include/asm-sparc/current.h

   1 /* include/asm-sparc/current.h
   2  *
   3  * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   4  * Copyright (C) 2002 Pete Zaitcev (zaitcev@yahoo.com)
   5  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
   6  *
   7  *  Derived from "include/asm-s390/current.h" by
   8  *  Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  *  Derived from "include/asm-i386/current.h"
  10 */
  11 #ifndef _SPARC_CURRENT_H
  12 #define _SPARC_CURRENT_H
  13
  14 #include <linux/thread_info.h>
  15
  16 #ifdef CONFIG_SPARC64
  17 register struct task_struct *current asm("g4");
  18 #endif
  19
  20 #ifdef CONFIG_SPARC32
  21 /* We might want to consider using %g4 like sparc64 to shave a few cycles.
  22  *
  23  * Two stage process (inline + #define) for type-checking.
  24  * We also obfuscate get_current() to check if anyone used that by mistake.
  25  */
  26 struct task_struct;
  27 static inline struct task_struct *__get_current(void)
  28 {
  29         return current_thread_info()->task;
  30 }
  31 #define current __get_current()
  32 #endif
  33
  34 #endif /* !(_SPARC_CURRENT_H) */