1. 根目录:
2. arch
3. score
4. include
5. asm
6. switch_to.h

#ifndef _ASM_SCORE_SWITCH_TO_H
#define _ASM_SCORE_SWITCH_TO_H

extern void *resume(void *last, void *next, void *next_ti);

#define switch_to(prev, next, last)				\
do {								\
	(last) = resume(prev, next, task_thread_info(next));	\
} while (0)

#endif /* _ASM_SCORE_SWITCH_TO_H */