[linux] Add empty smbios

There exists an smbios userspace library so implementing this is
probably possible, but doesn't seem really important to have in
userspace.  Hence provide a dummy implementation returning an error.

Signed-off-by: Piotr Jaroszyński <p.jaroszynski@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/interface/linux/linux_smbios.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+FILE_LICENCE(GPL2_OR_LATER);
+
+#include <errno.h>
+#include <ipxe/smbios.h>
+
+/**
+ * Find SMBIOS
+ *
+ * Not implemented currently.
+ *
+ * @v smbios		SMBIOS entry point descriptor structure to fill in
+ * @ret rc		Return status code
+ */
+static int linux_find_smbios(struct smbios *smbios __unused)
+{
+	return -ENODEV;
+}
+
+PROVIDE_SMBIOS(linux, find_smbios, linux_find_smbios);