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diff --git a/include/physmem.h b/include/physmem.h
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+/*
+ * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+/*
+ * These functions work like memset but operate on physical memory which may
+ * not be accessible directly.
+ *
+ * @param s The physical address to start setting memory at.
+ * @param c The character to set each byte of the region to.
+ * @param n The number of bytes to set.
+ *
+ * @return The physical address of the memory which was set.
+ */
+phys_addr_t arch_phys_memset(phys_addr_t s, int c, phys_size_t n);