LXR linux/arch/frv/include/asm/switch

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