boot/common/src/loader/cpu/m0/udivmodsi4.c

unsigned long udivmodsi4(unsigned long num, unsigned long den, int modwanted)
{
	unsigned long bits = 1;
	unsigned long ret = 0;
	unsigned long tmpnum = num;
	unsigned long tmpden = den;

	while (tmpden < tmpnum && bits && !(tmpden & (1L<<31)))
	{
		tmpden <<=1;
		bits <<=1;
	}
	while (bits)
	{
		if (tmpnum >= tmpden)
		{
			tmpnum -= tmpden;
			ret |= bits;
		}
		bits >>=1;
		tmpden >>=1;
	}
	if (modwanted) return tmpnum;
	
	return ret;
}