1 files changed, 41 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/HighBitSet32.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/HighBitSet32.c
new file mode 100644
index 00000000..80e6b1c7
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/HighBitSet32.c
@@ -0,0 +1,41 @@
+/** @file
+  Math worker functions.
+
+  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+
+
+#include "BaseLibInternals.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.
+
+  @retval 0..31  Position of the highest bit set in Operand if found.
+  @retval -1     Operand is zero.
+
+**/
+INTN
+EFIAPI
+HighBitSet32 (
+  IN      UINT32                    Operand
+  )
+{
+  INTN                              BitIndex;
+
+  if (Operand == 0) {
+    return - 1;
+  }
+  for (BitIndex = 31; (INT32)Operand > 0; BitIndex--, Operand <<= 1);
+  return BitIndex;
+}