patch-1.3.94 linux/arch/m68k/amiga/amipart.c

• Lines: 120
• Date: Wed Mar 20 20:03:41 1996
• Orig file: v1.3.93/linux/arch/m68k/amiga/amipart.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/amiga/amipart.c linux/arch/m68k/amiga/amipart.c
@@ -0,0 +1,119 @@
+/*
+ * linux/amiga/amipart.c
+ *
+ * Amiga partition checking driver for 680x0 Linux
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file README.legal in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/kernel.h>
+
+#include <asm/amigardb.h>
+#include <asm/machdep.h>
+
+extern int current_minor;
+
+static ulong checksum (ulong *ptr, int len)
+{
+	ulong sum;
+	int cnt;
+
+	for (sum = 0, cnt = 0; cnt < len; cnt++)
+		sum += ptr[cnt];
+
+	return sum;
+}
+
+/* XXX */
+/* int current_minor = 0; */
+
+void amiga_check_partition(struct gendisk *hd, kdev_t dev)
+{
+	int i, minor = current_minor, m_lim = current_minor + hd->max_p;
+	struct buffer_head *bh;
+	struct RigidDiskBlock *rdb;
+	struct PartitionBlock *pb;
+	ulong bnum, partsect;
+
+	for (bnum = 0; bnum < RDB_LOCATION_LIMIT/2; bnum++) {
+		if (!(bh = bread(dev,bnum,1024))) {
+			printk (" unable to read block %ld\n", bnum);
+			return;
+		}
+#ifdef DEBUG
+		printk ("block read, press mousebutton to continue\n");
+		waitbut();
+#endif
+		rdb = (struct RigidDiskBlock *)bh->b_data;
+		if (rdb->rdb_ID == IDNAME_RIGIDDISK)
+			break;
+		rdb = (struct RigidDiskBlock *)&bh->b_data[512];
+		if (rdb->rdb_ID == IDNAME_RIGIDDISK)
+			break;
+		brelse (bh);
+	}
+	if (bnum == RDB_LOCATION_LIMIT/2) {
+		/* no RDB on the disk! */
+		printk (" unable to find RigidDiskBlock\n");
+		return;
+	}
+
+	/* checksum the RigidDiskBlock */
+	if (checksum ((ulong *)rdb, rdb->rdb_SummedLongs) != 0) {
+		printk (" RDB checksum bad\n");
+		return;
+	}
+
+	printk("  %s%c:", hd->major_name, 'a'+(minor >> hd->minor_shift));
+
+	partsect = rdb->rdb_PartitionList;
+	brelse (bh);
+
+	for (i = 1; minor < m_lim && partsect != 0xffffffff; minor++, i++)
+	{
+		ulong *env;
+
+		if (!(bh = bread(dev,partsect/2,1024))) {
+			printk (" block %ld read failed\n", partsect);
+			return;
+		}
+#ifdef DEBUG
+		printk ("block read, press mousebutton to continue\n");
+		waitbut();
+#endif
+		pb = (struct PartitionBlock *)bh->b_data;
+		if (partsect & 1)
+			pb = (struct PartitionBlock *)&bh->b_data[512];
+		if (pb->pb_ID != IDNAME_PARTITION) {
+			printk (" block %ld Not a partition block (%#lx)\n",
+				partsect, pb->pb_ID);
+			brelse (bh);
+			return;
+		}
+		if (checksum ((ulong *)pb, pb->pb_SummedLongs) != 0) {
+			printk (" block %ld checksum bad\n", partsect);
+			brelse (bh);
+			return;
+		}
+
+		env = pb->pb_Environment;
+
+		hd->part[minor].start_sect = env[DE_LOWCYL]
+			* env[DE_NUMHEADS] * env[DE_BLKSPERTRACK];
+		hd->part[minor].nr_sects = (env[DE_UPPERCYL]
+					    - env[DE_LOWCYL] + 1)
+			* env[DE_NUMHEADS] * env[DE_BLKSPERTRACK];
+
+		printk(" %s%c%d", hd->major_name,
+		       'a'+(minor >> hd->minor_shift), i);
+
+		partsect = pb->pb_Next;
+		brelse (bh);
+	}
+
+	printk ("\n");
+}