Initial source

1 files changed, 98 insertions, 0 deletions

diff --git a/device/dk_label.c b/device/dk_label.c
new file mode 100644
index 00000000..8639e338
--- /dev/null
+++ b/device/dk_label.c
@@ -0,0 +1,98 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1993,1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: rz_disk.c
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	10/90
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <device/device_types.h>
+#include <device/disk_status.h>
+
+/* Checksum a disk label */
+unsigned
+dkcksum(lp)
+	struct disklabel *lp;
+{
+	register unsigned short *start, *end, sum = 0;
+
+	start = (unsigned short *)lp;
+	end = (unsigned short*)&lp->d_partitions[lp->d_npartitions];
+	while (start < end) sum ^= *start++;
+	return sum;
+}
+
+/* Perform some checks and then copy a disk label */
+setdisklabel(lp, nlp)
+	struct disklabel *lp, *nlp;
+{
+	if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
+	    (dkcksum(nlp) != 0))
+		return D_INVALID_OPERATION;
+	*lp = *nlp;
+	return D_SUCCESS;
+}
+
+dkgetlabel(lp, flavor, data, count)
+	struct disklabel *lp;
+	int		flavor;
+	int *		data;		/* pointer to OUT array */
+	unsigned int	*count;		/* OUT */
+{
+
+	switch (flavor) {
+	/* get */
+	case DIOCGDINFO:
+		*(struct disklabel *)data = *lp;
+		*count = sizeof(struct disklabel)/sizeof(int);
+		break;
+	case DIOCGDINFO - (0x10<<16):
+		*(struct disklabel *)data = *lp;
+		*count = sizeof(struct disklabel)/sizeof(int) - 4;
+		break;
+	}
+}
+
+print_bsd_label(lp, str)
+struct disklabel	*lp;
+char			*str;
+{
+int i;
+	printf("%s sectors %d, tracks %d, cylinders %d\n",
+		str, lp->d_nsectors, lp->d_ntracks, lp->d_ncylinders);
+	printf("%s secpercyl %d, secperunit %d, npartitions %d\n",
+		str, lp->d_secpercyl, lp->d_secperunit, lp->d_npartitions);
+
+	for (i = 0; i < lp->d_npartitions; i++) {
+		printf("%s    %c: size = %d, offset = %d\n",
+			str, 'a'+i,
+			lp->d_partitions[i].p_size,
+			lp->d_partitions[i].p_offset);
+	}
+}