1 files changed, 74 insertions, 0 deletions

diff --git a/firmware/kernel/tick.c b/firmware/kernel/tick.c
new file mode 100644
index 0000000000..c524560687
--- /dev/null
+++ b/firmware/kernel/tick.c
@@ -0,0 +1,74 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "tick.h"
+#include "general.h"
+#include "panic.h"
+
+/****************************************************************************
+ * Timer tick
+ *****************************************************************************/
+
+
+/* List of tick tasks - final element always NULL for termination */
+void (*tick_funcs[MAX_NUM_TICK_TASKS+1])(void);
+
+#if !defined(CPU_PP) || !defined(BOOTLOADER) || \
+    defined(HAVE_BOOTLOADER_USB_MODE)
+volatile long current_tick SHAREDDATA_ATTR = 0;
+#endif
+
+/* - Timer initialization and interrupt handler is defined at
+ * the target level: tick_start() is implemented in the target tree */
+
+int tick_add_task(void (*f)(void))
+{
+    int oldlevel = disable_irq_save();
+    void **arr = (void **)tick_funcs;
+    void **p = find_array_ptr(arr, f);
+
+    /* Add a task if there is room */
+    if(p - arr < MAX_NUM_TICK_TASKS)
+    {
+        *p = f; /* If already in list, no problem. */
+    }
+    else
+    {
+        panicf("Error! tick_add_task(): out of tasks");
+    }
+
+    restore_irq(oldlevel);
+    return 0;
+}
+
+int tick_remove_task(void (*f)(void))
+{
+    int oldlevel = disable_irq_save();
+    int rc = remove_array_ptr((void **)tick_funcs, f);
+    restore_irq(oldlevel);
+    return rc;
+}
+
+void init_tick(void)
+{
+    tick_start(1000/HZ);
+}