1 files changed, 49 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/HighBitSet32.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/HighBitSet32.c
new file mode 100644
index 0000000..7db1a02
--- /dev/null
+++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/HighBitSet32.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:
+
+  HighBitSet32.c
+  
+Abstract: 
+
+  Math worker functions.
+
+--*/
+
+#include "BaseLibInternal.h"
+
+/**
+  Returns the bit position of the highest bit set in a 32-bit value. Equivalent
+  to log2(x).
+
+  This function computes the bit position of the highest bit set in the 32-bit
+  value specified by Operand. If Operand is zero, then -1 is returned.
+  Otherwise, a value between 0 and 31 is returned.
+
+  @param  Operand The 32-bit operand to evaluate.
+
+  @return Position of the highest bit set in Operand if found.
+  @retval -1  Operand is zero.
+
+**/
+INTN
+EFIAPI
+HighBitSet32 (
+  IN      UINT32                    Operand
+  )
+{
+  INTN                              BitIndex;
+
+  for (BitIndex = -1; Operand != 0; BitIndex++, Operand >>= 1);
+  return BitIndex;
+}