v4.19.13 snapshot.
diff --git a/arch/powerpc/kernel/firmware.c b/arch/powerpc/kernel/firmware.c
new file mode 100644
index 0000000..2eae447
--- /dev/null
+++ b/arch/powerpc/kernel/firmware.c
@@ -0,0 +1,22 @@
+/*
+ * Extracted from cputable.c
+ *
+ * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
+ *
+ * Modifications for ppc64:
+ * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
+ * Copyright (C) 2005 Stephen Rothwell, IBM Corporation
+ *
+ * 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 (at your option) any later version.
+ */
+
+#include <linux/export.h>
+#include <linux/cache.h>
+
+#include <asm/firmware.h>
+
+unsigned long powerpc_firmware_features __read_mostly;
+EXPORT_SYMBOL_GPL(powerpc_firmware_features);