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diff --git a/geekos/src/geekos/symbol.asm b/geekos/src/geekos/symbol.asm
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+++ b/geekos/src/geekos/symbol.asm
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+; Symbol mangling macros
+; Copyright (c) 2001, David H. Hovemeyer <daveho@cs.umd.edu>
+; $Revision: 1.2 $
+
+; 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