1. In sysproc.c, define a function in which cps and chpr functions will be called.

//Add this in the end of the sysproc.c file

int
	sys_cps(void)
	{
	return cps();
	}
	int
	sys_chpr(void)
	{
	int pid, pr;
	if(argint(0, &pid) < 0)
	return -1;
	if(argint(1, &pr) < 0)
	return -1;
	return chpr(pid, pr);
	}

2. Make minor changes in the usys.S file. The .S extension indicates that this file has assembly level code and this file interacts with the hardware of the system.

//Add this in the end of the usys.S file

SYSCALL(cps)

SYSCALL(chpr)

Can someone help to solve it using ubuntu, please? My laptop is broken, please help me?