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      1 /*	$NetBSD: grf.c,v 1.69 2023/12/20 00:40:42 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1990 The Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: grf.c 1.31 91/01/21$
     37  *
     38  *	@(#)grf.c	7.8 (Berkeley) 5/7/91
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: grf.c,v 1.69 2023/12/20 00:40:42 thorpej Exp $");
     43 
     44 /*
     45  * Graphics display driver for the Amiga
     46  * This is the hardware-independent portion of the driver.
     47  * Hardware access is through the grf_softc->g_mode routine.
     48  */
     49 
     50 #include "view.h"
     51 #include "grf.h"
     52 #include "kbd.h"
     53 #include "wsdisplay.h"
     54 
     55 #include <sys/param.h>
     56 #include <sys/proc.h>
     57 #include <sys/ioctl.h>
     58 #include <sys/device.h>
     59 #include <sys/file.h>
     60 #include <sys/systm.h>
     61 #include <sys/vnode.h>
     62 #include <sys/mman.h>
     63 #include <sys/bus.h>
     64 #include <sys/kauth.h>
     65 
     66 #include <machine/cpu.h>
     67 
     68 #include <dev/cons.h>
     69 #include <dev/sun/fbio.h>
     70 #include <dev/wscons/wsconsio.h>
     71 #include <dev/wscons/wsdisplayvar.h>
     72 #include <dev/rasops/rasops.h>
     73 #include <dev/wscons/wsdisplay_vconsvar.h>
     74 
     75 #include <amiga/amiga/color.h>	/* DEBUG */
     76 #include <amiga/amiga/device.h>
     77 #include <amiga/dev/grfioctl.h>
     78 #include <amiga/dev/grfvar.h>
     79 #include <amiga/dev/itevar.h>
     80 #include <amiga/dev/kbdvar.h>
     81 #include <amiga/dev/viewioctl.h>
     82 
     83 #include <sys/conf.h>
     84 
     85 #if NGRF > 0
     86 #include "ite.h"
     87 #if NITE == 0
     88 #define	ite_on(u,f)
     89 #define	ite_off(u,f)
     90 #define ite_reinit(d)
     91 #endif
     92 
     93 int grfon(dev_t);
     94 int grfoff(dev_t);
     95 int grfsinfo(dev_t, struct grfdyninfo *);
     96 
     97 void grfattach(device_t, device_t, void *);
     98 int grfmatch(device_t, cfdata_t, void *);
     99 int grfprint(void *, const char *);
    100 #ifdef DEBUG
    101 void grfdebug(struct grf_softc *, const char *, ...);
    102 #endif
    103 /*
    104  * pointers to grf drivers device structs
    105  */
    106 struct grf_softc *grfsp[NGRF];
    107 
    108 CFATTACH_DECL_NEW(grf, 0,
    109     grfmatch, grfattach, NULL, NULL);
    110 
    111 dev_type_open(grfopen);
    112 dev_type_close(grfclose);
    113 dev_type_ioctl(grfioctl);
    114 dev_type_mmap(grfmmap);
    115 
    116 const struct cdevsw grf_cdevsw = {
    117 	.d_open = grfopen,
    118 	.d_close = grfclose,
    119 	.d_read = nullread,
    120 	.d_write = nullwrite,
    121 	.d_ioctl = grfioctl,
    122 	.d_stop = nostop,
    123 	.d_tty = notty,
    124 	.d_poll = nopoll,
    125 	.d_mmap = grfmmap,
    126 	.d_kqfilter = nokqfilter,
    127 	.d_discard = nodiscard,
    128 	.d_flag = 0
    129 };
    130 
    131 /*
    132  * only used in console init.
    133  */
    134 static cfdata_t cfdata;
    135 
    136 #if NWSDISPLAY > 0
    137 static struct vcons_screen console_vcons;
    138 
    139 static void grf_init_screen(void *, struct vcons_screen *, int, long *);
    140 static struct rasops_info *grf_setup_rasops(struct grf_softc *,
    141     struct vcons_screen *);
    142 
    143 cons_decl(grf);
    144 #endif
    145 
    146 /*
    147  * match if the unit of grf matches its perspective
    148  * low level board driver.
    149  */
    150 int
    151 grfmatch(device_t parent, cfdata_t cf, void *aux)
    152 {
    153 	struct grf_softc *psc;
    154 
    155 	psc = device_private(parent);
    156 	if (cf->cf_unit != psc->g_unit)
    157 		return(0);
    158 	cfdata = cf;
    159 	return(1);
    160 }
    161 
    162 /*
    163  * Attach.. plug pointer in and print some info.
    164  * Then try and attach a wsdisplay or ite to us.
    165  * Note: self is NULL during console init.
    166  */
    167 void
    168 grfattach(device_t parent, device_t self, void *aux)
    169 {
    170 #if NWSDISPLAY > 0
    171 	struct wsemuldisplaydev_attach_args wa;
    172 	long defattr;
    173 #endif
    174 	struct grf_softc *gp;
    175 	int maj;
    176 
    177 	gp = device_private(parent);
    178 	gp->g_device = self;
    179 	grfsp[gp->g_unit] = gp;
    180 
    181 	/*
    182 	 * find our major device number, make device
    183 	 */
    184 	maj = cdevsw_lookup_major(&grf_cdevsw);
    185 	gp->g_grfdev = makedev(maj, gp->g_unit);
    186 
    187 	if (self != NULL) {
    188 		printf(": width %d height %d", gp->g_display.gd_dwidth,
    189 		    gp->g_display.gd_dheight);
    190 		if (gp->g_display.gd_colors == 2)
    191 			printf(" monochrome\n");
    192 		else
    193 			printf(" colors %d\n", gp->g_display.gd_colors);
    194 
    195 #if NWSDISPLAY > 0
    196 		vcons_init(&gp->g_vd, gp, gp->g_defaultscr, gp->g_accessops);
    197 		gp->g_vd.init_screen = grf_init_screen;
    198 
    199 		if (gp->g_flags & GF_CONSOLE) {
    200 			console_vcons.scr_flags |= VCONS_SCREEN_IS_STATIC;
    201 			vcons_init_screen(&gp->g_vd,
    202 			    &console_vcons, 1, &defattr);
    203 			gp->g_defaultscr->textops =
    204 			    &console_vcons.scr_ri.ri_ops;
    205 			wsdisplay_cnattach(gp->g_defaultscr,
    206 			    &console_vcons.scr_ri, 0, 0, defattr);
    207 			vcons_replay_msgbuf(&console_vcons);
    208 		}
    209 
    210 		/* attach wsdisplay */
    211 		wa.console = (gp->g_flags & GF_CONSOLE) != 0;
    212 		wa.scrdata = gp->g_scrlist;
    213 		wa.accessops = gp->g_accessops;
    214 		wa.accesscookie = &gp->g_vd;
    215 		config_found(self, &wa, wsemuldisplaydevprint,
    216 		    CFARGS(.iattr = "wsemuldisplaydev"));
    217 #endif  /* NWSDISPLAY > 0 */
    218 	}
    219 
    220 #if NWSDISPLAY == 0
    221 	/*
    222 	 * try and attach an ite
    223 	 */
    224 	amiga_config_found(cfdata, self, gp, grfprint,
    225 	    CFARGS(.iattr = "grf"));
    226 #endif
    227 }
    228 
    229 int
    230 grfprint(void *aux, const char *pnp)
    231 {
    232 	if (pnp)
    233 		aprint_normal("ite at %s", pnp);
    234 	return(UNCONF);
    235 }
    236 
    237 /*ARGSUSED*/
    238 int
    239 grfopen(dev_t dev, int flags, int devtype, struct lwp *l)
    240 {
    241 	struct grf_softc *gp;
    242 
    243 	if (GRFUNIT(dev) >= NGRF || (gp = grfsp[GRFUNIT(dev)]) == NULL)
    244 		return(ENXIO);
    245 
    246 	if ((gp->g_flags & GF_ALIVE) == 0)
    247 		return(ENXIO);
    248 
    249 	if ((gp->g_flags & (GF_OPEN|GF_EXCLUDE)) == (GF_OPEN|GF_EXCLUDE))
    250 		return(EBUSY);
    251 
    252 	return(0);
    253 }
    254 
    255 /*ARGSUSED*/
    256 int
    257 grfclose(dev_t dev, int flags, int mode, struct lwp *l)
    258 {
    259 	struct grf_softc *gp;
    260 
    261 	gp = grfsp[GRFUNIT(dev)];
    262 	(void)grfoff(dev);
    263 	gp->g_flags &= GF_ALIVE;
    264 	return(0);
    265 }
    266 
    267 /*ARGSUSED*/
    268 int
    269 grfioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    270 {
    271 	struct grf_softc *gp;
    272 	int error;
    273 
    274 	gp = grfsp[GRFUNIT(dev)];
    275 	error = 0;
    276 
    277 	switch (cmd) {
    278 	case OGRFIOCGINFO:
    279 	        /* argl.. no bank-member.. */
    280 	  	memcpy(data, (void *)&gp->g_display, sizeof(struct grfinfo)-4);
    281 		break;
    282 	case GRFIOCGINFO:
    283 		memcpy(data, (void *)&gp->g_display, sizeof(struct grfinfo));
    284 		break;
    285 	case GRFIOCON:
    286 		error = grfon(dev);
    287 		break;
    288 	case GRFIOCOFF:
    289 		error = grfoff(dev);
    290 		break;
    291 	case GRFIOCSINFO:
    292 		error = grfsinfo(dev, (struct grfdyninfo *) data);
    293 		break;
    294 	case GRFGETVMODE:
    295 		return(gp->g_mode(gp, GM_GRFGETVMODE, data, 0, 0));
    296 	case GRFSETVMODE:
    297 		error = gp->g_mode(gp, GM_GRFSETVMODE, data, 0, 0);
    298 		if (error == 0 && gp->g_itedev && !(gp->g_flags & GF_GRFON))
    299 			ite_reinit(gp->g_itedev);
    300 		break;
    301 	case GRFGETNUMVM:
    302 		return(gp->g_mode(gp, GM_GRFGETNUMVM, data, 0, 0));
    303 	/*
    304 	 * these are all hardware dependent, and have to be resolved
    305 	 * in the respective driver.
    306 	 */
    307 	case GRFIOCPUTCMAP:
    308 	case GRFIOCGETCMAP:
    309 	case GRFIOCSSPRITEPOS:
    310 	case GRFIOCGSPRITEPOS:
    311 	case GRFIOCSSPRITEINF:
    312 	case GRFIOCGSPRITEINF:
    313 	case GRFIOCGSPRITEMAX:
    314 	case GRFIOCBITBLT:
    315     	case GRFIOCSETMON:
    316 	case GRFTOGGLE: /* Toggles between Cirrus boards and native ECS on
    317                      Amiga. 15/11/94 ill */
    318 		/*
    319 		 * We need the minor dev number to get the overlay/image
    320 		 * information for grf_ul.
    321 		 */
    322 		return(gp->g_mode(gp, GM_GRFIOCTL, data, cmd, dev));
    323 
    324 	case GRFIOCBLANK:	/* blank ioctl, IOCON/OFF will turn ite on */
    325 	case FBIOSVIDEO:
    326 		error = gp->g_mode(gp, GM_GRFIOCTL, data, GRFIOCBLANK, dev);
    327 		if (!error)
    328 			gp->g_blank = *(int *)data;
    329 		return (error);
    330 
    331 	case FBIOGVIDEO:
    332 		*(int *)data = gp->g_blank;
    333 		return (0);
    334 
    335 	default:
    336 #if NVIEW > 0
    337 		/*
    338 		 * check to see whether it's a command recognized by the
    339 		 * view code if the unit is 0
    340 		 * XXX
    341 		 */
    342 		if (GRFUNIT(dev) == 0) {
    343 			extern const struct cdevsw view_cdevsw;
    344 
    345 			return((*view_cdevsw.d_ioctl)(dev, cmd, data, flag, l));
    346 		}
    347 #endif
    348 		error = EPASSTHROUGH;
    349 		break;
    350 
    351 	}
    352 	return(error);
    353 }
    354 
    355 /*
    356  * map the contents of a graphics display card into process'
    357  * memory space.
    358  */
    359 paddr_t
    360 grfmmap(dev_t dev, off_t off, int prot)
    361 {
    362 	struct grf_softc *gp;
    363 	struct grfinfo *gi;
    364 
    365 	gp = grfsp[GRFUNIT(dev)];
    366 	gi = &gp->g_display;
    367 
    368 	/*
    369 	 * control registers
    370 	 */
    371 	if (off >= 0 && off < gi->gd_regsize)
    372 		return MD_BTOP((paddr_t)gi->gd_regaddr + off);
    373 
    374 	/*
    375 	 * frame buffer
    376 	 */
    377 	if (off >= gi->gd_regsize && off < gi->gd_regsize+gi->gd_fbsize) {
    378 		off -= gi->gd_regsize;
    379 		return MD_BTOP((paddr_t)gi->gd_fbaddr + off);
    380 	}
    381 	/* bogus */
    382 	return(-1);
    383 }
    384 
    385 int
    386 grfon(dev_t dev)
    387 {
    388 	struct grf_softc *gp;
    389 
    390 	gp = grfsp[GRFUNIT(dev)];
    391 
    392 	if (gp->g_flags & GF_GRFON)
    393 		return(0);
    394 
    395 	gp->g_flags |= GF_GRFON;
    396 	if (gp->g_itedev != NODEV)
    397 		ite_off(gp->g_itedev, 3);
    398 
    399 	return(gp->g_mode(gp, (dev & GRFOVDEV) ? GM_GRFOVON : GM_GRFON,
    400 							NULL, 0, 0));
    401 }
    402 
    403 int
    404 grfoff(dev_t dev)
    405 {
    406 	struct grf_softc *gp;
    407 	int error;
    408 
    409 	gp = grfsp[GRFUNIT(dev)];
    410 
    411 	if ((gp->g_flags & GF_GRFON) == 0)
    412 		return(0);
    413 
    414 	gp->g_flags &= ~GF_GRFON;
    415 	error = gp->g_mode(gp, (dev & GRFOVDEV) ? GM_GRFOVOFF : GM_GRFOFF,
    416 							NULL, 0, 0);
    417 
    418 	/*
    419 	 * Closely tied together no X's
    420 	 */
    421 	if (gp->g_itedev != NODEV)
    422 		ite_on(gp->g_itedev, 2);
    423 
    424 	return(error);
    425 }
    426 
    427 int
    428 grfsinfo(dev_t dev, struct grfdyninfo *dyninfo)
    429 {
    430 	struct grf_softc *gp;
    431 	int error;
    432 
    433 	gp = grfsp[GRFUNIT(dev)];
    434 	error = gp->g_mode(gp, GM_GRFCONFIG, dyninfo, 0, 0);
    435 
    436 	/*
    437 	 * Closely tied together no X's
    438 	 */
    439 	if (gp->g_itedev != NODEV)
    440 		ite_reinit(gp->g_itedev);
    441 	return(error);
    442 }
    443 
    444 #if NWSDISPLAY > 0
    445 void
    446 grfcnprobe(struct consdev *cd)
    447 {
    448 	struct grf_softc *gp;
    449 	int unit;
    450 
    451 	/*
    452 	 * Find the first working grf device for being console.
    453 	 * Ignore unit 0 (grfcc), which should use amidisplaycc instead.
    454 	 */
    455 	for (unit = 1; unit < NGRF; unit++) {
    456 		gp = grfsp[unit];
    457 		if (gp != NULL && (gp->g_flags & GF_ALIVE)) {
    458 			cd->cn_pri = CN_INTERNAL;
    459 			cd->cn_dev = NODEV;  /* initialized later by wscons */
    460 			return;
    461 		}
    462 	}
    463 
    464 	/* no grf console alive */
    465 	cd->cn_pri = CN_DEAD;
    466 }
    467 
    468 void
    469 grfcninit(struct consdev *cd)
    470 {
    471 	struct grf_softc *gp;
    472 	struct rasops_info *ri;
    473 	long defattr;
    474 	int unit;
    475 
    476 	/* find console grf and set up wsdisplay for it */
    477 	for (unit = 1; unit < NGRF; unit++) {
    478 		gp = grfsp[unit];
    479 		if (gp != NULL && (gp->g_flags & GF_ALIVE)) {
    480 			gp->g_flags |= GF_CONSOLE;  /* we are console! */
    481 
    482 			gp->g_defaultscr->ncols = gp->g_display.gd_fbwidth /
    483 			    gp->g_defaultscr->fontwidth;
    484 			gp->g_defaultscr->nrows = gp->g_display.gd_fbheight /
    485 			    gp->g_defaultscr->fontheight;
    486 
    487 			ri = grf_setup_rasops(gp, &console_vcons);
    488 			console_vcons.scr_cookie = gp;
    489 			defattr = 0;  /* XXX */
    490 
    491 			wsdisplay_preattach(gp->g_defaultscr, ri, 0, 0,
    492 			    defattr);
    493 #if NKBD > 0
    494 			/* tell kbd device it is used as console keyboard */
    495 			kbd_cnattach();
    496 #endif
    497 			return;
    498 		}
    499 	}
    500 	panic("grfcninit: lost console");
    501 }
    502 
    503 static void
    504 grf_init_screen(void *cookie, struct vcons_screen *scr, int existing,
    505     long *defattr)
    506 {
    507 	struct grf_softc *gp;
    508 	struct rasops_info *ri __unused;
    509 
    510 	gp = cookie;
    511 	ri = grf_setup_rasops(gp, scr);
    512 }
    513 
    514 static struct rasops_info *
    515 grf_setup_rasops(struct grf_softc *gp, struct vcons_screen *scr)
    516 {
    517 	struct rasops_info *ri;
    518 	int i;
    519 
    520 	ri = &scr->scr_ri;
    521 	scr->scr_flags |= VCONS_DONT_READ;
    522 	memset(ri, 0, sizeof(struct rasops_info));
    523 
    524 	ri->ri_rows = gp->g_defaultscr->nrows;
    525 	ri->ri_cols = gp->g_defaultscr->ncols;
    526 	ri->ri_hw = scr;
    527 	ri->ri_ops.cursor    = gp->g_emulops->cursor;
    528 	ri->ri_ops.mapchar   = gp->g_emulops->mapchar;
    529 	ri->ri_ops.copyrows  = gp->g_emulops->copyrows;
    530 	ri->ri_ops.eraserows = gp->g_emulops->eraserows;
    531 	ri->ri_ops.copycols  = gp->g_emulops->copycols;
    532 	ri->ri_ops.erasecols = gp->g_emulops->erasecols;
    533 	ri->ri_ops.putchar   = gp->g_emulops->putchar;
    534 	ri->ri_ops.allocattr = gp->g_emulops->allocattr;
    535 
    536 	/* multiplication table for row-offsets */
    537 	for (i = 0; i < ri->ri_rows; i++)
    538 		gp->g_rowoffset[i] = i * ri->ri_cols;
    539 
    540 	return ri;
    541 }
    542 
    543 /*
    544  * Called as fallback for ioctls which are not handled by the specific
    545  * grf driver.
    546  */
    547 int
    548 grf_wsioctl(void *v, void *vs, u_long cmd, void *data, int flag, struct lwp *l)
    549 {
    550 	struct wsdisplayio_fbinfo *iofbi;
    551 	struct wsdisplay_fbinfo *fbinfo;
    552 	struct vcons_data *vd;
    553 	struct grf_softc *gp;
    554 	struct vcons_screen *scr;
    555 	struct grfinfo *gi;
    556 
    557 	vd = v;
    558 	gp = vd->cookie;
    559 	scr = vd->active;
    560 
    561 	switch (cmd) {
    562 	case WSDISPLAYIO_GET_FBINFO:
    563 		if (scr != NULL) {
    564 			iofbi = data;
    565 			return wsdisplayio_get_fbinfo(&scr->scr_ri, iofbi);
    566 		}
    567 		return ENODEV;
    568 
    569 	case WSDISPLAYIO_GINFO:
    570 		if (scr != NULL) {
    571 			fbinfo = (struct wsdisplay_fbinfo *)data;
    572 			gi = &gp->g_display;
    573 
    574 			/*
    575 			 * We should return truth about the current mode here,
    576 			 * because X11 wsfb driver depends on this!
    577 			 */
    578 			fbinfo->height = gi->gd_fbheight;
    579 			fbinfo->width = gi->gd_fbwidth;
    580 			fbinfo->depth = gi->gd_planes;
    581 			fbinfo->cmsize = gi->gd_colors;
    582 			return 0;
    583 		}
    584 		return ENODEV;
    585 
    586 	case WSDISPLAYIO_GTYPE:
    587 		*(u_int *)data = WSDISPLAY_TYPE_GRF;
    588 		return 0;
    589 
    590 	case WSDISPLAYIO_SMODE:
    591 		if ((*(int *)data) != gp->g_wsmode) {
    592 			gp->g_wsmode = *(int *)data;
    593 			if (gp->g_wsmode == WSDISPLAYIO_MODE_EMUL &&
    594 			    scr != NULL)
    595 				vcons_redraw_screen(scr);
    596 		}
    597 		return 0;
    598 	}
    599 
    600 	return EPASSTHROUGH;
    601 }
    602 
    603 paddr_t
    604 grf_wsmmap(void *v, void *vs, off_t off, int prot)
    605 {
    606 	struct vcons_data *vd;
    607 	struct grf_softc *gp;
    608 	struct grfinfo *gi;
    609 
    610 	vd = v;
    611 	gp = vd->cookie;
    612 	gi = &gp->g_display;
    613 
    614 	/* Normal fb mapping */
    615 	if (off < gi->gd_fbsize)
    616 		return MD_BTOP(((paddr_t)gi->gd_fbaddr) + off);
    617 
    618 	/*
    619 	 * restrict all other mappings to processes with superuser privileges
    620 	 * or the kernel itself
    621 	 */
    622 	if (kauth_authorize_machdep(kauth_cred_get(), KAUTH_MACHDEP_UNMANAGEDMEM,
    623 	    NULL, NULL, NULL, NULL) != 0) {
    624 		aprint_normal("%s: permission to mmap denied.\n",
    625 		    device_xname(gp->g_device));
    626 		return -1;
    627 	}
    628 
    629 	/* Handle register mapping */
    630 	if ((off >= (paddr_t)gi->gd_regaddr) &&
    631 	    (off < ((paddr_t)gi->gd_regaddr + (size_t)gi->gd_regsize)))
    632 		return MD_BTOP(off);
    633 
    634 	if ((off >= (paddr_t)gi->gd_fbaddr) &&
    635 	    (off < ((paddr_t)gi->gd_fbaddr + (size_t)gi->gd_fbsize)))
    636 		return MD_BTOP(off);
    637 
    638 	return -1;
    639 }
    640 
    641 #endif  /* NWSDISPLAY > 0 */
    642 
    643 #endif	/* NGRF > 0 */
    644