1. 根目录:
2. arch
3. x86
4. include
5. uapi
6. asm
7. vsyscall.h

#ifndef _UAPI_ASM_X86_VSYSCALL_H
#define _UAPI_ASM_X86_VSYSCALL_H

enum vsyscall_num {
	__NR_vgettimeofday,
	__NR_vtime,
	__NR_vgetcpu,
};

#define VSYSCALL_ADDR (-10UL << 20)

#endif /* _UAPI_ASM_X86_VSYSCALL_H */