arch/powerpc/include/asm/current.h

   1 #ifndef _ASM_POWERPC_CURRENT_H
   2 #define _ASM_POWERPC_CURRENT_H
   3 #ifdef __KERNEL__
   4
   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 struct task_struct;
  13
  14 #ifdef __powerpc64__
  15 #include <linux/stddef.h>
  16 #include <asm/paca.h>
  17
  18 static inline struct task_struct *get_current(void)
  19 {
  20         struct task_struct *task;
  21
  22         __asm__ __volatile__("ld %0,%1(13)"
  23         : "=r" (task)
  24         : "i" (offsetof(struct paca_struct, __current)));
  25
  26         return task;
  27 }
  28 #define current get_current()
  29
  30 #else
  31
  32 /*
  33  * We keep `current' in r2 for speed.
  34  */
  35 register struct task_struct *current asm ("r2");
  36
  37 #endif
  38
  39 #endif /* __KERNEL__ */
  40 #endif /* _ASM_POWERPC_CURRENT_H */