1 files changed, 70 insertions, 0 deletions
diff --git a/cpukit/rtems/src/schedulermapfromposix.c b/cpukit/rtems/src/schedulermapfromposix.c
new file mode 100644
index 0000000000..fca9de2f11
--- /dev/null
+++ b/cpukit/rtems/src/schedulermapfromposix.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup ClassicTasks
+ *
+ * @brief Implementation of rtems_scheduler_map_priority_from_posix().
+ */
+
+/*
+ * Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/rtems/tasks.h>
+#include <rtems/score/schedulerimpl.h>
+
+rtems_status_code rtems_scheduler_map_priority_from_posix(
+  rtems_id             scheduler_id,
+  int                  posix_priority,
+  rtems_task_priority *priority
+)
+{
+  const Scheduler_Control *scheduler;
+
+  if ( priority == NULL ) {
+    return RTEMS_INVALID_ADDRESS;
+  }
+
+  scheduler = _Scheduler_Get_by_id( scheduler_id );
+  if ( scheduler == NULL ) {
+    return RTEMS_INVALID_ID;
+  }
+
+  if ( posix_priority < 1 ) {
+    return RTEMS_INVALID_PRIORITY;
+  }
+
+  if ( posix_priority >= scheduler->maximum_priority ) {
+    return RTEMS_INVALID_PRIORITY;
+  }
+
+  *priority = scheduler->maximum_priority - (Priority_Control) posix_priority;
+  return RTEMS_SUCCESSFUL;
+}