fbcon.c

h内核

#else
static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
			      struct display *p)
{
	struct fbcon_ops *ops = info->fbcon_par;

	info->flags &= ~FBINFO_MISC_TILEBLITTING;
	fbcon_set_bitops(ops);
}
#endif /* CONFIG_MISC_TILEBLITTING */


static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
				  int unit, int oldidx)
{
	struct fbcon_ops *ops = NULL;
	int err = 0;

	if (!try_module_get(info->fbops->owner))
		err = -ENODEV;

	if (!err && info->fbops->fb_open &&
	    info->fbops->fb_open(info, 0))
		err = -ENODEV;

	if (!err) {
		ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
		if (!ops)
			err = -ENOMEM;
	}

	if (!err) {
		memset(ops, 0, sizeof(struct fbcon_ops));
		info->fbcon_par = ops;
		set_blitting_type(vc, info, NULL);
	}

	if (err) {
		con2fb_map[unit] = oldidx;
		module_put(info->fbops->owner);
	}

	return err;
}

static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
				  struct fb_info *newinfo, int unit,
				  int oldidx, int found)
{
	struct fbcon_ops *ops = oldinfo->fbcon_par;
	int err = 0;

	if (oldinfo->fbops->fb_release &&
	    oldinfo->fbops->fb_release(oldinfo, 0)) {
		con2fb_map[unit] = oldidx;
		if (!found && newinfo->fbops->fb_release)
			newinfo->fbops->fb_release(newinfo, 0);
		if (!found)
			module_put(newinfo->fbops->owner);
		err = -ENODEV;
	}

	if (!err) {
		if (oldinfo->queue.func == fb_flashcursor)
			del_timer_sync(&ops->cursor_timer);

		kfree(ops->cursor_state.mask);
		kfree(ops->cursor_data);
		kfree(oldinfo->fbcon_par);
		oldinfo->fbcon_par = NULL;
		module_put(oldinfo->fbops->owner);
	}

	return err;
}

static void con2fb_init_newinfo(struct fb_info *info)
{
	if (!info->queue.func || info->queue.func == fb_flashcursor) {
		struct fbcon_ops *ops = info->fbcon_par;

		if (!info->queue.func)
			INIT_WORK(&info->queue, fb_flashcursor, info);

		init_timer(&ops->cursor_timer);
		ops->cursor_timer.function = cursor_timer_handler;
		ops->cursor_timer.expires = jiffies + HZ / 5;
		ops->cursor_timer.data = (unsigned long ) info;
		add_timer(&ops->cursor_timer);
	}
}

static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
				int unit, int show_logo)
{
	struct fbcon_ops *ops = info->fbcon_par;

	ops->currcon = fg_console;

	if (info->fbops->fb_set_par)
		info->fbops->fb_set_par(info);

	if (vc)
		fbcon_set_disp(info, vc);
	else
		fbcon_preset_disp(info, unit);

	if (show_logo) {
		struct vc_data *fg_vc = vc_cons[fg_console].d;
		struct fb_info *fg_info =
			registered_fb[con2fb_map[fg_console]];

		fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
				   fg_vc->vc_rows, fg_vc->vc_cols,
				   fg_vc->vc_rows);
	}

	switch_screen(fg_console);
}

/**
 *	set_con2fb_map - map console to frame buffer device
 *	@unit: virtual console number to map
 *	@newidx: frame buffer index to map virtual console to
 *      @user: user request
 *
 *	Maps a virtual console @unit to a frame buffer device
 *	@newidx.
 */
static int set_con2fb_map(int unit, int newidx, int user)
{
	struct vc_data *vc = vc_cons[unit].d;
	int oldidx = con2fb_map[unit];
	struct fb_info *info = registered_fb[newidx];
	struct fb_info *oldinfo = NULL;
 	int found, err = 0;

	if (oldidx == newidx)
		return 0;

	if (!info)
 		err =  -EINVAL;

 	if (!err && !search_for_mapped_con()) {
		info_idx = newidx;
		return fbcon_takeover(0);
	}

	if (oldidx != -1)
		oldinfo = registered_fb[oldidx];

	found = search_fb_in_map(newidx);

	acquire_console_sem();
	con2fb_map[unit] = newidx;
	if (!err && !found)
 		err = con2fb_acquire_newinfo(vc, info, unit, oldidx);


	/*
	 * If old fb is not mapped to any of the consoles,
	 * fbcon should release it.
	 */
 	if (!err && oldinfo && !search_fb_in_map(oldidx))
 		err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 					     found);

 	if (!err) {
 		int show_logo = (fg_console == 0 && !user &&
 				 logo_shown != FBCON_LOGO_DONTSHOW);

 		if (!found)
 			con2fb_init_newinfo(info);
 		con2fb_map_boot[unit] = newidx;
 		con2fb_init_display(vc, info, unit, show_logo);
	}

	release_console_sem();
 	return err;
}

/*
 *  Low Level Operations
 */
/* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
static int var_to_display(struct display *disp,
			  struct fb_var_screeninfo *var,
			  struct fb_info *info)
{
	disp->xres_virtual = var->xres_virtual;
	disp->yres_virtual = var->yres_virtual;
	disp->bits_per_pixel = var->bits_per_pixel;
	disp->grayscale = var->grayscale;
	disp->nonstd = var->nonstd;
	disp->accel_flags = var->accel_flags;
	disp->height = var->height;
	disp->width = var->width;
	disp->red = var->red;
	disp->green = var->green;
	disp->blue = var->blue;
	disp->transp = var->transp;
	disp->mode = fb_match_mode(var, &info->modelist);
	if (disp->mode == NULL)
		/* This should not happen */
		return -EINVAL;
	return 0;
}

static void display_to_var(struct fb_var_screeninfo *var,
			   struct display *disp)
{
	fb_videomode_to_var(var, disp->mode);
	var->xres_virtual = disp->xres_virtual;
	var->yres_virtual = disp->yres_virtual;
	var->bits_per_pixel = disp->bits_per_pixel;
	var->grayscale = disp->grayscale;
	var->nonstd = disp->nonstd;
	var->accel_flags = disp->accel_flags;
	var->height = disp->height;
	var->width = disp->width;
	var->red = disp->red;
	var->green = disp->green;
	var->blue = disp->blue;
	var->transp = disp->transp;
}

static const char *fbcon_startup(void)
{
	const char *display_desc = "frame buffer device";
	struct display *p = &fb_display[fg_console];
	struct vc_data *vc = vc_cons[fg_console].d;
	struct font_desc *font = NULL;
	struct module *owner;
	struct fb_info *info = NULL;
	struct fbcon_ops *ops;
	int rows, cols;
	int irqres;

	irqres = 1;
	/*
	 *  If num_registered_fb is zero, this is a call for the dummy part.
	 *  The frame buffer devices weren't initialized yet.
	 */
	if (!num_registered_fb || info_idx == -1)
		return display_desc;
	/*
	 * Instead of blindly using registered_fb[0], we use info_idx, set by
	 * fb_console_init();
	 */
	info = registered_fb[info_idx];
	if (!info)
		return NULL;
	
	owner = info->fbops->owner;
	if (!try_module_get(owner))
		return NULL;
	if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
		module_put(owner);
		return NULL;
	}

	ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
	if (!ops) {
		module_put(owner);
		return NULL;
	}

	memset(ops, 0, sizeof(struct fbcon_ops));
	ops->currcon = -1;
	info->fbcon_par = ops;
	set_blitting_type(vc, info, NULL);

	if (info->fix.type != FB_TYPE_TEXT) {
		if (fbcon_softback_size) {
			if (!softback_buf) {
				softback_buf =
				    (unsigned long)
				    kmalloc(fbcon_softback_size,
					    GFP_KERNEL);
				if (!softback_buf) {
					fbcon_softback_size = 0;
					softback_top = 0;
				}
			}
		} else {
			if (softback_buf) {
				kfree((void *) softback_buf);
				softback_buf = 0;
				softback_top = 0;
			}
		}
		if (softback_buf)
			softback_in = softback_top = softback_curr =
			    softback_buf;
		softback_lines = 0;
	}

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

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

	DPRINTK("mode:   %s\n", info->fix.id);
	DPRINTK("visual: %d\n", info->fix.visual);
	DPRINTK("res:    %dx%d-%d\n", info->var.xres,
		info->var.yres,
		info->var.bits_per_pixel);

#ifdef CONFIG_ATARI
	if (MACH_IS_ATARI) {
		cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
		irqres =
		    request_irq(IRQ_AUTO_4, fb_vbl_handler,
				IRQ_TYPE_PRIO, "framebuffer vbl",
				info);
	}
#endif				/* CONFIG_ATARI */

#ifdef CONFIG_MAC
	/*
	 * On a Macintoy, the VBL interrupt may or may not be active. 
	 * As interrupt based cursor is more reliable and race free, we 
	 * probe for VBL interrupts.
	 */
	if (MACH_IS_MAC) {
		int ct = 0;
		/*
		 * Probe for VBL: set temp. handler ...
		 */
		irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
				     "framebuffer vbl", info);
		vbl_detected = 0;

		/*
		 * ... and spin for 20 ms ...
		 */
		while (!vbl_detected && ++ct < 1000)
			udelay(20);

		if (ct == 1000)
			printk
			    ("fbcon_startup: No VBL detected, using timer based cursor.\n");

		free_irq(IRQ_MAC_VBL, fb_vbl_detect);

		if (vbl_detected) {
			/*
			 * interrupt based cursor ok
			 */
			cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
			irqres =
			    request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
					"framebuffer vbl", info);
		} else {
			/*
			 * VBL not detected: fall through, use timer based cursor
			 */
			irqres = 1;
		}
	}
#endif				/* CONFIG_MAC */

#if defined(__arm__) && defined(IRQ_VSYNCPULSE)
	cursor_blink_rate = ARM_CURSOR_BLINK_RATE;
	irqres = request_irq(IRQ_VSYNCPULSE, fb_vbl_handler, SA_SHIRQ,
			     "framebuffer vbl", info);
#endif
	/* Initialize the work queue. If the driver provides its
	 * own work queue this means it will use something besides 
	 * default timer to flash the cursor. */
	if (!info->queue.func) {
		INIT_WORK(&info->queue, fb_flashcursor, info);

		init_timer(&ops->cursor_timer);
		ops->cursor_timer.function = cursor_timer_handler;
		ops->cursor_timer.expires = jiffies + HZ / 5;
		ops->cursor_timer.data = (unsigned long ) info;
		add_timer(&ops->cursor_timer);
	}
	return display_desc;
}

static void fbcon_init(struct vc_data *vc, int init)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	struct vc_data **default_mode = vc->vc_display_fg;
	struct vc_data *svc = *default_mode;
	struct display *t, *p = &fb_display[vc->vc_num];
	int display_fg = (*default_mode)->vc_num;
	int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
	int cap = info->flags;

	if (info_idx == -1 || info == NULL)
	    return;
	if (vc->vc_num != display_fg || logo_shown == FBCON_LOGO_DONTSHOW ||
	    (info->fix.type == FB_TYPE_TEXT))
		logo = 0;

	info->var.xoffset = info->var.yoffset = p->yscroll = 0;	/* reset wrap/pan */

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

	/* If we are not the first console on this
	   fb, copy the font from that console */
	t = &fb_display[display_fg];
	if (!vc->vc_font.data) {
		vc->vc_font.data = 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);
	vc->vc_can_do_color = (fb_get_color_depth(info) != 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(display_fg);
	if (!*vc->vc_uni_pagedir_loc)
		con_copy_unimap(vc->vc_num, display_fg);

	cols = vc->vc_cols;
	rows = vc->vc_rows;
	new_cols = info->var.xres / vc->vc_font.width;
	new_rows = info->var.yres / vc->vc_font.height;
	vc_resize(vc->vc_num, 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) && info->fbops->fb_set_par)
		info->fbops->fb_set_par(info);


	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->vc_num == display_fg && softback_buf) {
		int l = fbcon_softback_size / vc->vc_size_row;
		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;
		}
	}
}

static void fbcon_deinit(struct vc_data *vc)
{
	struct display *p = &fb_display[vc->vc_num];

	if (info_idx != -1)
	    return;