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diff --git a/sys/arm64/include/msan.h b/sys/arm64/include/msan.h
new file mode 100644
--- /dev/null
+++ b/sys/arm64/include/msan.h
@@ -0,0 +1,91 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 The FreeBSD Foundation
+ * Copyright (c) 2023 Juniper Networks, Inc.
+ *
+ * This software was developed by Mark Johnston under sponsorship from 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.
+ */
+
+#ifndef _MACHINE_MSAN_H_
+#define _MACHINE_MSAN_H_
+
+#ifdef KMSAN
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_page.h>
+#include <machine/vmparam.h>
+
+typedef uint32_t msan_orig_t;
+
+/*
+ * Our 32-bit origin cells encode a 2-bit type and 30-bit pointer to a kernel
+ * instruction. The pointer is compressed by making it a positive offset
+ * relative to KERNBASE.
+ */
+#define KMSAN_ORIG_TYPE_SHIFT 30u
+#define KMSAN_ORIG_PTR_MASK ((1ul << KMSAN_ORIG_TYPE_SHIFT) - 1)
+
+static inline msan_orig_t
+kmsan_md_orig_encode(int type, uintptr_t ptr)
+{
+ return ((type << KMSAN_ORIG_TYPE_SHIFT) |
+ ((ptr & KMSAN_ORIG_PTR_MASK)));
+}
+
+static inline void
+kmsan_md_orig_decode(msan_orig_t orig, int *type, uintptr_t *ptr)
+{
+ *type = orig >> KMSAN_ORIG_TYPE_SHIFT;
+ *ptr = (orig & KMSAN_ORIG_PTR_MASK) | KERNBASE;
+}
+
+static inline vm_offset_t
+kmsan_md_addr_to_shad(vm_offset_t addr)
+{
+ return (addr - VM_MIN_KERNEL_ADDRESS + KMSAN_SHAD_MIN_ADDRESS);
+}
+
+static inline vm_offset_t
+kmsan_md_addr_to_orig(vm_offset_t addr)
+{
+ return (addr - VM_MIN_KERNEL_ADDRESS + KMSAN_ORIG_MIN_ADDRESS);
+}
+
+static inline bool
+kmsan_md_unsupported(vm_offset_t addr)
+{
+ /*
+ * It would be cheaper to use VM_MAX_KERNEL_ADDRESS as the upper bound,
+ * but we need to exclude device mappings above kernel_vm_end but within
+ * the kernel map.
+ */
+ return (addr < VM_MIN_KERNEL_ADDRESS || addr >= kernel_vm_end);
+}
+
+#endif /* KMSAN */
+
+#endif /* !_MACHINE_MSAN_H_ */

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