64 lines
1.4 KiB
C
64 lines
1.4 KiB
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/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);
|