arch/csky/include/asm/switch_to.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4 #ifndef __ASM_CSKY_SWITCH_TO_H
   5 #define __ASM_CSKY_SWITCH_TO_H
   6
   7 #include <linux/thread_info.h>
   8 #ifdef CONFIG_CPU_HAS_FPU
   9 #include <abi/fpu.h>
  10 static inline void __switch_to_fpu(struct task_struct *prev,
  11                                    struct task_struct *next)
  12 {
  13         save_to_user_fp(&prev->thread.user_fp);
  14         restore_from_user_fp(&next->thread.user_fp);
  15 }
  16 #else
  17 static inline void __switch_to_fpu(struct task_struct *prev,
  18                                    struct task_struct *next)
  19 {}
  20 #endif
  21
  22 /*
  23  * Context switching is now performed out-of-line in switch_to.S
  24  */
  25 extern struct task_struct *__switch_to(struct task_struct *,
  26                                        struct task_struct *);
  27
  28 #define switch_to(prev, next, last)                                     \
  29         do {                                                            \
  30                 struct task_struct *__prev = (prev);                    \
  31                 struct task_struct *__next = (next);                    \
  32                 __switch_to_fpu(__prev, __next);                        \
  33                 ((last) = __switch_to((prev), (next)));                 \
  34         } while (0)
  35
  36 #endif /* __ASM_CSKY_SWITCH_TO_H */