text: /*
   *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   *
   *	Copyright (C) 1995 Geert Uytterhoeven
   *
   *
   *  This file is based on the original Amiga console driver (amicon.c):
   *
   *	Copyright (C) 1993 Hamish Macdonald
   *			   Greg Harp
   *	Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
   *
   *	      with work by William Rucklidge (wjr@cs.cornell.edu)
   *			   Geert Uytterhoeven
   *			   Jes Sorensen (jds@kom.auc.dk)
   *			   Martin Apel
   *
   *  and on the original Atari console driver (atacon.c):
   *
   *	Copyright (C) 1993 Bjoern Brauel
   *			   Roman Hodek
   *
   *	      with work by Guenther Kelleter
   *			   Martin Schaller
   *			   Andreas Schwab
   *
   *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
   *  Smart redraw scrolling, arbitrary font width support, 512char font support
   *  and software scrollback added by 
   *                         Jakub Jelinek (jj@ultra.linux.cz)
   *
   *  Random hacking by Martin Mares <mj@ucw.cz>
   *
   *	2001 - Documented with DocBook
   *	- Brad Douglas <brad@neruo.com>
   *
   *  The low level operations for the various display memory organizations are
   *  now in separate source files.
   *
   *  Currently the following organizations are supported:
   *
   *    o afb			Amiga bitplanes
   *    o cfb{2,4,8,16,24,32}	Packed pixels
   *    o ilbm			Amiga interleaved bitplanes
   *    o iplan2p[248]		Atari interleaved bitplanes
   *    o mfb			Monochrome
   *    o vga			VGA characters/attributes
   *
   *  To do:
   *
   *    - Implement 16 plane mode (iplan2p16)
   *
   *
   *  This file is subject to the terms and conditions of the GNU General Public
   *  License.  See the file COPYING in the main directory of this archive for
   *  more details.
   */
  
  #undef FBCONDEBUG
  
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/fs.h>
  #include <linux/kernel.h>
  #include <linux/delay.h>	/* MSch: for IRQ probe */
  #include <linux/console.h>
  #include <linux/string.h>
  #include <linux/kd.h>
  #include <linux/slab.h>
  #include <linux/fb.h>
  #include <linux/vt_kern.h>
  #include <linux/selection.h>
  #include <linux/font.h>
  #include <linux/smp.h>
  #include <linux/init.h>
  #include <linux/interrupt.h>
  #include <linux/crc32.h> /* For counting font checksums */
  #include <asm/fb.h>
  #include <asm/irq.h>
  #include <asm/system.h>
  #ifdef CONFIG_ATARI
  #include <asm/atariints.h>
  #endif
  #ifdef CONFIG_MAC
  #include <asm/macints.h>
  #endif
  #if defined(__mc68000__) || defined(CONFIG_APUS)
  #include <asm/machdep.h>
  #include <asm/setup.h>
  #endif
  
  #include "fbcon.h"
  
  #ifdef FBCONDEBUG
  #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
  #else
  #  define DPRINTK(fmt, args...)
  #endif
  
  enum {
  	FBCON_LOGO_CANSHOW	= -1,	/* the logo can be shown */
  	FBCON_LOGO_DRAW		= -2,	/* draw the logo to a console */
  	FBCON_LOGO_DONTSHOW	= -3	/* do not show the logo */
  };
  
  static struct display fb_display[MAX_NR_CONSOLES];
  
  static signed char con2fb_map[MAX_NR_CONSOLES];
  static signed char con2fb_map_boot[MAX_NR_CONSOLES];
  #ifndef MODULE
  static int logo_height;
  #endif
  static int logo_lines;
  /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
     enums.  */
  static int logo_shown = FBCON_LOGO_CANSHOW;
  /* Software scrollback */
  static int fbcon_softback_size = 32768;
  static unsigned long softback_buf, softback_curr;
  static unsigned long softback_in;
  static unsigned long softback_top, softback_end;
  static int softback_lines;
  /* console mappings */
  static int first_fb_vc;
  static int last_fb_vc = MAX_NR_CONSOLES - 1;
  static int fbcon_is_default = 1; 
  static int fbcon_has_exited;
  static int primary_device = -1;
  
  #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
  static int map_override;
  
  static inline void fbcon_map_override(void)
  {
  	map_override = 1;
  }
  #else
  static inline void fbcon_map_override(void)
  {
  }
  #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
  
  /* font data */
  static char fontname[40];
  
  /* current fb_info */
  static int info_idx = -1;
  
  /* console rotation */
  static int rotate;
  static int fbcon_has_sysfs;
  
  static const struct consw fb_con;
  
  #define CM_SOFTBACK	(8)
  
  #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
  
  static int fbcon_set_origin(struct vc_data *);
  
  #define CURSOR_DRAW_DELAY		(1)
  
  /* # VBL ints between cursor state changes */
  #define ATARI_CURSOR_BLINK_RATE		(42)
  #define MAC_CURSOR_BLINK_RATE		(32)
  #define DEFAULT_CURSOR_BLINK_RATE	(20)
  
  static int vbl_cursor_cnt;
  static int fbcon_cursor_noblink;
  
  #define divides(a, b)	((!(a) || (b)%(a)) ? 0 : 1)
  
  /*
   *  Interface used by the world
   */
  
  static const char *fbcon_startup(void);
  static void fbcon_init(struct vc_data *vc, int init);
  static void fbcon_deinit(struct vc_data *vc);
  static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
  			int width);
  static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
  static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
  			int count, int ypos, int xpos);
  static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
  static void fbcon_cursor(struct vc_data *vc, int mode);
  static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
  			int count);
  static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
  			int height, int width);
  static int fbcon_switch(struct vc_data *vc);
  static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
  static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
  static int fbcon_scrolldelta(struct vc_data *vc, int lines);
  
  /*
   *  Internal routines
   */
  static __inline__ void ywrap_up(struct vc_data *vc, int count);
  static __inline__ void ywrap_down(struct vc_data *vc, int count);
  static __inline__ void ypan_up(struct vc_data *vc, int count);
  static __inline__ void ypan_down(struct vc_data *vc, int count);
  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);
  static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
  			   int unit);
  static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
  			      int line, int count, int dy);
  static void fbcon_modechanged(struct fb_info *info);
  static void fbcon_set_all_vcs(struct fb_info *info);
  static void fbcon_start(void);
  static void fbcon_exit(void);
  static struct device *fbcon_device;
  
  #ifdef CONFIG_MAC
  /*
   * On the Macintoy, there may or may not be a working VBL int. We need to probe
   */
  static int vbl_detected;
  
  static irqreturn_t fb_vbl_detect(int irq, void *dummy)
  {
  	vbl_detected++;
  	return IRQ_HANDLED;
  }
  #endif
  
  #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
  static inline void fbcon_set_rotation(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
  	    ops->p->con_rotate < 4)
  		ops->rotate = ops->p->con_rotate;
  	else
  		ops->rotate = 0;
  }
  
  static void fbcon_rotate(struct fb_info *info, u32 rotate)
  {
  	struct fbcon_ops *ops= info->fbcon_par;
  	struct fb_info *fb_info;
  
  	if (!ops || ops->currcon == -1)
  		return;
  
  	fb_info = registered_fb[con2fb_map[ops->currcon]];
  
  	if (info == fb_info) {
  		struct display *p = &fb_display[ops->currcon];
  
  		if (rotate < 4)
  			p->con_rotate = rotate;
  		else
  			p->con_rotate = 0;
  
  		fbcon_modechanged(info);
  	}
  }
  
  static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  	struct vc_data *vc;
  	struct display *p;
  	int i;
  
  	if (!ops || ops->currcon < 0 || rotate > 3)
  		return;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		vc = vc_cons[i].d;
  		if (!vc || vc->vc_mode != KD_TEXT ||
  		    registered_fb[con2fb_map[i]] != info)
  			continue;
  
  		p = &fb_display[vc->vc_num];
  		p->con_rotate = rotate;
  	}
  
  	fbcon_set_all_vcs(info);
  }
  #else
  static inline void fbcon_set_rotation(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	ops->rotate = FB_ROTATE_UR;
  }
  
  static void fbcon_rotate(struct fb_info *info, u32 rotate)
  {
  	return;
  }
  
  static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
  {
  	return;
  }
  #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
  
  static int fbcon_get_rotate(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	return (ops) ? ops->rotate : 0;
  }
  
  static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	return (info->state != FBINFO_STATE_RUNNING ||
  		vc->vc_mode != KD_TEXT || ops->graphics);
  }
  
  static inline int get_color(struct vc_data *vc, struct fb_info *info,
  	      u16 c, int is_fg)
  {
  	int depth = fb_get_color_depth(&info->var, &info->fix);
  	int color = 0;
  
  	if (console_blanked) {
  		unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
  
  		c = vc->vc_video_erase_char & charmask;
  	}
  
  	if (depth != 1)
  		color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
  			: attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
  
  	switch (depth) {
  	case 1:
  	{
  		int col = ~(0xfff << (max(info->var.green.length,
  					  max(info->var.red.length,
  					      info->var.blue.length)))) & 0xff;
  
  		/* 0 or 1 */
  		int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
  		int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
  
  		if (console_blanked)
  			fg = bg;
  
  		color = (is_fg) ? fg : bg;
  		break;
  	}
  	case 2:
  		/*
  		 * Scale down 16-colors to 4 colors. Default 4-color palette
  		 * is grayscale. However, simply dividing the values by 4
  		 * will not work, as colors 1, 2 and 3 will be scaled-down
  		 * to zero rendering them invisible.  So empirically convert
  		 * colors to a sane 4-level grayscale.
  		 */
  		switch (color) {
  		case 0:
  			color = 0; /* black */
  			break;
  		case 1 ... 6:
  			color = 2; /* white */
  			break;
  		case 7 ... 8:
  			color = 1; /* gray */
  			break;
  		default:
  			color = 3; /* intense white */
  			break;
  		}
  		break;
  	case 3:
  		/*
  		 * Last 8 entries of default 16-color palette is a more intense
  		 * version of the first 8 (i.e., same chrominance, different
  		 * luminance).
  		 */
  		color &= 7;
  		break;
  	}
  
  
  	return color;
  }
  
  static void fbcon_update_softback(struct vc_data *vc)
  {
  	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 fb_flashcursor(struct work_struct *work)
  {
  	struct fb_info *info = container_of(work, struct fb_info, queue);
  	struct fbcon_ops *ops = info->fbcon_par;
  	struct display *p;
  	struct vc_data *vc = NULL;
  	int c;
  	int mode;
  
  	acquire_console_sem();
  	if (ops && ops->currcon != -1)
  		vc = vc_cons[ops->currcon].d;
  
  	if (!vc || !CON_IS_VISIBLE(vc) ||
   	    registered_fb[con2fb_map[vc->vc_num]] != info ||
  	    vc->vc_deccm != 1) {
  		release_console_sem();
  		return;
  	}
  
  	p = &fb_display[vc->vc_num];
  	c = scr_readw((u16 *) vc->vc_pos);
  	mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
  		CM_ERASE : CM_DRAW;
  	ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
  		    get_color(vc, info, c, 0));
  	release_console_sem();
  }
  
  #if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
  static int cursor_blink_rate;
  static irqreturn_t fb_vbl_handler(int irq, void *dev_id)
  {
  	struct fb_info *info = dev_id;
  
  	if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
  		schedule_work(&info->queue);	
  		vbl_cursor_cnt = cursor_blink_rate; 
  	}
  	return IRQ_HANDLED;
  }
  #endif
  	
  static void cursor_timer_handler(unsigned long dev_addr)
  {
  	struct fb_info *info = (struct fb_info *) dev_addr;
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	schedule_work(&info->queue);
  	mod_timer(&ops->cursor_timer, jiffies + HZ/5);
  }
  
  static void fbcon_add_cursor_timer(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
  	    !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
  	    !fbcon_cursor_noblink) {
  		if (!info->queue.func)
  			INIT_WORK(&info->queue, fb_flashcursor);
  
  		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);
  		ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
  	}
  }
  
  static void fbcon_del_cursor_timer(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	if (info->queue.func == fb_flashcursor &&
  	    ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
  		del_timer_sync(&ops->cursor_timer);
  		ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
  	}
  }
  
  #ifndef MODULE
  static int __init fb_console_setup(char *this_opt)
  {
  	char *options;
  	int i, j;
  
  	if (!this_opt || !*this_opt)
  		return 1;
  
  	while ((options = strsep(&this_opt, ",")) != NULL) {
  		if (!strncmp(options, "font:", 5))
  			strcpy(fontname, options + 5);
  		
  		if (!strncmp(options, "scrollback:", 11)) {
  			options += 11;
  			if (*options) {
  				fbcon_softback_size = simple_strtoul(options, &options, 0);
  				if (*options == 'k' || *options == 'K') {
  					fbcon_softback_size *= 1024;
  					options++;
  				}
  				if (*options != ',')
  					return 1;
  				options++;
  			} else
  				return 1;
  		}
  		
  		if (!strncmp(options, "map:", 4)) {
  			options += 4;
  			if (*options) {
  				for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
  					if (!options[j])
  						j = 0;
  					con2fb_map_boot[i] =
  						(options[j++]-'0') % FB_MAX;
  				}
  
  				fbcon_map_override();
  			}
  
  			return 1;
  		}
  
  		if (!strncmp(options, "vc:", 3)) {
  			options += 3;
  			if (*options)
  				first_fb_vc = simple_strtoul(options, &options, 10) - 1;
  			if (first_fb_vc < 0)
  				first_fb_vc = 0;
  			if (*options++ == '-')
  				last_fb_vc = simple_strtoul(options, &options, 10) - 1;
  			fbcon_is_default = 0; 
  		}	
  
  		if (!strncmp(options, "rotate:", 7)) {
  			options += 7;
  			if (*options)
  				rotate = simple_strtoul(options, &options, 0);
  			if (rotate > 3)
  				rotate = 0;
  		}
  	}
  	return 1;
  }
  
  __setup("fbcon=", fb_console_setup);
  #endif
  
  static int search_fb_in_map(int idx)
  {
  	int i, retval = 0;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		if (con2fb_map[i] == idx)
  			retval = 1;
  	}
  	return retval;
  }
  
  static int search_for_mapped_con(void)
  {
  	int i, retval = 0;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		if (con2fb_map[i] != -1)
  			retval = 1;
  	}
  	return retval;
  }
  
  static int fbcon_takeover(int show_logo)
  {
  	int err, i;
  
  	if (!num_registered_fb)
  		return -ENODEV;
  
  	if (!show_logo)
  		logo_shown = FBCON_LOGO_DONTSHOW;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++)
  		con2fb_map[i] = info_idx;
  
  	err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
  				fbcon_is_default);
  
  	if (err) {
  		for (i = first_fb_vc; i <= last_fb_vc; i++) {
  			con2fb_map[i] = -1;
  		}
  		info_idx = -1;
  	}
  
  	return err;
  }
  
  #ifdef MODULE
  static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
  			       int cols, int rows, int new_cols, int new_rows)
  {
  	logo_shown = FBCON_LOGO_DONTSHOW;
  }
  #else
  static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
  			       int cols, int rows, int new_cols, int new_rows)
  {
  	/* Need to make room for the logo */
  	struct fbcon_ops *ops = info->fbcon_par;
  	int cnt, erase = vc->vc_video_erase_char, step;
  	unsigned short *save = NULL, *r, *q;
  
  	if (info->flags & FBINFO_MODULE) {
  		logo_shown = FBCON_LOGO_DONTSHOW;
  		return;
  	}
  
  	/*
  	 * remove underline attribute from erase character
  	 * if black and white framebuffer.
  	 */
  	if (fb_get_color_depth(&info->var, &info->fix) == 1)
  		erase &= ~0x400;
  	logo_height = fb_prepare_logo(info, ops->rotate);
  	logo_lines = (logo_height + vc->vc_font.height - 1) /
  		vc->vc_font.height;
  	q = (unsigned short *) (vc->vc_origin +
  				vc->vc_size_row * rows);
  	step = logo_lines * cols;
  	for (r = q - logo_lines * cols; r < q; r++)
  		if (scr_readw(r) != vc->vc_video_erase_char)
  			break;
  	if (r != q && new_rows >= rows + logo_lines) {
  		save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
  		if (save) {
  			int i = cols < new_cols ? cols : new_cols;
  			scr_memsetw(save, erase, logo_lines * new_cols * 2);
  			r = q - step;
  			for (cnt = 0; cnt < logo_lines; cnt++, r += i)
  				scr_memcpyw(save + cnt * new_cols, r, 2 * i);
  			r = q;
  		}
  	}
  	if (r == q) {
  		/* We can scroll screen down */
  		r = q - step - cols;
  		for (cnt = rows - logo_lines; cnt > 0; cnt--) {
  			scr_memcpyw(r + step, r, vc->vc_size_row);
  			r -= cols;
  		}
  		if (!save) {
  			int lines;
  			if (vc->vc_y + logo_lines >= rows)
  				lines = rows - vc->vc_y - 1;
  			else
  				lines = logo_lines;
  			vc->vc_y += lines;
  			vc->vc_pos += lines * vc->vc_size_row;
  		}
  	}
  	scr_memsetw((unsigned short *) vc->vc_origin,
  		    erase,
  		    vc->vc_size_row * logo_lines);
  
  	if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
  		fbcon_clear_margins(vc, 0);
  		update_screen(vc);
  	}
  
  	if (save) {
  		q = (unsigned short *) (vc->vc_origin +
  					vc->vc_size_row *
  					rows);
  		scr_memcpyw(q, save, logo_lines * new_cols * 2);
  		vc->vc_y += logo_lines;
  		vc->vc_pos += logo_lines * vc->vc_size_row;
  		kfree(save);
  	}
  
  	if (logo_lines > vc->vc_bottom) {
  		logo_shown = FBCON_LOGO_CANSHOW;
  		printk(KERN_INFO
  		       "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
  	} else if (logo_shown != FBCON_LOGO_DONTSHOW) {
  		logo_shown = FBCON_LOGO_DRAW;
  		vc->vc_top = logo_lines;
  	}
  }
  #endif /* MODULE */
  
  #ifdef CONFIG_FB_TILEBLITTING
  static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	ops->p = &fb_display[vc->vc_num];
  
  	if ((info->flags & FBINFO_MISC_TILEBLITTING))
  		fbcon_set_tileops(vc, info);
  	else {
  		fbcon_set_rotation(info);
  		fbcon_set_bitops(ops);
  	}
  }
  
  static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
  {
  	int err = 0;
  
  	if (info->flags & FBINFO_MISC_TILEBLITTING &&
  	    info->tileops->fb_get_tilemax(info) < charcount)
  		err = 1;
  
  	return err;
  }
  #else
  static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	info->flags &= ~FBINFO_MISC_TILEBLITTING;
  	ops->p = &fb_display[vc->vc_num];
  	fbcon_set_rotation(info);
  	fbcon_set_bitops(ops);
  }
  
  static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
  {
  	return 0;
  }
  
  #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 = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
  		if (!ops)
  			err = -ENOMEM;
  	}
  
  	if (!err) {
  		info->fbcon_par = ops;
  
  		if (vc)
  			set_blitting_type(vc, info);
  	}
  
  	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) {
  		fbcon_del_cursor_timer(oldinfo);
  		kfree(ops->cursor_state.mask);
  		kfree(ops->cursor_data);
  		kfree(ops->fontbuffer);
  		kfree(oldinfo->fbcon_par);
  		oldinfo->fbcon_par = NULL;
  		module_put(oldinfo->fbops->owner);
  		/*
  		  If oldinfo and newinfo are driving the same hardware,
  		  the fb_release() method of oldinfo may attempt to
  		  restore the hardware state.  This will leave the
  		  newinfo in an undefined state. Thus, a call to
  		  fb_set_par() may be needed for the newinfo.
  		*/
  		if (newinfo->fbops->fb_set_par)
  			newinfo->fbops->fb_set_par(newinfo);
  	}
  
  	return err;
  }
  
  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 && !(ops->flags & FBCON_FLAGS_INIT))
  		info->fbops->fb_set_par(info);
  
  	ops->flags |= FBCON_FLAGS_INIT;
  	ops->graphics = 0;
  	fbcon_set_disp(info, &info->var, 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);
  	}
  
  	update_screen(vc_cons[fg_console].d);
  }
  
  /**
   *	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 || fbcon_has_exited)
  		return -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)
   			fbcon_add_cursor_timer(info);
   		con2fb_map_boot[unit] = newidx;
   		con2fb_init_display(vc, info, unit, show_logo);
  	}
  
  	if (!search_fb_in_map(info_idx))
  		info_idx = newidx;
  
  	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->rotate = var->rotate;
  	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;
  	var->rotate = disp->rotate;
  }
  
  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;
  	const 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 = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
  	if (!ops) {
  		module_put(owner);
  		return NULL;
  	}
  
  	ops->currcon = -1;
  	ops->graphics = 1;
  	ops->cur_rotate = -1;
  	info->fbcon_par = ops;
  	p->con_rotate = rotate;
  	set_blitting_type(vc, info);
  
  	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,
  						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 */
  	}
  
  	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);
  
  	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 */
  
  	fbcon_add_cursor_timer(info);
  	fbcon_has_exited = 0;
  	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 fbcon_ops *ops;
  	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 logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
  	int cap;
  
  	if (info_idx == -1 || info == NULL)
  	    return;
  
  	cap = info->flags;
  
  	if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
  	    (info->fix.type == FB_TYPE_TEXT))
  		logo = 0;
  
  	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 = rotate;
  	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;
  
  	/* 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) {
  				n = softback_in;
  				softback_lines = 0;
  			}
  		} else if (softback_curr <= softback_in && n > softback_in) {
  			n = softback_in;
  			softback_lines = 0;
  		}
  	}
  	if (n == softback_curr)
  		return;
  	softback_curr = n;
  	s = (u16 *) softback_curr;
  	if (s == (u16 *) softback_in)
  		s = (u16 *) vc->vc_origin;
  	while (count--) {
  		unsigned short *start;
  		unsigned short *le;
  		unsigned short c;
  		int x = 0;
  		unsigned short attr = 1;
  
  		start = s;
  		le = advance_row(s, 1);
  		do {
  			c = scr_readw(s);
  			if (attr != (c & 0xff00)) {
  				attr = c & 0xff00;
  				if (s > start) {
  					fbcon_putcs(vc, start, s - start,
  						    line, x);
  					x += s - start;
  					start = s;
  				}
  			}
  			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++;
  				}
  			}
  			s++;
  			d++;
  		} while (s < le);
  		if (s > start)
  			fbcon_putcs(vc, start, s - start, line, x);
  		line++;
  		if (d == (u16 *) softback_end)
  			d = (u16 *) softback_buf;
  		if (d == (u16 *) softback_in)
  			d = (u16 *) vc->vc_origin;
  		if (s == (u16 *) softback_end)
  			s = (u16 *) softback_buf;
  		if (s == (u16 *) softback_in)
  			s = (u16 *) vc->vc_origin;
  	}
  }
  
  static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
  			      int line, int count, int dy)
  {
  	unsigned short *s = (unsigned short *)
  		(vc->vc_origin + vc->vc_size_row * line);
  
  	while (count--) {
  		unsigned short *start = s;
  		unsigned short *le = advance_row(s, 1);
  		unsigned short c;
  		int x = 0;
  		unsigned short attr = 1;
  
  		do {
  			c = scr_readw(s);
  			if (attr != (c & 0xff00)) {
  				attr = c & 0xff00;
  				if (s > start) {
  					fbcon_putcs(vc, start, s - start,
  						    dy, x);
  					x += s - start;
  					start = s;
  				}
  			}
  			console_conditional_schedule();
  			s++;
  		} while (s < le);
  		if (s > start)
  			fbcon_putcs(vc, start, s - start, dy, x);
  		console_conditional_schedule();
  		dy++;
  	}
  }
  
  static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
  			struct display *p, int line, int count, int ycount)
  {
  	int offset = ycount * vc->vc_cols;
  	unsigned short *d = (unsigned short *)
  	    (vc->vc_origin + vc->vc_size_row * line);
  	unsigned short *s = d + offset;
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	while (count--) {
  		unsigned short *start = s;
  		unsigned short *le = advance_row(s, 1);
  		unsigned short c;
  		int x = 0;
  
  		do {
  			c = scr_readw(s);
  
  			if (c == scr_readw(d)) {
  				if (s > start) {
  					ops->bmove(vc, info, line + ycount, x,
  						   line, x, 1, s-start);
  					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)
  			ops->bmove(vc, info, line + ycount, x, line, x, 1,
  				   s-start);
  		console_conditional_schedule();
  		if (ycount > 0)
  			line++;
  		else {
  			line--;
  			/* NOTE: We subtract two lines from these pointers */
  			s -= vc->vc_size_row;
  			d -= vc->vc_size_row;
  		}
  	}
  }
  
  static void fbcon_redraw(struct vc_data *vc, struct display *p,
  			 int line, int count, int offset)
  {
  	unsigned short *d = (unsigned short *)
  	    (vc->vc_origin + vc->vc_size_row * line);
  	unsigned short *s = d + offset;
  
  	while (count--) {
  		unsigned short *start = s;
  		unsigned short *le = advance_row(s, 1);
  		unsigned short c;
  		int x = 0;
  		unsigned short attr = 1;
  
  		do {
  			c = scr_readw(s);
  			if (attr != (c & 0xff00)) {
  				attr = c & 0xff00;
  				if (s > start) {
  					fbcon_putcs(vc, start, s - start,
  						    line, x);
  					x += s - start;
  					start = s;
  				}
  			}
  			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];
  	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:
  			fbcon_redraw_blit(vc, info, p, t, b - t - count,
  				     count);
  			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 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,
  							  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;
  		if (logo_shown >= 0)
  			goto redraw_down;
  		switch (p->scrollmode) {
  		case SCROLL_MOVE:
  			fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
  				     -count);
  			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;
  			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)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  	int fh = vc->vc_font.height;
  	int cap = info->flags;
  	u16 t = 0;
  	int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
  				  info->fix.xpanstep);
  	int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
  	int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
  	int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
  				   info->var.xres_virtual);
  	int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
  		divides(ypan, vc->vc_font.height) && vyres > yres;
  	int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
  		divides(ywrap, vc->vc_font.height) &&
  		divides(vc->vc_font.height, vyres) &&
  		divides(vc->vc_font.height, yres);
  	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 = vyres/fh;
  	if (yres > (fh * (vc->vc_rows + 1)))
  		p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
  	if ((yres % fh) && (vyres % fh < 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, unsigned int user)
  {
  	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];
  	struct fb_var_screeninfo var = info->var;
  	int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
  
  	virt_w = FBCON_SWAP(ops->rotate, width, height);
  	virt_h = FBCON_SWAP(ops->rotate, height, width);
  	virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
  				 vc->vc_font.height);
  	virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
  				 vc->vc_font.width);
  	var.xres = virt_w * virt_fw;
  	var.yres = virt_h * virt_fh;
  	x_diff = info->var.xres - var.xres;
  	y_diff = info->var.yres - var.yres;
  	if (x_diff < 0 || x_diff > virt_fw ||
  	    y_diff < 0 || y_diff > virt_fh) {
  		const 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;
  		display_to_var(&var, p);
  		fb_videomode_to_var(&var, mode);
  
  		if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
  			return -EINVAL;
  
  		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);
  		}
  		var_to_display(p, &info->var, info);
  		ops->var = info->var;
  	}
  	updatescrollmode(p, info, vc);
  	return 0;
  }
  
  static int fbcon_switch(struct vc_data *vc)
  {
  	struct fb_info *info, *old_info = NULL;
  	struct fbcon_ops *ops;
  	struct display *p = &fb_display[vc->vc_num];
  	struct fb_var_screeninfo var;
  	int i, prev_console, charcnt = 256;
  
  	info = registered_fb[con2fb_map[vc->vc_num]];
  	ops = info->fbcon_par;
  
  	if (softback_top) {
  		if (softback_lines)
  			fbcon_set_origin(vc);
  		softback_top = softback_curr = softback_in = softback_buf;
  		softback_lines = 0;
  		fbcon_update_softback(vc);
  	}
  
  	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 = ops->currcon;
  	if (prev_console != -1)
  		old_info = registered_fb[con2fb_map[prev_console]];
  	/*
  	 * 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 *o = registered_fb[i]->fbcon_par;
  
  			o->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;
  	var.yoffset = info->var.yoffset;
  	var.xoffset = info->var.xoffset;
  	var.vmode = info->var.vmode;
  	fb_set_var(info, &var);
  	ops->var = info->var;
  
  	if (old_info != NULL && (old_info != info ||
  				 info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
  		if (info->fbops->fb_set_par)
  			info->fbops->fb_set_par(info);
  
  		if (old_info != info)
  			fbcon_del_cursor_timer(old_info);
  	}
  
  	if (fbcon_is_inactive(vc, info) ||
  	    ops->blank_state != FB_BLANK_UNBLANK)
  		fbcon_del_cursor_timer(info);
  	else
  		fbcon_add_cursor_timer(info);
  
  	set_blitting_type(vc, info);
  	ops->cursor_reset = 1;
  
  	if (ops->rotate_font && ops->rotate_font(info, vc)) {
  		ops->rotate = FB_ROTATE_UR;
  		set_blitting_type(vc, info);
  	}
  
  	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 (p->userfont)
  		charcnt = FNTCHARCNT(vc->vc_font.data);
  
  	if (charcnt > 256)
  		vc->vc_complement_mask <<= 1;
  
  	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;
  	}
  
  	scrollback_max = 0;
  	scrollback_current = 0;
  
  	if (!fbcon_is_inactive(vc, info)) {
  	    ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
  	    ops->update_start(info);
  	}
  
  	fbcon_set_palette(vc, color_table); 	
  	fbcon_clear_margins(vc, 0);
  
  	if (logo_shown == FBCON_LOGO_DRAW) {
  
  		logo_shown = fg_console;
  		/* This is protected above by initmem_freed */
  		fb_show_logo(info, ops->rotate);
  		update_region(vc,
  			      vc->vc_origin + vc->vc_size_row * vc->vc_top,
  			      vc->vc_size_row * (vc->vc_bottom -
  						 vc->vc_top) / 2);
  		return 0;
  	}
  	return 1;
  }
  
  static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
  				int blank)
  {
  	struct fb_event event;
  
  	if (blank) {
  		unsigned short charmask = vc->vc_hi_font_mask ?
  			0x1ff : 0xff;
  		unsigned short oldc;
  
  		oldc = vc->vc_video_erase_char;
  		vc->vc_video_erase_char &= charmask;
  		fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
  		vc->vc_video_erase_char = oldc;
  	}
  
  
  	event.info = info;
  	event.data = &blank;
  	fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
  }
  
  static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
  {
  	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	if (mode_switch) {
  		struct fb_var_screeninfo var = info->var;
  
  		ops->graphics = 1;
  
  		if (!blank) {
  			if (info->fbops->fb_save_state)
  				info->fbops->fb_save_state(info);
  			var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
  			fb_set_var(info, &var);
  			ops->graphics = 0;
  			ops->var = info->var;
  		} else if (info->fbops->fb_restore_state)
  			info->fbops->fb_restore_state(info);
  	}
  
   	if (!fbcon_is_inactive(vc, info)) {
  		if (ops->blank_state != blank) {
  			ops->blank_state = blank;
  			fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
  			ops->cursor_flash = (!blank);
  
  			if (fb_blank(info, blank))
  				fbcon_generic_blank(vc, info, blank);
  		}
  
  		if (!blank)
  			update_screen(vc);
  	}
  
  	if (mode_switch || fbcon_is_inactive(vc, info) ||
  	    ops->blank_state != FB_BLANK_UNBLANK)
  		fbcon_del_cursor_timer(info);
  	else
  		fbcon_add_cursor_timer(info);
  
  	return 0;
  }
  
  static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
  {
  	u8 *fontdata = vc->vc_font.data;
  	u8 *data = font->data;
  	int i, j;
  
  	font->width = vc->vc_font.width;
  	font->height = vc->vc_font.height;
  	font->charcount = vc->vc_hi_font_mask ? 512 : 256;
  	if (!font->data)
  		return 0;
  
  	if (font->width <= 8) {
  		j = vc->vc_font.height;
  		for (i = 0; i < font->charcount; i++) {
  			memcpy(data, fontdata, j);
  			memset(data + j, 0, 32 - j);
  			data += 32;
  			fontdata += j;
  		}
  	} else if (font->width <= 16) {
  		j = vc->vc_font.height * 2;
  		for (i = 0; i < font->charcount; i++) {
  			memcpy(data, fontdata, j);
  			memset(data + j, 0, 64 - j);
  			data += 64;
  			fontdata += j;
  		}
  	} else if (font->width <= 24) {
  		for (i = 0; i < font->charcount; i++) {
  			for (j = 0; j < vc->vc_font.height; j++) {
  				*data++ = fontdata[0];
  				*data++ = fontdata[1];
  				*data++ = fontdata[2];
  				fontdata += sizeof(u32);
  			}
  			memset(data, 0, 3 * (32 - j));
  			data += 3 * (32 - j);
  		}
  	} else {
  		j = vc->vc_font.height * 4;
  		for (i = 0; i < font->charcount; i++) {
  			memcpy(data, fontdata, j);
  			memset(data + j, 0, 128 - j);
  			data += 128;
  			fontdata += j;
  		}
  	}
  	return 0;
  }
  
  static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
  			     const u8 * data, int userfont)
  {
  	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];
  	int resize;
  	int cnt;
  	char *old_data = NULL;
  
  	if (CON_IS_VISIBLE(vc) && softback_lines)
  		fbcon_set_origin(vc);
  
  	resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
  	if (p->userfont)
  		old_data = vc->vc_font.data;
  	if (userfont)
  		cnt = FNTCHARCNT(data);
  	else
  		cnt = 256;
  	vc->vc_font.data = (void *)(p->fontdata = data);
  	if ((p->userfont = userfont))
  		REFCOUNT(data)++;
  	vc->vc_font.width = w;
  	vc->vc_font.height = h;
  	if (vc->vc_hi_font_mask && cnt == 256) {
  		vc->vc_hi_font_mask = 0;
  		if (vc->vc_can_do_color) {
  			vc->vc_complement_mask >>= 1;
  			vc->vc_s_complement_mask >>= 1;
  		}
  			
  		/* ++Edmund: reorder the attribute bits */
  		if (vc->vc_can_do_color) {
  			unsigned short *cp =
  			    (unsigned short *) vc->vc_origin;
  			int count = vc->vc_screenbuf_size / 2;
  			unsigned short c;
  			for (; count > 0; count--, cp++) {
  				c = scr_readw(cp);
  				scr_writew(((c & 0xfe00) >> 1) |
  					   (c & 0xff), cp);
  			}
  			c = vc->vc_video_erase_char;
  			vc->vc_video_erase_char =
  			    ((c & 0xfe00) >> 1) | (c & 0xff);
  			vc->vc_attr >>= 1;
  		}
  	} else if (!vc->vc_hi_font_mask && cnt == 512) {
  		vc->vc_hi_font_mask = 0x100;
  		if (vc->vc_can_do_color) {
  			vc->vc_complement_mask <<= 1;
  			vc->vc_s_complement_mask <<= 1;
  		}
  			
  		/* ++Edmund: reorder the attribute bits */
  		{
  			unsigned short *cp =
  			    (unsigned short *) vc->vc_origin;
  			int count = vc->vc_screenbuf_size / 2;
  			unsigned short c;
  			for (; count > 0; count--, cp++) {
  				unsigned short newc;
  				c = scr_readw(cp);
  				if (vc->vc_can_do_color)
  					newc =
  					    ((c & 0xff00) << 1) | (c &
  								   0xff);
  				else
  					newc = c & ~0x100;
  				scr_writew(newc, cp);
  			}
  			c = vc->vc_video_erase_char;
  			if (vc->vc_can_do_color) {
  				vc->vc_video_erase_char =
  				    ((c & 0xff00) << 1) | (c & 0xff);
  				vc->vc_attr <<= 1;
  			} else
  				vc->vc_video_erase_char = c & ~0x100;
  		}
  
  	}
  
  	if (resize) {
  		int cols, rows;
  
  		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
  		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
  		cols /= w;
  		rows /= h;
  		vc_resize(vc, cols, rows);
  		if (CON_IS_VISIBLE(vc) && softback_buf)
  			fbcon_update_softback(vc);
  	} else if (CON_IS_VISIBLE(vc)
  		   && vc->vc_mode == KD_TEXT) {
  		fbcon_clear_margins(vc, 0);
  		update_screen(vc);
  	}
  
  	if (old_data && (--REFCOUNT(old_data) == 0))
  		kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
  	return 0;
  }
  
  static int fbcon_copy_font(struct vc_data *vc, int con)
  {
  	struct display *od = &fb_display[con];
  	struct console_font *f = &vc->vc_font;
  
  	if (od->fontdata == f->data)
  		return 0;	/* already the same font... */
  	return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
  }
  
  /*
   *  User asked to set font; we are guaranteed that
   *	a) width and height are in range 1..32
   *	b) charcount does not exceed 512
   *  but lets not assume that, since someone might someday want to use larger
   *  fonts. And charcount of 512 is small for unicode support.
   *
   *  However, user space gives the font in 32 rows , regardless of
   *  actual font height. So a new API is needed if support for larger fonts
   *  is ever implemented.
   */
  
  static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
  {
  	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
  	unsigned charcount = font->charcount;
  	int w = font->width;
  	int h = font->height;
  	int size;
  	int i, csum;
  	u8 *new_data, *data = font->data;
  	int pitch = (font->width+7) >> 3;
  
  	/* Is there a reason why fbconsole couldn't handle any charcount >256?
  	 * If not this check should be changed to charcount < 256 */
  	if (charcount != 256 && charcount != 512)
  		return -EINVAL;
  
  	/* Make sure drawing engine can handle the font */
  	if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
  	    !(info->pixmap.blit_y & (1 << (font->height - 1))))
  		return -EINVAL;
  
  	/* Make sure driver can handle the font length */
  	if (fbcon_invalid_charcount(info, charcount))
  		return -EINVAL;
  
  	size = h * pitch * charcount;
  
  	new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
  
  	if (!new_data)
  		return -ENOMEM;
  
  	new_data += FONT_EXTRA_WORDS * sizeof(int);
  	FNTSIZE(new_data) = size;
  	FNTCHARCNT(new_data) = charcount;
  	REFCOUNT(new_data) = 0;	/* usage counter */
  	for (i=0; i< charcount; i++) {
  		memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
  	}
  
  	/* Since linux has a nice crc32 function use it for counting font
  	 * checksums. */
  	csum = crc32(0, new_data, size);
  
  	FNTSUM(new_data) = csum;
  	/* Check if the same font is on some other console already */
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		struct vc_data *tmp = vc_cons[i].d;
  		
  		if (fb_display[i].userfont &&
  		    fb_display[i].fontdata &&
  		    FNTSUM(fb_display[i].fontdata) == csum &&
  		    FNTSIZE(fb_display[i].fontdata) == size &&
  		    tmp->vc_font.width == w &&
  		    !memcmp(fb_display[i].fontdata, new_data, size)) {
  			kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
  			new_data = (u8 *)fb_display[i].fontdata;
  			break;
  		}
  	}
  	return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
  }
  
  static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
  {
  	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
  	const struct font_desc *f;
  
  	if (!name)
  		f = get_default_font(info->var.xres, info->var.yres,
  				     info->pixmap.blit_x, info->pixmap.blit_y);
  	else if (!(f = find_font(name)))
  		return -ENOENT;
  
  	font->width = f->width;
  	font->height = f->height;
  	return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
  }
  
  static u16 palette_red[16];
  static u16 palette_green[16];
  static u16 palette_blue[16];
  
  static struct fb_cmap palette_cmap = {
  	0, 16, palette_red, palette_green, palette_blue, NULL
  };
  
  static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
  {
  	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
  	int i, j, k, depth;
  	u8 val;
  
  	if (fbcon_is_inactive(vc, info))
  		return -EINVAL;
  
  	if (!CON_IS_VISIBLE(vc))
  		return 0;
  
  	depth = fb_get_color_depth(&info->var, &info->fix);
  	if (depth > 3) {
  		for (i = j = 0; i < 16; i++) {
  			k = table[i];
  			val = vc->vc_palette[j++];
  			palette_red[k] = (val << 8) | val;
  			val = vc->vc_palette[j++];
  			palette_green[k] = (val << 8) | val;
  			val = vc->vc_palette[j++];
  			palette_blue[k] = (val << 8) | val;
  		}
  		palette_cmap.len = 16;
  		palette_cmap.start = 0;
  	/*
  	 * If framebuffer is capable of less than 16 colors,
  	 * use default palette of fbcon.
  	 */
  	} else
  		fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
  
  	return fb_set_cmap(&palette_cmap, info);
  }
  
  static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
  {
  	unsigned long p;
  	int line;
  	
  	if (vc->vc_num != fg_console || !softback_lines)
  		return (u16 *) (vc->vc_origin + offset);
  	line = offset / vc->vc_size_row;
  	if (line >= softback_lines)
  		return (u16 *) (vc->vc_origin + offset -
  				softback_lines * vc->vc_size_row);
  	p = softback_curr + offset;
  	if (p >= softback_end)
  		p += softback_buf - softback_end;
  	return (u16 *) p;
  }
  
  static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
  				 int *px, int *py)
  {
  	unsigned long ret;
  	int x, y;
  
  	if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
  		unsigned long offset = (pos - vc->vc_origin) / 2;
  
  		x = offset % vc->vc_cols;
  		y = offset / vc->vc_cols;
  		if (vc->vc_num == fg_console)
  			y += softback_lines;
  		ret = pos + (vc->vc_cols - x) * 2;
  	} else if (vc->vc_num == fg_console && softback_lines) {
  		unsigned long offset = pos - softback_curr;
  
  		if (pos < softback_curr)
  			offset += softback_end - softback_buf;
  		offset /= 2;
  		x = offset % vc->vc_cols;
  		y = offset / vc->vc_cols;
  		ret = pos + (vc->vc_cols - x) * 2;
  		if (ret == softback_end)
  			ret = softback_buf;
  		if (ret == softback_in)
  			ret = vc->vc_origin;
  	} else {
  		/* Should not happen */
  		x = y = 0;
  		ret = vc->vc_origin;
  	}
  	if (px)
  		*px = x;
  	if (py)
  		*py = y;
  	return ret;
  }
  
  /* As we might be inside of softback, we may work with non-contiguous buffer,
     that's why we have to use a separate routine. */
  static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
  {
  	while (cnt--) {
  		u16 a = scr_readw(p);
  		if (!vc->vc_can_do_color)
  			a ^= 0x0800;
  		else if (vc->vc_hi_font_mask == 0x100)
  			a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
  			    (((a) & 0x0e00) << 4);
  		else
  			a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
  			    (((a) & 0x0700) << 4);
  		scr_writew(a, p++);
  		if (p == (u16 *) softback_end)
  			p = (u16 *) softback_buf;
  		if (p == (u16 *) softback_in)
  			p = (u16 *) vc->vc_origin;
  	}
  }
  
  static int fbcon_scrolldelta(struct vc_data *vc, int lines)
  {
  	struct fb_info *info = registered_fb[con2fb_map[fg_console]];
  	struct fbcon_ops *ops = info->fbcon_par;
  	struct display *p = &fb_display[fg_console];
  	int offset, limit, scrollback_old;
  
  	if (softback_top) {
  		if (vc->vc_num != fg_console)
  			return 0;
  		if (vc->vc_mode != KD_TEXT || !lines)
  			return 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;
  			if (logo_shown == vc->vc_num) {
  				unsigned long p, q;
  				int i;
  
  				p = softback_in;
  				q = vc->vc_origin +
  				    logo_lines * vc->vc_size_row;
  				for (i = 0; i < logo_lines; i++) {
  					if (p == softback_top)
  						break;
  					if (p == softback_buf)
  						p = softback_end;
  					p -= vc->vc_size_row;
  					q -= vc->vc_size_row;
  					scr_memcpyw((u16 *) q, (u16 *) p,
  						    vc->vc_size_row);
  				}
  				softback_in = softback_curr = p;
  				update_region(vc, vc->vc_origin,
  					      logo_lines * vc->vc_cols);
  			}
  			logo_shown = FBCON_LOGO_CANSHOW;
  		}
  		fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
  		fbcon_redraw_softback(vc, p, lines);
  		fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
  		return 0;
  	}
  
  	if (!scrollback_phys_max)
  		return -ENOSYS;
  
  	scrollback_old = scrollback_current;
  	scrollback_current -= lines;
  	if (scrollback_current < 0)
  		scrollback_current = 0;
  	else if (scrollback_current > scrollback_max)
  		scrollback_current = scrollback_max;
  	if (scrollback_current == scrollback_old)
  		return 0;
  
  	if (fbcon_is_inactive(vc, info))
  		return 0;
  
  	fbcon_cursor(vc, CM_ERASE);
  
  	offset = p->yscroll - scrollback_current;
  	limit = p->vrows;
  	switch (p->scrollmode) {
  	case SCROLL_WRAP_MOVE:
  		info->var.vmode |= FB_VMODE_YWRAP;
  		break;
  	case SCROLL_PAN_MOVE:
  	case SCROLL_PAN_REDRAW:
  		limit -= vc->vc_rows;
  		info->var.vmode &= ~FB_VMODE_YWRAP;
  		break;
  	}
  	if (offset < 0)
  		offset += limit;
  	else if (offset >= limit)
  		offset -= limit;
  
  	ops->var.xoffset = 0;
  	ops->var.yoffset = offset * vc->vc_font.height;
  	ops->update_start(info);
  
  	if (!scrollback_current)
  		fbcon_cursor(vc, CM_DRAW);
  	return 0;
  }
  
  static int fbcon_set_origin(struct vc_data *vc)
  {
  	if (softback_lines)
  		fbcon_scrolldelta(vc, softback_lines);
  	return 0;
  }
  
  static void fbcon_suspended(struct fb_info *info)
  {
  	struct vc_data *vc = NULL;
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	if (!ops || ops->currcon < 0)
  		return;
  	vc = vc_cons[ops->currcon].d;
  
  	/* Clear cursor, restore saved data */
  	fbcon_cursor(vc, CM_ERASE);
  }
  
  static void fbcon_resumed(struct fb_info *info)
  {
  	struct vc_data *vc;
  	struct fbcon_ops *ops = info->fbcon_par;
  
  	if (!ops || ops->currcon < 0)
  		return;
  	vc = vc_cons[ops->currcon].d;
  
  	update_screen(vc);
  }
  
  static void fbcon_modechanged(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  	struct vc_data *vc;
  	struct display *p;
  	int rows, cols;
  
  	if (!ops || ops->currcon < 0)
  		return;
  	vc = vc_cons[ops->currcon].d;
  	if (vc->vc_mode != KD_TEXT ||
  	    registered_fb[con2fb_map[ops->currcon]] != info)
  		return;
  
  	p = &fb_display[vc->vc_num];
  	set_blitting_type(vc, info);
  
  	if (CON_IS_VISIBLE(vc)) {
  		var_to_display(p, &info->var, info);
  		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);
  		updatescrollmode(p, info, vc);
  		scrollback_max = 0;
  		scrollback_current = 0;
  
  		if (!fbcon_is_inactive(vc, info)) {
  		    ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
  		    ops->update_start(info);
  		}
  
  		fbcon_set_palette(vc, color_table);
  		update_screen(vc);
  		if (softback_buf)
  			fbcon_update_softback(vc);
  	}
  }
  
  static void fbcon_set_all_vcs(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  	struct vc_data *vc;
  	struct display *p;
  	int i, rows, cols, fg = -1;
  
  	if (!ops || ops->currcon < 0)
  		return;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		vc = vc_cons[i].d;
  		if (!vc || vc->vc_mode != KD_TEXT ||
  		    registered_fb[con2fb_map[i]] != info)
  			continue;
  
  		if (CON_IS_VISIBLE(vc)) {
  			fg = i;
  			continue;
  		}
  
  		p = &fb_display[vc->vc_num];
  		set_blitting_type(vc, info);
  		var_to_display(p, &info->var, info);
  		cols = FBCON_SWAP(p->rotate, info->var.xres, info->var.yres);
  		rows = FBCON_SWAP(p->rotate, info->var.yres, info->var.xres);
  		cols /= vc->vc_font.width;
  		rows /= vc->vc_font.height;
  		vc_resize(vc, cols, rows);
  	}
  
  	if (fg != -1)
  		fbcon_modechanged(info);
  }
  
  static int fbcon_mode_deleted(struct fb_info *info,
  			      struct fb_videomode *mode)
  {
  	struct fb_info *fb_info;
  	struct display *p;
  	int i, j, found = 0;
  
  	/* before deletion, ensure that mode is not in use */
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		j = con2fb_map[i];
  		if (j == -1)
  			continue;
  		fb_info = registered_fb[j];
  		if (fb_info != info)
  			continue;
  		p = &fb_display[i];
  		if (!p || !p->mode)
  			continue;
  		if (fb_mode_is_equal(p->mode, mode)) {
  			found = 1;
  			break;
  		}
  	}
  	return found;
  }
  
  #ifdef CONFIG_VT_HW_CONSOLE_BINDING
  static int fbcon_unbind(void)
  {
  	int ret;
  
  	ret = unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
  				fbcon_is_default);
  	return ret;
  }
  #else
  static inline int fbcon_unbind(void)
  {
  	return -EINVAL;
  }
  #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
  
  static int fbcon_fb_unbind(int idx)
  {
  	int i, new_idx = -1, ret = 0;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		if (con2fb_map[i] != idx &&
  		    con2fb_map[i] != -1) {
  			new_idx = i;
  			break;
  		}
  	}
  
  	if (new_idx != -1) {
  		for (i = first_fb_vc; i <= last_fb_vc; i++) {
  			if (con2fb_map[i] == idx)
  				set_con2fb_map(i, new_idx, 0);
  		}
  	} else
  		ret = fbcon_unbind();
  
  	return ret;
  }
  
  static int fbcon_fb_unregistered(struct fb_info *info)
  {
  	int i, idx = info->node;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		if (con2fb_map[i] == idx)
  			con2fb_map[i] = -1;
  	}
  
  	if (idx == info_idx) {
  		info_idx = -1;
  
  		for (i = 0; i < FB_MAX; i++) {
  			if (registered_fb[i] != NULL) {
  				info_idx = i;
  				break;
  			}
  		}
  	}
  
  	if (info_idx != -1) {
  		for (i = first_fb_vc; i <= last_fb_vc; i++) {
  			if (con2fb_map[i] == -1)
  				con2fb_map[i] = info_idx;
  		}
  	}
  
  	if (!num_registered_fb)
  		unregister_con_driver(&fb_con);
  
  
  	if (primary_device == idx)
  		primary_device = -1;
  
  	return 0;
  }
  
  #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
  static void fbcon_select_primary(struct fb_info *info)
  {
  	if (!map_override && primary_device == -1 &&
  	    fb_is_primary_device(info)) {
  		int i;
  
  		printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
  		       info->fix.id, info->node);
  		primary_device = info->node;
  
  		for (i = first_fb_vc; i <= last_fb_vc; i++)
  			con2fb_map_boot[i] = primary_device;
  
  		if (con_is_bound(&fb_con)) {
  			printk(KERN_INFO "fbcon: Remapping primary device, "
  			       "fb%i, to tty %i-%i\n", info->node,
  			       first_fb_vc + 1, last_fb_vc + 1);
  			info_idx = primary_device;
  		}
  	}
  
  }
  #else
  static inline void fbcon_select_primary(struct fb_info *info)
  {
  	return;
  }
  #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
  
  static int fbcon_fb_registered(struct fb_info *info)
  {
  	int ret = 0, i, idx = info->node;
  
  	fbcon_select_primary(info);
  
  	if (info_idx == -1) {
  		for (i = first_fb_vc; i <= last_fb_vc; i++) {
  			if (con2fb_map_boot[i] == idx) {
  				info_idx = idx;
  				break;
  			}
  		}
  
  		if (info_idx != -1)
  			ret = fbcon_takeover(1);
  	} else {
  		for (i = first_fb_vc; i <= last_fb_vc; i++) {
  			if (con2fb_map_boot[i] == idx)
  				set_con2fb_map(i, idx, 0);
  		}
  	}
  
  	return ret;
  }
  
  static void fbcon_fb_blanked(struct fb_info *info, int blank)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
  	struct vc_data *vc;
  
  	if (!ops || ops->currcon < 0)
  		return;
  
  	vc = vc_cons[ops->currcon].d;
  	if (vc->vc_mode != KD_TEXT ||
  			registered_fb[con2fb_map[ops->currcon]] != info)
  		return;
  
  	if (CON_IS_VISIBLE(vc)) {
  		if (blank)
  			do_blank_screen(0);
  		else
  			do_unblank_screen(0);
  	}
  	ops->blank_state = blank;
  }
  
  static void fbcon_new_modelist(struct fb_info *info)
  {
  	int i;
  	struct vc_data *vc;
  	struct fb_var_screeninfo var;
  	const struct fb_videomode *mode;
  
  	for (i = first_fb_vc; i <= last_fb_vc; i++) {
  		if (registered_fb[con2fb_map[i]] != info)
  			continue;
  		if (!fb_display[i].mode)
  			continue;
  		vc = vc_cons[i].d;
  		display_to_var(&var, &fb_display[i]);
  		mode = fb_find_nearest_mode(fb_display[i].mode,
  					    &info->modelist);
  		fb_videomode_to_var(&var, mode);
  		fbcon_set_disp(info, &var, vc->vc_num);
  	}
  }
  
  static void fbcon_get_requirement(struct fb_info *info,
  				  struct fb_blit_caps *caps)
  {
  	struct vc_data *vc;
  	struct display *p;
  
  	if (caps->flags) {
  		int i, charcnt;
  
  		for (i = first_fb_vc; i <= last_fb_vc; i++) {
  			vc = vc_cons[i].d;
  			if (vc && vc->vc_mode == KD_TEXT &&
  			    info->node == con2fb_map[i]) {
  				p = &fb_display[i];
  				caps->x |= 1 << (vc->vc_font.width - 1);
  				caps->y |= 1 << (vc->vc_font.height - 1);
  				charcnt = (p->userfont) ?
  					FNTCHARCNT(p->fontdata) : 256;
  				if (caps->len < charcnt)
  					caps->len = charcnt;
  			}
  		}
  	} else {
  		vc = vc_cons[fg_console].d;
  
  		if (vc && vc->vc_mode == KD_TEXT &&
  		    info->node == con2fb_map[fg_console]) {
  			p = &fb_display[fg_console];
  			caps->x = 1 << (vc->vc_font.width - 1);
  			caps->y = 1 << (vc->vc_font.height - 1);
  			caps->len = (p->userfont) ?
  				FNTCHARCNT(p->fontdata) : 256;
  		}
  	}
  }
  
  static int fbcon_event_notify(struct notifier_block *self, 
  			      unsigned long action, void *data)
  {
  	struct fb_event *event = data;
  	struct fb_info *info = event->info;
  	struct fb_videomode *mode;
  	struct fb_con2fbmap *con2fb;
  	struct fb_blit_caps *caps;
  	int ret = 0;
  
  	/*
  	 * ignore all events except driver registration and deregistration
  	 * if fbcon is not active
  	 */
  	if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
  				  action == FB_EVENT_FB_UNREGISTERED))
  		goto done;
  
  	switch(action) {
  	case FB_EVENT_SUSPEND:
  		fbcon_suspended(info);
  		break;
  	case FB_EVENT_RESUME:
  		fbcon_resumed(info);
  		break;
  	case FB_EVENT_MODE_CHANGE:
  		fbcon_modechanged(info);
  		break;
  	case FB_EVENT_MODE_CHANGE_ALL:
  		fbcon_set_all_vcs(info);
  		break;
  	case FB_EVENT_MODE_DELETE:
  		mode = event->data;
  		ret = fbcon_mode_deleted(info, mode);
  		break;
  	case FB_EVENT_FB_UNBIND:
  		ret = fbcon_fb_unbind(info->node);
  		break;
  	case FB_EVENT_FB_REGISTERED:
  		ret = fbcon_fb_registered(info);
  		break;
  	case FB_EVENT_FB_UNREGISTERED:
  		ret = fbcon_fb_unregistered(info);
  		break;
  	case FB_EVENT_SET_CONSOLE_MAP:
  		con2fb = event->data;
  		ret = set_con2fb_map(con2fb->console - 1,
  				     con2fb->framebuffer, 1);
  		break;
  	case FB_EVENT_GET_CONSOLE_MAP:
  		con2fb = event->data;
  		con2fb->framebuffer = con2fb_map[con2fb->console - 1];
  		break;
  	case FB_EVENT_BLANK:
  		fbcon_fb_blanked(info, *(int *)event->data);
  		break;
  	case FB_EVENT_NEW_MODELIST:
  		fbcon_new_modelist(info);
  		break;
  	case FB_EVENT_GET_REQ:
  		caps = event->data;
  		fbcon_get_requirement(info, caps);
  		break;
  	}
  
  done:
  	return ret;
  }
  
  /*
   *  The console `switch' structure for the frame buffer based console
   */
  
  static const struct consw fb_con = {
  	.owner			= THIS_MODULE,
  	.con_startup 		= fbcon_startup,
  	.con_init 		= fbcon_init,
  	.con_deinit 		= fbcon_deinit,
  	.con_clear 		= fbcon_clear,
  	.con_putc 		= fbcon_putc,
  	.con_putcs 		= fbcon_putcs,
  	.con_cursor 		= fbcon_cursor,
  	.con_scroll 		= fbcon_scroll,
  	.con_bmove 		= fbcon_bmove,
  	.con_switch 		= fbcon_switch,
  	.con_blank 		= fbcon_blank,
  	.con_font_set 		= fbcon_set_font,
  	.con_font_get 		= fbcon_get_font,
  	.con_font_default	= fbcon_set_def_font,
  	.con_font_copy 		= fbcon_copy_font,
  	.con_set_palette 	= fbcon_set_palette,
  	.con_scrolldelta 	= fbcon_scrolldelta,
  	.con_set_origin 	= fbcon_set_origin,
  	.con_invert_region 	= fbcon_invert_region,
  	.con_screen_pos 	= fbcon_screen_pos,
  	.con_getxy 		= fbcon_getxy,
  	.con_resize             = fbcon_resize,
  };
  
  static struct notifier_block fbcon_event_notifier = {
  	.notifier_call	= fbcon_event_notify,
  };
  
  static ssize_t store_rotate(struct device *device,
  			    struct device_attribute *attr, const char *buf,
  			    size_t count)
  {
  	struct fb_info *info;
  	int rotate, idx;
  	char **last = NULL;
  
  	if (fbcon_has_exited)
  		return count;
  
  	acquire_console_sem();
  	idx = con2fb_map[fg_console];
  
  	if (idx == -1 || registered_fb[idx] == NULL)
  		goto err;
  
  	info = registered_fb[idx];
  	rotate = simple_strtoul(buf, last, 0);
  	fbcon_rotate(info, rotate);
  err:
  	release_console_sem();
  	return count;
  }
  
  static ssize_t store_rotate_all(struct device *device,
  				struct device_attribute *attr,const char *buf,
  				size_t count)
  {
  	struct fb_info *info;
  	int rotate, idx;
  	char **last = NULL;
  
  	if (fbcon_has_exited)
  		return count;
  
  	acquire_console_sem();
  	idx = con2fb_map[fg_console];
  
  	if (idx == -1 || registered_fb[idx] == NULL)
  		goto err;
  
  	info = registered_fb[idx];
  	rotate = simple_strtoul(buf, last, 0);
  	fbcon_rotate_all(info, rotate);
  err:
  	release_console_sem();
  	return count;
  }
  
  static ssize_t show_rotate(struct device *device,
  			   struct device_attribute *attr,char *buf)
  {
  	struct fb_info *info;
  	int rotate = 0, idx;
  
  	if (fbcon_has_exited)
  		return 0;
  
  	acquire_console_sem();
  	idx = con2fb_map[fg_console];
  
  	if (idx == -1 || registered_fb[idx] == NULL)
  		goto err;
  
  	info = registered_fb[idx];
  	rotate = fbcon_get_rotate(info);
  err:
  	release_console_sem();
  	return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
  }
  
  static ssize_t show_cursor_blink(struct device *device,
  				 struct device_attribute *attr, char *buf)
  {
  	struct fb_info *info;
  	struct fbcon_ops *ops;
  	int idx, blink = -1;
  
  	if (fbcon_has_exited)
  		return 0;
  
  	acquire_console_sem();
  	idx = con2fb_map[fg_console];
  
  	if (idx == -1 || registered_fb[idx] == NULL)
  		goto err;
  
  	info = registered_fb[idx];
  	ops = info->fbcon_par;
  
  	if (!ops)
  		goto err;
  
  	blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
  err:
  	release_console_sem();
  	return snprintf(buf, PAGE_SIZE, "%d\n", blink);
  }
  
  static ssize_t store_cursor_blink(struct device *device,
  				  struct device_attribute *attr,
  				  const char *buf, size_t count)
  {
  	struct fb_info *info;
  	int blink, idx;
  	char **last = NULL;
  
  	if (fbcon_has_exited)
  		return count;
  
  	acquire_console_sem();
  	idx = con2fb_map[fg_console];
  
  	if (idx == -1 || registered_fb[idx] == NULL)
  		goto err;
  
  	info = registered_fb[idx];
  
  	if (!info->fbcon_par)
  		goto err;
  
  	blink = simple_strtoul(buf, last, 0);
  
  	if (blink) {
  		fbcon_cursor_noblink = 0;
  		fbcon_add_cursor_timer(info);
  	} else {
  		fbcon_cursor_noblink = 1;
  		fbcon_del_cursor_timer(info);
  	}
  
  err:
  	release_console_sem();
  	return count;
  }
  
  static struct device_attribute device_attrs[] = {
  	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
  	__ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
  	__ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
  	       store_cursor_blink),
  };
  
  static int fbcon_init_device(void)
  {
  	int i, error = 0;
  
  	fbcon_has_sysfs = 1;
  
  	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
  		error = device_create_file(fbcon_device, &device_attrs[i]);
  
  		if (error)
  			break;
  	}
  
  	if (error) {
  		while (--i >= 0)
  			device_remove_file(fbcon_device, &device_attrs[i]);
  
  		fbcon_has_sysfs = 0;
  	}
  
  	return 0;
  }
  
  static void fbcon_start(void)
  {
  	if (num_registered_fb) {
  		int i;
  
  		acquire_console_sem();
  
  		for (i = 0; i < FB_MAX; i++) {
  			if (registered_fb[i] != NULL) {
  				info_idx = i;
  				break;
  			}
  		}
  
  		release_console_sem();
  		fbcon_takeover(0);
  	}
  }
  
  static void fbcon_exit(void)
  {
  	struct fb_info *info;
  	int i, j, mapped;
  
  	if (fbcon_has_exited)
  		return;
  
  #ifdef CONFIG_ATARI
  	free_irq(IRQ_AUTO_4, fb_vbl_handler);
  #endif
  #ifdef CONFIG_MAC
  	if (MACH_IS_MAC && vbl_detected)
  		free_irq(IRQ_MAC_VBL, fb_vbl_handler);
  #endif
  
  	kfree((void *)softback_buf);
  	softback_buf = 0UL;
  
  	for (i = 0; i < FB_MAX; i++) {
  		mapped = 0;
  		info = registered_fb[i];
  
  		if (info == NULL)
  			continue;
  
  		for (j = first_fb_vc; j <= last_fb_vc; j++) {
  			if (con2fb_map[j] == i)
  				mapped = 1;
  		}
  
  		if (mapped) {
  			if (info->fbops->fb_release)
  				info->fbops->fb_release(info, 0);
  			module_put(info->fbops->owner);
  
  			if (info->fbcon_par) {
  				struct fbcon_ops *ops = info->fbcon_par;
  
  				fbcon_del_cursor_timer(info);
  				kfree(ops->cursor_src);
  				kfree(info->fbcon_par);
  				info->fbcon_par = NULL;
  			}
  
  			if (info->queue.func == fb_flashcursor)
  				info->queue.func = NULL;
  		}
  	}
  
  	fbcon_has_exited = 1;
  }
  
  static int __init fb_console_init(void)
  {
  	int i;
  
  	acquire_console_sem();
  	fb_register_client(&fbcon_event_notifier);
  	fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), "fbcon");
  
  	if (IS_ERR(fbcon_device)) {
  		printk(KERN_WARNING "Unable to create device "
  		       "for fbcon; errno = %ld\n",
  		       PTR_ERR(fbcon_device));
  		fbcon_device = NULL;
  	} else
  		fbcon_init_device();
  
  	for (i = 0; i < MAX_NR_CONSOLES; i++)
  		con2fb_map[i] = -1;
  
  	release_console_sem();
  	fbcon_start();
  	return 0;
  }
  
  module_init(fb_console_init);
  
  #ifdef MODULE
  
  static void __exit fbcon_deinit_device(void)
  {
  	int i;
  
  	if (fbcon_has_sysfs) {
  		for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
  			device_remove_file(fbcon_device, &device_attrs[i]);
  
  		fbcon_has_sysfs = 0;
  	}
  }
  
  static void __exit fb_console_exit(void)
  {
  	acquire_console_sem();
  	fb_unregister_client(&fbcon_event_notifier);
  	fbcon_deinit_device();
  	device_destroy(fb_class, MKDEV(0, 0));
  	fbcon_exit();
  	release_console_sem();
  	unregister_con_driver(&fb_con);
  }	
  
  module_exit(fb_console_exit);
  
  #endif
  
  MODULE_LICENSE("GPL");
  