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diff --git a/palacios/src/palacios/vmm_symbol.asm b/palacios/src/palacios/vmm_symbol.asm
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+;  -*- fundamental -*-
+;;
+;; Symbol mangling macros
+;; Copyright (c) 2001, David H. Hovemeyer <daveho@cs.umd.edu>
+;;
+;; Permission is hereby granted, free of charge, to any person
+;; obtaining a copy of this software and associated documentation
+;; files (the "Software"), to deal in the Software without restriction,
+;; including without limitation the rights to use, copy, modify, merge,
+;; publish, distribute, sublicense, and/or sell copies of the Software,
+;; and to permit persons to whom the Software is furnished to do so,
+;; subject to the following conditions:
+;;
+;; The above copyright notice and this permission notice shall be
+;; included in all copies or substantial portions of the Software.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+;; ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+;; TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+;; PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+;; SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+;; FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+;; AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+;; THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+;;
+
+
+
+; This file defines macros for dealing with externally-visible
+; symbols that must be mangled for some object file formats.
+; For example, PECOFF requires a leading underscore, while
+; ELF does not.
+
+; EXPORT defines a symbol as global
+; IMPORT references a symbol defined in another module
+
+; Thanks to Christopher Giese for providing the NASM macros
+; (thus saving me hours of frustration).
+
+%ifndef __VMM_SYMBOL_ASM
+%define __VMM_SYMBOL_ASM
+
+%ifdef NEED_UNDERSCORE
+
+%macro EXPORT 1
+[GLOBAL _%1]
+%define %1 _%1
+%endmacro
+
+%macro IMPORT 1
+[EXTERN _%1]
+%define %1 _%1
+%endmacro
+
+%else
+
+%macro EXPORT 1
+[GLOBAL %1]
+%endmacro
+
+%macro IMPORT 1
+[EXTERN %1]
+%endmacro
+
+%endif
+
+%endif