kernel/arch/c6x/include/asm/switch_to.h

   1 /*
   2  *  Port on Texas Instruments TMS320C6x architecture
   3  *
   4  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  */
  11 #ifndef _ASM_C6X_SWITCH_TO_H
  12 #define _ASM_C6X_SWITCH_TO_H
  13
  14 #include <linux/linkage.h>
  15
  16 #define prepare_to_switch()    do { } while (0)
  17
  18 struct task_struct;
  19 struct thread_struct;
  20 asmlinkage void *__switch_to(struct thread_struct *prev,
  21                              struct thread_struct *next,
  22                              struct task_struct *tsk);
  23
  24 #define switch_to(prev, next, last)                             \
  25         do {                                                    \
  26                 current->thread.wchan = (u_long) __builtin_return_address(0); \
  27                 (last) = __switch_to(&(prev)->thread,           \
  28                                      &(next)->thread, (prev));  \
  29                 mb();                                           \
  30                 current->thread.wchan = 0;                      \
  31         } while (0)
  32
  33 #endif /* _ASM_C6X_SWITCH_TO_H */