By popular demand and peer pressure, check-in work in progress work to support

the Yeelong Lemote mips-based netbook. Kernel bits only for now, needs
polishing; most of this work done during h2k9 last month, although the
porting effort started earlier this year.

1 files changed, 132 insertions, 0 deletions

diff --git a/sys/arch/loongson/loongson/disksubr.c b/sys/arch/loongson/loongson/disksubr.c
new file mode 100644
index 00000000000..2055a98fdac
--- /dev/null
+++ b/sys/arch/loongson/loongson/disksubr.c
@@ -0,0 +1,132 @@
+/*	$OpenBSD: disksubr.c,v 1.1 2009/08/17 06:34:30 miod Exp $	*/
+/*	$NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $	*/
+
+/*
+ * Copyright (c) 1996 Theo de Raadt
+ * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
+ * 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. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/buf.h>
+#include <sys/disklabel.h>
+#include <sys/disk.h>
+
+/*
+ * Attempt to read a disk label from a device
+ * using the indicated strategy 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.
+ *
+ * If dos partition table requested, attempt to load it and
+ * find disklabel inside a DOS partition. Return buffer
+ * for use in signalling errors if requested.
+ *
+ * We would like to check if each MBR has a valid DOSMBR_SIGNATURE, but
+ * we cannot because it doesn't always exist. So.. we assume the
+ * MBR is valid.
+ *
+ * Returns null on success and an error string on failure.
+ */
+int
+readdisklabel(dev_t dev, void (*strat)(struct buf *),
+    struct disklabel *lp, int spoofonly)
+{
+	struct buf *bp = NULL;
+	int error;
+
+	if ((error = initdisklabel(lp)))
+		goto done;
+
+	/* get a buffer and initialize it */
+	bp = geteblk((int)lp->d_secsize);
+	bp->b_dev = dev;
+
+	error = readdoslabel(bp, strat, lp, NULL, spoofonly);
+	if (error == 0)
+		goto done;
+
+#if defined(CD9660)
+	error = iso_disklabelspoof(dev, strat, lp);
+	if (error == 0)
+		goto done;
+#endif
+#if defined(UDF)
+	error = udf_disklabelspoof(dev, strat, lp);
+	if (error == 0)
+		goto done;
+#endif
+
+done:
+	if (bp) {
+		bp->b_flags |= B_INVAL;
+		brelse(bp);
+	}
+	return (error);
+}
+
+/*
+ * Write disk label back to device after modification.
+ */
+int
+writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
+{
+	int error = EIO, partoff = -1;
+	struct disklabel *dlp;
+	struct buf *bp = NULL;
+
+	/* get a buffer and initialize it */
+	bp = geteblk((int)lp->d_secsize);
+	bp->b_dev = dev;
+
+	if (readdoslabel(bp, strat, lp, &partoff, 1) != NULL)
+		goto done;
+
+	/* Read it in, slap the new label in, and write it back out */
+	bp->b_blkno = partoff + LABELSECTOR;
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags = B_BUSY | B_READ | B_RAW;
+	(*strat)(bp);
+	if ((error = biowait(bp)) != 0)
+		goto done;
+
+	dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
+	*dlp = *lp;
+	bp->b_flags = B_BUSY | B_WRITE | B_RAW;
+	(*strat)(bp);
+	error = biowait(bp);
+
+done:
+	if (bp) {
+		bp->b_flags |= B_INVAL;
+		brelse(bp);
+	}
+	return (error);
+}