x86_64-buildroot-linux-gnu/sysroot/usr/include/asm/vsyscall.h

#ifndef _ASM_X86_VSYSCALL_H
#define _ASM_X86_VSYSCALL_H

enum vsyscall_num {
	__NR_vgettimeofday,
	__NR_vtime,
	__NR_vgetcpu,
};

#define VSYSCALL_ADDR (-10UL << 20)

#endif /* _ASM_X86_VSYSCALL_H */