+++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo64.c
@@ -0,0 +1,49 @@
+/*++
+
+Copyright (c) 2004 - 2006, Intel Corporation                                                         
+All rights reserved. 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        
+http://opensource.org/licenses/bsd-license.php                                            
+                                                                                          
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.  
+
+
+Module Name:
+
+  GetPowerOfTwo64.c
+
+Abstract: 
+
+  Math worker functions.
+
+--*/
+
+#include "BaseLibInternal.h"
+
+/**
+  Returns the value of the highest bit set in a 64-bit value. Equivalent to
+  1 << HighBitSet64(x).
+
+  This function computes the value of the highest bit set in the 64-bit value
+  specified by Operand. If Operand is zero, then zero is returned.
+
+  @param  Operand The 64-bit operand to evaluate.
+
+  @return 1 << HighBitSet64(Operand)
+  @retval 0 Operand is zero.
+
+**/
+UINT64
+EFIAPI
+GetPowerOfTwo64 (
+  IN      UINT64                    Operand
+  )
+{
+  if (Operand == 0) {
+    return 0;
+  }
+
+  return LShiftU64 (1, HighBitSet64 (Operand));
+}