arch/arc/include/asm/switch_to.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef _ASM_ARC_SWITCH_TO_H
  10 #define _ASM_ARC_SWITCH_TO_H
  11
  12 #ifndef __ASSEMBLY__
  13
  14 #include <linux/sched.h>
  15
  16 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE
  17
  18 extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
  19 #define ARC_FPU_PREV(p, n)      fpu_save_restore(p, n)
  20 #define ARC_FPU_NEXT(t)
  21
  22 #else
  23
  24 #define ARC_FPU_PREV(p, n)
  25 #define ARC_FPU_NEXT(n)
  26
  27 #endif /* !CONFIG_ARC_FPU_SAVE_RESTORE */
  28
  29 #ifdef CONFIG_ARC_PLAT_EZNPS
  30 extern void dp_save_restore(struct task_struct *p, struct task_struct *n);
  31 #define ARC_EZNPS_DP_PREV(p, n)      dp_save_restore(p, n)
  32 #else
  33 #define ARC_EZNPS_DP_PREV(p, n)
  34
  35 #endif /* !CONFIG_ARC_PLAT_EZNPS */
  36
  37 struct task_struct *__switch_to(struct task_struct *p, struct task_struct *n);
  38
  39 #define switch_to(prev, next, last)     \
  40 do {                                    \
  41         ARC_EZNPS_DP_PREV(prev, next);  \
  42         ARC_FPU_PREV(prev, next);       \
  43         last = __switch_to(prev, next);\
  44         ARC_FPU_NEXT(next);             \
  45         mb();                           \
  46 } while (0)
  47
  48 #endif
  49
  50 #endif