fbcon.c

Linux环境下视频显示卡设备的驱动程序源代码

	if (var_to_display(p, &info->var, info))
		return;

	if (!info->fbcon_par)
		con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);

	/* If we are not the first console on this
	   fb, copy the font from that console */
	t = &fb_display[fg_console];
	if (!p->fontdata) {
		if (t->fontdata) {
			struct vc_data *fvc = vc_cons[fg_console].d;

			vc->vc_font.data = (void *)(p->fontdata =
						    fvc->vc_font.data);
			vc->vc_font.width = fvc->vc_font.width;
			vc->vc_font.height = fvc->vc_font.height;
			p->userfont = t->userfont;

			if (p->userfont)
				REFCOUNT(p->fontdata)++;
		} else {
			const struct font_desc *font = NULL;

			if (!fontname[0] || !(font = find_font(fontname)))
				font = get_default_font(info->var.xres,
							info->var.yres,
							info->pixmap.blit_x,
							info->pixmap.blit_y);
			vc->vc_font.width = font->width;
			vc->vc_font.height = font->height;
			vc->vc_font.data = (void *)(p->fontdata = font->data);
			vc->vc_font.charcount = 256; /* FIXME  Need to
							support more fonts */
		}
	}

	if (p->userfont)
		charcnt = FNTCHARCNT(p->fontdata);

	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
	if (charcnt == 256) {
		vc->vc_hi_font_mask = 0;
	} else {
		vc->vc_hi_font_mask = 0x100;
		if (vc->vc_can_do_color)
			vc->vc_complement_mask <<= 1;
	}

	if (!*svc->vc_uni_pagedir_loc)
		con_set_default_unimap(svc);
	if (!*vc->vc_uni_pagedir_loc)
		con_copy_unimap(vc, svc);

	ops = info->fbcon_par;
	p->con_rotate = initial_rotation;
	set_blitting_type(vc, info);

	cols = vc->vc_cols;
	rows = vc->vc_rows;
	new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
	new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
	new_cols /= vc->vc_font.width;
	new_rows /= vc->vc_font.height;
	vc_resize(vc, new_cols, new_rows);

	/*
	 * We must always set the mode. The mode of the previous console
	 * driver could be in the same resolution but we are using different
	 * hardware so we have to initialize the hardware.
	 *
	 * We need to do it in fbcon_init() to prevent screen corruption.
	 */
	if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
		if (info->fbops->fb_set_par &&
		    !(ops->flags & FBCON_FLAGS_INIT))
			info->fbops->fb_set_par(info);
		ops->flags |= FBCON_FLAGS_INIT;
	}

	ops->graphics = 0;

	if ((cap & FBINFO_HWACCEL_COPYAREA) &&
	    !(cap & FBINFO_HWACCEL_DISABLED))
		p->scrollmode = SCROLL_MOVE;
	else /* default to something safe */
		p->scrollmode = SCROLL_REDRAW;

	/*
	 *  ++guenther: console.c:vc_allocate() relies on initializing
	 *  vc_{cols,rows}, but we must not set those if we are only
	 *  resizing the console.
	 */
	if (!init) {
		vc->vc_cols = new_cols;
		vc->vc_rows = new_rows;
	}

	if (logo)
		fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);

	if (vc == svc && softback_buf)
		fbcon_update_softback(vc);

	if (ops->rotate_font && ops->rotate_font(info, vc)) {
		ops->rotate = FB_ROTATE_UR;
		set_blitting_type(vc, info);
	}

	ops->p = &fb_display[fg_console];
}

static void fbcon_free_font(struct display *p)
{
	if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
		kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
	p->fontdata = NULL;
	p->userfont = 0;
}

static void fbcon_deinit(struct vc_data *vc)
{
	struct display *p = &fb_display[vc->vc_num];
	struct fb_info *info;
	struct fbcon_ops *ops;
	int idx;

	fbcon_free_font(p);
	idx = con2fb_map[vc->vc_num];

	if (idx == -1)
		goto finished;

	info = registered_fb[idx];

	if (!info)
		goto finished;

	ops = info->fbcon_par;

	if (!ops)
		goto finished;

	if (CON_IS_VISIBLE(vc))
		fbcon_del_cursor_timer(info);

	ops->flags &= ~FBCON_FLAGS_INIT;
finished:

	if (!con_is_bound(&fb_con))
		fbcon_exit();

	return;
}

/* ====================================================================== */

/*  fbcon_XXX routines - interface used by the world
 *
 *  This system is now divided into two levels because of complications
 *  caused by hardware scrolling. Top level functions:
 *
 *	fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
 *
 *  handles y values in range [0, scr_height-1] that correspond to real
 *  screen positions. y_wrap shift means that first line of bitmap may be
 *  anywhere on this display. These functions convert lineoffsets to
 *  bitmap offsets and deal with the wrap-around case by splitting blits.
 *
 *	fbcon_bmove_physical_8()    -- These functions fast implementations
 *	fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
 *	fbcon_putc_physical_8()	    -- (font width != 8) may be added later
 *
 *  WARNING:
 *
 *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
 *  Implies should only really hardware scroll in rows. Only reason for
 *  restriction is simplicity & efficiency at the moment.
 */

static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
			int width)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;

	struct display *p = &fb_display[vc->vc_num];
	u_int y_break;

	if (fbcon_is_inactive(vc, info))
		return;

	if (!height || !width)
		return;

	if (sy < vc->vc_top && vc->vc_top == logo_lines)
		vc->vc_top = 0;

	/* Split blits that cross physical y_wrap boundary */

	y_break = p->vrows - p->yscroll;
	if (sy < y_break && sy + height - 1 >= y_break) {
		u_int b = y_break - sy;
		ops->clear(vc, info, real_y(p, sy), sx, b, width);
		ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
				 width);
	} else
		ops->clear(vc, info, real_y(p, sy), sx, height, width);
}

static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
			int count, int ypos, int xpos)
{
	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;

	if (!fbcon_is_inactive(vc, info))
		ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
			   get_color(vc, info, scr_readw(s), 1),
			   get_color(vc, info, scr_readw(s), 0));
}

static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
{
	unsigned short chr;

	scr_writew(c, &chr);
	fbcon_putcs(vc, &chr, 1, ypos, xpos);
}

static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;

	if (!fbcon_is_inactive(vc, info))
		ops->clear_margins(vc, info, bottom_only);
}

static void fbcon_cursor(struct vc_data *vc, int mode)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;
	int y;
 	int c = scr_readw((u16 *) vc->vc_pos);

	if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
		return;

	if (vc->vc_cursor_type & 0x10)
		fbcon_del_cursor_timer(info);
	else
		fbcon_add_cursor_timer(info);

	ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
	if (mode & CM_SOFTBACK) {
		mode &= ~CM_SOFTBACK;
		y = softback_lines;
	} else {
		if (softback_lines)
			fbcon_set_origin(vc);
		y = 0;
	}

	ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
		    get_color(vc, info, c, 0));
	vbl_cursor_cnt = CURSOR_DRAW_DELAY;
}

static int scrollback_phys_max = 0;
static int scrollback_max = 0;
static int scrollback_current = 0;

static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
			   int unit)
{
	struct display *p, *t;
	struct vc_data **default_mode, *vc;
	struct vc_data *svc;
	struct fbcon_ops *ops = info->fbcon_par;
	int rows, cols, charcnt = 256;

	p = &fb_display[unit];

	if (var_to_display(p, var, info))
		return;

	vc = vc_cons[unit].d;

	if (!vc)
		return;

	default_mode = vc->vc_display_fg;
	svc = *default_mode;
	t = &fb_display[svc->vc_num];

	if (!vc->vc_font.data) {
		vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
		vc->vc_font.width = (*default_mode)->vc_font.width;
		vc->vc_font.height = (*default_mode)->vc_font.height;
		p->userfont = t->userfont;
		if (p->userfont)
			REFCOUNT(p->fontdata)++;
	}
	if (p->userfont)
		charcnt = FNTCHARCNT(p->fontdata);

	var->activate = FB_ACTIVATE_NOW;
	info->var.activate = var->activate;
	var->yoffset = info->var.yoffset;
	var->xoffset = info->var.xoffset;
	fb_set_var(info, var);
	ops->var = info->var;
	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
	if (charcnt == 256) {
		vc->vc_hi_font_mask = 0;
	} else {
		vc->vc_hi_font_mask = 0x100;
		if (vc->vc_can_do_color)
			vc->vc_complement_mask <<= 1;
	}

	if (!*svc->vc_uni_pagedir_loc)
		con_set_default_unimap(svc);
	if (!*vc->vc_uni_pagedir_loc)
		con_copy_unimap(vc, svc);

	cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
	rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
	cols /= vc->vc_font.width;
	rows /= vc->vc_font.height;
	vc_resize(vc, cols, rows);

	if (CON_IS_VISIBLE(vc)) {
		update_screen(vc);
		if (softback_buf)
			fbcon_update_softback(vc);
	}
}

static __inline__ void ywrap_up(struct vc_data *vc, int count)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;
	struct display *p = &fb_display[vc->vc_num];
	
	p->yscroll += count;
	if (p->yscroll >= p->vrows)	/* Deal with wrap */
		p->yscroll -= p->vrows;
	ops->var.xoffset = 0;
	ops->var.yoffset = p->yscroll * vc->vc_font.height;
	ops->var.vmode |= FB_VMODE_YWRAP;
	ops->update_start(info);
	scrollback_max += count;
	if (scrollback_max > scrollback_phys_max)
		scrollback_max = scrollback_phys_max;
	scrollback_current = 0;
}

static __inline__ void ywrap_down(struct vc_data *vc, int count)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;
	struct display *p = &fb_display[vc->vc_num];
	
	p->yscroll -= count;
	if (p->yscroll < 0)	/* Deal with wrap */
		p->yscroll += p->vrows;
	ops->var.xoffset = 0;
	ops->var.yoffset = p->yscroll * vc->vc_font.height;
	ops->var.vmode |= FB_VMODE_YWRAP;
	ops->update_start(info);
	scrollback_max -= count;
	if (scrollback_max < 0)
		scrollback_max = 0;
	scrollback_current = 0;
}

static __inline__ void ypan_up(struct vc_data *vc, 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;

	p->yscroll += count;
	if (p->yscroll > p->vrows - vc->vc_rows) {
		ops->bmove(vc, info, p->vrows - vc->vc_rows,
			    0, 0, 0, vc->vc_rows, vc->vc_cols);
		p->yscroll -= p->vrows - vc->vc_rows;
	}

	ops->var.xoffset = 0;
	ops->var.yoffset = p->yscroll * vc->vc_font.height;
	ops->var.vmode &= ~FB_VMODE_YWRAP;
	ops->update_start(info);
	fbcon_clear_margins(vc, 1);
	scrollback_max += count;
	if (scrollback_max > scrollback_phys_max)
		scrollback_max = scrollback_phys_max;
	scrollback_current = 0;
}

static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;
	struct display *p = &fb_display[vc->vc_num];

	p->yscroll += count;

	if (p->yscroll > p->vrows - vc->vc_rows) {
		p->yscroll -= p->vrows - vc->vc_rows;
		fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
	}

	ops->var.xoffset = 0;
	ops->var.yoffset = p->yscroll * vc->vc_font.height;
	ops->var.vmode &= ~FB_VMODE_YWRAP;
	ops->update_start(info);
	fbcon_clear_margins(vc, 1);
	scrollback_max += count;
	if (scrollback_max > scrollback_phys_max)
		scrollback_max = scrollback_phys_max;
	scrollback_current = 0;
}

static __inline__ void ypan_down(struct vc_data *vc, 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;
	
	p->yscroll -= count;
	if (p->yscroll < 0) {
		ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
			    0, vc->vc_rows, vc->vc_cols);
		p->yscroll += p->vrows - vc->vc_rows;
	}

	ops->var.xoffset = 0;
	ops->var.yoffset = p->yscroll * vc->vc_font.height;
	ops->var.vmode &= ~FB_VMODE_YWRAP;
	ops->update_start(info);
	fbcon_clear_margins(vc, 1);
	scrollback_max -= count;
	if (scrollback_max < 0)
		scrollback_max = 0;
	scrollback_current = 0;
}

static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct fbcon_ops *ops = info->fbcon_par;
	struct display *p = &fb_display[vc->vc_num];

	p->yscroll -= count;

	if (p->yscroll < 0) {
		p->yscroll += p->vrows - vc->vc_rows;
		fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
	}

	ops->var.xoffset = 0;
	ops->var.yoffset = p->yscroll * vc->vc_font.height;
	ops->var.vmode &= ~FB_VMODE_YWRAP;
	ops->update_start(info);
	fbcon_clear_margins(vc, 1);
	scrollback_max -= count;
	if (scrollback_max < 0)
		scrollback_max = 0;
	scrollback_current = 0;
}

static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
				  long delta)
{
	int count = vc->vc_rows;
	unsigned short *d, *s;
	unsigned long n;
	int line = 0;

	d = (u16 *) softback_curr;
	if (d == (u16 *) softback_in)
		d = (u16 *) vc->vc_origin;
	n = softback_curr + delta * vc->vc_size_row;
	softback_lines -= delta;
	if (delta < 0) {
		if (softback_curr < softback_top && n < softback_buf) {
			n += softback_end - softback_buf;
			if (n < softback_top) {
				softback_lines -=
				    (softback_top - n) / vc->vc_size_row;
				n = softback_top;
			}
		} else if (softback_curr >= softback_top
			   && n < softback_top) {
			softback_lines -=
			    (softback_top - n) / vc->vc_size_row;
			n = softback_top;
		}
	} else {
		if (softback_curr > softback_in && n >= softback_end) {
			n += softback_buf - softback_end;
			if (n > softback_in) {