include/asm-v850/current.h

   1 /*
   2  * include/asm-v850/current.h -- Current task
   3  *
   4  *  Copyright (C) 2001,02  NEC Corporation
   5  *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #ifndef __V850_CURRENT_H__
  15 #define __V850_CURRENT_H__
  16
  17 #ifndef __ASSEMBLY__ /* <linux/thread_info.h> is not asm-safe.  */
  18 #include <linux/thread_info.h>
  19 #endif
  20
  21 #include <asm/macrology.h>
  22
  23
  24 /* Register used to hold the current task pointer while in the kernel.
  25    Any `call clobbered' register without a special meaning should be OK,
  26    but check asm/v850/kernel/entry.S to be sure.  */
  27 #define CURRENT_TASK_REGNUM     16
  28 #define CURRENT_TASK            macrology_paste (r, CURRENT_TASK_REGNUM)
  29
  30
  31 #ifdef __ASSEMBLY__
  32
  33 /* Put a pointer to the current task structure into REG.  */
  34 #define GET_CURRENT_TASK(reg)                                           \
  35         GET_CURRENT_THREAD(reg);                                        \
  36         ld.w    TI_TASK[reg], reg
  37
  38 #else /* !__ASSEMBLY__ */
  39
  40 /* A pointer to the current task.  */
  41 register struct task_struct *current                                    \
  42    __asm__ (macrology_stringify (CURRENT_TASK));
  43
  44 #endif /* __ASSEMBLY__ */
  45
  46
  47 #endif /* _V850_CURRENT_H */