[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/include/ipxe/errfile.h

@@ -213,6 +213,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #define ERRFILE_login_ui	      ( ERRFILE_OTHER | 0x00170000 )
 #define ERRFILE_ib_srpboot	      ( ERRFILE_OTHER | 0x00180000 )
 #define ERRFILE_iwmgmt		      ( ERRFILE_OTHER | 0x00190000 )
+#define ERRFILE_linux_smbios	      ( ERRFILE_OTHER | 0x001a0000 )
 
 /** @} */
 

src/include/ipxe/linux/linux_smbios.h

@@ -0,0 +1,18 @@
+#ifndef _IPXE_LINUX_SMBIOS_H
+#define _IPXE_LINUX_SMBIOS_H
+
+/** @file
+ *
+ * iPXE SMBIOS API for linux
+ *
+ */
+
+FILE_LICENCE(GPL2_OR_LATER);
+
+#ifdef SMBIOS_LINUX
+#define SMBIOS_PREFIX_linux
+#else
+#define SMBIOS_PREFIX_linux __linux_
+#endif
+
+#endif /* _IPXE_LINUX_SMBIOS_H */

src/include/ipxe/smbios.h

@@ -26,6 +26,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 /* Include all architecture-independent SMBIOS API headers */
 #include <ipxe/efi/efi_smbios.h>
+#include <ipxe/linux/linux_smbios.h>
 
 /* Include all architecture-dependent SMBIOS API headers */
 #include <bits/smbios.h>