1 /* 2 * Task switching for PKUnity SoC and UniCore ISA 3 * 4 * Copyright (C) 2001-2012 GUAN Xue-tao 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #ifndef __UNICORE_SWITCH_TO_H__ 11 #define __UNICORE_SWITCH_TO_H__ 12 13 struct task_struct; 14 struct thread_info; 15 16 /* 17 * switch_to(prev, next) should switch from task `prev' to `next' 18 * `prev' will never be the same as `next'. schedule() itself 19 * contains the memory barrier to tell GCC not to cache `current'. 20 */ 21 extern struct task_struct *__switch_to(struct task_struct *, 22 struct thread_info *, struct thread_info *); 23 24 #define switch_to(prev, next, last) \ 25 do { \ 26 last = __switch_to(prev, task_thread_info(prev), \ 27 task_thread_info(next)); \ 28 } while (0) 29 30 #endif /* __UNICORE_SWITCH_TO_H__ */ 31