1/* FR-V CPU basic task switching
2 *
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _ASM_SWITCH_TO_H
13#define _ASM_SWITCH_TO_H
14
15#include <linux/thread_info.h>
16
17/*
18 * switch_to(prev, next) should switch from task `prev' to `next'
19 * `prev' will never be the same as `next'.
20 * The `mb' is to tell GCC not to cache `current' across this call.
21 */
22extern asmlinkage
23struct task_struct *__switch_to(struct thread_struct *prev_thread,
24				struct thread_struct *next_thread,
25				struct task_struct *prev);
26
27#define switch_to(prev, next, last)					\
28do {									\
29	(prev)->thread.sched_lr =					\
30		(unsigned long) __builtin_return_address(0);		\
31	(last) = __switch_to(&(prev)->thread, &(next)->thread, (prev));	\
32	mb();								\
33} while(0)
34
35#endif /* _ASM_SWITCH_TO_H */
36