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146 screen_up(struct ite_softc *ip, int top, int bottom, int lines)
153 	if (top >= bottom)
156 	if (top + lines >= bottom)
158 	    retina_clear (ip, top, 0, bottom - top, ip->cols);
185 		/* write to line TOP */
186 		long toploc = top * (md->TX / 16);
191 		/* read from line TOP + LINES */
192 		long fromloc = (top+lines) * (md->TX / 16);
199 		short x = (1 + bottom - (top + lines)) * (md->TX / 16) - 1;
274 screen_down(struct ite_softc *ip, int top, int bottom, int lines)
281 	if (top >= bottom)
284 	if (top + lines >= bottom)
286 	    retina_clear (ip, top, 0, bottom - top, ip->cols);
303 		/* write to line TOP + LINES */
304 		long toloc = (top + lines) * (md->TX / 16);
309 		/* read from line TOP */
310 		long fromloc = top * (md->TX / 16);
317 		short x = (1 + bottom - (top + lines)) * (md->TX / 16) - 1;
318 		p += (1 + bottom - (top + lines)) * md->TX;
358 		f += top * md->TX * 2;
373 		p += top * (md->TX/4);