1 files changed, 51 insertions, 0 deletions
diff --git a/src/kernel/doorbell.C b/src/kernel/doorbell.C
new file mode 100644
index 000000000..33b782bf7
--- /dev/null
+++ b/src/kernel/doorbell.C
@@ -0,0 +1,51 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/kernel/doorbell.C $                                       */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2015,2016                        */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* 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.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+#include <stdint.h>
+#include <arch/ppc.H>
+#include <kernel/cpumgr.H>
+
+void doorbell_clear()
+{
+    register uint64_t msgtype = 0x0000000028000000; /// Comes from the ISA.
+    asm volatile("msgclr %0" :: "r" (msgtype));
+
+    return;
+}
+
+void doorbell_broadcast()
+{
+    size_t threadCount = CpuManager::getThreadCount();
+
+    uint64_t msgtype = 0x0000000028000000;  /// Comes from the ISA.
+    uint64_t thread = getPIR() & (threadCount - 1);
+    for (size_t i = 0; i < threadCount; ++i)
+    {
+        if (i != thread)
+        {
+            register uint64_t msg = msgtype | i;
+            asm volatile("msgsnd %0" :: "r" (msg));
+        }
+    }
+}