Add utility code to monitor host state
For SST (and possibly other PECI users), we need to know when CPU is not
available (to avoid using PECI), and when BIOS is booting (to avoid race
condition on configuring SST).
Subscribes to CurrentHostState to determine S5/S0 state, and also
CoreBiosDone to determine if BIOS is done.
Tested: as part of child change
Ie6eed8ab23bff289e01d6d125402a5509d3a9110
Signed-off-by: Jonathan Doman <jonathan.doman@intel.com>
Change-Id: I6a2ce21193d91a7efe53f7e48bcd57e685c903ff
diff --git a/include/cpuinfo_utils.hpp b/include/cpuinfo_utils.hpp
new file mode 100644
index 0000000..ab2ea92
--- /dev/null
+++ b/include/cpuinfo_utils.hpp
@@ -0,0 +1,50 @@
+// Copyright (c) 2021 Intel Corporation
+//
+// 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.
+
+#pragma once
+
+#include <boost/asio/io_context.hpp>
+#include <sdbusplus/asio/connection.hpp>
+
+#define DEBUG_PRINT \
+ if constexpr (false) \
+ std::cerr
+
+namespace cpu_info
+{
+
+/** Host states which are of interest just to cpuinfo use cases. */
+enum class HostState
+{
+ /** Host CPU is powered off. */
+ off,
+ /** Host CPU is powered on, but BIOS has not completed POST. */
+ postInProgress,
+ /** BIOS has completed POST. */
+ postComplete
+};
+
+/** Current host state - initialized to "off" */
+extern HostState hostState;
+
+/**
+ * Register D-Bus match handlers to keep hostState current. The D-Bus logic is
+ * entirely asynchronous, so hostState will never change from "off" until after
+ * this function is called and the asio event loop is running.
+ *
+ * @param[in] conn D-Bus ASIO connection.
+ */
+void hostStateSetup(const std::shared_ptr<sdbusplus::asio::connection>& conn);
+
+} // namespace cpu_info