Index: HelenOS.config
===================================================================
--- HelenOS.config	(revision 0350033806de9ffc378d5247618a982a1e61b770)
+++ HelenOS.config	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
@@ -608,4 +608,7 @@
 ! [(PLATFORM=ia32|PLATFORM=amd64|MACHINE=beagleboardxm)&CONFIG_HID_OUT!=none&CONFIG_FB=y] CONFIG_BFB_BPP (choice)
 
+% Window system
+! [CONFIG_FB=y] CONFIG_WINSYS (y/n)
+
 % Display double buffering
 ! [CONFIG_FB=y] CONFIG_DISP_DOUBLE_BUF (y/n)
Index: uspace/app/init/init.c
===================================================================
--- uspace/app/init/init.c	(revision 0350033806de9ffc378d5247618a982a1e61b770)
+++ uspace/app/init/init.c	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
@@ -272,4 +272,6 @@
 }
 
+#ifdef CONFIG_WINSYS
+
 static errno_t display_server(void)
 {
@@ -302,4 +304,6 @@
 	return retval;
 }
+
+#endif
 
 static void getterm(const char *svc, const char *app, bool msg)
@@ -468,4 +472,5 @@
 	init_sysvol();
 
+#ifdef CONFIG_WINSYS
 	if (!config_key_exists("console")) {
 		rc = display_server();
@@ -476,5 +481,5 @@
 		}
 	}
-
+#endif
 	rc = console(HID_INPUT, HID_OUTPUT);
 	if (rc == EOK) {
Index: uspace/srv/hid/output/meson.build
===================================================================
--- uspace/srv/hid/output/meson.build	(revision 0350033806de9ffc378d5247618a982a1e61b770)
+++ uspace/srv/hid/output/meson.build	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
@@ -28,9 +28,10 @@
 #
 
-deps = [ 'drv' ]
+deps = [ 'drv', 'fbfont', 'pixconv', 'ddev' ]
 src = files(
 	'ctl/serial.c',
 	'port/ega.c',
 	'port/chardev.c',
+	'port/ddev.c',
 	'proto/vt100.c',
 	'output.c',
Index: uspace/srv/hid/output/output.c
===================================================================
--- uspace/srv/hid/output/output.c	(revision 0350033806de9ffc378d5247618a982a1e61b770)
+++ uspace/srv/hid/output/output.c	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
@@ -41,4 +41,5 @@
 #include "port/ega.h"
 #include "port/chardev.h"
+#include "port/ddev.h"
 #include "output.h"
 
@@ -486,4 +487,12 @@
 	if (!config_key_exists("console")) {
 		ega_init();
+#if defined(CONFIG_FB) && !defined(CONFIG_WINSYS)
+		/*
+		 * NOTE: We don't have a good way of detecting the absence
+		 * of a KFB display device at run time because of the
+		 * asunchronous nature of device discovery
+		 */
+		output_ddev_init();
+#endif
 	}
 
Index: uspace/srv/hid/output/port/ddev.c
===================================================================
--- uspace/srv/hid/output/port/ddev.c	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
+++ uspace/srv/hid/output/port/ddev.c	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
@@ -0,0 +1,325 @@
+/*
+ * Copyright (c) 2020 Jiri Svoboda
+ * Copyright (c) 2008 Martin Decky
+ * Copyright (c) 2006 Jakub Vana
+ * Copyright (c) 2006 Ondrej Palkovsky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup output
+ * @{
+ */
+
+#include <ddev.h>
+#include <errno.h>
+#include <fbfont/font-8x16.h>
+#include <gfx/bitmap.h>
+#include <gfx/color.h>
+#include <gfx/coord.h>
+#include <gfx/context.h>
+#include <gfx/render.h>
+#include <io/chargrid.h>
+#include <io/pixelmap.h>
+#include <stdlib.h>
+#include "../output.h"
+#include "ddev.h"
+
+#define KFB_DDEV_NAME "devices/\\virt\\kfb\\kfb"
+
+typedef struct {
+	gfx_context_t *gc;
+
+	sysarg_t cols;
+	sysarg_t rows;
+
+	uint8_t style_normal;
+	uint8_t style_inverted;
+
+	gfx_bitmap_t *bitmap;
+	pixelmap_t pixelmap;
+	gfx_rect_t dirty;
+
+	sysarg_t curs_col;
+	sysarg_t curs_row;
+	bool curs_visible;
+} output_ddev_t;
+
+static pixel_t color_table[16] = {
+	[COLOR_BLACK]       = 0x000000,
+	[COLOR_BLUE]        = 0x0000f0,
+	[COLOR_GREEN]       = 0x00f000,
+	[COLOR_CYAN]        = 0x00f0f0,
+	[COLOR_RED]         = 0xf00000,
+	[COLOR_MAGENTA]     = 0xf000f0,
+	[COLOR_YELLOW]      = 0xf0f000,
+	[COLOR_WHITE]       = 0xf0f0f0,
+
+	[COLOR_BLACK + 8]   = 0x000000,
+	[COLOR_BLUE + 8]    = 0x0000ff,
+	[COLOR_GREEN + 8]   = 0x00ff00,
+	[COLOR_CYAN + 8]    = 0x00ffff,
+	[COLOR_RED + 8]     = 0xff0000,
+	[COLOR_MAGENTA + 8] = 0xff00ff,
+	[COLOR_YELLOW + 8]  = 0xffff00,
+	[COLOR_WHITE + 8]   = 0xffffff,
+};
+
+static void attrs_rgb(char_attrs_t attrs, pixel_t *bgcolor, pixel_t *fgcolor)
+{
+	switch (attrs.type) {
+	case CHAR_ATTR_STYLE:
+		switch (attrs.val.style) {
+		case STYLE_NORMAL:
+			*bgcolor = color_table[COLOR_WHITE];
+			*fgcolor = color_table[COLOR_BLACK];
+			break;
+		case STYLE_EMPHASIS:
+			*bgcolor = color_table[COLOR_WHITE];
+			*fgcolor = color_table[COLOR_RED];
+			break;
+		case STYLE_INVERTED:
+			*bgcolor = color_table[COLOR_BLACK];
+			*fgcolor = color_table[COLOR_WHITE];
+			break;
+		case STYLE_SELECTED:
+			*bgcolor = color_table[COLOR_RED];
+			*fgcolor = color_table[COLOR_WHITE];
+			break;
+		}
+		break;
+	case CHAR_ATTR_INDEX:
+		*bgcolor = color_table[(attrs.val.index.bgcolor & 7) |
+		    ((attrs.val.index.attr & CATTR_BRIGHT) ? 8 : 0)];
+		*fgcolor = color_table[(attrs.val.index.fgcolor & 7) |
+		    ((attrs.val.index.attr & CATTR_BRIGHT) ? 8 : 0)];
+		break;
+	case CHAR_ATTR_RGB:
+		*bgcolor = attrs.val.rgb.bgcolor;
+		*fgcolor = attrs.val.rgb.fgcolor;
+		break;
+	}
+}
+
+/** Draw the character at the specified position.
+ *
+ * @param field Character field.
+ * @param col   Horizontal screen position.
+ * @param row   Vertical screen position.
+ *
+ */
+static void draw_char(output_ddev_t *ddev, charfield_t *field,
+    sysarg_t col, sysarg_t row)
+{
+	pixel_t fgcolor;
+	pixel_t bgcolor;
+	pixel_t pcolor;
+	pixel_t tmp;
+	gfx_rect_t rect;
+	gfx_rect_t ndrect;
+	gfx_coord_t x, y;
+	bool inverted;
+	uint32_t glyph;
+
+	fgcolor = bgcolor = 0;
+	attrs_rgb(field->attrs, &bgcolor, &fgcolor);
+
+	inverted = (col == ddev->curs_col) && (row == ddev->curs_row) &&
+	    ddev->curs_visible;
+
+	if (inverted) {
+		/* Swap foreground and background colors */
+		tmp = bgcolor;
+		bgcolor = fgcolor;
+		fgcolor = tmp;
+	}
+
+	rect.p0.x = FONT_WIDTH * col;
+	rect.p0.y = FONT_SCANLINES * row;
+	rect.p1.x = FONT_WIDTH * (col + 1);
+	rect.p1.y = FONT_SCANLINES * (row + 1);
+
+	glyph = fb_font_glyph(field->ch, NULL);
+
+	for (y = 0; y < FONT_SCANLINES; y++) {
+		for (x = 0; x < FONT_WIDTH; x++) {
+			pcolor = fb_font[glyph][y] & (1 << (7 - x)) ?
+			    fgcolor : bgcolor;
+			pixelmap_put_pixel(&ddev->pixelmap,
+			    rect.p0.x + x, rect.p0.y + y, pcolor);
+		}
+	}
+
+	/* Compute new dirty rectangle */
+	gfx_rect_envelope(&ddev->dirty, &rect, &ndrect);
+	ddev->dirty = ndrect;
+}
+
+static errno_t output_ddev_yield(outdev_t *dev)
+{
+	return EOK;
+}
+
+static errno_t output_ddev_claim(outdev_t *dev)
+{
+	return EOK;
+}
+
+static void output_ddev_get_dimensions(outdev_t *dev, sysarg_t *cols, sysarg_t *rows)
+{
+	output_ddev_t *ddev = (output_ddev_t *) dev->data;
+
+	*cols = ddev->cols;
+	*rows = ddev->rows;
+}
+
+static console_caps_t output_ddev_get_caps(outdev_t *dev)
+{
+	return (CONSOLE_CAP_STYLE | CONSOLE_CAP_INDEXED | CONSOLE_CAP_RGB);
+}
+
+static void output_ddev_char_update(outdev_t *dev, sysarg_t col, sysarg_t row)
+{
+	output_ddev_t *ddev = (output_ddev_t *) dev->data;
+
+	charfield_t *field =
+	    chargrid_charfield_at(dev->backbuf, col, row);
+
+	draw_char(ddev, field, col, row);
+}
+
+static void output_ddev_cursor_update(outdev_t *dev, sysarg_t prev_col,
+    sysarg_t prev_row, sysarg_t col, sysarg_t row, bool visible)
+{
+	output_ddev_t *ddev = (output_ddev_t *) dev->data;
+
+	ddev->curs_col = col;
+	ddev->curs_row = row;
+	ddev->curs_visible = visible;
+
+	output_ddev_char_update(dev, prev_col, prev_row);
+	output_ddev_char_update(dev, col, row);
+}
+
+static void output_ddev_flush(outdev_t *dev)
+{
+	output_ddev_t *ddev = (output_ddev_t *) dev->data;
+
+	(void) gfx_bitmap_render(ddev->bitmap, &ddev->dirty, NULL);
+
+	ddev->dirty.p0.x = 0;
+	ddev->dirty.p0.y = 0;
+	ddev->dirty.p1.x = 0;
+	ddev->dirty.p1.y = 0;
+}
+
+static outdev_ops_t output_ddev_ops = {
+	.yield = output_ddev_yield,
+	.claim = output_ddev_claim,
+	.get_dimensions = output_ddev_get_dimensions,
+	.get_caps = output_ddev_get_caps,
+	.cursor_update = output_ddev_cursor_update,
+	.char_update = output_ddev_char_update,
+	.flush = output_ddev_flush
+};
+
+errno_t output_ddev_init(void)
+{
+	ddev_t *dd = NULL;
+	output_ddev_t *ddev = NULL;
+	ddev_info_t info;
+	gfx_coord2_t dims;
+	gfx_context_t *gc;
+	gfx_bitmap_params_t params;
+	gfx_bitmap_alloc_t alloc;
+	gfx_bitmap_t *bitmap = NULL;
+	errno_t rc;
+
+	ddev = calloc(1, sizeof(output_ddev_t));
+	if (ddev == NULL)
+		return ENOMEM;
+
+	rc = ddev_open(KFB_DDEV_NAME, &dd);
+	if (rc != EOK) {
+		printf("Error opening display device '%s'.", KFB_DDEV_NAME);
+		goto error;
+	}
+
+	rc = ddev_get_info(dd, &info);
+	if (rc != EOK) {
+		printf("Error getting information for display device '%s'.",
+		    KFB_DDEV_NAME);
+		goto error;
+	}
+
+	rc = ddev_get_gc(dd, &gc);
+	if (rc != EOK) {
+		printf("Error getting device context for '%s'.", KFB_DDEV_NAME);
+		goto error;
+	}
+
+	gfx_bitmap_params_init(&params);
+	params.rect = info.rect;
+
+	rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
+	if (rc != EOK) {
+		printf("Error creating screen bitmap.\n");
+		goto error;
+	}
+
+	rc = gfx_bitmap_get_alloc(bitmap, &alloc);
+	if (rc != EOK) {
+		printf("Error getting bitmap allocation info.\n");
+		goto error;
+	}
+
+	gfx_rect_dims(&info.rect, &dims);
+
+	ddev->gc = gc;
+	ddev->cols = dims.x / FONT_WIDTH;
+	ddev->rows = dims.y / FONT_SCANLINES;
+	ddev->bitmap = bitmap;
+	ddev->pixelmap.width = dims.x;
+	ddev->pixelmap.height = dims.y;
+	ddev->pixelmap.data = alloc.pixels;
+
+	outdev_t *dev = outdev_register(&output_ddev_ops, (void *) ddev);
+	if (dev == NULL) {
+		rc = EINVAL;
+		goto error;
+	}
+
+	return EOK;
+error:
+	if (dd != NULL)
+		ddev_close(dd);
+	if (bitmap != NULL)
+		gfx_bitmap_destroy(bitmap);
+	free(ddev);
+	return rc;
+}
+
+/** @}
+ */
Index: uspace/srv/hid/output/port/ddev.h
===================================================================
--- uspace/srv/hid/output/port/ddev.h	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
+++ uspace/srv/hid/output/port/ddev.h	(revision 13824465fb4456a3eecfaf3c2ff08fb0cbdc3a55)
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup output
+ * @{
+ */
+
+#ifndef OUTPUT_PORT_DDEV_H_
+#define OUTPUT_PORT_DDEV_H_
+
+extern errno_t output_ddev_init(void);
+
+#endif
+
+/** @}
+ */
