1. 根目录:
2. arch
3. powerpc
4. include
5. uapi
6. asm
7. ioctl.h

#ifndef _ASM_POWERPC_IOCTL_H
#define _ASM_POWERPC_IOCTL_H

#define _IOC_SIZEBITS	13
#define _IOC_DIRBITS	3

#define _IOC_NONE	1U
#define _IOC_READ	2U
#define _IOC_WRITE	4U

#include <asm-generic/ioctl.h>

#endif	/* _ASM_POWERPC_IOCTL_H */