Index: sys/arm64/arm64/pci_cfgreg.c
===================================================================
--- /dev/null
+++ sys/arm64/arm64/pci_cfgreg.c
@@ -0,0 +1,73 @@
+/*-
+ * Copyright (c) 2015 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Semihalf under
+ * the sponsorship of the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+
+#include <machine/pci_cfgreg.h>
+
+/*
+ * This file contains stubs for ACPI PCI functions
+ */
+
+/*
+ * Read configuration space register
+ */
+uint32_t
+pci_cfgregread(int bus, int slot, int func, int reg, int bytes)
+{
+
+	panic("pci_cfgregread not implemented");
+	return (0);
+}
+
+/*
+ * Write configuration space register
+ */
+void
+pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data, int bytes)
+{
+
+	panic("pci_cfgregwrite not implemented");
+}
+
+/*
+ * Initialize access to configuration space
+ */
+int
+pci_cfgregopen(void)
+{
+
+	panic("pci_cfgregopen not implemented");
+	return (0);
+}
Index: sys/arm64/include/pci_cfgreg.h
===================================================================
--- sys/arm64/include/pci_cfgreg.h
+++ sys/arm64/include/pci_cfgreg.h
@@ -1 +1,11 @@
 /* $FreeBSD$ */
+
+#ifndef __PCI_CFGREG_H
+#define __PCI_CFGREG_H
+
+int pci_cfgregopen(void);
+uint32_t pci_cfgregread(int bus, int slot, int func, int reg, int bytes);
+void pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data,
+    int bytes);
+
+#endif
Index: sys/conf/files.arm64
===================================================================
--- sys/conf/files.arm64
+++ sys/conf/files.arm64
@@ -36,6 +36,7 @@
 arm64/arm64/mem.c		standard
 arm64/arm64/minidump_machdep.c	standard
 arm64/arm64/nexus.c		standard
+arm64/arm64/pci_cfgreg.c	optional	pci
 arm64/arm64/pic_if.m		standard
 arm64/arm64/pmap.c		standard
 arm64/arm64/stack_machdep.c	standard