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diff --git a/sys/arm/include/platform.h b/sys/arm/include/platform.h
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+/*-
+ * Copyright (c) 2014 Andrew Turner
+ * 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_PLATFORM_H_
+#define	_MACHINE_PLATFORM_H_
+
+/*
+ * Initialization functions called by the common initarm() function in
+ * arm/machdep.c (but not necessarily from the custom initarm() functions of
+ * older code).
+ *
+ *  - platform_probe_and_attach() is called very early, after parsing the boot
+ *    params and after physical memory has been located and sized.
+ *
+ *  - platform_devmap_init() is called as one of the last steps of early virtual
+ *    memory initialization, shortly before the new page tables are installed.
+ *
+ *  - platform_lastaddr() is called after platform_devmap_init(), and must return
+ *    the address of the first byte of unusable KVA space.  This allows a
+ *    platform to carve out of the top of the KVA space whatever reserves it
+ *    needs for things like static device mapping, and this is called to get the
+ *    value before calling pmap_bootstrap() which uses the value to size the
+ *    available KVA.
+ *
+ *  - platform_gpio_init() is called after the static device mappings are
+ *    established and just before cninit().  The intention is that the routine
+ *    can do any hardware setup (such as gpio or pinmux) necessary to make the
+ *    console functional.
+ *
+ *  - platform_late_init() is called just after cninit().  This is the first of
+ *    the init routines that can use printf() and expect the output to appear on
+ *    a standard console.
+ *
+ */
+void platform_probe_and_attach(void);
+int platform_devmap_init(void);
+vm_offset_t platform_lastaddr(void);
+void platform_gpio_init(void);
+void platform_late_init(void);
+
+#endif	/* _MACHINE_PLATFORM_H_ */