ipmi: split library constructor

Split out the library constuctor so that the code can be built into
separate library modules.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I70ac51aaea200d4634f9220a642b0e2bef6748bd
diff --git a/ipmi/main_ipmi.cpp b/ipmi/main_ipmi.cpp
new file mode 100644
index 0000000..6056464
--- /dev/null
+++ b/ipmi/main_ipmi.cpp
@@ -0,0 +1,38 @@
+/**
+ * Copyright 2017 Google Inc.
+ *
+ * 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 "manualcmds.hpp"
+
+#include <ipmid/iana.hpp>
+#include <ipmid/oemopenbmc.hpp>
+#include <ipmid/oemrouter.hpp>
+
+#include <cstdio>
+
+void setupGlobalOemFanControl() __attribute__((constructor));
+
+void setupGlobalOemFanControl()
+{
+    oem::Router* router = oem::mutableRouter();
+
+    std::fprintf(
+        stderr,
+        "Registering OEM:[%#08X], Cmd:[%#04X] for Manual Zone Control\n",
+        oem::obmcOemNumber, oem::Cmd::fanManualCmd);
+
+    router->registerHandler(oem::obmcOemNumber, oem::Cmd::fanManualCmd,
+                            pid_control::ipmi::manualModeControl);
+}