A syscons implementation using the 8-bit framebuffer set up by

OpenFirmware. Not at all optimized, but provides a PC-style
user-experience.

Tested on revA imac, B&W G3, 2k iBook, and G4 eMac.

6 files changed, 927 insertions, 0 deletions

diff --git a/sys/powerpc/aim/clock.c b/sys/powerpc/aim/clock.c
index cee97f4..fe0ff54 100644
--- a/sys/powerpc/aim/clock.c
+++ b/sys/powerpc/aim/clock.c
@@ -330,3 +330,13 @@ void
 cpu_stopprofclock(void)
 {
 }
+
+/*
+ * XXX Needed by syscons
+ */
+int
+sysbeep(int pitch, int period)
+{
+
+	return (0);
+}
diff --git a/sys/powerpc/include/sc_machdep.h b/sys/powerpc/include/sc_machdep.h
new file mode 100644
index 0000000..4f3526f
--- /dev/null
+++ b/sys/powerpc/include/sc_machdep.h
@@ -0,0 +1,71 @@
+/*-
+ * Copyright (c) 2003 Jake Burkholder.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_MACHINE_SC_MACHDEP_H_
+#define	_MACHINE_SC_MACHDEP_H_
+
+/* Color attributes for foreground text */
+
+#define	FG_BLACK		0x0
+#define	FG_BLUE			0x1
+#define	FG_GREEN		0x2
+#define	FG_CYAN			0x3
+#define	FG_RED			0x4
+#define	FG_MAGENTA		0x5
+#define	FG_BROWN		0x6
+#define	FG_LIGHTGREY		0x7	/* aka white */
+#define	FG_DARKGREY		0x8
+#define	FG_LIGHTBLUE		0x9
+#define	FG_LIGHTGREEN		0xa
+#define	FG_LIGHTCYAN		0xb
+#define	FG_LIGHTRED		0xc
+#define	FG_LIGHTMAGENTA		0xd
+#define	FG_YELLOW		0xe
+#define	FG_WHITE		0xf	/* aka bright white */
+#define	FG_BLINK		0x80
+
+/* Color attributes for text background */
+
+#define	BG_BLACK		0x00
+#define	BG_BLUE			0x10
+#define	BG_GREEN		0x20
+#define	BG_CYAN			0x30
+#define	BG_RED			0x40
+#define	BG_MAGENTA		0x50
+#define	BG_BROWN		0x60
+#define	BG_LIGHTGREY		0x70
+#define	BG_DARKGREY		0x80
+#define	BG_LIGHTBLUE		0x90
+#define	BG_LIGHTGREEN		0xa0
+#define	BG_LIGHTCYAN		0xb0
+#define	BG_LIGHTRED		0xc0
+#define	BG_LIGHTMAGENTA		0xd0
+#define	BG_YELLOW		0xe0
+#define	BG_WHITE		0xf0
+
+#endif /* !_MACHINE_SC_MACHDEP_H_ */
diff --git a/sys/powerpc/ofw/ofw_syscons.c b/sys/powerpc/ofw/ofw_syscons.c
new file mode 100644
index 0000000..697e75d
--- /dev/null
+++ b/sys/powerpc/ofw/ofw_syscons.c
@@ -0,0 +1,694 @@
+/*-
+ * Copyright (c) 2003 Peter Grehan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/conf.h>
+#include <sys/cons.h>
+#include <sys/proc.h>
+#include <sys/fcntl.h>
+#include <sys/malloc.h>
+#include <sys/fbio.h>
+#include <sys/consio.h>
+
+#include <machine/bus.h>
+#include <machine/sc_machdep.h>
+
+#include <sys/rman.h>
+
+#include <dev/fb/fbreg.h>
+#include <dev/syscons/syscons.h>
+
+#include <dev/ofw/openfirm.h>
+#include <powerpc/ofw/ofw_syscons.h>
+#include <machine/nexusvar.h>
+
+extern u_char dflt_font_16[];
+extern u_char dflt_font_14[];
+extern u_char dflt_font_8[];
+
+static int ofwfb_configure(int flags);
+
+static vi_probe_t ofwfb_probe;
+static vi_init_t ofwfb_init;
+static vi_get_info_t ofwfb_get_info;
+static vi_query_mode_t ofwfb_query_mode;
+static vi_set_mode_t ofwfb_set_mode;
+static vi_save_font_t ofwfb_save_font;
+static vi_load_font_t ofwfb_load_font;
+static vi_show_font_t ofwfb_show_font;
+static vi_save_palette_t ofwfb_save_palette;
+static vi_load_palette_t ofwfb_load_palette;
+static vi_set_border_t ofwfb_set_border;
+static vi_save_state_t ofwfb_save_state;
+static vi_load_state_t ofwfb_load_state;
+static vi_set_win_org_t ofwfb_set_win_org;
+static vi_read_hw_cursor_t ofwfb_read_hw_cursor;
+static vi_set_hw_cursor_t ofwfb_set_hw_cursor;
+static vi_set_hw_cursor_shape_t ofwfb_set_hw_cursor_shape;
+static vi_blank_display_t ofwfb_blank_display;
+static vi_mmap_t ofwfb_mmap;
+static vi_ioctl_t ofwfb_ioctl;
+static vi_clear_t ofwfb_clear;
+static vi_fill_rect_t ofwfb_fill_rect;
+static vi_bitblt_t ofwfb_bitblt;
+static vi_diag_t ofwfb_diag;
+static vi_save_cursor_palette_t ofwfb_save_cursor_palette;
+static vi_load_cursor_palette_t ofwfb_load_cursor_palette;
+static vi_copy_t ofwfb_copy;
+static vi_putp_t ofwfb_putp;
+static vi_putc_t ofwfb_putc;
+static vi_puts_t ofwfb_puts;
+static vi_putm_t ofwfb_putm;
+
+static video_switch_t ofwfbvidsw = {
+	.probe			= ofwfb_probe,
+	.init			= ofwfb_init,
+	.get_info		= ofwfb_get_info,
+	.query_mode		= ofwfb_query_mode,
+	.set_mode		= ofwfb_set_mode,
+	.save_font		= ofwfb_save_font,
+	.load_font		= ofwfb_load_font,
+	.show_font		= ofwfb_show_font,
+	.save_palette		= ofwfb_save_palette,
+	.load_palette		= ofwfb_load_palette,
+	.set_border		= ofwfb_set_border,
+	.save_state		= ofwfb_save_state,
+	.load_state		= ofwfb_load_state,
+	.set_win_org		= ofwfb_set_win_org,
+	.read_hw_cursor		= ofwfb_read_hw_cursor,
+	.set_hw_cursor		= ofwfb_set_hw_cursor,
+	.set_hw_cursor_shape	= ofwfb_set_hw_cursor_shape,
+	.blank_display		= ofwfb_blank_display,
+	.mmap			= ofwfb_mmap,
+	.ioctl			= ofwfb_ioctl,
+	.clear			= ofwfb_clear,
+	.fill_rect		= ofwfb_fill_rect,
+	.bitblt			= ofwfb_bitblt,
+	.diag			= ofwfb_diag,
+	.save_cursor_palette	= ofwfb_save_cursor_palette,
+	.load_cursor_palette	= ofwfb_load_cursor_palette,
+	.copy			= ofwfb_copy,
+	.putp			= ofwfb_putp,
+	.putc			= ofwfb_putc,
+	.puts			= ofwfb_puts,
+	.putm			= ofwfb_putm,
+};
+
+VIDEO_DRIVER(ofwfb, ofwfbvidsw, ofwfb_configure);
+
+extern sc_rndr_sw_t txtrndrsw;
+RENDERER(ofwfb, 0, txtrndrsw, gfb_set);
+
+RENDERER_MODULE(ofwfb, gfb_set);
+
+/*
+ * Define the iso6429-1983 colormap
+ */
+static struct {
+	u_int8_t	red;
+	u_int8_t	green;
+	u_int8_t	blue;
+} ofwfb_cmap[16] = {		/*  #     R    G    B   Color */
+				/*  -     -    -    -   ----- */
+	{ 0x00, 0x00, 0x00 },	/*  0     0    0    0   Black */
+	{ 0x00, 0x00, 0xaa },	/*  1     0    0  2/3   Blue  */
+	{ 0x00, 0xaa, 0x00 },	/*  2     0  2/3    0   Green */
+	{ 0x00, 0xaa, 0xaa },	/*  3     0  2/3  2/3   Cyan  */
+	{ 0xaa, 0x00, 0x00 },	/*  4   2/3    0    0   Red   */
+	{ 0xaa, 0x00, 0xaa },	/*  5   2/3    0  2/3   Magenta */
+	{ 0xaa, 0x55, 0x00 },	/*  6   2/3  1/3    0   Brown */
+	{ 0xaa, 0xaa, 0xaa },	/*  7   2/3  2/3  2/3   White */
+        { 0x55, 0x55, 0x55 },	/*  8   1/3  1/3  1/3   Gray  */
+	{ 0x55, 0x55, 0xff },	/*  9   1/3  1/3    1   Bright Blue  */
+	{ 0x55, 0xff, 0x55 },	/* 10   1/3    1  1/3   Bright Green */
+	{ 0x55, 0xff, 0xff },	/* 11   1/3    1    1   Bright Cyan  */
+	{ 0xff, 0x55, 0x55 },	/* 12     1  1/3  1/3   Bright Red   */
+	{ 0xff, 0x55, 0xff },	/* 13     1  1/3    1   Bright Magenta */
+	{ 0xff, 0xff, 0x80 },	/* 14     1    1  1/3   Bright Yellow */
+	{ 0xff, 0xff, 0xff }	/* 15     1    1    1   Bright White */
+};
+
+#define	TODO	printf("%s: unimplemented\n", __func__)
+
+static u_int16_t ofwfb_static_window[ROW*COL];
+
+static struct ofwfb_softc ofwfb_softc;
+
+static int
+ofwfb_background(u_int8_t attr)
+{
+	return (attr >> 4);
+}
+
+static int
+ofwfb_foreground(u_int8_t attr)
+{
+	return (attr & 0x0f);
+}
+
+static int
+ofwfb_configure(int flags)
+{
+	struct ofwfb_softc *sc;
+        phandle_t chosen;
+        ihandle_t stdout;
+	phandle_t node;
+	int depth;
+	int disable;
+	char type[16];
+	static int done = 0;
+
+	disable = 0;
+	TUNABLE_INT_FETCH("hw.syscons.disable", &disable);
+	if (disable != 0)
+		return (0);
+
+	if (done != 0)
+		return (0);
+	done = 1;
+
+	sc = &ofwfb_softc;
+
+	chosen = OF_finddevice("/chosen");
+	OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
+        node = OF_instance_to_package(stdout);
+        OF_getprop(node, "device_type", type, sizeof(type));
+        if (strcmp(type, "display") != 0)
+                return (0);
+
+	/* Only support 8-bit framebuffers */
+	OF_getprop(node, "depth", &depth, sizeof(depth));
+	if (depth != 8)
+		return (0);
+
+	sc->sc_node = node;
+	sc->sc_console = 1;
+	OF_getprop(node, "height", &sc->sc_height, sizeof(sc->sc_height));
+	OF_getprop(node, "width", &sc->sc_width, sizeof(sc->sc_width));
+	OF_getprop(node, "linebytes", &sc->sc_stride, sizeof(sc->sc_stride));
+
+	/*
+	 * XXX the physical address of the frame buffer is assumed to be
+	 * BAT-mapped so it can be accessed directly
+	 */
+	OF_getprop(node, "address", &sc->sc_addr, sizeof(sc->sc_addr));
+
+	ofwfb_init(0, &sc->sc_va, 0);
+
+	return (0);
+}
+
+static int
+ofwfb_probe(int unit, video_adapter_t **adp, void *arg, int flags)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_init(int unit, video_adapter_t *adp, int flags)
+{
+	struct ofwfb_softc *sc;
+	video_info_t *vi;
+	char name[64];
+	ihandle_t ih;
+	int i;
+	int cborder;
+	int font_height;
+	int retval;
+
+	sc = (struct ofwfb_softc *)adp;
+	vi = &adp->va_info;
+
+	vid_init_struct(adp, "ofwfb", -1, unit);
+
+	/*
+	 * Install the ISO6429 colormap - older OFW systems
+	 * don't do this by default
+	 */
+	memset(name, 0, sizeof(name));
+	OF_package_to_path(sc->sc_node, name, sizeof(name));
+	ih = OF_open(name);
+	for (i = 0; i < 16; i++) {
+		OF_call_method("color!", ih, 4, 1, 
+			       ofwfb_cmap[i].red,
+			       ofwfb_cmap[i].green,
+			       ofwfb_cmap[i].blue,
+			       i,
+			       &retval);
+	}
+
+	/* The default font size can be overridden by loader */
+	font_height = 16;
+	TUNABLE_INT_FETCH("hw.syscons.fsize", &font_height);
+	if (font_height == 8) {
+		sc->sc_font = dflt_font_8;
+		sc->sc_font_height = 8;
+	} else if (font_height == 14) {
+		sc->sc_font = dflt_font_14;
+		sc->sc_font_height = 14;
+	} else {
+		/* default is 8x16 */
+		sc->sc_font = dflt_font_16;
+		sc->sc_font_height = 16;
+	}
+
+	/* The user can set a border in chars - default is 1 char width */
+	cborder = 1;
+	TUNABLE_INT_FETCH("hw.syscons.border", &cborder);
+
+	vi->vi_cheight = sc->sc_font_height;
+	vi->vi_width = sc->sc_width/8 - 2*cborder;
+	vi->vi_height = sc->sc_height/sc->sc_font_height - 2*cborder;
+	vi->vi_cwidth = 8;
+
+	/*
+	 * Clamp width/height to syscons maximums
+	 */
+	if (vi->vi_width > COL)
+		vi->vi_width = COL;
+	if (vi->vi_height > ROW)
+		vi->vi_height = ROW;
+
+	sc->sc_xmargin = (sc->sc_width - (vi->vi_width * vi->vi_cwidth)) / 2;
+	sc->sc_ymargin = (sc->sc_height - (vi->vi_height * vi->vi_cheight))/2;
+
+	/*
+	 * Avoid huge amounts of conditional code in syscons by
+	 * defining a dummy h/w text display buffer.
+	 */
+	adp->va_window = (vm_offset_t) ofwfb_static_window;
+
+	/* Enable future font-loading... */
+	adp->va_flags |= V_ADP_FONT;
+
+	ofwfb_blank_display(&sc->sc_va, V_DISPLAY_ON);
+
+	ofwfb_set_mode(&sc->sc_va, 0);
+
+	vid_register(&sc->sc_va);
+
+	return (0);
+}
+
+static int
+ofwfb_get_info(video_adapter_t *adp, int mode, video_info_t *info)
+{
+	bcopy(&adp->va_info, info, sizeof(*info));
+	return (0);
+}
+
+static int
+ofwfb_query_mode(video_adapter_t *adp, video_info_t *info)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_set_mode(video_adapter_t *adp, int mode)
+{
+
+	return (0);
+}
+
+static int
+ofwfb_save_font(video_adapter_t *adp, int page, int size, u_char *data,
+    int c, int count)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_load_font(video_adapter_t *adp, int page, int size, u_char *data,
+    int c, int count)
+{
+	struct ofwfb_softc *sc;
+
+	sc = (struct ofwfb_softc *)adp;
+
+	/*
+	 * syscons code has already determined that current width/height
+	 * are unchanged for this new font
+	 */
+	sc->sc_font = data;
+	return (0);
+}
+
+static int
+ofwfb_show_font(video_adapter_t *adp, int page)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_save_palette(video_adapter_t *adp, u_char *palette)
+{
+	/* TODO; */
+	return (0);
+}
+
+static int
+ofwfb_load_palette(video_adapter_t *adp, u_char *palette)
+{
+	/* TODO; */
+	return (0);
+}
+
+static int
+ofwfb_set_border(video_adapter_t *adp, int border)
+{
+	/* TODO; */
+	return (0);
+}
+
+static int
+ofwfb_save_state(video_adapter_t *adp, void *p, size_t size)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_load_state(video_adapter_t *adp, void *p)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_set_win_org(video_adapter_t *adp, off_t offset)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_read_hw_cursor(video_adapter_t *adp, int *col, int *row)
+{
+	*col = 0;
+	*row = 0;
+
+	return (0);
+}
+
+static int
+ofwfb_set_hw_cursor(video_adapter_t *adp, int col, int row)
+{
+
+	return (0);
+}
+
+static int
+ofwfb_set_hw_cursor_shape(video_adapter_t *adp, int base, int height,
+    int celsize, int blink)
+{
+	return (0);
+}
+
+static int
+ofwfb_blank_display(video_adapter_t *adp, int mode)
+{
+	struct ofwfb_softc *sc;
+	int i;
+	u_int8_t *addr;
+
+	sc = (struct ofwfb_softc *)adp;
+	addr = (u_int8_t *) sc->sc_addr;
+
+	/* Could be done a lot faster e.g. 32-bits, or Altivec'd */
+	for (i = 0; i < sc->sc_stride*sc->sc_height; i++)
+		*(addr + i) = ofwfb_background(SC_NORM_ATTR);
+
+	return (0);
+}
+
+static int
+ofwfb_mmap(video_adapter_t *adp, vm_offset_t offset, vm_paddr_t *paddr,
+    int prot)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_ioctl(video_adapter_t *adp, u_long cmd, caddr_t data)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_clear(video_adapter_t *adp)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_fill_rect(video_adapter_t *adp, int val, int x, int y, int cx, int cy)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_bitblt(video_adapter_t *adp, ...)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_diag(video_adapter_t *adp, int level)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_save_cursor_palette(video_adapter_t *adp, u_char *palette)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_load_cursor_palette(video_adapter_t *adp, u_char *palette)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_copy(video_adapter_t *adp, vm_offset_t src, vm_offset_t dst, int n)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_putp(video_adapter_t *adp, vm_offset_t off, u_int32_t p, u_int32_t a,
+    int size, int bpp, int bit_ltor, int byte_ltor)
+{
+	TODO;
+	return (0);
+}
+
+static int
+ofwfb_putc(video_adapter_t *adp, vm_offset_t off, u_int8_t c, u_int8_t a)
+{
+	struct ofwfb_softc *sc;
+	int row;
+	int col;
+	int i, j, k;
+	u_int8_t *addr;
+	u_char *p;
+
+	sc = (struct ofwfb_softc *)adp;
+        row = (off / adp->va_info.vi_width) * adp->va_info.vi_cheight;
+        col = (off % adp->va_info.vi_width) * adp->va_info.vi_cwidth;
+	p = sc->sc_font + c*sc->sc_font_height;
+	addr = (u_int8_t *)sc->sc_addr + (row + sc->sc_ymargin)*sc->sc_stride 
+		+ col + sc->sc_xmargin;
+
+	for (i = 0; i < sc->sc_font_height; i++) {
+		for (j = 0, k = 7; j < 8; j++, k--) {
+			if ((p[i] & (1 << k)) == 0)
+				*(addr + j) = ofwfb_background(a);
+			else
+				*(addr + j) = ofwfb_foreground(a);
+		}
+		addr += sc->sc_stride;
+	}
+
+	return (0);
+}
+
+static int
+ofwfb_puts(video_adapter_t *adp, vm_offset_t off, u_int16_t *s, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		ofwfb_putc(adp, off + i, s[i] & 0xff, (s[i] & 0xff00) >> 8);
+	}
+	return (0);
+}
+
+static int
+ofwfb_putm(video_adapter_t *adp, int x, int y, u_int8_t *pixel_image,
+    u_int32_t pixel_mask, int size)
+{
+	struct ofwfb_softc *sc;
+
+	sc = (struct ofwfb_softc *)adp;
+
+	/* put mouse */
+
+	return (0);
+}
+
+/*
+ * Define the syscons nexus device attachment
+ */
+static void
+ofwfb_scidentify(driver_t *driver, device_t parent)
+{
+	device_t child;
+
+	/*
+	 * Add with a priority guaranteed to make it last on
+	 * the device list
+	 */
+	child = BUS_ADD_CHILD(parent, INT_MAX, SC_DRIVER_NAME, 0);
+	if (child != NULL)
+		nexus_set_device_type(child, "syscons");
+}
+
+static int
+ofwfb_scprobe(device_t dev)
+{
+	char *name;
+
+	name = nexus_get_name(dev);
+	if (strcmp(SC_DRIVER_NAME, name) != 0)
+		return (ENXIO);
+
+	device_set_desc(dev, "System console");
+	return (sc_probe_unit(device_get_unit(dev), 
+	    device_get_flags(dev) | SC_AUTODETECT_KBD));
+}
+
+static int
+ofwfb_scattach(device_t dev)
+{
+	return (sc_attach_unit(device_get_unit(dev),
+	    device_get_flags(dev) | SC_AUTODETECT_KBD));
+}
+
+static device_method_t ofwfb_sc_methods[] = {
+  	DEVMETHOD(device_identify,	ofwfb_scidentify),
+	DEVMETHOD(device_probe,		ofwfb_scprobe),
+	DEVMETHOD(device_attach,	ofwfb_scattach),
+	{ 0, 0 }
+};
+
+static driver_t ofwfb_sc_driver = {
+	SC_DRIVER_NAME,
+	ofwfb_sc_methods,
+	sizeof(sc_softc_t),
+};
+
+static devclass_t	sc_devclass;
+
+DRIVER_MODULE(sc, nexus, ofwfb_sc_driver, sc_devclass, 0, 0);
+
+/*
+ * Define a stub keyboard driver in case one hasn't been
+ * compiled into the kernel
+ */
+#include <sys/kbio.h>
+#include <dev/kbd/kbdreg.h>
+
+static int dummy_kbd_configure(int flags);
+
+keyboard_switch_t dummysw;
+
+static int
+dummy_kbd_configure(int flags)
+{
+
+	return (0);
+}
+KEYBOARD_DRIVER(dummy, dummysw, dummy_kbd_configure);
+
+/*
+ * Utility routines from <dev/fb/fbreg.h>
+ */
+void
+ofwfb_bcopy(const void *s, void *d, size_t c)
+{
+	bcopy(s, d, c);
+}
+
+void
+ofwfb_bzero(void *d, size_t c)
+{
+	bzero(d, c);
+}
+
+void
+ofwfb_fillw(int pat, void *base, size_t cnt)
+{
+	u_int16_t *bptr = base;
+
+	while (cnt--)
+		*bptr++ = pat;
+}
+
+u_int16_t
+ofwfb_readw(u_int16_t *addr)
+{
+	return (*addr);
+}
+
+void
+ofwfb_writew(u_int16_t *addr, u_int16_t val)
+{
+	*addr = val;
+}
diff --git a/sys/powerpc/ofw/ofw_syscons.h b/sys/powerpc/ofw/ofw_syscons.h
new file mode 100644
index 0000000..de7308e
--- /dev/null
+++ b/sys/powerpc/ofw/ofw_syscons.h
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 2003 Peter Grehan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _OFW_SYSCONS_H_
+#define _OFW_SYSCONS_H_
+
+struct ofwfb_softc {
+	video_adapter_t	sc_va;
+	dev_t	       	sc_si;
+	phandle_t	sc_node;
+	int	       	sc_console;
+
+	intptr_t	sc_addr;
+        int	       	sc_height;
+        int	       	sc_width;
+	int	       	sc_stride;
+        int	       	sc_ncol;
+        int	       	sc_nrow;
+
+	int	       	sc_xmargin;
+	int	       	sc_ymargin;
+
+	u_char	       *sc_font;
+	int		sc_font_height;
+};
+
+#endif
diff --git a/sys/powerpc/powerpc/clock.c b/sys/powerpc/powerpc/clock.c
index cee97f4..fe0ff54 100644
--- a/sys/powerpc/powerpc/clock.c
+++ b/sys/powerpc/powerpc/clock.c
@@ -330,3 +330,13 @@ void
 cpu_stopprofclock(void)
 {
 }
+
+/*
+ * XXX Needed by syscons
+ */
+int
+sysbeep(int pitch, int period)
+{
+
+	return (0);
+}
diff --git a/sys/powerpc/powerpc/sc_machdep.c b/sys/powerpc/powerpc/sc_machdep.c
new file mode 100644
index 0000000..a81ffdd
--- /dev/null
+++ b/sys/powerpc/powerpc/sc_machdep.c
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2003 Jake Burkholder.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/cons.h>
+#include <sys/kbio.h>
+#include <sys/consio.h>
+#include <sys/sysctl.h>
+
+#include <dev/syscons/syscons.h>
+
+static sc_softc_t sc_softcs[8];
+
+int
+sc_get_cons_priority(int *unit, int *flags)
+{
+
+	*unit = 0;
+	*flags = 0;
+	return (CN_INTERNAL);
+}
+
+int
+sc_max_unit(void)
+{
+	return (1);
+}
+
+sc_softc_t *
+sc_get_softc(int unit, int flags)
+{
+	sc_softc_t *sc;
+
+	if (unit < 0)
+		return (NULL);
+	sc = &sc_softcs[unit];
+	sc->unit = unit;
+	if ((sc->flags & SC_INIT_DONE) == 0) {
+		sc->keyboard = -1;
+		sc->adapter = -1;
+		sc->cursor_char = SC_CURSOR_CHAR;
+		sc->mouse_char = SC_MOUSE_CHAR;
+	}
+	return (sc);
+}
+
+void
+sc_get_bios_values(bios_values_t *values)
+{
+	values->cursor_start = 0;
+	values->cursor_end = 32;
+	values->shift_state = 0;
+}
+
+int
+sc_tone(int hz)
+{
+	return (0);
+}