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diff --git a/sys/powerpc/include/platformvar.h b/sys/powerpc/include/platformvar.h
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+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2005 Peter Grehan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_PLATFORMVAR_H_
+#define _MACHINE_PLATFORMVAR_H_
+
+/*
+ * A PowerPC platform implementation is declared with a kernel object and
+ * an associated method table, similar to a device driver.
+ *
+ * e.g.
+ *
+ * static platform_method_t chrp_methods[] = {
+ *	PLATFORMMETHOD(platform_probe,		chrp_probe),
+ *	PLATFORMMETHOD(platform_mem_regions,	ofw_mem_regions),
+ *  ...
+ *	PLATFORMMETHOD(platform_smp_first_cpu,	chrp_smp_first_cpu),
+ *	{ 0, 0 }
+ * };
+ *
+ * static platform_def_t chrp_platform = {
+ * 	"chrp",
+ *	chrp_methods,
+ *	sizeof(chrp_platform_softc),	// or 0 if no softc
+ * };
+ *
+ * PLATFORM_DEF(chrp_platform);
+ */
+
+#include <sys/kobj.h>
+
+struct platform_kobj {
+	/*
+	 * A platform instance is a kernel object
+	 */
+	KOBJ_FIELDS;
+
+	/*
+	 * Utility elements that an instance may use
+	 */
+	struct mtx	platform_mtx;	/* available for instance use */
+	void		*platform_iptr;	/* instance data pointer */
+
+	/*
+	 * Opaque data that can be overlaid with an instance-private
+	 * structure. Platform code can test that this is large enough at
+	 * compile time with a sizeof() test againt it's softc. There
+	 * is also a run-time test when the platform kernel object is
+	 * registered.
+	 */
+#define PLATFORM_OPAQUESZ	64
+	u_int		platform_opaque[PLATFORM_OPAQUESZ];
+};
+
+typedef struct platform_kobj	*platform_t;
+typedef struct kobj_class	platform_def_t;
+#define platform_method_t	kobj_method_t
+
+#define PLATFORMMETHOD		KOBJMETHOD
+#define	PLATFORMMETHOD_END	KOBJMETHOD_END
+
+#define PLATFORM_DEF(name)	DATA_SET(platform_set, name)
+
+#endif /* _MACHINE_PLATFORMVAR_H_ */