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diff --git a/contrib/syslinux-4.02/memdisk/acpi.h b/contrib/syslinux-4.02/memdisk/acpi.h
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+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ * This file derived almost in its entirety from gPXE.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/** @file
+ *
+ * ACPI data structures
+ *
+ */
+
+#include <stdint.h>
+
+/**
+ * An ACPI description header
+ *
+ * This is the structure common to the start of all ACPI system
+ * description tables.
+ */
+MEMDISK_PACKED_PREFIX
+struct acpi_description_header {
+ /** ACPI signature (4 ASCII characters) */
+ char signature[4];
+ /** Length of table, in bytes, including header */
+ uint32_t length;
+ /** ACPI Specification minor version number */
+ uint8_t revision;
+ /** To make sum of entire table == 0 */
+ uint8_t checksum;
+ /** OEM identification */
+ char oem_id[6];
+ /** OEM table identification */
+ char oem_table_id[8];
+ /** OEM revision number */
+ uint32_t oem_revision;
+ /** ASL compiler vendor ID */
+ char asl_compiler_id[4];
+ /** ASL compiler revision number */
+ uint32_t asl_compiler_revision;
+} MEMDISK_PACKED_POSTFIX;
+