xref: /src/sys/arch/amiga/dev/grf_cv.c

/*	$NetBSD: grf_cv.c,v 1.46.20.1 2009/05/04 08:10:34 yamt Exp $ */

/*
 * Copyright (c) 1995 Michael Teske
 * 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 Ezra Story, by Kari
 *      Mettinen, Michael Teske and by Bernd Ernesti.
 * 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 "opt_amigacons.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: grf_cv.c,v 1.46.20.1 2009/05/04 08:10:34 yamt Exp $");

#include "grfcv.h"
#if NGRFCV > 0

/*
 * Graphics routines for the CyberVision 64 board, using the S3 Trio64.
 *
 * Modified for CV64 from
 * Kari Mettinen's Cirrus driver by Michael Teske 10/95
 *
 * Thanks to Tekelec Airtronic for providing me with a S3 Trio64 documentation.
 * Thanks to Bernd 'the fabulous bug-finder' Ernesti for bringing my messy
 * source to NetBSD style :)
 * Thanks to Harald Koenig for providing information about undocumented
 * Trio64 Bugs.
 */

#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <machine/cpu.h>
#include <dev/cons.h>
#include <amiga/dev/itevar.h>
#include <amiga/amiga/device.h>
#include <amiga/amiga/isr.h>
#include <amiga/dev/grfioctl.h>
#include <amiga/dev/grfvar.h>
#include <amiga/dev/grf_cvreg.h>
#include <amiga/dev/zbusvar.h>

/*
 * finish all bus operations, flush pipelines
 * XXX is this really needed?
 */
#if defined(__m68k__)
#define cpu_sync() __asm volatile ("nop")
#elif defined(__powerpc__)
#define cpu_sync() __asm volatile ("sync; isync")
#endif

int	grfcvmatch(struct device *, struct cfdata *, void *);
void	grfcvattach(struct device *, struct device *, void *);
int	grfcvprint(void *, const char *);

int	cvintr(void *);
static int cv_has_4mb(volatile void *);
static unsigned short cv_compute_clock(unsigned long);
void	cv_boardinit(struct grf_softc *);
int	cv_getvmode(struct grf_softc *, struct grfvideo_mode *);
int	cv_setvmode(struct grf_softc *, unsigned int);
int	cv_blank(struct grf_softc *, int *);
int	cv_mode(register struct grf_softc *, u_long, void *, u_long, int);
int	cv_ioctl(register struct grf_softc *gp, u_long cmd, void *data);
int	cv_setmonitor(struct grf_softc *, struct grfvideo_mode *);
int	cv_getcmap(struct grf_softc *, struct grf_colormap *);
int	cv_putcmap(struct grf_softc *, struct grf_colormap *);
int	cv_toggle(struct grf_softc *);
int	cv_mondefok(struct grfvideo_mode *);
int	cv_load_mon(struct grf_softc *, struct grfcvtext_mode *);
void	cv_inittextmode(struct grf_softc *);
static	inline void cv_write_port(unsigned short, volatile void *);
static	inline void cvscreen(int, volatile void *);
static	inline void gfx_on_off(int, volatile void *);

#ifndef CV_NO_HARDWARE_CURSOR
int	cv_getspritepos(struct grf_softc *, struct grf_position *);
int	cv_setspritepos(struct grf_softc *, struct grf_position *);
int	cv_getspriteinfo(struct grf_softc *,struct grf_spriteinfo *);
void	cv_setup_hwc(struct grf_softc *);
int	cv_setspriteinfo(struct grf_softc *,struct grf_spriteinfo *);
int	cv_getspritemax(struct grf_softc *,struct grf_position *);
#endif	/* !CV_NO_HARDWARE_CURSOR */

/*
 * Extension to grf_softc for interrupt support
 */

struct grf_cv_softc {
	struct grf_softc	gcs_sc;
	struct isr		gcs_isr;
};

/* Graphics display definitions.
 * These are filled by 'grfconfig' using GRFIOCSETMON.
 */
#define monitor_def_max 24
static struct grfvideo_mode monitor_def[24] = {
	{0}, {0}, {0}, {0}, {0}, {0}, {0}, {0},
	{0}, {0}, {0}, {0}, {0}, {0}, {0}, {0},
	{0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}
};
static struct grfvideo_mode *monitor_current = &monitor_def[0];
#define MAXPIXELCLOCK 135000000 /* safety */

unsigned char cv_pass_toggle;	/* passthru status tracker */

/* Console display definition.
 *   Default hardcoded text mode.  This grf_cv is set up to
 *   use one text mode only, and this is it.  You may use
 *   grfconfig to change the mode after boot.
 */

/* Console font */
#ifdef KFONT_8X11
#define S3FONT kernel_font_8x11
#define S3FONTY 11
#else
#define S3FONT kernel_font_8x8
#define S3FONTY 8
#endif
extern unsigned char S3FONT[];

/*
 * Define default console mode
 * (Internally, we still have to use hvalues/8!)
 */
struct grfcvtext_mode cvconsole_mode = {
	{255, "", 25000000, 640, 480, 4, 640/8, 680/8, 768/8, 800/8,
	 481, 491, 493, 525, 0},
	8, S3FONTY, 80, 480 / S3FONTY, S3FONT, 32, 255
};

/* Console colors */
unsigned char cvconscolors[16][3] = {	/* background, foreground, hilite */
	/*  R     G     B  */
	{0x30, 0x30, 0x30},
	{0x00, 0x00, 0x00},
	{0x80, 0x00, 0x00},
	{0x00, 0x80, 0x00},
	{0x00, 0x00, 0x80},
	{0x80, 0x80, 0x00},
	{0x00, 0x80, 0x80},
	{0x80, 0x00, 0x80},
	{0xff, 0xff, 0xff},
	{0x40, 0x40, 0x40},
	{0xff, 0x00, 0x00},
	{0x00, 0xff, 0x00},
	{0x00, 0x00, 0xff},
	{0xff, 0xff, 0x00},
	{0x00, 0xff, 0xff},
	{0x00, 0x00, 0xff}
};

static unsigned char clocks[]={
0x13, 0x61, 0x6b, 0x6d, 0x51, 0x69, 0x54, 0x69,
0x4f, 0x68, 0x6b, 0x6b, 0x18, 0x61, 0x7b, 0x6c,
0x51, 0x67, 0x24, 0x62, 0x56, 0x67, 0x77, 0x6a,
0x1d, 0x61, 0x53, 0x66, 0x6b, 0x68, 0x79, 0x69,
0x7c, 0x69, 0x7f, 0x69, 0x22, 0x61, 0x54, 0x65,
0x56, 0x65, 0x58, 0x65, 0x67, 0x66, 0x41, 0x63,
0x27, 0x61, 0x13, 0x41, 0x37, 0x62, 0x6b, 0x4d,
0x23, 0x43, 0x51, 0x49, 0x79, 0x66, 0x54, 0x49,
0x7d, 0x66, 0x34, 0x56, 0x4f, 0x63, 0x1f, 0x42,
0x6b, 0x4b, 0x7e, 0x4d, 0x18, 0x41, 0x2a, 0x43,
0x7b, 0x4c, 0x74, 0x4b, 0x51, 0x47, 0x65, 0x49,
0x24, 0x42, 0x68, 0x49, 0x56, 0x47, 0x75, 0x4a,
0x77, 0x4a, 0x31, 0x43, 0x1d, 0x41, 0x71, 0x49,
0x53, 0x46, 0x29, 0x42, 0x6b, 0x48, 0x1f, 0x41,
0x79, 0x49, 0x6f, 0x48, 0x7c, 0x49, 0x38, 0x43,
0x7f, 0x49, 0x5d, 0x46, 0x22, 0x41, 0x53, 0x45,
0x54, 0x45, 0x55, 0x45, 0x56, 0x45, 0x57, 0x45,
0x58, 0x45, 0x25, 0x41, 0x67, 0x46, 0x5b, 0x45,
0x41, 0x43, 0x78, 0x47, 0x27, 0x41, 0x51, 0x44,
0x13, 0x21, 0x7d, 0x47, 0x37, 0x42, 0x71, 0x46,
0x6b, 0x2d, 0x14, 0x21, 0x23, 0x23, 0x7d, 0x2f,
0x51, 0x29, 0x61, 0x2b, 0x79, 0x46, 0x1d, 0x22,
0x54, 0x29, 0x45, 0x27, 0x7d, 0x46, 0x7f, 0x46,
0x4f, 0x43, 0x2f, 0x41, 0x1f, 0x22, 0x6a, 0x2b,
0x6b, 0x2b, 0x5b, 0x29, 0x7e, 0x2d, 0x65, 0x44,
0x18, 0x21, 0x5e, 0x29, 0x2a, 0x23, 0x45, 0x26,
0x7b, 0x2c, 0x19, 0x21, 0x74, 0x2b, 0x75, 0x2b,
0x51, 0x27, 0x3f, 0x25, 0x65, 0x29, 0x40, 0x25,
0x24, 0x22, 0x41, 0x25, 0x68, 0x29, 0x42, 0x25,
0x56, 0x27, 0x7e, 0x2b, 0x75, 0x2a, 0x1c, 0x21,
0x77, 0x2a, 0x4f, 0x26, 0x31, 0x23, 0x6f, 0x29,
0x1d, 0x21, 0x32, 0x23, 0x71, 0x29, 0x72, 0x29,
0x53, 0x26, 0x69, 0x28, 0x29, 0x22, 0x75, 0x29,
0x6b, 0x28, 0x1f, 0x21, 0x1f, 0x21, 0x6d, 0x28,
0x79, 0x29, 0x2b, 0x22, 0x6f, 0x28, 0x59, 0x26,
0x7c, 0x29, 0x7d, 0x29, 0x38, 0x23, 0x21, 0x21,
0x7f, 0x29, 0x39, 0x23, 0x5d, 0x26, 0x75, 0x28,
0x22, 0x21, 0x77, 0x28, 0x53, 0x25, 0x6c, 0x27,
0x54, 0x25, 0x61, 0x26, 0x55, 0x25, 0x30, 0x22,
0x56, 0x25, 0x63, 0x26, 0x57, 0x25, 0x71, 0x27,
0x58, 0x25, 0x7f, 0x28, 0x25, 0x21, 0x74, 0x27,
0x67, 0x26, 0x40, 0x23, 0x5b, 0x25, 0x26, 0x21,
0x41, 0x23, 0x34, 0x22, 0x78, 0x27, 0x6b, 0x26,
0x27, 0x21, 0x35, 0x22, 0x51, 0x24, 0x7b, 0x27,
0x13, 0x1,  0x13, 0x1,  0x7d, 0x27, 0x4c, 0x9,
0x37, 0x22, 0x5b, 0xb,  0x71, 0x26, 0x5c, 0xb,
0x6b, 0xd,  0x47, 0x23, 0x14, 0x1,  0x4f, 0x9,
0x23, 0x3,  0x75, 0x26, 0x7d, 0xf,  0x1c, 0x2,
0x51, 0x9,  0x59, 0x24, 0x61, 0xb,  0x69, 0x25,
0x79, 0x26, 0x34, 0x5,  0x1d, 0x2,  0x6b, 0x25,
0x54, 0x9,  0x35, 0x5,  0x45, 0x7,  0x6d, 0x25,
0x7d, 0x26, 0x16, 0x1,  0x7f, 0x26, 0x77, 0xd,
0x4f, 0x23, 0x78, 0xd,  0x2f, 0x21, 0x27, 0x3,
0x1f, 0x2,  0x59, 0x9,  0x6a, 0xb,  0x73, 0x25,
0x6b, 0xb,  0x63, 0x24, 0x5b, 0x9,  0x20, 0x2,
0x7e, 0xd,  0x4b, 0x7,  0x65, 0x24, 0x43, 0x22,
0x18, 0x1,  0x6f, 0xb,  0x5e, 0x9,  0x70, 0xb,
0x2a, 0x3,  0x33, 0x4,  0x45, 0x6,  0x60, 0x9,
0x7b, 0xc,  0x19, 0x1,  0x19, 0x1,  0x7d, 0xc,
0x74, 0xb,  0x50, 0x7,  0x75, 0xb,  0x63, 0x9,
0x51, 0x7,  0x23, 0x2,  0x3f, 0x5,  0x1a, 0x1,
0x65, 0x9,  0x2d, 0x3,  0x40, 0x5,  0x0,  0x0,
};


/* Board Address of CV64 */
static volatile void *cv_boardaddr;
static int cv_fbsize;

/*
 * Memory clock (binpatchable).
 * Let's be defensive: 50 MHz runs on all boards I know of.
 * 55 MHz runs on most boards. But you should know what you're doing
 * if you set this flag. Again: This flag may destroy your CV Board.
 * Use it at your own risk!!!
 * Anyway, this doesn't imply that I'm responsible if your board breaks
 * without setting this flag :-).
 */
#ifdef CV_AGGRESSIVE_TIMING
long cv_memclk = 55000000;
#else
long cv_memclk = 50000000;
#endif

/* standard driver stuff */
CFATTACH_DECL(grfcv, sizeof(struct grf_cv_softc),
    grfcvmatch, grfcvattach, NULL, NULL);

static struct cfdata *cfdata;

#define CV_INT_NUM 6	/* CV interrupt Level: #2 or #6 */
#define CV_ULCURSOR 1	/* Underlined Cursor in textmode */

#ifndef CV_NO_HARDWARE_CURSOR

#define HWC_OFF (cv_fbsize - 1024*2)
#define HWC_SIZE 1024

static unsigned short cv_cursor_storage[HWC_SIZE/2];
static short curs_update_flag = 0;

#endif	/* !CV_NO_HARDWARE_CURSOR */

/*
 * Interrupt handler
 * This is used for updating the cursor shape (because it _must not_
 * be changed while cursor is displayed)
 * and maybe later to avoid busy waiting
 * for Vertical Blank and/or gfx engine busy
 */

int
cvintr(void *arg)
{
#ifndef CV_NO_HARDWARE_CURSOR
	volatile unsigned long *csrc, *cdest;
	int i;
#endif
	struct grf_softc *gp = arg;
	volatile void *ba = gp->g_regkva;
	unsigned char test;
	unsigned char cridx; /* Save the cr Register index */

	if (gp == NULL)
		return 0;

	test = vgar(ba, GREG_INPUT_STATUS0_R);

	if (test & 0x80) { /* VR int pending */
		/* Save old CR index */
		cridx = vgar (ba, CRT_ADDRESS);

#if !defined(__m68k__)
		test = RCrt(ba, CRT_ID_END_VER_RETR);
		/* Clear int (bit 4) */
		test &= ~0x10;
		WCrt(ba, CRT_ID_END_VER_RETR, test);
#else
		vgaw(ba, CRT_ADDRESS, CRT_ID_END_VER_RETR);
		__asm volatile("bclr #4,%0@(0x3d5);nop" : : "a" (ba));
#endif

#ifndef CV_NO_HARDWARE_CURSOR
		/* update the hardware cursor, if necessary */
		if (curs_update_flag) {
			csrc = (unsigned long *)cv_cursor_storage;
			cdest = (volatile unsigned long *)
				((volatile char*)gp->g_fbkva + HWC_OFF);
			for (i = 0; i < HWC_SIZE / sizeof(long); i++)
				*cdest++ = *csrc++;
			curs_update_flag = 0;
		}
		/* Reenable int */
#if !defined(__m68k__)
		test |= 0x10;
		WCrt(ba, CRT_ID_END_VER_RETR, test);
#else
		/* I don't trust the optimizer here... */
		__asm volatile("bset #4,%0@(0x3d5);nop" : : "a" (ba));
#endif
		cv_setspritepos (gp, NULL);

		/* Restore the old CR index */
		vgaw(ba, CRT_ADDRESS, cridx);
		cpu_sync();
#endif  /* !CV_NO_HARDWARE_CURSOR */
		return (1);
	}
	return (0);
}

/*
 * Get frambuffer memory size.
 * phase5 didn't provide the bit in CR36,
 * so we have to do it this way.
 * Return 0 for 2MB, 1 for 4MB
 */
static int
cv_has_4mb(volatile void *fb)
{
	volatile unsigned long *testfbw, *testfbr;

	/* write patterns in memory and test if they can be read */
	testfbw = (volatile unsigned long *)fb;
	testfbr = (volatile unsigned long *)((volatile char*)fb + 0x02000000);
	*testfbw = 0x87654321;
	cpu_sync();
	if (*testfbr != 0x87654321)
		return (0);

	/* upper memory region */
	testfbw = (volatile unsigned long *)((volatile char*)fb + 0x00200000);
	testfbr = (volatile unsigned long *)((volatile char*)fb + 0x02200000);
	*testfbw = 0x87654321;
	cpu_sync();
	if (*testfbr != 0x87654321)
		return (0);
	*testfbw = 0xAAAAAAAA;
	cpu_sync();
	if (*testfbr != 0xAAAAAAAA)
		return (0);
	*testfbw = 0x55555555;
	cpu_sync();
	if (*testfbr != 0x55555555)
		return (0);
	return (1);
}

int
grfcvmatch(struct device *pdp, struct cfdata *cfp, void *auxp)
{
#ifdef CV64CONSOLE
	static int cvcons_unit = -1;
#endif
	struct zbus_args *zap;

	zap = auxp;

	if (amiga_realconfig == 0)
#ifdef CV64CONSOLE
		if (cvcons_unit != -1)
#endif
			 return (0);

	/* Lets be Paranoid: Test man and prod id */
	if (zap->manid != 8512 || zap->prodid != 34)
		return (0);

	cv_boardaddr = zap->va;

#ifdef CV64CONSOLE
	if (amiga_realconfig == 0) {
		cvcons_unit = cfp->cf_unit;
		cfdata = cfp;
	}
#endif

	return (1);
}

void
grfcvattach(struct device *pdp, struct device *dp, void *auxp)
{
	static struct grf_cv_softc congrf;
	struct zbus_args *zap;
	struct grf_softc *gp;
	struct grf_cv_softc *gcp;
	static char attachflag = 0;

	zap = auxp;

	/*
	 * This function is called twice, once on console init (dp == NULL)
	 * and once on "normal" grf5 init.
	 */

	if (dp == NULL) /* console init */
		gcp = &congrf;
	else
		gcp = (struct grf_cv_softc *)dp;

	gp = &gcp->gcs_sc;

	if (dp != NULL && congrf.gcs_sc.g_regkva != 0) {
		/*
		 * inited earlier, just copy (not device struct)
		 */

		printf("\n");
		memcpy( &gp->g_display, &congrf.gcs_sc.g_display,
			(char *) &gcp->gcs_isr - (char *) &gp->g_display);

		/* ... and transfer the isr */
		gcp->gcs_isr.isr_ipl = CV_INT_NUM;
		gcp->gcs_isr.isr_intr = cvintr;
		gcp->gcs_isr.isr_arg = (void *)gp;

		/* First add new isr */
		add_isr(&gcp->gcs_isr);
		remove_isr(&congrf.gcs_isr);
	} else {
		gp->g_regkva = (volatile char *)cv_boardaddr + 0x02000000;
		gp->g_fbkva = (volatile char *)cv_boardaddr + 0x01400000;

		gp->g_unit = GRF_CV64_UNIT;
		gp->g_mode = cv_mode;
		gp->g_conpri = grfcv_cnprobe();
		gp->g_flags = GF_ALIVE;

		/* add Interrupt Handler */
		gcp->gcs_isr.isr_ipl = CV_INT_NUM;
		gcp->gcs_isr.isr_intr = cvintr;
		gcp->gcs_isr.isr_arg = (void *)gp;
		add_isr(&gcp->gcs_isr);

		/* wakeup the board */
		cv_boardinit(gp);

#ifdef CV64CONSOLE
		grfcv_iteinit(gp);
		(void)cv_load_mon(gp, &cvconsole_mode);
#endif
	}

	/*
	 * attach grf
	 */
	if (amiga_config_found(cfdata, &gp->g_device, gp, grfcvprint)) {
		if (dp != NULL)
			printf("grfcv: CyberVision64 with %dMB being used\n",
			    cv_fbsize/0x100000);
		attachflag = 1;
	} else {
		if (!attachflag)
			/*printf("grfcv unattached!!\n")*/;
	}
}

int
grfcvprint(void *auxp, const char *pnp)
{
	if (pnp)
		aprint_normal("ite at %s: ", pnp);
	return (UNCONF);
}


/*
 * Computes M, N, and R values from
 * given input frequency. It uses a table of
 * precomputed values, to keep CPU time low.
 *
 * The return value consist of:
 * lower byte:  Bits 4-0: N Divider Value
 *	        Bits 5-6: R Value          for e.g. SR10 or SR12
 * higher byte: Bits 0-6: M divider value  for e.g. SR11 or SR13
 */

static unsigned short
cv_compute_clock(unsigned long freq)
{
	static unsigned char *mnr, *save;	/* M, N + R vals */
	unsigned long work_freq, r;
	unsigned short erg;
	long diff, d2;

	if (freq < 12500000 || freq > MAXPIXELCLOCK) {
		printf("grfcv: Illegal clock frequency: %ldMHz\n", freq/1000000);
		printf("grfcv: Using default frequency: 25MHz\n");
		printf("grfcv: See the manpage of grfconfig for more informations.\n");
		freq = 25000000;
	}

	mnr = clocks;	/* there the vals are stored */
	d2 = 0x7fffffff;

	while (*mnr) {	/* mnr vals are 0-terminated */
		work_freq = (0x37EE * (mnr[0] + 2)) / ((mnr[1] & 0x1F) + 2);

		r = (mnr[1] >> 5) & 0x03;
		if (r != 0)
			work_freq=work_freq >> r;	/* r is the freq divider */

		work_freq *= 0x3E8;	/* 2nd part of OSC */

		diff = abs(freq - work_freq);

		if (d2 >= diff) {
			d2 = diff;
			/* In save are the vals for minimal diff */
			save = mnr;
		}
		mnr += 2;
	}
	erg = *((unsigned short *)save);

	return (erg);
}


void
cv_boardinit(struct grf_softc *gp)
{
	volatile void *ba;
	unsigned char test;
	unsigned int clockpar;
	int i;
	struct grfinfo *gi;

	ba = gp->g_regkva;
	/* Reset board */
	for (i = 0; i < 6; i++)
		/* Clear all bits */
		cv_write_port (0xff, (volatile char*)ba - 0x02000000);

	/* Return to operational Mode */
	cv_write_port(0x8004, (volatile char*)ba - 0x02000000);

	/* Wakeup Chip */
	vgaw(ba, SREG_VIDEO_SUBS_ENABLE, 0x10);
	vgaw(ba, SREG_OPTION_SELECT, 0x01);
	vgaw(ba, SREG_VIDEO_SUBS_ENABLE, 0x08);

	vgaw(ba, GREG_MISC_OUTPUT_W, 0x03);

	WCrt(ba, CRT_ID_REGISTER_LOCK_1, 0x48);	/* unlock S3 VGA regs */
	WCrt(ba, CRT_ID_REGISTER_LOCK_2, 0xA5);	/* unlock syscontrol */

	/*
	 * The default board interrupt is #6.
	 * Set the roxxler register to use interrupt #2, not #6.
	 */
#if CV_INT_NUM == 2
	cv_write_port(0x8080, ba - 0x02000000);
#endif

	/* Enable board interrupts */
	cv_write_port(0x8008, (volatile char*)ba - 0x02000000);

	test = RCrt(ba, CRT_ID_SYSTEM_CONFIG);
	test = test | 0x01;	/* enable enhaced register access */
	test = test & 0xEF;	/* clear bit 4, 0 wait state */
	WCrt(ba, CRT_ID_SYSTEM_CONFIG, test);

	/*
	 * bit 1=1: enable enhanced mode functions
	 * bit 4=1: enable linear addressing
	 * bit 5=1: enable MMIO
	 */
	vgaw(ba, ECR_ADV_FUNC_CNTL, 0x31);

	/* enable color mode (bit0), CPU access (bit1), high 64k page (bit5) */
	vgaw(ba, GREG_MISC_OUTPUT_W, 0xe3);

	/* CPU base addr */
	WCrt(ba, CRT_ID_EXT_SYS_CNTL_4, 0x00);

	/* Reset. This does nothing, but everyone does it:) */
	WSeq(ba, SEQ_ID_RESET, 0x03);

	WSeq(ba, SEQ_ID_CLOCKING_MODE, 0x01);	/* 8 Dot Clock */
	WSeq(ba, SEQ_ID_MAP_MASK, 0x0f);	/* Enable write planes */
	WSeq(ba, SEQ_ID_CHAR_MAP_SELECT, 0x00);	/* Character Font */

	WSeq(ba, SEQ_ID_MEMORY_MODE, 0x02);	/* Complete mem access */

	WSeq(ba, SEQ_ID_UNLOCK_EXT, 0x06);	/* Unlock extensions */
	test = RSeq(ba, SEQ_ID_BUS_REQ_CNTL);	/* Bus Request */

	/* enable 4MB fast Page Mode */
	test = test | 1 << 6;
	WSeq(ba, SEQ_ID_BUS_REQ_CNTL, test);
	/* faster LUT write */
	WSeq(ba, SEQ_ID_RAMDAC_CNTL, 0xC0);

	test = RSeq(ba, SEQ_ID_CLKSYN_CNTL_2);	/* Clksyn2 read */

	/* immediately Clkload bit clear */
	test = test & 0xDF;

	/* 2 MCLK Memory Write.... */
	if (cv_memclk >= 55000000)
		test |= 0x80;

	WSeq(ba, SEQ_ID_CLKSYN_CNTL_2, test);

	/* Memory CLK */
	clockpar = cv_compute_clock(cv_memclk);
	test = (clockpar & 0xFF00) >> 8;
	WSeq(ba, SEQ_ID_MCLK_HI, test);		/* PLL N-Divider Value */

	test = clockpar & 0xFF;
	WSeq(ba, SEQ_ID_MCLK_LO, test);		/* PLL M-Divider Value */

	if (RCrt(ba, CRT_ID_REVISION) == 0x10)	/* bugfix for new S3 chips */
		WSeq(ba, SEQ_ID_MORE_MAGIC, test);

	/* We now load an 25 MHz, 31 kHz, 640x480 standard VGA Mode. */
	/* DCLK */
	WSeq(ba, SEQ_ID_DCLK_HI, 0x13);
	WSeq(ba, SEQ_ID_DCLK_LO, 0x41);

	test = RSeq (ba, SEQ_ID_CLKSYN_CNTL_2);
	test = test | 0x22;

	/* DCLK + MCLK Clock immediate load! */
	WSeq(ba,SEQ_ID_CLKSYN_CNTL_2, test);

	/* DCLK load */
	test = vgar(ba, 0x3cc);
	test = test | 0x0c;
	vgaw(ba, 0x3c2, test);

	/* Clear bit 5 again, prevent further loading. */
	WSeq(ba, SEQ_ID_CLKSYN_CNTL_2, 0x02);

	WCrt(ba, CRT_ID_HOR_TOTAL, 0x5F);
	WCrt(ba, CRT_ID_HOR_DISP_ENA_END, 0x4F);
	WCrt(ba, CRT_ID_START_HOR_BLANK, 0x50);
	WCrt(ba, CRT_ID_END_HOR_BLANK, 0x82);
	WCrt(ba, CRT_ID_START_HOR_RETR, 0x54);
	WCrt(ba, CRT_ID_END_HOR_RETR, 0x80);
	WCrt(ba, CRT_ID_VER_TOTAL, 0xBF);

	WCrt(ba, CRT_ID_OVERFLOW, 0x1F);	/* overflow reg */

	WCrt(ba, CRT_ID_PRESET_ROW_SCAN, 0x00);	/* no panning */

	WCrt(ba, CRT_ID_MAX_SCAN_LINE, 0x40);	/* vscan */

	WCrt(ba, CRT_ID_CURSOR_START, 0x00);
	WCrt(ba, CRT_ID_CURSOR_END, 0x00);

	/* Display start address */
	WCrt(ba, CRT_ID_START_ADDR_HIGH, 0x00);
	WCrt(ba, CRT_ID_START_ADDR_LOW, 0x00);

	/* Cursor location */
	WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
	WCrt(ba, CRT_ID_CURSOR_LOC_LOW, 0x00);

	/* Vertical retrace */
	WCrt(ba, CRT_ID_START_VER_RETR, 0x9C);
	WCrt(ba, CRT_ID_END_VER_RETR, 0x0E);

	WCrt(ba, CRT_ID_VER_DISP_ENA_END, 0x8F);
	WCrt(ba, CRT_ID_SCREEN_OFFSET, 0x50);

	WCrt(ba, CRT_ID_UNDERLINE_LOC, 0x00);

	WCrt(ba, CRT_ID_START_VER_BLANK, 0x96);
	WCrt(ba, CRT_ID_END_VER_BLANK, 0xB9);

	WCrt(ba, CRT_ID_MODE_CONTROL, 0xE3);

	WCrt(ba, CRT_ID_LINE_COMPARE, 0xFF);

	WCrt(ba, CRT_ID_BACKWAD_COMP_3, 0x10);	/* FIFO enabled */

	/* Refresh count 1, High speed text font, enhanced color mode */
	WCrt(ba, CRT_ID_MISC_1, 0x35);

	/* start fifo position */
	WCrt(ba, CRT_ID_DISPLAY_FIFO, 0x5a);

	WCrt(ba, CRT_ID_EXT_MEM_CNTL_2, 0x70);

	/* address window position */
	WCrt(ba, CRT_ID_LAW_POS_LO, 0x40);

	/* N Parameter for Display FIFO */
	WCrt(ba, CRT_ID_EXT_MEM_CNTL_3, 0xFF);

	WGfx(ba, GCT_ID_SET_RESET, 0x00);
	WGfx(ba, GCT_ID_ENABLE_SET_RESET, 0x00);
	WGfx(ba, GCT_ID_COLOR_COMPARE, 0x00);
	WGfx(ba, GCT_ID_DATA_ROTATE, 0x00);
	WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x00);
	WGfx(ba, GCT_ID_GRAPHICS_MODE, 0x40);
	WGfx(ba, GCT_ID_MISC, 0x01);
	WGfx(ba, GCT_ID_COLOR_XCARE, 0x0F);
	WGfx(ba, GCT_ID_BITMASK, 0xFF);

	/* colors for text mode */
	for (i = 0; i <= 0xf; i++)
		WAttr (ba, i, i);

	WAttr(ba, ACT_ID_ATTR_MODE_CNTL, 0x41);
	WAttr(ba, ACT_ID_OVERSCAN_COLOR, 0x01);
	WAttr(ba, ACT_ID_COLOR_PLANE_ENA, 0x0F);
	WAttr(ba, ACT_ID_HOR_PEL_PANNING, 0x00);
	WAttr(ba, ACT_ID_COLOR_SELECT, 0x00);

	vgaw(ba, VDAC_MASK, 0xFF);	/* DAC Mask */

	*((volatile unsigned long *)((volatile char*)ba + ECR_FRGD_COLOR)) = 0xFF;
	*((volatile unsigned long *)((volatile char*)ba + ECR_BKGD_COLOR)) = 0;

	/* colors initially set to greyscale */

	vgaw(ba, VDAC_ADDRESS_W, 0);
	for (i = 255; i >= 0 ; i--) {
		vgaw(ba, VDAC_DATA, i);
		vgaw(ba, VDAC_DATA, i);
		vgaw(ba, VDAC_DATA, i);
	}

	/* GFx hardware cursor off */
	WCrt(ba, CRT_ID_HWGC_MODE, 0x00);

	/* Set first to 4 MB, so test will work */
	WCrt(ba, CRT_ID_LAW_CNTL, 0x13);

	/* find *correct* fbsize of z3 board */
	if (cv_has_4mb((volatile char *)cv_boardaddr + 0x01400000)) {
		cv_fbsize = 1024 * 1024 * 4;
		WCrt(ba, CRT_ID_LAW_CNTL, 0x13); /* 4 MB */
	} else {
		cv_fbsize = 1024 * 1024 * 2;
		WCrt(ba, CRT_ID_LAW_CNTL, 0x12); /* 2 MB */
	}

	/* Initialize graphics engine */
	GfxBusyWait(ba);
	vgaw16(ba, ECR_FRGD_MIX, 0x27);
	vgaw16(ba, ECR_BKGD_MIX, 0x07);

	vgaw16(ba, ECR_READ_REG_DATA, 0x1000);
	delay(200000);
	vgaw16(ba, ECR_READ_REG_DATA, 0x2000);
	GfxBusyWait(ba);
	vgaw16(ba, ECR_READ_REG_DATA, 0x3fff);
	GfxBusyWait(ba);
	delay(200000);
	vgaw16(ba, ECR_READ_REG_DATA, 0x4fff);
	GfxBusyWait(ba);

	vgaw16(ba, ECR_BITPLANE_WRITE_MASK, ~0);

	GfxBusyWait (ba);
	vgaw16(ba, ECR_READ_REG_DATA, 0xe000);
	vgaw16(ba, ECR_CURRENT_Y_POS2, 0x00);
	vgaw16(ba, ECR_CURRENT_X_POS2, 0x00);
	vgaw16(ba, ECR_READ_REG_DATA, 0xa000);
	vgaw16(ba, ECR_DEST_Y__AX_STEP, 0x00);
	vgaw16(ba, ECR_DEST_Y2__AX_STEP2, 0x00);
	vgaw16(ba, ECR_DEST_X__DIA_STEP, 0x00);
	vgaw16(ba, ECR_DEST_X2__DIA_STEP2, 0x00);
	vgaw16(ba, ECR_SHORT_STROKE, 0x00);
	vgaw16(ba, ECR_DRAW_CMD, 0x01);
	GfxBusyWait (ba);

	/* It ain't easy to write here, so let's do it again */
	vgaw16(ba, ECR_READ_REG_DATA, 0x4fff);

	vgaw16(ba, ECR_BKGD_COLOR, 0x01);
	vgaw16(ba, ECR_FRGD_COLOR, 0x00);

	/* Enable Video Display (Set Bit 5) */
	WAttr(ba, 0x33, 0);

	gi = &gp->g_display;
	gi->gd_regaddr	= (void *) kvtop (__UNVOLATILE(ba));
	gi->gd_regsize	= 64 * 1024;
	gi->gd_fbaddr	= (void *) kvtop (__UNVOLATILE(gp->g_fbkva));
	gi->gd_fbsize	= cv_fbsize;
}


int
cv_getvmode(struct grf_softc *gp, struct grfvideo_mode *vm)
{
	struct grfvideo_mode *gv;

#ifdef CV64CONSOLE
	/* Handle grabbing console mode */
	if (vm->mode_num == 255) {
		memcpy( vm, &cvconsole_mode, sizeof(struct grfvideo_mode));
		/* XXX so grfconfig can tell us the correct text dimensions. */
		vm->depth = cvconsole_mode.fy;
	} else
#endif
	{
		if (vm->mode_num == 0)
			vm->mode_num = (monitor_current - monitor_def) + 1;
		if (vm->mode_num < 1 || vm->mode_num > monitor_def_max)
			return (EINVAL);
		gv = monitor_def + (vm->mode_num - 1);
		if (gv->mode_num == 0)
			return (EINVAL);

		memcpy( vm, gv, sizeof(struct grfvideo_mode));
	}

	/* adjust internal values to pixel values */

	vm->hblank_start *= 8;
	vm->hsync_start *= 8;
	vm->hsync_stop *= 8;
	vm->htotal *= 8;

	return (0);
}


int
cv_setvmode(struct grf_softc *gp, unsigned mode)
{

	if (!mode || (mode > monitor_def_max) ||
	    monitor_def[mode - 1].mode_num == 0)
		return (EINVAL);

	monitor_current = monitor_def + (mode - 1);

	return (0);
}


int
cv_blank(struct grf_softc *gp, int *on)
{
	volatile void *ba;

	ba = gp->g_regkva;
	gfx_on_off(*on > 0 ? 0 : 1, ba);
	return (0);
}


/*
 * Change the mode of the display.
 * Return a UNIX error number or 0 for success.
 */
int
cv_mode(register struct grf_softc *gp, u_long cmd, void *arg, u_long a2,
        int a3)
{
	int error;

	switch (cmd) {
	    case GM_GRFON:
		error = cv_load_mon (gp,
		    (struct grfcvtext_mode *) monitor_current) ? 0 : EINVAL;
		return (error);

	    case GM_GRFOFF:
#ifndef CV64CONSOLE
		cvscreen(1, gp->g_regkva - 0x02000000);
#else
		cv_load_mon(gp, &cvconsole_mode);
		ite_reinit(gp->g_itedev);
#endif
		return (0);

	    case GM_GRFCONFIG:
		return (0);

	    case GM_GRFGETVMODE:
		return (cv_getvmode (gp, (struct grfvideo_mode *) arg));

	    case GM_GRFSETVMODE:
		error = cv_setvmode (gp, *(unsigned *) arg);
		if (!error && (gp->g_flags & GF_GRFON))
			cv_load_mon(gp,
			    (struct grfcvtext_mode *) monitor_current);
		return (error);

	    case GM_GRFGETNUMVM:
		*(int *)arg = monitor_def_max;
		return (0);

	    case GM_GRFIOCTL:
		return (cv_ioctl (gp, a2, arg));

	    default:
		break;
	}

	return (EPASSTHROUGH);
}


int
cv_ioctl(register struct grf_softc *gp, u_long cmd, void *data)
{
	switch (cmd) {
#ifndef CV_NO_HARDWARE_CURSOR
	    case GRFIOCGSPRITEPOS:
		return(cv_getspritepos (gp, (struct grf_position *) data));

	    case GRFIOCSSPRITEPOS:
		return(cv_setspritepos (gp, (struct grf_position *) data));

	    case GRFIOCSSPRITEINF:
		return(cv_setspriteinfo (gp, (struct grf_spriteinfo *) data));

	    case GRFIOCGSPRITEINF:
		return(cv_getspriteinfo (gp, (struct grf_spriteinfo *) data));

	    case GRFIOCGSPRITEMAX:
		return(cv_getspritemax (gp, (struct grf_position *) data));
#else	/* !CV_NO_HARDWARE_CURSOR */
	    case GRFIOCGSPRITEPOS:
	    case GRFIOCSSPRITEPOS:
	    case GRFIOCSSPRITEINF:
	    case GRFIOCGSPRITEINF:
	    case GRFIOCGSPRITEMAX:
		break;
#endif	/* !CV_NO_HARDWARE_CURSOR */

	    case GRFIOCGETCMAP:
		return (cv_getcmap (gp, (struct grf_colormap *) data));

	    case GRFIOCPUTCMAP:
		return (cv_putcmap (gp, (struct grf_colormap *) data));

	    case GRFIOCBITBLT:
		break;

	    case GRFTOGGLE:
		return (cv_toggle (gp));

	    case GRFIOCSETMON:
		return (cv_setmonitor (gp, (struct grfvideo_mode *)data));

	    case GRFIOCBLANK:
		return (cv_blank (gp, (int *)data));
	}
	return (EPASSTHROUGH);
}


int
cv_setmonitor(struct grf_softc *gp, struct grfvideo_mode *gv)
{
	struct grfvideo_mode *md;

	if (!cv_mondefok(gv))
		return (EINVAL);

#ifdef CV64CONSOLE
	/* handle interactive setting of console mode */
	if (gv->mode_num == 255) {
		memcpy( &cvconsole_mode.gv, gv, sizeof(struct grfvideo_mode));
		cvconsole_mode.gv.hblank_start /= 8;
		cvconsole_mode.gv.hsync_start /= 8;
		cvconsole_mode.gv.hsync_stop /= 8;
		cvconsole_mode.gv.htotal /= 8;
		cvconsole_mode.rows = gv->disp_height / cvconsole_mode.fy;
		cvconsole_mode.cols = gv->disp_width / cvconsole_mode.fx;
		if (!(gp->g_flags & GF_GRFON))
			cv_load_mon(gp, &cvconsole_mode);
		ite_reinit(gp->g_itedev);
		return (0);
	}
#endif

	md = monitor_def + (gv->mode_num - 1);

	/*
	 * Prevent user from crashing the system by using
	 * grfconfig while in X
	 */
	if (gp->g_flags & GF_GRFON)
		if (md == monitor_current) {
			printf("grfcv: Changing the used mode not allowed!\n");
			return (EINVAL);
		}

	memcpy( md, gv, sizeof(struct grfvideo_mode));

	/* adjust pixel oriented values to internal rep. */

	md->hblank_start /= 8;
	md->hsync_start /= 8;
	md->hsync_stop /= 8;
	md->htotal /= 8;

	return (0);
}


int
cv_getcmap(struct grf_softc *gfp, struct grf_colormap *cmap)
{
	volatile void *ba;
	u_char red[256], green[256], blue[256], *rp, *gp, *bp;
	short x;
	int error;

	ba = gfp->g_regkva;
	if (cmap->count == 0 || cmap->index >= 256)
		return (0);

	if (cmap->count > 256 - cmap->index)
		cmap->count = 256 - cmap->index;

	/* first read colors out of the chip, then copyout to userspace */
	vgaw (ba, VDAC_ADDRESS_W, cmap->index);
	x = cmap->count - 1;

	rp = red + cmap->index;
	gp = green + cmap->index;
	bp = blue + cmap->index;

	do {
		*rp++ = vgar (ba, VDAC_DATA) << 2;
		*gp++ = vgar (ba, VDAC_DATA) << 2;
		*bp++ = vgar (ba, VDAC_DATA) << 2;
	} while (x-- > 0);

	if (!(error = copyout (red + cmap->index, cmap->red, cmap->count))
	    && !(error = copyout (green + cmap->index, cmap->green, cmap->count))
	    && !(error = copyout (blue + cmap->index, cmap->blue, cmap->count)))
		return (0);

	return (error);
}


int
cv_putcmap(struct grf_softc *gfp, struct grf_colormap *cmap)
{
	volatile void *ba;
	u_char red[256], green[256], blue[256], *rp, *gp, *bp;
	short x;
	int error;

	ba = gfp->g_regkva;
	if (cmap->count == 0 || cmap->index >= 256)
		return (0);

	if (cmap->count > 256 - cmap->index)
		cmap->count = 256 - cmap->index;

	/* first copy the colors into kernelspace */
	if (!(error = copyin (cmap->red, red + cmap->index, cmap->count))
	    && !(error = copyin (cmap->green, green + cmap->index, cmap->count))
	    && !(error = copyin (cmap->blue, blue + cmap->index, cmap->count))) {
		vgaw (ba, VDAC_ADDRESS_W, cmap->index);
		x = cmap->count - 1;

		rp = red + cmap->index;
		gp = green + cmap->index;
		bp = blue + cmap->index;

		do {
			vgaw (ba, VDAC_DATA, *rp++ >> 2);
			vgaw (ba, VDAC_DATA, *gp++ >> 2);
			vgaw (ba, VDAC_DATA, *bp++ >> 2);
		} while (x-- > 0);
		return (0);
	} else
		return (error);
}


int
cv_toggle(struct grf_softc *gp)
{
	volatile void *ba;

	ba = gp->g_regkva;
#ifndef CV64CONSOLE
	cv_pass_toggle = 1;
#endif /* !CV64CONSOLE */

	if (cv_pass_toggle) {
		cvscreen(0, (volatile char*)ba - 0x02000000);
		cv_pass_toggle = 0;
	} else {
		cvscreen(1, (volatile char*)ba - 0x02000000);
		cv_pass_toggle = 1;
	}

	return (0);
}


int
cv_mondefok(struct grfvideo_mode *gv)
{
	unsigned long maxpix;

	if (gv->mode_num < 1 || gv->mode_num > monitor_def_max) {
		if (gv->mode_num != 255 || gv->depth != 4)
			return (0);
	}

	switch(gv->depth) {
	   case 4:
		maxpix = MAXPIXELCLOCK - 55000000;
		break;
	   case 8:
		maxpix = MAXPIXELCLOCK;
		break;
	   case 15:
	   case 16:
#ifdef	CV_AGGRESSIVE_TIMING
		maxpix = MAXPIXELCLOCK - 35000000;
#else
		maxpix = MAXPIXELCLOCK - 55000000;
#endif
		break;
	   case 24:
	   case 32:
#ifdef	CV_AGGRESSIVE_TIMING
		maxpix = MAXPIXELCLOCK - 75000000;
#else
		maxpix = MAXPIXELCLOCK - 85000000;
#endif
		break;
	   default:
		printf("grfcv: Illegal depth in mode %d\n",
			(int) gv->mode_num);
		return (0);
	}

	if (gv->pixel_clock > maxpix) {
		printf("grfcv: Pixelclock too high in mode %d\n",
			(int) gv->mode_num);
		return (0);
	}

	if (gv->mode_num == 255) { /* console mode */
		if ((gv->disp_width / 8) > MAXCOLS) {
			printf ("grfcv: Too many columns for console\n");
			return (0);
		} else if ((gv->disp_height / S3FONTY) > MAXROWS) {
			printf ("grfcv: Too many rows for console\n");
			return (0);
		}
	}

	if (gv->disp_flags & GRF_FLAGS_SYNC_ON_GREEN) {
		printf("grfcv: sync-on-green is not supported\n");
		return (0);
	}

	return (1);
}


int
cv_load_mon(struct grf_softc *gp, struct grfcvtext_mode *md)
{
	struct grfvideo_mode *gv;
	struct grfinfo *gi;
	volatile void *ba, *fb;
	unsigned short mnr;
	unsigned short HT, HDE, HBS, HBE, HSS, HSE, VDE, VBS, VBE, VSS,
		VSE, VT;
	int cr50, sr15, sr18, clock_mode, test;
	int m, n;	/* For calc'ing display FIFO */
	int tfillm, temptym;	/* FIFO fill and empty mclk's */
	int hmul;	/* Multiplier for hor. Values */
	unsigned char hvsync_pulse;
	char TEXT, CONSOLE;

	/* identity */
	gv = &md->gv;

	TEXT = (gv->depth == 4);
	CONSOLE = (gv->mode_num == 255);

	if (!cv_mondefok(gv)) {
		printf("grfcv: Monitor definition not ok\n");
		return (0);
	}

	ba = gp->g_regkva;
	fb = gp->g_fbkva;

	/* Disable Interrupts */
	test = RCrt(ba, CRT_ID_BACKWAD_COMP_1);
	test &= ~0x10;
	WCrt(ba, CRT_ID_BACKWAD_COMP_1, test);

	/* turn gfx off, don't mess up the display */
	gfx_on_off(1, ba);

	/* provide all needed information in grf device-independent locations */
	gp->g_data		= (void *) gv;
	gi = &gp->g_display;
	gi->gd_colors		= 1 << gv->depth;
	gi->gd_planes		= gv->depth;
	gi->gd_fbwidth		= gv->disp_width;
	gi->gd_fbheight		= gv->disp_height;
	gi->gd_fbx		= 0;
	gi->gd_fby		= 0;
	if (CONSOLE) {
		gi->gd_dwidth	= md->fx * md->cols;
		gi->gd_dheight	= md->fy * md->rows;
	} else {
		gi->gd_dwidth	= gv->disp_width;
		gi->gd_dheight	= gv->disp_height;
	}
	gi->gd_dx		= 0;
	gi->gd_dy		= 0;

	/* get display mode parameters */
	switch (gv->depth) {
	    case 15:
	    case 16:
		hmul = 2;
		break;
	    default:
		hmul = 1;
		break;
	}

	HBS = gv->hblank_start * hmul;
	HSS = gv->hsync_start * hmul;
	HSE = gv->hsync_stop * hmul;
	HBE = gv->htotal * hmul - 6;
	HT  = gv->htotal * hmul - 5;
	VBS = gv->vblank_start - 1;
	VSS = gv->vsync_start;
	VSE = gv->vsync_stop;
	VBE = gv->vtotal - 3;
	VT  = gv->vtotal - 2;

	/* Disable enhanced Mode for text display */

	vgaw(ba, ECR_ADV_FUNC_CNTL, (TEXT ? 0x00 : 0x31));

	if (TEXT)
		HDE = ((gv->disp_width + md->fx - 1) / md->fx) - 1;
	else
		HDE = (gv->disp_width + 3) * hmul / 8 - 1; /*HBS;*/
	VDE = gv->disp_height - 1;

	/* adjustments */

	if (gv->disp_flags & GRF_FLAGS_LACE) {
		VDE = VDE / 2;
		VBS = VBS / 2;
		VSS = VSS / 2;
		VSE = VSE / 2;
		VBE = VBE / 2;
		VT  = VT / 2;
	}

	/* Horizontal/Vertical Sync Pulse */
	/*
	 * GREG_MISC_OUTPUT_W Register:
	 * bit	description (0/1)
	 *  0	Monochrome/Color emulation
	 *  1	Disable/Enable access of the display memory from the CPU
	 *  5	Select the low/high 64K page of memory
	 *  6	Select a positive/negative horizontal retrace sync pulse
	 *  7	Select a positive/negative vertical retrace sync pulse
	 */
	hvsync_pulse = vgar(ba, GREG_MISC_OUTPUT_R);
	if (gv->disp_flags & GRF_FLAGS_PHSYNC)
		hvsync_pulse &= ~0x40;
	else
		hvsync_pulse |= 0x40;
	if (gv->disp_flags & GRF_FLAGS_PVSYNC)
		hvsync_pulse &= ~0x80;
	else
		hvsync_pulse |= 0x80;
	vgaw(ba, GREG_MISC_OUTPUT_W, hvsync_pulse);

	/* GFX hardware cursor off */
	WCrt(ba, CRT_ID_HWGC_MODE, 0x00);
	WCrt(ba, CRT_ID_EXT_DAC_CNTL, 0x00);

	WSeq(ba, SEQ_ID_MEMORY_MODE, (TEXT || (gv->depth == 1)) ? 0x06 : 0x0e);
	WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x00);
	WSeq(ba, SEQ_ID_MAP_MASK, (gv->depth == 1) ? 0x01 : 0xff);
	WSeq(ba, SEQ_ID_CHAR_MAP_SELECT, 0x00);

	/* Set clock */

	mnr = cv_compute_clock(gv->pixel_clock);
	WSeq(ba, SEQ_ID_DCLK_HI, ((mnr & 0xFF00) >> 8));
	WSeq(ba, SEQ_ID_DCLK_LO, (mnr & 0xFF));

	/* load display parameters into board */

	WCrt(ba, CRT_ID_EXT_HOR_OVF,
	   ((HT & 0x100) ? 0x01 : 0x00) |
	   ((HDE & 0x100) ? 0x02 : 0x00) |
	   ((HBS & 0x100) ? 0x04 : 0x00) |
	/* ((HBE & 0x40) ? 0x08 : 0x00) | */  /* Later... */
	   ((HSS & 0x100) ? 0x10 : 0x00) |
	/* ((HSE & 0x20) ? 0x20 : 0x00) | */
	   (((HT-5) & 0x100) ? 0x40 : 0x00) );

	WCrt(ba, CRT_ID_EXT_VER_OVF,
	    0x40 |	/* Line compare */
	    ((VT  & 0x400) ? 0x01 : 0x00) |
	    ((VDE & 0x400) ? 0x02 : 0x00) |
	    ((VBS & 0x400) ? 0x04 : 0x00) |
	    ((VSS & 0x400) ? 0x10 : 0x00) );

	WCrt(ba, CRT_ID_HOR_TOTAL, HT);
	WCrt(ba, CRT_ID_DISPLAY_FIFO, HT - 5);

	WCrt(ba, CRT_ID_HOR_DISP_ENA_END, ((HDE >= HBS) ? (HBS - 1) : HDE));
	WCrt(ba, CRT_ID_START_HOR_BLANK, HBS);
	WCrt(ba, CRT_ID_END_HOR_BLANK, ((HBE & 0x1f) | 0x80));
	WCrt(ba, CRT_ID_START_HOR_RETR, HSS);
	WCrt(ba, CRT_ID_END_HOR_RETR,
	    (HSE & 0x1f) |
	    ((HBE & 0x20) ? 0x80 : 0x00) );
	WCrt(ba, CRT_ID_VER_TOTAL, VT);
	WCrt(ba, CRT_ID_OVERFLOW,
	    0x10 |
	    ((VT  & 0x100) ? 0x01 : 0x00) |
	    ((VDE & 0x100) ? 0x02 : 0x00) |
	    ((VSS & 0x100) ? 0x04 : 0x00) |
	    ((VBS & 0x100) ? 0x08 : 0x00) |
	    ((VT  & 0x200) ? 0x20 : 0x00) |
	    ((VDE & 0x200) ? 0x40 : 0x00) |
	    ((VSS & 0x200) ? 0x80 : 0x00) );

	WCrt(ba, CRT_ID_MAX_SCAN_LINE,
	    0x40 |  /* TEXT ? 0x00 ??? */
	    ((gv->disp_flags & GRF_FLAGS_DBLSCAN) ? 0x80 : 0x00) |
	    ((VBS & 0x200) ? 0x20 : 0x00) |
	    (TEXT ? ((md->fy - 1) & 0x1f) : 0x00));

	WCrt(ba, CRT_ID_MODE_CONTROL, 0xe3);

	/* text cursor */

	if (TEXT) {
#if CV_ULCURSOR
		WCrt(ba, CRT_ID_CURSOR_START, (md->fy & 0x1f) - 2);
		WCrt(ba, CRT_ID_CURSOR_END, (md->fy & 0x1f) - 1);
#else
		WCrt(ba, CRT_ID_CURSOR_START, 0x00);
		WCrt(ba, CRT_ID_CURSOR_END, md->fy & 0x1f);
#endif
		WCrt(ba, CRT_ID_UNDERLINE_LOC, (md->fy - 1) & 0x1f);

		WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
		WCrt(ba, CRT_ID_CURSOR_LOC_LOW, 0x00);
	}

	WCrt(ba, CRT_ID_START_ADDR_HIGH, 0x00);
	WCrt(ba, CRT_ID_START_ADDR_LOW, 0x00);

	WCrt(ba, CRT_ID_START_VER_RETR, VSS);
	WCrt(ba, CRT_ID_END_VER_RETR, (VSE & 0x0f));
	WCrt(ba, CRT_ID_VER_DISP_ENA_END, VDE);
	WCrt(ba, CRT_ID_START_VER_BLANK, VBS);
	WCrt(ba, CRT_ID_END_VER_BLANK, VBE);

	WCrt(ba, CRT_ID_LINE_COMPARE, 0xff);
	WCrt(ba, CRT_ID_LACE_RETR_START, HT / 2);
	WCrt(ba, CRT_ID_LACE_CONTROL,
	    ((gv->disp_flags & GRF_FLAGS_LACE) ? 0x20 : 0x00));

	WGfx(ba, GCT_ID_GRAPHICS_MODE,
	    ((TEXT || (gv->depth == 1)) ? 0x00 : 0x40));
	WGfx(ba, GCT_ID_MISC, (TEXT ? 0x04 : 0x01));

	WSeq (ba, SEQ_ID_MEMORY_MODE,
	    ((TEXT || (gv->depth == 1)) ? 0x06 : 0x02));

	vgaw(ba, VDAC_MASK, 0xff);

	/* Blank border */
	test = RCrt(ba, CRT_ID_BACKWAD_COMP_2);
	WCrt(ba, CRT_ID_BACKWAD_COMP_2, (test | 0x20));

	sr15 = RSeq(ba, SEQ_ID_CLKSYN_CNTL_2);
	sr15 &= ~0x10;
	sr18 = RSeq(ba, SEQ_ID_RAMDAC_CNTL);
	sr18 &= ~0x80;
	clock_mode = 0x00;
	cr50 = 0x00;

	test = RCrt(ba, CRT_ID_EXT_MISC_CNTL_2);
	test &= 0xd;

	/* clear roxxler  byte-swapping... */
	cv_write_port(0x0040, cv_boardaddr);
	cv_write_port(0x0020, cv_boardaddr);

	switch (gv->depth) {
	   case 1:
	   case 4: /* text */
		HDE = gv->disp_width / 16;
		break;
	   case 8:
		if (gv->pixel_clock > 80000000) {
			clock_mode = 0x10 | 0x02;
			sr15 |= 0x10;
			sr18 |= 0x80;
		}
		HDE = gv->disp_width / 8;
		cr50 |= 0x00;
		break;
	   case 15:
		cv_write_port (0x8020, cv_boardaddr);
		clock_mode = 0x30;
		HDE = gv->disp_width / 4;
		cr50 |= 0x10;
		break;
	   case 16:
		cv_write_port (0x8020, cv_boardaddr);
		clock_mode = 0x50;
		HDE = gv->disp_width / 4;
		cr50 |= 0x10;
		break;
	   case 24: /* this is really 32 Bit on CV64 */
	   case 32:
		cv_write_port(0x8040, cv_boardaddr);
		clock_mode = 0xd0;
		HDE = (gv->disp_width / 2);
		cr50 |= 0x30;
		break;
	}

	WCrt(ba, CRT_ID_EXT_MISC_CNTL_2, clock_mode | test);
	WSeq(ba, SEQ_ID_CLKSYN_CNTL_2, sr15);
	WSeq(ba, SEQ_ID_RAMDAC_CNTL, sr18);
	WCrt(ba, CRT_ID_SCREEN_OFFSET, HDE);

	WCrt(ba, CRT_ID_MISC_1, (TEXT ? 0x05 : 0x35));

	test = RCrt(ba, CRT_ID_EXT_SYS_CNTL_2);
	test &= ~0x30;
	/* HDE Overflow in bits 4-5 */
	test |= (HDE >> 4) & 0x30;
	WCrt(ba, CRT_ID_EXT_SYS_CNTL_2, test);

	/* Set up graphics engine */
	switch (gv->disp_width) {
	   case 1024:
		cr50 |= 0x00;
		break;
	   case 640:
		cr50 |= 0x40;
		break;
	   case 800:
		cr50 |= 0x80;
		break;
	   case 1280:
		cr50 |= 0xc0;
		break;
	   case 1152:
		cr50 |= 0x01;
		break;
	   case 1600:
		cr50 |= 0x81;
		break;
	   default: /* XXX The Xserver has to handle this */
		break;
	}

	WCrt(ba, CRT_ID_EXT_SYS_CNTL_1, cr50);

	delay(100000);
	WAttr(ba, ACT_ID_ATTR_MODE_CNTL, (TEXT ? 0x08 : 0x41));
	delay(100000);
	WAttr(ba, ACT_ID_COLOR_PLANE_ENA,
	    (gv->depth == 1) ? 0x01 : 0x0f);
	delay(100000);

	/*
	 * M-Parameter of Display FIFO
	 * This is dependant on the pixel clock and the memory clock.
	 * The FIFO filling bandwidth is 240 MHz  and the FIFO is 96 Byte wide.
	 * Then the time to fill the FIFO is tfill = (96/240000000) sec, the time
	 * to empty the FIFO is tempty = (96/pixelclock) sec.
	 * Then the M parameter maximum is ((tempty-tfill)*cv_memclk-9)/2.
	 * This seems to be logical, ain't it?
	 * Remember: We have to use integer arithmetics :(
	 * Divide by 1000 to prevent overflows.
	 */

	tfillm = (96 * (cv_memclk/1000))/240000;

	switch(gv->depth) {
	    case 32:
	    case 24:
		temptym = (24 * (cv_memclk/1000)) / (gv->pixel_clock/1000);
		break;
	    case 15:
	    case 16:
		temptym = (48 * (cv_memclk/1000)) / (gv->pixel_clock/1000);
		break;
	    case 4:
		temptym = (192 * (cv_memclk/1000)) / (gv->pixel_clock/1000);
		break;
	    default:
		temptym = (96 * (cv_memclk/1000)) / (gv->pixel_clock/1000);
		break;
	}

	m = (temptym - tfillm - 9) / 2;
	if (m < 0)
		m = 0;	/* prevent underflow */
	m = (m & 0x1f) << 3;
	if (m < 0x18)
		m = 0x18;
	n = 0xff;

	WCrt(ba, CRT_ID_EXT_MEM_CNTL_2, m);
	WCrt(ba, CRT_ID_EXT_MEM_CNTL_3, n);
	delay(10000);

	/* text initialization */

	if (TEXT) {
		cv_inittextmode(gp);
	}

	if (CONSOLE) {
		int i;
		vgaw(ba, VDAC_ADDRESS_W, 0);
		for (i = 0; i < 16; i++) {
			vgaw(ba, VDAC_DATA, cvconscolors[i][0]);
			vgaw(ba, VDAC_DATA, cvconscolors[i][1]);
			vgaw(ba, VDAC_DATA, cvconscolors[i][2]);
		}
	}

	/* Set display enable flag */
	WAttr(ba, 0x33, 0);

	/* turn gfx on again */
	gfx_on_off(0, ba);

	/* enable interrupts */
	test = RCrt(ba, CRT_ID_BACKWAD_COMP_1);
	test |= 0x10;
	WCrt(ba, CRT_ID_BACKWAD_COMP_1, test);

	test = RCrt(ba, CRT_ID_END_VER_RETR);
	test &= ~0x20;
	WCrt(ba, CRT_ID_END_VER_RETR, test);
	test &= ~0x10;
	WCrt(ba, CRT_ID_END_VER_RETR, test);
	test |= 0x10;
	WCrt(ba, CRT_ID_END_VER_RETR, test);
#ifndef CV_NO_HARDWARE_CURSOR
	cv_setup_hwc(gp);
#endif

	/* Pass-through */
	cvscreen(0, (volatile char*)ba - 0x02000000);

	return (1);
}


void
cv_inittextmode(struct grf_softc *gp)
{
	struct grfcvtext_mode *tm = (struct grfcvtext_mode *)gp->g_data;
	volatile void *ba, *fb;
	volatile unsigned char *c;
	unsigned char *f, y;
	unsigned short z;

	ba = gp->g_regkva;
	fb = gp->g_fbkva;

	/* load text font into beginning of display memory.
	 * Each character cell is 32 bytes long (enough for 4 planes)
	 * In linear addressing text mode, the memory is organized
	 * so, that the Bytes of all 4 planes are interleaved.
	 * 1st byte plane 0, 1st byte plane 1, 1st byte plane 2,
	 * 1st byte plane 3, 2nd byte plane 0, 2nd byte plane 1,...
	 * The font is loaded in plane 2.
	 */

	c = (volatile unsigned char *) fb;

	/* clear screen */
	for (z = 0; z < tm->cols * tm->rows * 3; z++) {
		*c++ = 0x20;
		*c++ = 0x07;
		*c++ = 0;
		*c++ = 0;
	}

	c = (volatile unsigned char *)fb + (32 * tm->fdstart * 4 + 2);
	f = tm->fdata;
	for (z = tm->fdstart; z <= tm->fdend; z++, c += (32 - tm->fy) * 4)
		for (y = 0; y < tm->fy; y++) {
			*c = *f++;
			c += 4;
		}

	/* print out a little init msg */
	c = (volatile unsigned char *)fb + (tm->cols - 6) * 4;
	*c++ = 'C';
	*c++ = 0x0a;
	c +=2;
	*c++ = 'V';
	*c++ = 0x0b;
	c +=2;
	*c++ = '6';
	*c++ = 0x0c;
	c +=2;
	*c++ = '4';
	*c++ = 0x0d;
}


static inline void
cv_write_port(unsigned short bits, volatile void *BoardAddr)
{
	volatile char *addr;
	static unsigned char CVPortBits = 0;	/* mirror port bits here */

	addr = (volatile char*)BoardAddr + 0x40001;
	if (bits & 0x8000)
		CVPortBits |= bits & 0xFF;	/* Set bits */
	else {
		bits = bits & 0xFF;
		bits = (~bits) & 0xFF ;
		CVPortBits &= bits;	/* Clear bits */
	}

	*addr = CVPortBits;
}


/*
 *  Monitor Switch
 *  0 = CyberVision Signal
 *  1 = Amiga Signal,
 * ba = boardaddr
 */
static inline void
cvscreen(int toggle, volatile void *ba)
{

	if (toggle == 1)
		cv_write_port (0x10, ba);
	else
		cv_write_port (0x8010, ba);
}


/* 0 = on, 1= off */
/* ba= registerbase */
static inline void
gfx_on_off(int toggle, volatile void *ba)
{
	int r;

	toggle &= 0x1;
	toggle = toggle << 5;

	r = RSeq(ba, SEQ_ID_CLOCKING_MODE);
	r &= ~0x20;	/* set Bit 5 to 0 */

	WSeq(ba, SEQ_ID_CLOCKING_MODE, r | toggle);
}


#ifndef CV_NO_HARDWARE_CURSOR

static unsigned char cv_hotx = 0, cv_hoty = 0;
static char cv_cursor_on = 0;

/* Hardware Cursor handling routines */

int
cv_getspritepos(struct grf_softc *gp, struct grf_position *pos)
{
	int hi,lo;
	volatile void *ba = gp->g_regkva;

	hi = RCrt(ba, CRT_ID_HWGC_ORIGIN_Y_HI);
	lo = RCrt(ba, CRT_ID_HWGC_ORIGIN_Y_LO);

	pos->y = (hi << 8) + lo;
	hi = RCrt(ba, CRT_ID_HWGC_ORIGIN_X_HI);
	lo = RCrt(ba, CRT_ID_HWGC_ORIGIN_X_LO);
	pos->x = (hi << 8) + lo;
	return (0);
}


int
cv_setspritepos(struct grf_softc *gp, struct grf_position *pos)
{
	volatile void *ba = gp->g_regkva;
	short x, y;
	static short savex, savey;
	short xoff, yoff;

	if (pos) {
		x = pos->x;
		y = pos->y;
		savex = x;
		savey= y;
	} else { /* restore cursor */
		x = savex;
		y = savey;
	}
	x -= cv_hotx;
	y -= cv_hoty;
	if (x < 0) {
		xoff = ((-x) & 0xFE);
		x = 0;
	} else {
		xoff = 0;
	}

	if (y < 0) {
		yoff = ((-y) & 0xFE);
		y = 0;
	} else {
		yoff = 0;
	}

	WCrt(ba, CRT_ID_HWGC_ORIGIN_X_HI, (x >> 8));
	WCrt(ba, CRT_ID_HWGC_ORIGIN_X_LO, (x & 0xff));

	WCrt(ba, CRT_ID_HWGC_ORIGIN_Y_LO, (y & 0xff));
	WCrt(ba, CRT_ID_HWGC_DSTART_X, xoff);
	WCrt(ba, CRT_ID_HWGC_DSTART_Y, yoff);
	WCrt(ba, CRT_ID_HWGC_ORIGIN_Y_HI, (y >> 8));

	return(0);
}

static inline short
M2I(short val)
{
	return ( ((val & 0xff00) >> 8) | ((val & 0xff) << 8));
}

int
cv_getspriteinfo(struct grf_softc *gp, struct grf_spriteinfo *info)
{
	volatile void *ba, *fb;

	ba = gp->g_regkva;
	fb = gp->g_fbkva;

	if (info->set & GRFSPRSET_ENABLE)
		info->enable = RCrt(ba, CRT_ID_HWGC_MODE) & 0x01;

	if (info->set & GRFSPRSET_POS)
		cv_getspritepos (gp, &info->pos);

#if 0	/* XXX */
	if (info->set & GRFSPRSET_SHAPE) {
		u_char image[512], mask[512];
		volatile u_long *hwp;
		u_char *imp, *mp;
		short row;
		info->size.x = 64;
		info->size.y = 64;
		for (row = 0, hwp = (u_long *)(fb + HWC_OFF),
		    mp = mask, imp = image;
		    row < 64;
		    row++) {
			u_long bp10, bp20, bp11, bp21;
			bp10 = *hwp++;
			bp20 = *hwp++;
			bp11 = *hwp++;
			bp21 = *hwp++;
			M2I (bp10);
			M2I (bp20);
			M2I (bp11);
			M2I (bp21);
			*imp++ = (~bp10) & bp11;
			*imp++ = (~bp20) & bp21;
			*mp++  = (~bp10) | (bp10 & ~bp11);
			*mp++  = (~bp20) & (bp20 & ~bp21);
		}
		copyout (image, info->image, sizeof (image));
		copyout (mask, info->mask, sizeof (mask));
	}
#endif
	return(0);
}


void
cv_setup_hwc(struct grf_softc *gp)
{
	volatile void *ba = gp->g_regkva;
	volatile char *hwc;
	int test;

	if (gp->g_display.gd_planes <= 4)
		cv_cursor_on = 0;	/* don't enable hwc in text modes */
	if (cv_cursor_on == 0)
		return;

	/* reset colour stack */
#if !defined(__m68k__)
	test = RCrt(ba, CRT_ID_HWGC_MODE);
	cpu_sync();
#else
	/* do it in assembler, the above does't seem to work */
	__asm volatile ("moveb #0x45, %1@(0x3d4); \
		moveb %1@(0x3d5),%0" : "=d" (test) : "a" (ba));
#endif

	WCrt (ba, CRT_ID_HWGC_FG_STACK, 0);

	hwc = (volatile char*)ba + CRT_ADDRESS_W;
	*hwc = 0;
	*hwc = 0;

#if !defined(__m68k__)
	test = RCrt(ba, CRT_ID_HWGC_MODE);
	cpu_sync();
#else
	/* do it in assembler, the above does't seem to work */
	__asm volatile ("moveb #0x45, %1@(0x3d4); \
		moveb %1@(0x3d5),%0" : "=d" (test) : "a" (ba));
#endif
	switch (gp->g_display.gd_planes) {
	    case 8:
		WCrt (ba, CRT_ID_HWGC_BG_STACK, 0x1);
		*hwc = 1;
		break;
	    default:
		WCrt (ba, CRT_ID_HWGC_BG_STACK, 0xff);
		*hwc = 0xff;
		*hwc = 0xff;
	}

	test = HWC_OFF / HWC_SIZE;
	WCrt (ba, CRT_ID_HWGC_START_AD_HI, (test >> 8));
	WCrt (ba, CRT_ID_HWGC_START_AD_LO, (test & 0xff));

	WCrt (ba, CRT_ID_HWGC_DSTART_X , 0);
	WCrt (ba, CRT_ID_HWGC_DSTART_Y , 0);

	WCrt (ba, CRT_ID_EXT_DAC_CNTL, 0x10);	/* Cursor X11 Mode */
	/*
	 * Put it into Windoze Mode or you'll see sometimes a white stripe
	 * on the right side (in double clocking modes with a screen bigger
	 * > 1023 pixels).
	 */
	WCrt (ba, CRT_ID_EXT_DAC_CNTL, 0x00);	/* Cursor Windoze Mode */

	WCrt (ba, CRT_ID_HWGC_MODE, 0x01);
}


/*
 * This was the reason why you shouldn't use the HWC in the Kernel:(
 * Obsoleted now by use of interrupts :-)
 */

#define VerticalRetraceWait(ba) \
{ \
	while (vgar(ba, GREG_INPUT_STATUS1_R) == 0x00) ; \
	while ((vgar(ba, GREG_INPUT_STATUS1_R) & 0x08) == 0x08) ; \
	while ((vgar(ba, GREG_INPUT_STATUS1_R) & 0x08) == 0x00) ; \
}


int
cv_setspriteinfo(struct grf_softc *gp, struct grf_spriteinfo *info)
{
	volatile void *ba, *fb;
	int depth = gp->g_display.gd_planes;

	ba = gp->g_regkva;
	fb = gp->g_fbkva;

	if (info->set & GRFSPRSET_SHAPE) {
		/*
		 * For an explanation of these weird actions here, see above
		 * when reading the shape.  We set the shape directly into
		 * the video memory, there's no reason to keep 1k on the
		 * kernel stack just as template
		 */
		u_char *image, *mask;
		volatile u_short *hwp;
		u_char *imp, *mp;
		unsigned short row;

#ifdef CV_NO_INT
		/* Cursor off */
		WCrt (ba, CRT_ID_HWGC_MODE, 0x00);

		/*
		 * The Trio64 crashes if the cursor data is written
		 * while the cursor is displayed.
		 * Sadly, turning the cursor off is not enough.
		 * What we have to do is:
		 * 1. Wait for vertical retrace, to make sure no-one
		 * has moved the cursor in this sync period (because
		 * another write then would have no effect, argh!).
		 * 2. Move the cursor off-screen
		 * 3. Another wait for v. retrace to make sure the cursor
		 * is really off.
		 * 4. Write the data, finally.
		 * (thanks to Harald Koenig for this tip!)
		 */

		/*
		 * Remark 06/06/96: Update in interrupt obsoletes this,
		 * but the warning should stay there!
		 */

		VerticalRetraceWait(ba);

		WCrt (ba, CRT_ID_HWGC_ORIGIN_X_HI, 0x7);
		WCrt (ba, CRT_ID_HWGC_ORIGIN_X_LO,  0xff);
		WCrt (ba, CRT_ID_HWGC_ORIGIN_Y_LO, 0xff);
		WCrt (ba, CRT_ID_HWGC_DSTART_X, 0x3f);
		WCrt (ba, CRT_ID_HWGC_DSTART_Y, 0x3f);
		WCrt (ba, CRT_ID_HWGC_ORIGIN_Y_HI, 0x7);
#endif	/* CV_NO_INT */

		if (info->size.y > 64)
			info->size.y = 64;
		if (info->size.x > 64)
			info->size.x = 64;
		if (info->size.x < 32)
			info->size.x = 32;

		image = malloc(HWC_SIZE, M_TEMP, M_WAITOK);
		mask  = image + HWC_SIZE/2;

		copyin(info->image, image, info->size.y * info->size.x / 8);
		copyin(info->mask, mask, info->size.y * info->size.x / 8);

#ifdef CV_NO_INT
		hwp = (u_short *)(fb  +HWC_OFF);

		/* This is necessary in order not to crash the board */
		VerticalRetraceWait(ba);
#else	/* CV_NO_INT */
		hwp = (u_short *) cv_cursor_storage;
#endif	/* CV_NO_INT */

		/*
		 * setting it is slightly more difficult, because we can't
		 * force the application to not pass a *smaller* than
		 * supported bitmap
		 */

		for (row = 0, mp = mask, imp = image;
		    row < info->size.y; row++) {
			u_short im1, im2, im3, im4, m1, m2, m3, m4;

			m1  = ~(*(unsigned short *)mp);
			im1 = *(unsigned short *)imp & *(unsigned short *)mp;
			mp  += 2;
			imp += 2;

			m2  = ~(*(unsigned short *)mp);
			im2 = *(unsigned short *)imp & *(unsigned short *)mp;
			mp  += 2;
			imp += 2;

			if (info->size.x > 32) {
				m3  = ~(*(unsigned short *)mp);
				im3 = *(unsigned short *)imp & *(unsigned short *)mp;
				mp  += 2;
				imp += 2;
				m4  = ~(*(unsigned short *)mp);
				im4 = *(unsigned short *)imp & *(unsigned short *)mp;
				mp  += 2;
				imp += 2;
			} else {
				m3  = 0xffff;
				im3 = 0;
				m4  = 0xffff;
				im4 = 0;
			}

			switch (depth) {
			    case 8:
				*hwp++ = m1;
				*hwp++ = im1;
				*hwp++ = m2;
				*hwp++ = im2;
				*hwp++ = m3;
				*hwp++ = im3;
				*hwp++ = m4;
				*hwp++ = im4;
				break;
			    case 15:
			    case 16:
				*hwp++ = M2I(m1);
				*hwp++ = M2I(im1);
				*hwp++ = M2I(m2);
				*hwp++ = M2I(im2);
				*hwp++ = M2I(m3);
				*hwp++ = M2I(im3);
				*hwp++ = M2I(m4);
				*hwp++ = M2I(im4);
				break;
			    case 24:
			    case 32:
				*hwp++ = M2I(im1);
				*hwp++ = M2I(m1);
				*hwp++ = M2I(im2);
				*hwp++ = M2I(m2);
				*hwp++ = M2I(im3);
				*hwp++ = M2I(m3);
				*hwp++ = M2I(im4);
				*hwp++ = M2I(m4);
				break;
			}
		}

		if (depth < 24) {
			for (; row < 64; row++) {
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
			}
		} else {
			for (; row < 64; row++) {
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
				*hwp++ = 0x0000;
				*hwp++ = 0xffff;
			}
		}

		free(image, M_TEMP);
		/* cv_setup_hwc(gp); */
		cv_hotx = info->hot.x;
		cv_hoty = info->hot.y;

#ifdef CV_NO_INT
		/* One must not write twice per vertical blank :-( */
		VerticalRetraceWait(ba);
		cv_setspritepos (gp, &info->pos);
#else	/* CV_NO_INT */
		cv_setspritepos (gp, &info->pos);
		curs_update_flag = 1;
#endif	/* CV_NO_INT */
	}
	if (info->set & GRFSPRSET_CMAP) {
		volatile char *hwc;
		int test;

		/* reset colour stack */
		test = RCrt(ba, CRT_ID_HWGC_MODE);
		cpu_sync();
		switch (depth) {
		    case 8:
		    case 15:
		    case 16:
			WCrt (ba, CRT_ID_HWGC_FG_STACK, 0);
			hwc = (volatile char*)ba + CRT_ADDRESS_W;
			*hwc = 0;
			break;
		    case 32:
		    case 24:
			WCrt (ba, CRT_ID_HWGC_FG_STACK, 0);
			hwc = (volatile char*)ba + CRT_ADDRESS_W;
			*hwc = 0;
			*hwc = 0;
			break;
		}

		test = RCrt(ba, CRT_ID_HWGC_MODE);
		cpu_sync();
		switch (depth) {
		    case 8:
			WCrt (ba, CRT_ID_HWGC_BG_STACK, 1);
			hwc = (volatile char*)ba + CRT_ADDRESS_W;
			*hwc = 1;
			break;
		    case 15:
		    case 16:
			WCrt (ba, CRT_ID_HWGC_BG_STACK, 0xff);
			hwc = (volatile char*)ba + CRT_ADDRESS_W;
			*hwc = 0xff;
			break;
		    case 32:
		    case 24:
			WCrt (ba, CRT_ID_HWGC_BG_STACK, 0xff);
			hwc = (volatile char*)ba + CRT_ADDRESS_W;
			*hwc = 0xff;
			*hwc = 0xff;
			break;
		}
	}

	if (info->set & GRFSPRSET_ENABLE) {
		if (info->enable) {
			cv_cursor_on = 1;
			cv_setup_hwc(gp);
			/* WCrt(ba, CRT_ID_HWGC_MODE, 0x01); */
		} else
			WCrt(ba, CRT_ID_HWGC_MODE, 0x00);
	}
	if (info->set & GRFSPRSET_POS)
		cv_setspritepos(gp, &info->pos);
	if (info->set & GRFSPRSET_HOT) {

		cv_hotx = info->hot.x;
		cv_hoty = info->hot.y;
		cv_setspritepos (gp, &info->pos);
	}
	return(0);
}


int
cv_getspritemax (struct grf_softc *gp, struct grf_position *pos)
{

	pos->x = 64;
	pos->y = 64;
	return(0);
}

#endif /* !CV_NO_HARDWARE_CURSOR */

#endif  /* NGRFCV */