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Sourcecode: linux-2.6 version File versions

iwmmxt-notifier.c

/*
 *  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/config.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);

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