This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / arm / kernel / iwmmxt-notifier.c

diff --git a/arch/arm/kernel/iwmmxt-notifier.c b/arch/arm/kernel/iwmmxt-notifier.c
new file mode 100644 (file)
index 0000000..0d1a1db
--- /dev/null
+++ b/arch/arm/kernel/iwmmxt-notifier.c
@@ -0,0 +1,63 @@
+/*
+ *  linux/arch/arm/kernel/iwmmxt-notifier.c
+ *
+ *  XScale iWMMXt (Concan) context switching and handling
+ *
+ *  Initial code:
+ *  Copyright (c) 2003, Intel Corporation
+ *
+ *  Full lazy switching support, optimizations and more, by Nicolas Pitre
+ *  Copyright (c) 2003-2004, MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/thread_notify.h>
+#include <asm/io.h>
+
+static int iwmmxt_do(struct notifier_block *self, unsigned long cmd, void *t)
+{
+       struct thread_info *thread = t;
+
+       switch (cmd) {
+       case THREAD_NOTIFY_FLUSH:
+               /*
+                * flush_thread() zeroes thread->fpstate, so no need
+                * to do anything here.
+                *
+                * FALLTHROUGH: Ensure we don't try to overwrite our newly
+                * initialised state information on the first fault.
+                */
+
+       case THREAD_NOTIFY_RELEASE:
+               iwmmxt_task_release(thread);
+               break;
+
+       case THREAD_NOTIFY_SWITCH:
+               iwmmxt_task_switch(thread);
+               break;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block iwmmxt_notifier_block = {
+       .notifier_call  = iwmmxt_do,
+};
+
+static int __init iwmmxt_init(void)
+{
+       thread_register_notifier(&iwmmxt_notifier_block);
+
+       return 0;
+}
+
+late_initcall(iwmmxt_init);