+static void
+scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr
+ , struct cursorpos ul, struct cursorpos lr)
+{
+ int cheight = 8;
+ int cwidth = 8;
+ int stride = GET_BDA(video_cols) * cwidth;
+ void *src_far, *dest_far;
+ if (nblines >= 0) {
+ dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
+ src_far = dest_far + nblines * cheight * stride;
+ } else {
+ // Scroll down
+ nblines = -nblines;
+ dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
+ src_far = dest_far - nblines * cheight * stride;
+ stride = -stride;
+ }
+ int cols = lr.x - ul.x + 1;
+ int rows = lr.y - ul.y + 1;
+ if (nblines < rows)
+ dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
+ , stride, (rows - nblines) * cheight);
+ if (attr < 0)
+ attr = 0;
+ memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
+ , stride, nblines * cheight);
+}
+