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diff --git a/vm/Atomic.h b/vm/Atomic.h
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Atomic operations
+ */
+#ifndef DALVIK_ATOMIC_H_
+#define DALVIK_ATOMIC_H_
+
+#include <cutils/atomic.h>          /* use common Android atomic ops */
+#include <cutils/atomic-inline.h>   /* and some uncommon ones */
+
+/*
+ * NOTE: Two "quasiatomic" operations on the exact same memory address
+ * are guaranteed to operate atomically with respect to each other,
+ * but no guarantees are made about quasiatomic operations mixed with
+ * non-quasiatomic operations on the same address, nor about
+ * quasiatomic operations that are performed on partially-overlapping
+ * memory.
+ *
+ * Only the "Sync" versions of these provide a memory barrier.
+ */
+
+/*
+ * Swap the 64-bit value at "addr" with "value".  Returns the previous
+ * value.
+ */
+extern "C" int64_t dvmQuasiAtomicSwap64(int64_t value, volatile int64_t* addr);
+
+/*
+ * Swap the 64-bit value at "addr" with "value".  Returns the previous
+ * value.  Provides memory barriers.
+ */
+extern "C" int64_t dvmQuasiAtomicSwap64Sync(int64_t value,
+                                            volatile int64_t* addr);
+
+/*
+ * Read the 64-bit value at "addr".
+ */
+extern "C" int64_t dvmQuasiAtomicRead64(volatile const int64_t* addr);
+
+/*
+ * If the value at "addr" is equal to "oldvalue", replace it with "newvalue"
+ * and return 0.  Otherwise, don't swap, and return nonzero.
+ */
+int dvmQuasiAtomicCas64(int64_t oldvalue, int64_t newvalue,
+        volatile int64_t* addr);
+
+#endif  // DALVIK_ATOMIC_H_