arch/unicore32/include/asm/switch_to.h

   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__ */