fbcon.c

h内核

	}
	scrollback_max = 0;
	scrollback_current = 0;

	update_var(vc->vc_num, 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);
		update_region(fg_console,
			      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)
{
	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;
	}
}

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;
	int active = !fbcon_is_inactive(vc, info);

	if (mode_switch) {
		struct fb_var_screeninfo var = info->var;
/*
 * HACK ALERT: Some hardware will require reinitializion at this stage,
 *             others will require it to be done as late as possible.
 *             For now, we differentiate this with the
 *             FBINFO_MISC_MODESWITCHLATE bitflag.  Worst case will be
 *             hardware that requires it here and another one later.
 *             A definitive solution may require fixing X or the VT
 *             system.
 */
		if (info->flags & FBINFO_MISC_MODESWITCHLATE)
			info->flags |= FBINFO_MISC_MODESWITCH;

		if (!blank && !(info->flags & FBINFO_MISC_MODESWITCHLATE)) {
			var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
			fb_set_var(info, &var);
		}
	}

 	if (active) {
		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->vc_num);
 	}

 	return 0;
}

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 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,
			     u8 * data, int userfont)
{
	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
	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 = 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) {
		/* reset wrap/pan */
		info->var.xoffset = info->var.yoffset = p->yscroll = 0;
		vc_resize(vc->vc_num, info->var.xres / w, info->var.yres / h);
		if (CON_IS_VISIBLE(vc) && softback_buf) {
			int l = fbcon_softback_size / vc->vc_size_row;
			if (l > 5)
				softback_end =
				    softback_buf + l * vc->vc_size_row;
			else {
				/* Smaller scrollback makes no sense, and 0 would screw
				   the operation totally */
				softback_top = 0;
			}
		}
	} else if (CON_IS_VISIBLE(vc)
		   && vt_cons[vc->vc_num]->vc_mode == KD_TEXT) {
		fbcon_clear_margins(vc, 0);
		update_screen(vc->vc_num);
	}

	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)
{
	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;

	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 = 0; i < MAX_NR_CONSOLES; 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 = 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]];
	struct font_desc *f;

	if (!name)
		f = get_default_font(info->var.xres, info->var.yres);
	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;

	depth = fb_get_color_depth(info);
	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 display *p = &fb_display[fg_console];
	int offset, limit, scrollback_old;

	if (softback_top) {
		if (vc->vc_num != fg_console)
			return 0;
		if (vt_cons[vc->vc_num]->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 = p;
				update_region(vc->vc_num, vc->vc_origin,
					      logo_lines * vc->vc_cols);
			}
			logo_sho