xref: /src/sys/dev/tc/mfb.c

/* $NetBSD: mfb.c,v 1.26.2.5 2002/08/01 02:45:49 nathanw Exp $ */

/*
 * Copyright (c) 1998, 1999 Tohru Nishimura.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Tohru Nishimura
 *	for the NetBSD Project.
 * 4. 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mfb.c,v 1.26.2.5 2002/08/01 02:45:49 nathanw Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/ioctl.h>

#include <machine/bus.h>
#include <machine/intr.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>

#include <dev/rasops/rasops.h>
#include <dev/wsfont/wsfont.h>

#include <dev/tc/tcvar.h>
#include <dev/ic/bt431reg.h>

#include <uvm/uvm_extern.h>

#if defined(pmax)
#define	machine_btop(x) mips_btop(MIPS_KSEG1_TO_PHYS(x))

#define	BYTE(base, index)	*((u_int8_t *)(base) + ((index)<<2))
#define	HALF(base, index)	*((u_int16_t *)(base) + ((index)<<1))
#endif

#if defined(__alpha__) || defined(alpha)
#define	machine_btop(x) alpha_btop(ALPHA_K0SEG_TO_PHYS(x))

#define	BYTE(base, index)	*((u_int32_t *)(base) + (index))
#define	HALF(base, index)	*((u_int32_t *)(base) + (index))
#endif

/* Bt455 hardware registers */
#define	bt_reg	0
#define	bt_cmap	1
#define	bt_clr	2
#define	bt_ovly	3

/* Bt431 hardware registers */
#define	bt_lo	0
#define	bt_hi	1
#define	bt_ram	2
#define	bt_ctl	3

#define	SELECT455(vdac, regno) do {	\
	BYTE(vdac, bt_reg) = (regno);	\
	BYTE(vdac, bt_clr) = 0;		\
	tc_wmb();			\
   } while (0)

#define	TWIN(x)    ((x)|((x) << 8))
#define	TWIN_LO(x) (twin = (x) & 0x00ff, twin << 8 | twin)
#define	TWIN_HI(x) (twin = (x) & 0xff00, twin | twin >> 8)

#define	SELECT431(curs, regno) do {	\
	HALF(curs, bt_lo) = TWIN(regno);\
	HALF(curs, bt_hi) = 0;		\
	tc_wmb();			\
   } while (0)

struct hwcursor64 {
	struct wsdisplay_curpos cc_pos;
	struct wsdisplay_curpos cc_hot;
	struct wsdisplay_curpos cc_size;
	struct wsdisplay_curpos cc_magic;
#define	CURSOR_MAX_SIZE	64
	u_int8_t cc_color[6];
	u_int64_t cc_image[64 + 64];
};

struct mfb_softc {
	struct device sc_dev;
	vaddr_t sc_vaddr;
	size_t sc_size;
	struct rasops_info *sc_ri;
	struct hwcursor64 sc_cursor;	/* software copy of cursor */
	int sc_blanked;
	int sc_curenb;			/* cursor sprite enabled */
	int sc_changed;			/* need update of hardware */
	int nscreens;
};

#define	MX_MAGIC_X	360
#define	MX_MAGIC_Y	36

#define	MX_FB_OFFSET	0x200000
#define	MX_FB_SIZE	0x200000
#define	MX_BT455_OFFSET	0x100000
#define	MX_BT431_OFFSET	0x180000
#define	MX_IREQ_OFFSET	0x080000	/* Interrupt req. control */

static int  mfbmatch __P((struct device *, struct cfdata *, void *));
static void mfbattach __P((struct device *, struct device *, void *));

const struct cfattach mfb_ca = {
	sizeof(struct mfb_softc), mfbmatch, mfbattach,
};

static void mfb_common_init __P((struct rasops_info *));
static struct rasops_info mfb_console_ri;
static tc_addr_t mfb_consaddr;

static struct wsscreen_descr mfb_stdscreen = {
	"std", 0, 0,
	0, /* textops */
	0, 0,
	WSSCREEN_REVERSE
};

static const struct wsscreen_descr *_mfb_scrlist[] = {
	&mfb_stdscreen,
};

static const struct wsscreen_list mfb_screenlist = {
	sizeof(_mfb_scrlist) / sizeof(struct wsscreen_descr *), _mfb_scrlist
};

static int	mfbioctl __P((void *, u_long, caddr_t, int, struct proc *));
static paddr_t	mfbmmap __P((void *, off_t, int));

static int	mfb_alloc_screen __P((void *, const struct wsscreen_descr *,
				      void **, int *, int *, long *));
static void	mfb_free_screen __P((void *, void *));
static int	mfb_show_screen __P((void *, void *, int,
				     void (*) (void *, int, int), void *));

static const struct wsdisplay_accessops mfb_accessops = {
	mfbioctl,
	mfbmmap,
	mfb_alloc_screen,
	mfb_free_screen,
	mfb_show_screen,
	0 /* load_font */
};

int  mfb_cnattach __P((tc_addr_t));
static int  mfbintr __P((void *));
static void mfbhwinit __P((caddr_t));

static int  set_cursor __P((struct mfb_softc *, struct wsdisplay_cursor *));
static int  get_cursor __P((struct mfb_softc *, struct wsdisplay_cursor *));
static void set_curpos __P((struct mfb_softc *, struct wsdisplay_curpos *));

/* bit order reverse */
static const u_int8_t flip[256] = {
	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};

static int
mfbmatch(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct tc_attach_args *ta = aux;

	if (strncmp("PMAG-AA ", ta->ta_modname, TC_ROM_LLEN) != 0)
		return (0);

	return (1);
}

static void
mfbattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct mfb_softc *sc = (struct mfb_softc *)self;
	struct tc_attach_args *ta = aux;
	struct rasops_info *ri;
	struct wsemuldisplaydev_attach_args waa;
	int console;
	volatile register int junk;

	console = (ta->ta_addr == mfb_consaddr);
	if (console) {
		sc->sc_ri = ri = &mfb_console_ri;
		sc->nscreens = 1;
	}
	else {
		MALLOC(ri, struct rasops_info *, sizeof(struct rasops_info),
			M_DEVBUF, M_NOWAIT);
		if (ri == NULL) {
			printf(": can't alloc memory\n");
			return;
		}
		memset(ri, 0, sizeof(struct rasops_info));

		ri->ri_hw = (void *)ta->ta_addr;
		mfb_common_init(ri);
		sc->sc_ri = ri;
	}
	printf(": %dx%d, 1bpp\n", ri->ri_width, ri->ri_height);

	sc->sc_vaddr = ta->ta_addr;
	sc->sc_cursor.cc_magic.x = MX_MAGIC_X;
	sc->sc_cursor.cc_magic.y = MX_MAGIC_Y;
	sc->sc_blanked = sc->sc_curenb = 0;

	tc_intr_establish(parent, ta->ta_cookie, IPL_TTY, mfbintr, sc);

	/* clear any pending interrupts */
	*(u_int8_t *)((caddr_t)ri->ri_hw + MX_IREQ_OFFSET) = 0;
	junk = *(u_int8_t *)((caddr_t)ri->ri_hw + MX_IREQ_OFFSET);
	*(u_int8_t *)((caddr_t)ri->ri_hw + MX_IREQ_OFFSET) = 1;

	waa.console = console;
	waa.scrdata = &mfb_screenlist;
	waa.accessops = &mfb_accessops;
	waa.accesscookie = sc;

	config_found(self, &waa, wsemuldisplaydevprint);
}

static void
mfb_common_init(ri)
	struct rasops_info *ri;
{
	caddr_t base;
	int cookie;

	base = (caddr_t)ri->ri_hw;

	/* initialize colormap and cursor hardware */
	mfbhwinit(base);

	ri->ri_flg = RI_CENTER | RI_FORCEMONO;
	ri->ri_depth = 8;	/* !! watch out !! */
	ri->ri_width = 1280;
	ri->ri_height = 1024;
	ri->ri_stride = 2048;
	ri->ri_bits = base + MX_FB_OFFSET;

	/* clear the screen */
	memset(ri->ri_bits, 0, ri->ri_stride * ri->ri_height);

	wsfont_init();
	/* prefer 12 pixel wide font */
	cookie = wsfont_find(NULL, 12, 0, 0, WSDISPLAY_FONTORDER_L2R,
	    WSDISPLAY_FONTORDER_L2R);
	if (cookie <= 0)
		cookie = wsfont_find(NULL, 0, 0, 0, WSDISPLAY_FONTORDER_L2R,
		    WSDISPLAY_FONTORDER_L2R);
	if (cookie <= 0) {
		printf("mfb: font table is empty\n");
		return;
	}

	if (wsfont_lock(cookie, &ri->ri_font)) {
		printf("mfb: couldn't lock font\n");
		return;
	}
	ri->ri_wsfcookie = cookie;

	rasops_init(ri, 34, 80);

	/* XXX shouldn't be global */
	mfb_stdscreen.nrows = ri->ri_rows;
	mfb_stdscreen.ncols = ri->ri_cols;
	mfb_stdscreen.textops = &ri->ri_ops;
	mfb_stdscreen.capabilities = ri->ri_caps;
}

static int
mfbioctl(v, cmd, data, flag, p)
	void *v;
	u_long cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	struct mfb_softc *sc = v;
	struct rasops_info *ri = sc->sc_ri;
	int turnoff;

	switch (cmd) {
	case WSDISPLAYIO_GTYPE:
		*(u_int *)data = WSDISPLAY_TYPE_MFB;
		return (0);

	case WSDISPLAYIO_GINFO:
#define	wsd_fbip ((struct wsdisplay_fbinfo *)data)
		wsd_fbip->height = ri->ri_height;
		wsd_fbip->width = ri->ri_width;
		wsd_fbip->depth = ri->ri_depth;
		wsd_fbip->cmsize = 0;
#undef fbt
		return (0);

	case WSDISPLAYIO_GETCMAP:
	case WSDISPLAYIO_PUTCMAP:
		return (EPASSTHROUGH);

	case WSDISPLAYIO_SVIDEO:
		turnoff = *(int *)data == WSDISPLAYIO_VIDEO_OFF;
		if ((sc->sc_blanked == 0) ^ turnoff) {
			sc->sc_blanked = turnoff;
#if 0	/* XXX later XXX */
	To turn off,
	- assign Bt455 cmap[1].green with value 0 (black),
	- assign Bt431 register #0 with value 0x04 to hide sprite cursor.
#endif	/* XXX XXX XXX */
		}
		return (0);

	case WSDISPLAYIO_GVIDEO:
		*(u_int *)data = sc->sc_blanked ?
		    WSDISPLAYIO_VIDEO_OFF : WSDISPLAYIO_VIDEO_ON;
		return (0);

	case WSDISPLAYIO_GCURPOS:
		*(struct wsdisplay_curpos *)data = sc->sc_cursor.cc_pos;
		return (0);

	case WSDISPLAYIO_SCURPOS:
		set_curpos(sc, (struct wsdisplay_curpos *)data);
		sc->sc_changed = WSDISPLAY_CURSOR_DOPOS;
		return (0);

	case WSDISPLAYIO_GCURMAX:
		((struct wsdisplay_curpos *)data)->x =
		((struct wsdisplay_curpos *)data)->y = CURSOR_MAX_SIZE;
		return (0);

	case WSDISPLAYIO_GCURSOR:
		return get_cursor(sc, (struct wsdisplay_cursor *)data);

	case WSDISPLAYIO_SCURSOR:
		return set_cursor(sc, (struct wsdisplay_cursor *)data);
	}
	return (EPASSTHROUGH);
}

static paddr_t
mfbmmap(v, offset, prot)
	void *v;
	off_t offset;
	int prot;
{
	struct mfb_softc *sc = v;

	if (offset >= MX_FB_SIZE || offset < 0)
		return (-1);
	return machine_btop(sc->sc_vaddr + MX_FB_OFFSET + offset);
}

static int
mfb_alloc_screen(v, type, cookiep, curxp, curyp, attrp)
	void *v;
	const struct wsscreen_descr *type;
	void **cookiep;
	int *curxp, *curyp;
	long *attrp;
{
	struct mfb_softc *sc = v;
	struct rasops_info *ri = sc->sc_ri;
	long defattr;

	if (sc->nscreens > 0)
		return (ENOMEM);

	*cookiep = ri;		 /* one and only for now */
	*curxp = 0;
	*curyp = 0;
	(*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);
	*attrp = defattr;
	sc->nscreens++;
	return (0);
}

static void
mfb_free_screen(v, cookie)
	void *v;
	void *cookie;
{
	struct mfb_softc *sc = v;

	if (sc->sc_ri == &mfb_console_ri)
		panic("mfb_free_screen: console");

	sc->nscreens--;
}

static int
mfb_show_screen(v, cookie, waitok, cb, cbarg)
	void *v;
	void *cookie;
	int waitok;
	void (*cb) __P((void *, int, int));
	void *cbarg;
{

	return (0);
}

/* EXPORT */ int
mfb_cnattach(addr)
	tc_addr_t addr;
{
	struct rasops_info *ri;
	long defattr;

	ri = &mfb_console_ri;
	ri->ri_hw = (void *)addr;
	mfb_common_init(ri);
	(*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);
	wsdisplay_cnattach(&mfb_stdscreen, ri, 0, 0, defattr);
	mfb_consaddr = addr;
	return (0);
}

static int
mfbintr(arg)
	void *arg;
{
	struct mfb_softc *sc = arg;
	caddr_t base, vdac, curs;
	int v;
	volatile register int junk;

	base = (caddr_t)sc->sc_ri->ri_hw;
	junk = *(u_int8_t *)(base + MX_IREQ_OFFSET);
#if 0
	*(u_int8_t *)(base + MX_IREQ_OFFSET) = 0;
#endif
	if (sc->sc_changed == 0)
		goto done;

	vdac = base + MX_BT455_OFFSET;
	curs = base + MX_BT431_OFFSET;
	v = sc->sc_changed;
	if (v & WSDISPLAY_CURSOR_DOCUR) {
		SELECT431(curs, BT431_REG_COMMAND);
		HALF(curs, bt_ctl) = (sc->sc_curenb) ? 0x4444 : 0x0404;
	}
	if (v & (WSDISPLAY_CURSOR_DOPOS | WSDISPLAY_CURSOR_DOHOT)) {
		int x, y;
		u_int16_t twin;

		x = sc->sc_cursor.cc_pos.x - sc->sc_cursor.cc_hot.x;
		y = sc->sc_cursor.cc_pos.y - sc->sc_cursor.cc_hot.y;

		x += sc->sc_cursor.cc_magic.x;
		y += sc->sc_cursor.cc_magic.y;

		SELECT431(curs, BT431_REG_CURSOR_X_LOW);
		HALF(curs, bt_ctl) = TWIN_LO(x);	tc_wmb();
		HALF(curs, bt_ctl) = TWIN_HI(x);	tc_wmb();
		HALF(curs, bt_ctl) = TWIN_LO(y);	tc_wmb();
		HALF(curs, bt_ctl) = TWIN_HI(y);	tc_wmb();
	}
	if (v & WSDISPLAY_CURSOR_DOCMAP) {
		u_int8_t *cp = sc->sc_cursor.cc_color;

		SELECT455(vdac, 8);
		BYTE(vdac, bt_cmap) = 0;	tc_wmb();
		BYTE(vdac, bt_cmap) = cp[1];	tc_wmb();
		BYTE(vdac, bt_cmap) = 0;	tc_wmb();

		BYTE(vdac, bt_cmap) = 0;	tc_wmb();
		BYTE(vdac, bt_cmap) = cp[1];	tc_wmb();
		BYTE(vdac, bt_cmap) = 0;	tc_wmb();

		BYTE(vdac, bt_ovly) = 0;	tc_wmb();
		BYTE(vdac, bt_ovly) = cp[0];	tc_wmb();
		BYTE(vdac, bt_ovly) = 0;	tc_wmb();
	}
	if (v & WSDISPLAY_CURSOR_DOSHAPE) {
		u_int8_t *ip, *mp, img, msk;
		int bcnt;

		ip = (u_int8_t *)sc->sc_cursor.cc_image;
		mp = (u_int8_t *)(sc->sc_cursor.cc_image + CURSOR_MAX_SIZE);
		bcnt = 0;
		SELECT431(curs, BT431_REG_CRAM_BASE);

		/* 64 pixel scan line is consisted with 16 byte cursor ram */
		while (bcnt < sc->sc_cursor.cc_size.y * 16) {
			/* pad right half 32 pixel when smaller than 33 */
			if ((bcnt & 0x8) && sc->sc_cursor.cc_size.x < 33) {
				HALF(curs, bt_ram) = 0;
				tc_wmb();
			}
			else {
				img = *ip++;
				msk = *mp++;
				img &= msk;	/* cookie off image */
				HALF(curs, bt_ram)
				    = (flip[msk] << 8) | flip[img];
				tc_wmb();
			}
			bcnt += 2;
		}
		/* pad unoccupied scan lines */
		while (bcnt < CURSOR_MAX_SIZE * 16) {
			HALF(curs, bt_ram) = 0;
			tc_wmb();
			bcnt += 2;
		}
	}
	sc->sc_changed = 0;
done:
	return (1);
}

static void
mfbhwinit(mfbbase)
	caddr_t mfbbase;
{
	caddr_t vdac, curs;
	int i;

	vdac = mfbbase + MX_BT455_OFFSET;
	curs = mfbbase + MX_BT431_OFFSET;
	SELECT431(curs, BT431_REG_COMMAND);
	HALF(curs, bt_ctl) = 0x0404;		tc_wmb();
	HALF(curs, bt_ctl) = 0; /* XLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* XHI */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* YLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* YHI */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* XWLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* XWHI */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* WYLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* WYLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* WWLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* WWHI */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* WHLO */	tc_wmb();
	HALF(curs, bt_ctl) = 0; /* WHHI */	tc_wmb();

	/* 0: black, 1: white, 8,9: cursor mask, ovly: cursor image */
	SELECT455(vdac, 0);
	BYTE(vdac, bt_cmap) = 0; 		tc_wmb();
	BYTE(vdac, bt_cmap) = 0; 		tc_wmb();
	BYTE(vdac, bt_cmap) = 0;		tc_wmb();
	BYTE(vdac, bt_cmap) = 0;		tc_wmb();
	BYTE(vdac, bt_cmap) = 0xff;		tc_wmb();
	BYTE(vdac, bt_cmap) = 0;		tc_wmb();
	for (i = 2; i < 16; i++) {
		BYTE(vdac, bt_cmap) = 0;	tc_wmb();
		BYTE(vdac, bt_cmap) = 0;	tc_wmb();
		BYTE(vdac, bt_cmap) = 0;	tc_wmb();
	}
	BYTE(vdac, bt_ovly) = 0;	tc_wmb();
	BYTE(vdac, bt_ovly) = 0xff;	tc_wmb();
	BYTE(vdac, bt_ovly) = 0;	tc_wmb();

	SELECT431(curs, BT431_REG_CRAM_BASE);
	for (i = 0; i < 512; i++) {
		HALF(curs, bt_ram) = 0;	tc_wmb();
	}
}

static int
set_cursor(sc, p)
	struct mfb_softc *sc;
	struct wsdisplay_cursor *p;
{
#define	cc (&sc->sc_cursor)
	u_int v, count, index;

	v = p->which;
	if (v & WSDISPLAY_CURSOR_DOCMAP) {
		index = p->cmap.index;
		count = p->cmap.count;
		if (index >= 2 || (index + count) > 2)
			return (EINVAL);
		if (!uvm_useracc(p->cmap.red, count, B_READ))
			return (EFAULT);
	}
	if (v & WSDISPLAY_CURSOR_DOSHAPE) {
		if (p->size.x > CURSOR_MAX_SIZE || p->size.y > CURSOR_MAX_SIZE)
			return (EINVAL);
		count = ((p->size.x < 33) ? 4 : 8) * p->size.y;
		if (!uvm_useracc(p->image, count, B_READ) ||
		    !uvm_useracc(p->mask, count, B_READ))
			return (EFAULT);
	}

	if (v & WSDISPLAY_CURSOR_DOCUR)
		sc->sc_curenb = p->enable;
	if (v & WSDISPLAY_CURSOR_DOPOS)
		set_curpos(sc, &p->pos);
	if (v & WSDISPLAY_CURSOR_DOHOT)
		cc->cc_hot = p->hot;
	if (v & WSDISPLAY_CURSOR_DOCMAP)
		copyin(p->cmap.red, &cc->cc_color[index], count);
	if (v & WSDISPLAY_CURSOR_DOSHAPE) {
		cc->cc_size = p->size;
		memset(cc->cc_image, 0, sizeof cc->cc_image);
		copyin(p->image, cc->cc_image, count);
		copyin(p->mask, cc->cc_image+CURSOR_MAX_SIZE, count);
	}
	sc->sc_changed = v;

	return (0);
#undef cc
}

static int
get_cursor(sc, p)
	struct mfb_softc *sc;
	struct wsdisplay_cursor *p;
{
	return (EPASSTHROUGH); /* XXX */
}

static void
set_curpos(sc, curpos)
	struct mfb_softc *sc;
	struct wsdisplay_curpos *curpos;
{
	struct rasops_info *ri = sc->sc_ri;
	int x = curpos->x, y = curpos->y;

	if (y < 0)
		y = 0;
	else if (y > ri->ri_height)
		y = ri->ri_height;
	if (x < 0)
		x = 0;
	else if (x > ri->ri_width)
		x = ri->ri_width;
	sc->sc_cursor.cc_pos.x = x;
	sc->sc_cursor.cc_pos.y = y;
}