Resume on Reboot default implementation

A default implementation of the RebootEscrow HAL which relies on RAM
retention to keep a key around during a reboot to apply an OTA. This
should work on devices that use a "warm reboot" and most likely will
work on devices that use a "cold reboot" as well.

DRAM will retain information for several seconds depending on the
temperature and other factors. This is enough to survive a reboot. With
the Hadamard code used in this change for error recovery, many errors
can be recovered.

Bug: 63928581
Test: make
Test: atest VtsHalRebootEscrowTargetTest
Change-Id: Ib8db7888d64fee8d827d7c06892b9a1f2af87add

1 files changed, 35 insertions, 0 deletions

diff --git a/rebootescrow/aidl/default/service.cpp b/rebootescrow/aidl/default/service.cpp
new file mode 100644
index 0000000000..bd2378e513
--- /dev/null
+++ b/rebootescrow/aidl/default/service.cpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.1 (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-2.1
+ *
+ * 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 "rebootescrow-impl/RebootEscrow.h"
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using aidl::android::hardware::rebootescrow::RebootEscrow;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+
+    auto re = ndk::SharedRefBase::make<RebootEscrow>();
+    const std::string instance = std::string() + RebootEscrow::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(re->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;
+}