+int stdvga_get_window(struct vgamode_s *vmode_g, int window);
+int stdvga_set_window(struct vgamode_s *vmode_g, int window, int val);
+int stdvga_get_linelength(struct vgamode_s *vmode_g);
+int stdvga_set_linelength(struct vgamode_s *vmode_g, int val);
+int stdvga_get_displaystart(struct vgamode_s *vmode_g);
+int stdvga_set_displaystart(struct vgamode_s *vmode_g, int val);