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 */ 22 extern asmlinkage 23 struct 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) \ 28 do { \ 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