1 files changed, 64 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange32.S b/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange32.S
new file mode 100644
index 0000000000..43bb92526e
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange32.S
@@ -0,0 +1,64 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 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:
+#
+#   InterlockedCompareExchange32.Asm
+#
+# Abstract:
+#
+#   InterlockedCompareExchange32 function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+
+     
+
+#------------------------------------------------------------------------------
+# VOID *
+# EFIAPI
+# InterlockedCompareExchangePointer (
+#   IN      VOID                      **Value,
+#   IN      VOID                      *CompareValue,
+#   IN      VOID                      *ExchangeValue
+#   );
+#------------------------------------------------------------------------------
+.global _InterlockedCompareExchangePointer
+_InterlockedCompareExchangePointer: 
+    #
+    # InterlockedCompareExchangePointer() shares the same code as
+    # InterlockedCompareExchange32() on IA32 and thus no code inside this
+    # function
+    #
+
+
+#------------------------------------------------------------------------------
+# UINT32
+# EFIAPI
+# InterlockedCompareExchange32 (
+#   IN      UINT32                    *Value,
+#   IN      UINT32                    CompareValue,
+#   IN      UINT32                    ExchangeValue
+#   );
+#------------------------------------------------------------------------------
+.global _InterlockedCompareExchange32
+_InterlockedCompareExchange32: 
+    movl    4(%esp),%ecx
+    movl    8(%esp),%eax
+    movl    12(%esp),%edx
+    lock    cmpxchgl %edx,(%ecx)
+    ret
+
+
+