[smbios] Provide a null SMBIOS API for platforms with no concept of SMBIOS
Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/core/null_smbios.c b/src/core/null_smbios.c
new file mode 100644
index 0000000..d46aab3
--- /dev/null
+++ b/src/core/null_smbios.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * 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 Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/**
+ * @file
+ *
+ * Null SMBIOS API
+ *
+ */
+
+#include <errno.h>
+#include <ipxe/smbios.h>
+
+/**
+ * Find SMBIOS
+ *
+ * @v smbios SMBIOS entry point descriptor structure to fill in
+ * @ret rc Return status code
+ */
+static int null_find_smbios ( struct smbios *smbios __unused ) {
+
+ return -ENOTSUP;
+}
+
+PROVIDE_SMBIOS ( null, find_smbios, null_find_smbios );
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index 6183e5b..48b35c5 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -83,6 +83,7 @@
#define ERRFILE_efi_path ( ERRFILE_CORE | 0x002b0000 )
#define ERRFILE_efi_mp ( ERRFILE_CORE | 0x002c0000 )
#define ERRFILE_efi_service ( ERRFILE_CORE | 0x002d0000 )
+#define ERRFILE_null_smbios ( ERRFILE_CORE | 0x002e0000 )
#define ERRFILE_eisa ( ERRFILE_DRIVER | 0x00000000 )
#define ERRFILE_isa ( ERRFILE_DRIVER | 0x00010000 )
diff --git a/src/include/ipxe/null_smbios.h b/src/include/ipxe/null_smbios.h
new file mode 100644
index 0000000..c430dd0
--- /dev/null
+++ b/src/include/ipxe/null_smbios.h
@@ -0,0 +1,18 @@
+#ifndef _IPXE_NULL_SMBIOS_H
+#define _IPXE_NULL_SMBIOS_H
+
+/** @file
+ *
+ * Null SMBIOS API
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#ifdef SMBIOS_NULL
+#define SMBIOS_PREFIX_null
+#else
+#define SMBIOS_PREFIX_null __null_
+#endif
+
+#endif /* _IPXE_NULL_SMBIOS_H */
diff --git a/src/include/ipxe/smbios.h b/src/include/ipxe/smbios.h
index 077a67a..f36a5ad 100644
--- a/src/include/ipxe/smbios.h
+++ b/src/include/ipxe/smbios.h
@@ -25,6 +25,7 @@
PROVIDE_SINGLE_API ( SMBIOS_PREFIX_ ## _subsys, _api_func, _func )
/* Include all architecture-independent SMBIOS API headers */
+#include <ipxe/null_smbios.h>
#include <ipxe/efi/efi_smbios.h>
#include <ipxe/linux/linux_smbios.h>
