release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mn10300/include/asm/current.h

   1 /* MN10300 Current task structure accessor
   2  *
   3  * Copyright (C) 2007 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 Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #ifndef _ASM_CURRENT_H
  12 #define _ASM_CURRENT_H
  13
  14 #include <linux/thread_info.h>
  15
  16 /*
  17  * dedicate E2 to keeping the current task pointer
  18  */
  19 #ifdef CONFIG_MN10300_CURRENT_IN_E2
  20
  21 register struct task_struct *const current asm("e2") __attribute__((used));
  22
  23 #define get_current() current
  24
  25 extern struct task_struct *__current;
  26
  27 #else
  28 static inline __attribute__((const))
  29 struct task_struct *get_current(void)
  30 {
  31         return current_thread_info()->task;
  32 }
  33
  34 #define current get_current()
  35 #endif
  36
  37 #endif /* _ASM_CURRENT_H */