35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* FR-V CPU basic task switching
|
|
*
|
|
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _ASM_SWITCH_TO_H
|
|
#define _ASM_SWITCH_TO_H
|
|
|
|
#include <linux/thread_info.h>
|
|
|
|
/*
|
|
* switch_to(prev, next) should switch from task `prev' to `next'
|
|
* `prev' will never be the same as `next'.
|
|
* The `mb' is to tell GCC not to cache `current' across this call.
|
|
*/
|
|
extern asmlinkage
|
|
struct task_struct *__switch_to(struct thread_struct *prev_thread,
|
|
struct thread_struct *next_thread,
|
|
struct task_struct *prev);
|
|
|
|
#define switch_to(prev, next, last) \
|
|
do { \
|
|
(prev)->thread.sched_lr = \
|
|
(unsigned long) __builtin_return_address(0); \
|
|
(last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
|
|
mb(); \
|
|
} while(0)
|
|
|
|
#endif /* _ASM_SWITCH_TO_H */
|