kernel: Break out kernel primitives into separate files and move to separate dir.

No code changed, just shuffling stuff around. This should make it easier to
build only select parts kernel and use different implementations.

Change-Id: Ie1f00f93008833ce38419d760afd70062c5e22b5

firmware/kernel/include/semaphore.h

@@ -0,0 +1,40 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Björn Stenberg
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef SEMAPHORE_H
+#define SEMAPHORE_H
+
+#include "config.h"
+#include "thread.h"
+
+struct semaphore
+{
+    struct thread_entry *queue;         /* Waiter list */
+    int volatile count;                 /* # of waits remaining before unsignaled */
+    int max;                            /* maximum # of waits to remain signaled */
+    IF_COP( struct corelock cl; )       /* multiprocessor sync */
+};
+
+extern void semaphore_init(struct semaphore *s, int max, int start);
+extern int  semaphore_wait(struct semaphore *s, int timeout);
+extern void semaphore_release(struct semaphore *s);
+
+#endif /* SEMAPHORE_H */