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diff --git a/sys/arm64/include/acpica_machdep.h b/sys/arm64/include/acpica_machdep.h
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index 000000000000..9a3434a2bbab
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+++ b/sys/arm64/include/acpica_machdep.h
@@ -0,0 +1,55 @@
+/*-
+ * Copyright (c) 2002 Mitsuru IWASAKI
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+/******************************************************************************
+ *
+ * Name: acpica_machdep.h - arch-specific defines, etc.
+ *       $Revision$
+ *
+ *****************************************************************************/
+
+#ifndef __ACPICA_MACHDEP_H__
+#define	__ACPICA_MACHDEP_H__
+
+
+#ifdef _KERNEL
+
+/* Only use the reduced hardware model */
+#define	ACPI_REDUCED_HARDWARE	1
+
+/* Section 5.2.10.1: global lock acquire/release functions */
+int	acpi_acquire_global_lock(volatile uint32_t *);
+int	acpi_release_global_lock(volatile uint32_t *);
+
+void	*acpi_map_table(vm_paddr_t pa, const char *sig);
+void	acpi_unmap_table(void *table);
+vm_paddr_t acpi_find_table(const char *sig);
+
+#endif /* _KERNEL */
+
+#endif /* __ACPICA_MACHDEP_H__ */