1 files changed, 67 insertions, 0 deletions

diff --git a/firmware/kernel/include/tick.h b/firmware/kernel/include/tick.h
new file mode 100644
index 0000000000..9810f4a1e5
--- /dev/null
+++ b/firmware/kernel/include/tick.h
@@ -0,0 +1,67 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 TICK_H
+#define TICK_H
+
+#include "config.h"
+#include "system.h" /* for NULL */
+extern void init_tick(void);
+
+#define HZ      100 /* number of ticks per second */
+
+#define MAX_NUM_TICK_TASKS 8
+
+/* global tick variable */
+#if defined(CPU_PP) && defined(BOOTLOADER) && \
+    !defined(HAVE_BOOTLOADER_USB_MODE)
+/* We don't enable interrupts in the PP bootloader unless USB mode is
+   enabled for it, so we need to fake the current_tick variable */
+#define current_tick (signed)(USEC_TIMER/10000)
+
+static inline void call_tick_tasks(void)
+{
+}
+#else
+extern volatile long current_tick;
+
+/* inline helper for implementing target interrupt handler */
+static inline void call_tick_tasks(void)
+{
+    extern void (*tick_funcs[MAX_NUM_TICK_TASKS+1])(void);
+    void (**p)(void) = tick_funcs;
+    void (*fn)(void);
+
+    current_tick++;
+
+    for(fn = *p; fn != NULL; fn = *(++p))
+    {
+        fn();
+    }
+}
+#endif
+
+/* implemented in target tree */
+extern void tick_start(unsigned int interval_in_ms) INIT_ATTR;
+
+extern int tick_add_task(void (*f)(void));
+extern int tick_remove_task(void (*f)(void));
+
+#endif /* TICK_H */