1 files changed, 159 insertions, 0 deletions
diff --git a/libblkid/sgi.c b/libblkid/sgi.c
new file mode 100644
index 000000000..b89e46320
--- /dev/null
+++ b/libblkid/sgi.c
@@ -0,0 +1,159 @@
+/*
+ * sgi partition parsing code
+ *
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "partitions.h"
+
+#define SGI_MAXPARTITIONS	16
+
+/* partition type */
+#define SGI_TYPE_VOLHDR		0x00
+#define SGI_TYPE_VOLULME	0x06	/* entire disk */
+
+struct sgi_device_parameter {
+	unsigned char skew;
+	unsigned char gap1;
+	unsigned char gap2;
+	unsigned char sparecyl;
+
+	uint16_t pcylcount;
+	uint16_t head_vol0;
+	uint16_t ntrks;		/* tracks in cyl 0 or vol 0 */
+
+	unsigned char cmd_tag_queue_depth;
+	unsigned char unused0;
+
+	uint16_t unused1;
+	uint16_t nsect;		/* sectors/tracks in cyl 0 or vol 0 */
+	uint16_t bytes;
+	uint16_t ilfact;
+	uint32_t flags;		/* controller flags */
+	uint32_t datarate;
+	uint32_t retries_on_error;
+	uint32_t ms_per_word;
+	uint16_t xylogics_gap1;
+	uint16_t xylogics_syncdelay;
+	uint16_t xylogics_readdelay;
+	uint16_t xylogics_gap2;
+	uint16_t xylogics_readgate;
+	uint16_t xylogics_writecont;
+} __attribute__((packed));
+
+struct sgi_disklabel {
+	uint32_t magic;			/* magic number */
+	uint16_t root_part_num;		/* # root partition */
+	uint16_t swap_part_num;		/* # swap partition */
+	unsigned char boot_file[16];	/* name of boot file */
+
+	struct sgi_device_parameter	devparam;	/* not used now */
+
+	struct sgi_volume {
+		unsigned char name[8];	/* name of volume */
+		uint32_t block_num;	/* logical block number */
+		uint32_t num_bytes;	/* how big, in bytes */
+	} __attribute__((packed)) volume[15];
+
+	struct sgi_partition {
+		uint32_t num_blocks;	/* size in logical blocks */
+		uint32_t first_block;	/* first logical block */
+		uint32_t type;		/* type of this partition */
+	} __attribute__((packed)) partitions[SGI_MAXPARTITIONS];
+
+	/* checksum is the 32bit 2's complement sum of the disklabel */
+	uint32_t csum;			/* disk label checksum */
+	uint32_t padding;		/* padding */
+} __attribute__((packed));
+
+static uint32_t count_checksum(struct sgi_disklabel *label)
+{
+	int i;
+	uint32_t *ptr = (uint32_t *) label;
+	uint32_t sum = 0;
+
+	i = sizeof(*label) / sizeof(*ptr);
+
+	while (i--)
+		sum += be32_to_cpu(ptr[i]);
+
+	return sum;
+}
+
+
+static int probe_sgi_pt(blkid_probe pr,
+		const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+	struct sgi_disklabel *l;
+	struct sgi_partition *p;
+	blkid_parttable tab = NULL;
+	blkid_partlist ls;
+	int i;
+
+	l = (struct sgi_disklabel *) blkid_probe_get_sector(pr, 0);
+	if (!l)
+		goto nothing;
+
+	if (count_checksum(l)) {
+		DBG(DEBUG_LOWPROBE, printf(
+			"detected corrupted sgi disk label -- ignore\n"));
+		goto nothing;
+	}
+
+	if (blkid_partitions_need_typeonly(pr))
+		/* caller does not ask for details about partitions */
+		return 0;
+
+	ls = blkid_probe_get_partlist(pr);
+	if (!ls)
+		goto err;
+
+	tab = blkid_partlist_new_parttable(ls, "sgi", 0);
+	if (!tab)
+		goto err;
+
+	for(i = 0, p = &l->partitions[0]; i < SGI_MAXPARTITIONS; i++, p++) {
+		uint32_t size = be32_to_cpu(p->num_blocks);
+		uint32_t start = be32_to_cpu(p->first_block);
+		uint32_t type = be32_to_cpu(p->type);
+		blkid_partition par;
+
+		if (size == 0 || type == SGI_TYPE_VOLULME ||
+			         type == SGI_TYPE_VOLHDR) {
+			blkid_partlist_increment_partno(ls);
+			continue;
+		}
+		par = blkid_partlist_add_partition(ls, tab, start, size);
+		if (!par)
+			goto err;
+
+		blkid_partition_set_type(par, type);
+	}
+
+	return 0;
+
+nothing:
+	return 1;
+err:
+	return -1;
+}
+
+const struct blkid_idinfo sgi_pt_idinfo =
+{
+	.name		= "sgi",
+	.probefunc	= probe_sgi_pt,
+	.magics		=
+	{
+		{ .magic = "\x0B\xE5\xA9\x41", .len = 4	},
+		{ NULL }
+	}
+};
+