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diff --git a/sys/arch/sparc64/sparc64/disksubr.c b/sys/arch/sparc64/sparc64/disksubr.c
new file mode 100644
index 00000000000..99de3ea5fee
--- /dev/null
+++ b/sys/arch/sparc64/sparc64/disksubr.c
@@ -0,0 +1,467 @@
+/*	$NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk Exp $ */
+
+/*
+ * Copyright (c) 1994, 1995 Gordon W. Ross
+ * Copyright (c) 1994 Theo de Raadt
+ * 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 Theo de Raadt.
+ * 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/param.h>
+#include <sys/systm.h>
+#include <sys/buf.h>
+#include <sys/ioccom.h>
+#include <sys/device.h>
+#include <sys/disklabel.h>
+#include <sys/disk.h>
+#include <sys/dkbad.h>
+
+#include <scsi/scsi_all.h>
+#include <scsi/scsiconf.h>
+
+#include <dev/sun/disklabel.h>
+
+#include <machine/autoconf.h>
+#include <machine/cpu.h>
+#if defined(SUN4)
+#include <machine/oldmon.h>
+#endif
+
+#include <dev/sbus/sbusvar.h>
+
+static	char *disklabel_sun_to_bsd __P((char *, struct disklabel *));
+static	int disklabel_bsd_to_sun __P((struct disklabel *, char *));
+
+extern struct device *bootdv;
+
+/*
+ * Attempt to read a disk label from a device
+ * using the indicated stategy routine.
+ * The label must be partly set up before this:
+ * secpercyl, secsize and anything required for a block i/o read
+ * operation in the driver's strategy/start routines
+ * must be filled in before calling us.
+ *
+ * Return buffer for use in signalling errors if requested.
+ *
+ * Returns null on success and an error string on failure.
+ */
+char *
+readdisklabel(dev, strat, lp, clp, spoofonly)
+	dev_t dev;
+	void (*strat) __P((struct buf *));
+	struct disklabel *lp;
+	struct cpu_disklabel *clp;
+	int spoofonly;
+{
+	struct buf *bp;
+	struct disklabel *dlp;
+	struct sun_disklabel *slp;
+	int error;
+
+	/* minimal requirements for archtypal disk label */
+	if (lp->d_secperunit == 0)
+		lp->d_secperunit = 0x1fffffff;
+	if (lp->d_npartitions == 0) {
+		lp->d_npartitions = RAW_PART + 1;
+		if (lp->d_partitions[RAW_PART].p_size == 0)
+			lp->d_partitions[RAW_PART].p_size = 0x1fffffff;
+		lp->d_partitions[RAW_PART].p_offset = 0;
+	}
+
+	if (spoofonly)
+		return (NULL);
+
+	/* obtain buffer to probe drive with */
+	bp = geteblk((int)lp->d_secsize);
+
+	/* next, dig out disk label */
+	bp->b_dev = dev;
+	bp->b_blkno = LABELSECTOR;
+	bp->b_cylinder = 0;
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags |= B_READ;
+	(*strat)(bp);
+
+	/* if successful, locate disk label within block and validate */
+	error = biowait(bp);
+	if (error == 0) {
+		/* Save the whole block in case it has info we need. */
+		bcopy(bp->b_data, clp->cd_block, sizeof(clp->cd_block));
+	}
+	brelse(bp);
+	if (error)
+		return ("disk label read error");
+
+	/* Check for a NetBSD disk label. */
+	dlp = (struct disklabel *) (clp->cd_block + LABELOFFSET);
+	if (dlp->d_magic == DISKMAGIC) {
+		if (dkcksum(dlp))
+			return ("NetBSD disk label corrupted");
+		*lp = *dlp;
+		return (NULL);
+	}
+
+	/* Check for a Sun disk label (for PROM compatibility). */
+	slp = (struct sun_disklabel *) clp->cd_block;
+	if (slp->sl_magic == SUN_DKMAGIC)
+		return (disklabel_sun_to_bsd(clp->cd_block, lp));
+
+
+	bzero(clp->cd_block, sizeof(clp->cd_block));
+	return ("no disk label");
+}
+
+/*
+ * Check new disk label for sensibility
+ * before setting it.
+ */
+int
+setdisklabel(olp, nlp, openmask, clp)
+	struct disklabel *olp, *nlp;
+	u_long openmask;
+	struct cpu_disklabel *clp;
+{
+	int i;
+	struct partition *opp, *npp;
+
+	/* sanity clause */
+	if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0 ||
+	    (nlp->d_secsize % DEV_BSIZE) != 0)
+		return(EINVAL);
+
+	/* special case to allow disklabel to be invalidated */
+	if (nlp->d_magic == 0xffffffff) {
+		*olp = *nlp;
+		return (0);
+	}
+
+	if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
+	    dkcksum(nlp) != 0)
+		return (EINVAL);
+
+	while ((i = ffs((long)openmask)) != 0) {
+		i--;
+		openmask &= ~(1 << i);
+		if (nlp->d_npartitions <= i)
+			return (EBUSY);
+		opp = &olp->d_partitions[i];
+		npp = &nlp->d_partitions[i];
+		if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
+			return (EBUSY);
+	}
+
+	*olp = *nlp;
+	return (0);
+}
+
+/*
+ * Write disk label back to device after modification.
+ * Current label is already in clp->cd_block[]
+ */
+int
+writedisklabel(dev, strat, lp, clp)
+	dev_t dev;
+	void (*strat) __P((struct buf *));
+	struct disklabel *lp;
+	struct cpu_disklabel *clp;
+{
+	struct buf *bp;
+	int error;
+	struct disklabel *dlp;
+	struct sun_disklabel *slp;
+
+	/*
+	 * Embed native label in a piece of wasteland.
+	 */
+	if (sizeof(struct disklabel) > sizeof slp->sl_bsdlabel)
+		return EFBIG;
+
+	slp = (struct sun_disklabel *)clp->cd_block;
+	bzero(slp->sl_bsdlabel, sizeof(slp->sl_bsdlabel));
+	dlp = (struct disklabel *)slp->sl_bsdlabel;
+	*dlp = *lp;
+
+	/* Build a SunOS compatible label around the native label */
+	error = disklabel_bsd_to_sun(lp, clp->cd_block);
+	if (error)
+		return (error);
+
+	/* Get a buffer and copy the new label into it. */
+	bp = geteblk((int)lp->d_secsize);
+	bcopy(clp->cd_block, bp->b_data, sizeof(clp->cd_block));
+
+	/* Write out the updated label. */
+	bp->b_dev = dev;
+	bp->b_blkno = LABELSECTOR;
+	bp->b_cylinder = 0;
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags |= B_WRITE;
+	(*strat)(bp);
+	error = biowait(bp);
+	brelse(bp);
+
+	return (error);
+}
+
+/*
+ * Determine the size of the transfer, and make sure it is
+ * within the boundaries of the partition. Adjust transfer
+ * if needed, and signal errors or early completion.
+ */
+int
+bounds_check_with_label(bp, lp, osdep, wlabel)
+	struct buf *bp;
+	struct disklabel *lp;
+	struct cpu_disklabel *osdep;
+	int wlabel;
+{
+	struct partition *p = lp->d_partitions + DISKPART(bp->b_dev);
+	int maxsz = p->p_size;
+	int sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
+
+	/*
+	 * overwriting disk label ?
+	 * The label is always in sector LABELSECTOR.
+	 * XXX should also protect bootstrap in first 8K
+	 */
+	if (bp->b_blkno + p->p_offset <= LABELSECTOR &&
+	    (bp->b_flags & B_READ) == 0 && wlabel == 0) {
+		bp->b_error = EROFS;
+		goto bad;
+	}
+
+	/* beyond partition? */
+	if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
+		/* if exactly at end of disk, return an EOF */
+		if (bp->b_blkno == maxsz) {
+			bp->b_resid = bp->b_bcount;
+			return(0);
+		}
+		/* or truncate if part of it fits */
+		sz = maxsz - bp->b_blkno;
+		if (sz <= 0) {
+			bp->b_error = EINVAL;
+			goto bad;
+		}
+		bp->b_bcount = sz << DEV_BSHIFT;
+	}
+
+	/* calculate cylinder for disksort to order transfers with */
+	bp->b_resid = (bp->b_blkno + p->p_offset) / lp->d_secpercyl;
+	return(1);
+bad:
+	bp->b_flags |= B_ERROR;
+	return(-1);
+}
+
+/************************************************************************
+ *
+ * The rest of this was taken from arch/sparc/scsi/sun_disklabel.c
+ * and then substantially rewritten by Gordon W. Ross
+ *
+ ************************************************************************/
+
+/* What partition types to assume for Sun disklabels: */
+static u_char
+sun_fstypes[8] = {
+	FS_BSDFFS,	/* a */
+	FS_SWAP,	/* b */
+	FS_OTHER,	/* c - whole disk */
+	FS_BSDFFS,	/* d */
+	FS_BSDFFS,	/* e */
+	FS_BSDFFS,	/* f */
+	FS_BSDFFS,	/* g */
+	FS_BSDFFS,	/* h */
+};
+
+/*
+ * Given a SunOS disk label, set lp to a BSD disk label.
+ * Returns NULL on success, else an error string.
+ *
+ * The BSD label is cleared out before this is called.
+ */
+static char *
+disklabel_sun_to_bsd(cp, lp)
+	char *cp;
+	struct disklabel *lp;
+{
+	struct sun_disklabel *sl;
+	struct partition *npp;
+	struct sun_dkpart *spp;
+	int i, secpercyl;
+	u_short cksum, *sp1, *sp2;
+
+	sl = (struct sun_disklabel *)cp;
+
+	/* Verify the XOR check. */
+	sp1 = (u_short *)sl;
+	sp2 = (u_short *)(sl + 1);
+	cksum = 0;
+	while (sp1 < sp2)
+		cksum ^= *sp1++;
+	if (cksum != 0)
+		return("SunOS disk label, bad checksum");
+
+	/* Format conversion. */
+	lp->d_magic = DISKMAGIC;
+	lp->d_magic2 = DISKMAGIC;
+	memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname));
+
+	lp->d_secsize = 512;
+	lp->d_nsectors   = sl->sl_nsectors;
+	lp->d_ntracks    = sl->sl_ntracks;
+	lp->d_ncylinders = sl->sl_ncylinders;
+
+	secpercyl = sl->sl_nsectors * sl->sl_ntracks;
+	lp->d_secpercyl  = secpercyl;
+	lp->d_secperunit = secpercyl * sl->sl_ncylinders;
+
+	lp->d_sparespercyl = sl->sl_sparespercyl;
+	lp->d_acylinders   = sl->sl_acylinders;
+	lp->d_rpm          = sl->sl_rpm;
+	lp->d_interleave   = sl->sl_interleave;
+
+	lp->d_npartitions = 8;
+	/* These are as defined in <ufs/ffs/fs.h> */
+	lp->d_bbsize = 8192;	/* XXX */
+	lp->d_sbsize = 8192;	/* XXX */
+
+	for (i = 0; i < 8; i++) {
+		spp = &sl->sl_part[i];
+		npp = &lp->d_partitions[i];
+		npp->p_offset = spp->sdkp_cyloffset * secpercyl;
+		npp->p_size = spp->sdkp_nsectors;
+		if (npp->p_size == 0) {
+			npp->p_fstype = FS_UNUSED;
+		} else {
+			npp->p_fstype = sun_fstypes[i];
+			if (npp->p_fstype == FS_BSDFFS) {
+				/*
+				 * The sun label does not store the FFS fields,
+				 * so just set them with default values here.
+				 */
+				npp->p_fsize = 1024;
+				npp->p_frag = 8;
+				npp->p_cpg = 16;
+			}
+		}
+	}
+
+	lp->d_checksum = 0;
+	lp->d_checksum = dkcksum(lp);
+	return (NULL);
+}
+
+/*
+ * Given a BSD disk label, update the Sun disklabel
+ * pointed to by cp with the new info.  Note that the
+ * Sun disklabel may have other info we need to keep.
+ * Returns zero or error code.
+ */
+static int
+disklabel_bsd_to_sun(lp, cp)
+	struct disklabel *lp;
+	char *cp;
+{
+	struct sun_disklabel *sl;
+	struct partition *npp;
+	struct sun_dkpart *spp;
+	int i, secpercyl;
+	u_short cksum, *sp1, *sp2;
+
+	if (lp->d_secsize != 512)
+		return (EINVAL);
+
+	sl = (struct sun_disklabel *)cp;
+
+	/*
+	 * Format conversion.
+	 */
+	memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname));
+	sl->sl_rpm = lp->d_rpm;
+	sl->sl_pcylinders   = lp->d_ncylinders + lp->d_acylinders; /* XXX */
+	sl->sl_sparespercyl = lp->d_sparespercyl;
+	sl->sl_interleave   = lp->d_interleave;
+	sl->sl_ncylinders   = lp->d_ncylinders;
+	sl->sl_acylinders   = lp->d_acylinders;
+	sl->sl_ntracks      = lp->d_ntracks;
+	sl->sl_nsectors     = lp->d_nsectors;
+
+	secpercyl = sl->sl_nsectors * sl->sl_ntracks;
+	for (i = 0; i < 8; i++) {
+		spp = &sl->sl_part[i];
+		npp = &lp->d_partitions[i];
+
+		/*
+		 * SunOS partitions must start on a cylinder boundary.
+		 * Note this restriction is forced upon NetBSD/sparc
+		 * labels too, since we want to keep both labels
+		 * synchronised.
+		 */
+		if (npp->p_offset % secpercyl)
+			return (EINVAL);
+		spp->sdkp_cyloffset = npp->p_offset / secpercyl;
+		spp->sdkp_nsectors = npp->p_size;
+	}
+	sl->sl_magic = SUN_DKMAGIC;
+
+	/* Compute the XOR check. */
+	sp1 = (u_short *)sl;
+	sp2 = (u_short *)(sl + 1);
+	sl->sl_cksum = cksum = 0;
+	while (sp1 < sp2)
+		cksum ^= *sp1++;
+	sl->sl_cksum = cksum;
+
+	return (0);
+}
+
+/*
+ * Search the bad sector table looking for the specified sector.
+ * Return index if found.
+ * Return -1 if not found.
+ */
+int
+isbad(bt, cyl, trk, sec)
+	struct dkbad *bt;
+	int cyl, trk, sec;
+{
+	int i;
+	long blk, bblk;
+
+	blk = ((long)cyl << 16) + (trk << 8) + sec;
+	for (i = 0; i < 126; i++) {
+		bblk = ((long)bt->bt_bad[i].bt_cyl << 16) +
+			bt->bt_bad[i].bt_trksec;
+		if (blk == bblk)
+			return (i);
+		if (blk < bblk || bblk < 0)
+			break;
+	}
+	return (-1);
+}