LXR linux/arch/unicore32/include/asm/switch

   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
  13struct task_struct;
  14struct 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 */
  21extern 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