void scrollfront(struct vc_data *vc, int lines)
{
	if (!lines)
		lines = vc->vc_rows / 2;
	scrolldelta(lines);
}
void scrollfront(struct vc_data *vc, int lines)
{
	if (!lines)
		lines = vc->vc_rows / 2;
	scrolldelta(lines);
}