+#------------------------------------------------------------------------------
+#
+# 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:
+#
+# CopyMem.Asm
+#
+# Abstract:
+#
+# CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+ .386:
+ .code:
+
+.global InternalMemCopyMem
+InternalMemCopyMem:
+ push %esi
+ push %edi
+ movl 16(%esp),%esi # esi <- Source
+ movl 12(%esp),%edi # edi <- Destination
+ movl 20(%esp),%edx # edx <- Count
+ leal -1(%edi,%edx),%eax # eax <- End of Destination
+ cmpl %edi,%esi
+ jae L0
+ cmpl %esi,%eax
+ jae @CopyBackward # Copy backward if overlapped
+L0:
+ movl %edx,%ecx
+ andl $3,%edx
+ shrl $2,%ecx
+ rep
+ movsl # Copy as many Dwords as possible
+ jmp @CopyBytes
+@CopyBackward:
+ movl %eax,%edi # edi <- End of Destination
+ leal -1(%esi,%edx),%esi # esi <- End of Source
+ std
+@CopyBytes:
+ movl %edx,%ecx
+ rep
+ movsb # Copy bytes backward
+ cld
+ movl 12(%esp),%eax # eax <- Destination as return value
+ push %edi
+ push %esi
+ ret