fbcon.c

h内核

			if (c == scr_readw(d)) {
				if (s > start) {
					fbcon_putcs(vc, start, s - start,
						     line, x);
					x += s - start + 1;
					start = s + 1;
				} else {
					x++;
					start++;
				}
			}
			scr_writew(c, d);
			console_conditional_schedule();
			s++;
			d++;
		} while (s < le);
		if (s > start)
			fbcon_putcs(vc, start, s - start, line, x);
		console_conditional_schedule();
		if (offset > 0)
			line++;
		else {
			line--;
			/* NOTE: We subtract two lines from these pointers */
			s -= vc->vc_size_row;
			d -= vc->vc_size_row;
		}
	}
}

static inline void fbcon_softback_note(struct vc_data *vc, int t,
				       int count)
{
	unsigned short *p;

	if (vc->vc_num != fg_console)
		return;
	p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);

	while (count) {
		scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
		count--;
		p = advance_row(p, 1);
		softback_in += vc->vc_size_row;
		if (softback_in == softback_end)
			softback_in = softback_buf;
		if (softback_in == softback_top) {
			softback_top += vc->vc_size_row;
			if (softback_top == softback_end)
				softback_top = softback_buf;
		}
	}
	softback_curr = softback_in;
}

static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
			int count)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct display *p = &fb_display[vc->vc_num];
	struct fbcon_ops *ops = info->fbcon_par;
	int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;

	if (fbcon_is_inactive(vc, info))
		return -EINVAL;

	fbcon_cursor(vc, CM_ERASE);

	/*
	 * ++Geert: Only use ywrap/ypan if the console is in text mode
	 * ++Andrew: Only use ypan on hardware text mode when scrolling the
	 *           whole screen (prevents flicker).
	 */

	switch (dir) {
	case SM_UP:
		if (count > vc->vc_rows)	/* Maximum realistic size */
			count = vc->vc_rows;
		if (softback_top)
			fbcon_softback_note(vc, t, count);
		if (logo_shown >= 0)
			goto redraw_up;
		switch (p->scrollmode) {
		case SCROLL_MOVE:
			ops->bmove(vc, info, t + count, 0, t, 0,
				    b - t - count, vc->vc_cols);
			ops->clear(vc, info, b - count, 0, count,
				  vc->vc_cols);
			break;

		case SCROLL_WRAP_MOVE:
			if (b - t - count > 3 * vc->vc_rows >> 2) {
				if (t > 0)
					fbcon_bmove(vc, 0, 0, count, 0, t,
						    vc->vc_cols);
				ywrap_up(vc, count);
				if (vc->vc_rows - b > 0)
					fbcon_bmove(vc, b - count, 0, b, 0,
						    vc->vc_rows - b,
						    vc->vc_cols);
			} else if (info->flags & FBINFO_READS_FAST)
				fbcon_bmove(vc, t + count, 0, t, 0,
					    b - t - count, vc->vc_cols);
			else
				goto redraw_up;
			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
			break;

		case SCROLL_PAN_REDRAW:
			if ((p->yscroll + count <=
			     2 * (p->vrows - vc->vc_rows))
			    && ((!scroll_partial && (b - t == vc->vc_rows))
				|| (scroll_partial
				    && (b - t - count >
					3 * vc->vc_rows >> 2)))) {
				if (t > 0)
					fbcon_redraw_move(vc, p, 0, t, count);
				ypan_up_redraw(vc, t, count);
				if (vc->vc_rows - b > 0)
					fbcon_redraw_move(vc, p, b - count,
							  vc->vc_rows - b, b);
			} else
				fbcon_redraw_move(vc, p, t + count, b - t - count, t);
			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
			break;

		case SCROLL_PAN_MOVE:
			if ((p->yscroll + count <=
			     2 * (p->vrows - vc->vc_rows))
			    && ((!scroll_partial && (b - t == vc->vc_rows))
				|| (scroll_partial
				    && (b - t - count >
					3 * vc->vc_rows >> 2)))) {
				if (t > 0)
					fbcon_bmove(vc, 0, 0, count, 0, t,
						    vc->vc_cols);
				ypan_up(vc, count);
				if (vc->vc_rows - b > 0)
					fbcon_bmove(vc, b - count, 0, b, 0,
						    vc->vc_rows - b,
						    vc->vc_cols);
			} else if (info->flags & FBINFO_READS_FAST)
				fbcon_bmove(vc, t + count, 0, t, 0,
					    b - t - count, vc->vc_cols);
			else
				goto redraw_up;
			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
			break;

		case SCROLL_REDRAW:
		      redraw_up:
			fbcon_redraw(vc, p, t, b - t - count,
				     count * vc->vc_cols);
			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
			scr_memsetw((unsigned short *) (vc->vc_origin +
							vc->vc_size_row *
							(b - count)),
				    vc->vc_video_erase_char,
				    vc->vc_size_row * count);
			return 1;
		}
		break;

	case SM_DOWN:
		if (count > vc->vc_rows)	/* Maximum realistic size */
			count = vc->vc_rows;
		switch (p->scrollmode) {
		case SCROLL_MOVE:
			ops->bmove(vc, info, t, 0, t + count, 0,
				    b - t - count, vc->vc_cols);
			ops->clear(vc, info, t, 0, count, vc->vc_cols);
			break;

		case SCROLL_WRAP_MOVE:
			if (b - t - count > 3 * vc->vc_rows >> 2) {
				if (vc->vc_rows - b > 0)
					fbcon_bmove(vc, b, 0, b - count, 0,
						    vc->vc_rows - b,
						    vc->vc_cols);
				ywrap_down(vc, count);
				if (t > 0)
					fbcon_bmove(vc, count, 0, 0, 0, t,
						    vc->vc_cols);
			} else if (info->flags & FBINFO_READS_FAST)
				fbcon_bmove(vc, t, 0, t + count, 0,
					    b - t - count, vc->vc_cols);
			else
				goto redraw_down;
			fbcon_clear(vc, t, 0, count, vc->vc_cols);
			break;

		case SCROLL_PAN_MOVE:
			if ((count - p->yscroll <= p->vrows - vc->vc_rows)
			    && ((!scroll_partial && (b - t == vc->vc_rows))
				|| (scroll_partial
				    && (b - t - count >
					3 * vc->vc_rows >> 2)))) {
				if (vc->vc_rows - b > 0)
					fbcon_bmove(vc, b, 0, b - count, 0,
						    vc->vc_rows - b,
						    vc->vc_cols);
				ypan_down(vc, count);
				if (t > 0)
					fbcon_bmove(vc, count, 0, 0, 0, t,
						    vc->vc_cols);
			} else if (info->flags & FBINFO_READS_FAST)
				fbcon_bmove(vc, t, 0, t + count, 0,
					    b - t - count, vc->vc_cols);
			else
				goto redraw_down;
			fbcon_clear(vc, t, 0, count, vc->vc_cols);
			break;

		case SCROLL_PAN_REDRAW:
			if ((count - p->yscroll <= p->vrows - vc->vc_rows)
			    && ((!scroll_partial && (b - t == vc->vc_rows))
				|| (scroll_partial
				    && (b - t - count >
					3 * vc->vc_rows >> 2)))) {
				if (vc->vc_rows - b > 0)
					fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
							  b - count);
				ypan_down_redraw(vc, t, count);
				if (t > 0)
					fbcon_redraw_move(vc, p, count, t, 0);
			} else
				fbcon_redraw_move(vc, p, t, b - t - count, t + count);
			fbcon_clear(vc, t, 0, count, vc->vc_cols);
			break;

		case SCROLL_REDRAW:
		      redraw_down:
			fbcon_redraw(vc, p, b - 1, b - t - count,
				     -count * vc->vc_cols);
			fbcon_clear(vc, t, 0, count, vc->vc_cols);
			scr_memsetw((unsigned short *) (vc->vc_origin +
							vc->vc_size_row *
							t),
				    vc->vc_video_erase_char,
				    vc->vc_size_row * count);
			return 1;
		}
	}
	return 0;
}


static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
			int height, int width)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct display *p = &fb_display[vc->vc_num];
	
	if (fbcon_is_inactive(vc, info))
		return;

	if (!width || !height)
		return;

	/*  Split blits that cross physical y_wrap case.
	 *  Pathological case involves 4 blits, better to use recursive
	 *  code rather than unrolled case
	 *
	 *  Recursive invocations don't need to erase the cursor over and
	 *  over again, so we use fbcon_bmove_rec()
	 */
	fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
			p->vrows - p->yscroll);
}

static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx, 
			    int dy, int dx, int height, int width, u_int y_break)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;
	u_int b;

	if (sy < y_break && sy + height > y_break) {
		b = y_break - sy;
		if (dy < sy) {	/* Avoid trashing self */
			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
					y_break);
			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
					height - b, width, y_break);
		} else {
			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
					height - b, width, y_break);
			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
					y_break);
		}
		return;
	}

	if (dy < y_break && dy + height > y_break) {
		b = y_break - dy;
		if (dy < sy) {	/* Avoid trashing self */
			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
					y_break);
			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
					height - b, width, y_break);
		} else {
			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
					height - b, width, y_break);
			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
					y_break);
		}
		return;
	}
	ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
		   height, width);
}

static __inline__ void updatescrollmode(struct display *p, struct fb_info *info,
					struct vc_data *vc)
{
	int fh = vc->vc_font.height;
	int cap = info->flags;
	int good_pan = (cap & FBINFO_HWACCEL_YPAN)
		 && divides(info->fix.ypanstep, vc->vc_font.height)
		 && info->var.yres_virtual > info->var.yres;
	int good_wrap = (cap & FBINFO_HWACCEL_YWRAP)
		 && divides(info->fix.ywrapstep, vc->vc_font.height)
		 && divides(vc->vc_font.height, info->var.yres_virtual);
	int reading_fast = cap & FBINFO_READS_FAST;
	int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) && !(cap & FBINFO_HWACCEL_DISABLED);
	int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) && !(cap & FBINFO_HWACCEL_DISABLED);

	p->vrows = info->var.yres_virtual/fh;
	if (info->var.yres > (fh * (vc->vc_rows + 1)))
		p->vrows -= (info->var.yres - (fh * vc->vc_rows)) / fh;
	if ((info->var.yres % fh) && (info->var.yres_virtual % fh <
				      info->var.yres % fh))
		p->vrows--;

	if (good_wrap || good_pan) {
		if (reading_fast || fast_copyarea)
			p->scrollmode = good_wrap ? SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
		else
			p->scrollmode = good_wrap ? SCROLL_REDRAW :
				SCROLL_PAN_REDRAW;
	} else {
		if (reading_fast || (fast_copyarea && !fast_imageblit))
			p->scrollmode = SCROLL_MOVE;
		else
			p->scrollmode = SCROLL_REDRAW;
	}
}

static int fbcon_resize(struct vc_data *vc, unsigned int width, 
			unsigned int height)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct display *p = &fb_display[vc->vc_num];
	struct fb_var_screeninfo var = info->var;
	int x_diff, y_diff;
	int fw = vc->vc_font.width;
	int fh = vc->vc_font.height;

	var.xres = width * fw;
	var.yres = height * fh;
	x_diff = info->var.xres - var.xres;
	y_diff = info->var.yres - var.yres;
	if (x_diff < 0 || x_diff > fw || (y_diff < 0 || y_diff > fh)) {
		struct fb_videomode *mode;

		DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
		mode = fb_find_best_mode(&var, &info->modelist);
		if (mode == NULL)
			return -EINVAL;
		fb_videomode_to_var(&var, mode);
		if (width > var.xres/fw || height > var.yres/fh)
			return -EINVAL;
		/*
		 * The following can probably have any value... Do we need to
		 * set all of them?
		 */
		var.bits_per_pixel = p->bits_per_pixel;
		var.xres_virtual = p->xres_virtual;
		var.yres_virtual = p->yres_virtual;
		var.accel_flags = p->accel_flags;
		var.width = p->width;
		var.height = p->height;
		var.red = p->red;
		var.green = p->green;
		var.blue = p->blue;
		var.transp = p->transp;
		var.nonstd = p->nonstd;

		DPRINTK("resize now %ix%i\n", var.xres, var.yres);
		if (CON_IS_VISIBLE(vc)) {
			var.activate = FB_ACTIVATE_NOW |
				FB_ACTIVATE_FORCE;
			fb_set_var(info, &var);
			info->flags &= ~FBINFO_MISC_MODESWITCH;
		}
		var_to_display(p, &info->var, info);
	}
	updatescrollmode(p, info, vc);
	return 0;
}

static int fbcon_switch(struct vc_data *vc)
{
	struct fb_info *info;
	struct display *p = &fb_display[vc->vc_num];
	struct fb_var_screeninfo var;
	int i, prev_console, do_set_par = 0;

	info = registered_fb[con2fb_map[vc->vc_num]];

	if (softback_top) {
		int l = fbcon_softback_size / vc->vc_size_row;
		if (softback_lines)
			fbcon_set_origin(vc);
		softback_top = softback_curr = softback_in = softback_buf;
		softback_lines = 0;

		if (l > 5)
			softback_end = softback_buf + l * vc->vc_size_row;
		else {
			/* Smaller scrollback makes no sense, and 0 would screw
			   the operation totally */
			softback_top = 0;
		}
	}

	if (logo_shown >= 0) {
		struct vc_data *conp2 = vc_cons[logo_shown].d;

		if (conp2->vc_top == logo_lines
		    && conp2->vc_bottom == conp2->vc_rows)
			conp2->vc_top = 0;
		logo_shown = FBCON_LOGO_CANSHOW;
	}

	prev_console = ((struct fbcon_ops *)info->fbcon_par)->currcon;

	/*
	 * FIXME: If we have multiple fbdev's loaded, we need to
	 * update all info->currcon.  Perhaps, we can place this
	 * in a centralized structure, but this might break some
	 * drivers.
	 *
	 * info->currcon = vc->vc_num;
	 */
	for (i = 0; i < FB_MAX; i++) {
		if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
			struct fbcon_ops *ops = registered_fb[i]->fbcon_par;

			ops->currcon = vc->vc_num;
		}
	}
	memset(&var, 0, sizeof(struct fb_var_screeninfo));
	display_to_var(&var, p);
	var.activate = FB_ACTIVATE_NOW;

	/*
	 * make sure we don't unnecessarily trip the memcmp()
	 * in fb_set_var()
	 */
	info->var.activate = var.activate;
	info->var.yoffset = info->var.xoffset = p->yscroll = 0;
	fb_set_var(info, &var);

	if (prev_console != -1 &&
	    registered_fb[con2fb_map[prev_console]] != info)
		do_set_par = 1;

	if (do_set_par || info->flags & FBINFO_MISC_MODESWITCH) {
		if (info->fbops->fb_set_par)
			info->fbops->fb_set_par(info);
		info->flags &= ~FBINFO_MISC_MODESWITCH;
	}

	set_blitting_type(vc, info, p);
	((struct fbcon_ops *)info->fbcon_par)->cursor_reset = 1;

	vc->vc_can_do_color = (fb_get_color_depth(info) != 1);
	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
	updatescrollmode(p, info, vc);

	switch (p->scrollmode) {
	case SCROLL_WRAP_MOVE:
		scrollback_phys_max = p->vrows - vc->vc_rows;
		break;
	case SCROLL_PAN_MOVE:
	case SCROLL_PAN_REDRAW:
		scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
		if (scrollback_phys_max < 0)
			scrollback_phys_max = 0;
		break;
	default:
		scrollback_phys_max = 0;
		break;