diff --git a/libs/utils/Binder.cpp b/libs/utils/Binder.cpp
new file mode 100644
index 0000000..37e4685
--- /dev/null
+++ b/libs/utils/Binder.cpp
@@ -0,0 +1,242 @@
+/*
+ * Copyright (C) 2005 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.
+ */
+
+#include <utils/Binder.h>
+
+#include <utils/Atomic.h>
+#include <utils/BpBinder.h>
+#include <utils/IInterface.h>
+#include <utils/Parcel.h>
+
+#include <stdio.h>
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+sp<IInterface>  IBinder::queryLocalInterface(const String16& descriptor)
+{
+    return NULL;
+}
+
+BBinder* IBinder::localBinder()
+{
+    return NULL;
+}
+
+BpBinder* IBinder::remoteBinder()
+{
+    return NULL;
+}
+
+bool IBinder::checkSubclass(const void* /*subclassID*/) const
+{
+    return false;
+}
+
+// ---------------------------------------------------------------------------
+
+class BBinder::Extras
+{
+public:
+    Mutex mLock;
+    BpBinder::ObjectManager mObjects;
+};
+
+// ---------------------------------------------------------------------------
+
+BBinder::BBinder()
+    : mExtras(NULL)
+{
+}
+
+bool BBinder::isBinderAlive() const
+{
+    return true;
+}
+
+status_t BBinder::pingBinder()
+{
+    return NO_ERROR;
+}
+
+String16 BBinder::getInterfaceDescriptor() const
+{
+    LOGW("reached BBinder::getInterfaceDescriptor (this=%p)", this);
+    return String16();
+}
+
+status_t BBinder::transact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    data.setDataPosition(0);
+
+    status_t err = NO_ERROR;
+    switch (code) {
+        case PING_TRANSACTION:
+            reply->writeInt32(pingBinder());
+            break;
+        default:
+            err = onTransact(code, data, reply, flags);
+            break;
+    }
+
+    if (reply != NULL) {
+        reply->setDataPosition(0);
+    }
+
+    return err;
+}
+
+status_t BBinder::linkToDeath(
+    const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags)
+{
+    return INVALID_OPERATION;
+}
+
+status_t BBinder::unlinkToDeath(
+    const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags,
+    wp<DeathRecipient>* outRecipient)
+{
+    return INVALID_OPERATION;
+}
+
+status_t BBinder::dump(int fd, const Vector<String16>& args)
+{
+    return NO_ERROR;
+}
+
+void BBinder::attachObject(
+    const void* objectID, void* object, void* cleanupCookie,
+    object_cleanup_func func)
+{
+    Extras* e = mExtras;
+
+    if (!e) {
+        e = new Extras;
+        if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e),
+                reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) {
+            delete e;
+            e = mExtras;
+        }
+        if (e == 0) return; // out of memory
+    }
+
+    AutoMutex _l(e->mLock);
+    e->mObjects.attach(objectID, object, cleanupCookie, func);
+}
+
+void* BBinder::findObject(const void* objectID) const
+{
+    Extras* e = mExtras;
+    if (!e) return NULL;
+
+    AutoMutex _l(e->mLock);
+    return e->mObjects.find(objectID);
+}
+
+void BBinder::detachObject(const void* objectID)
+{
+    Extras* e = mExtras;
+    if (!e) return;
+
+    AutoMutex _l(e->mLock);
+    e->mObjects.detach(objectID);
+}
+
+BBinder* BBinder::localBinder()
+{
+    return this;
+}
+
+BBinder::~BBinder()
+{
+    if (mExtras) delete mExtras;
+}
+
+
+status_t BBinder::onTransact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    switch (code) {
+        case INTERFACE_TRANSACTION:
+            reply->writeString16(getInterfaceDescriptor());
+            return NO_ERROR;
+
+        case DUMP_TRANSACTION: {
+            int fd = data.readFileDescriptor();
+            int argc = data.readInt32();
+            Vector<String16> args;
+            for (int i = 0; i < argc && data.dataAvail() > 0; i++) {
+               args.add(data.readString16());
+            }
+            return dump(fd, args);
+        }
+        default:
+            return UNKNOWN_TRANSACTION;
+    }
+}
+
+// ---------------------------------------------------------------------------
+
+enum {
+    // This is used to transfer ownership of the remote binder from
+    // the BpRefBase object holding it (when it is constructed), to the
+    // owner of the BpRefBase object when it first acquires that BpRefBase.
+    kRemoteAcquired = 0x00000001
+};
+
+BpRefBase::BpRefBase(const sp<IBinder>& o)
+    : mRemote(o.get()), mRefs(NULL), mState(0)
+{
+    extendObjectLifetime(OBJECT_LIFETIME_WEAK);
+
+    if (mRemote) {
+        mRemote->incStrong(this);           // Removed on first IncStrong().
+        mRefs = mRemote->createWeak(this);  // Held for our entire lifetime.
+    }
+}
+
+BpRefBase::~BpRefBase()
+{
+    if (mRemote) {
+        if (!(mState&kRemoteAcquired)) {
+            mRemote->decStrong(this);
+        }
+        mRefs->decWeak(this);
+    }
+}
+
+void BpRefBase::onFirstRef()
+{
+    android_atomic_or(kRemoteAcquired, &mState);
+}
+
+void BpRefBase::onLastStrongRef(const void* id)
+{
+    if (mRemote) {
+        mRemote->decStrong(this);
+    }
+}
+
+bool BpRefBase::onIncStrongAttempted(uint32_t flags, const void* id)
+{
+    return mRemote ? mRefs->attemptIncStrong(this) : false;
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android