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-rw-r--r--firmware/kernel/tick.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/firmware/kernel/tick.c b/firmware/kernel/tick.c
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--- /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);
+}