2 * sgi partition parsing code
4 * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
6 * This file may be redistributed under the terms of the
7 * GNU Lesser General Public License.
15 #include "partitions.h"
17 #define SGI_MAXPARTITIONS 16
20 #define SGI_TYPE_VOLHDR 0x00
21 #define SGI_TYPE_VOLULME 0x06 /* entire disk */
23 struct sgi_device_parameter {
27 unsigned char sparecyl;
31 uint16_t ntrks; /* tracks in cyl 0 or vol 0 */
33 unsigned char cmd_tag_queue_depth;
34 unsigned char unused0;
37 uint16_t nsect; /* sectors/tracks in cyl 0 or vol 0 */
40 uint32_t flags; /* controller flags */
42 uint32_t retries_on_error;
44 uint16_t xylogics_gap1;
45 uint16_t xylogics_syncdelay;
46 uint16_t xylogics_readdelay;
47 uint16_t xylogics_gap2;
48 uint16_t xylogics_readgate;
49 uint16_t xylogics_writecont;
50 } __attribute__((packed));
52 struct sgi_disklabel {
53 uint32_t magic; /* magic number */
54 uint16_t root_part_num; /* # root partition */
55 uint16_t swap_part_num; /* # swap partition */
56 unsigned char boot_file[16]; /* name of boot file */
58 struct sgi_device_parameter devparam; /* not used now */
61 unsigned char name[8]; /* name of volume */
62 uint32_t block_num; /* logical block number */
63 uint32_t num_bytes; /* how big, in bytes */
64 } __attribute__((packed)) volume[15];
66 struct sgi_partition {
67 uint32_t num_blocks; /* size in logical blocks */
68 uint32_t first_block; /* first logical block */
69 uint32_t type; /* type of this partition */
70 } __attribute__((packed)) partitions[SGI_MAXPARTITIONS];
72 /* checksum is the 32bit 2's complement sum of the disklabel */
73 uint32_t csum; /* disk label checksum */
74 uint32_t padding; /* padding */
75 } __attribute__((packed));
77 static uint32_t count_checksum(struct sgi_disklabel *label)
80 uint32_t *ptr = (uint32_t *) label;
83 i = sizeof(*label) / sizeof(*ptr);
86 sum += be32_to_cpu(ptr[i]);
92 static int probe_sgi_pt(blkid_probe pr,
93 const struct blkid_idmag *mag __attribute__((__unused__)))
95 struct sgi_disklabel *l;
96 struct sgi_partition *p;
97 blkid_parttable tab = NULL;
101 l = (struct sgi_disklabel *) blkid_probe_get_sector(pr, 0);
105 if (count_checksum(l)) {
106 DBG(DEBUG_LOWPROBE, printf(
107 "detected corrupted sgi disk label -- ignore\n"));
111 if (blkid_partitions_need_typeonly(pr))
112 /* caller does not ask for details about partitions */
115 ls = blkid_probe_get_partlist(pr);
119 tab = blkid_partlist_new_parttable(ls, "sgi", 0);
123 for(i = 0, p = &l->partitions[0]; i < SGI_MAXPARTITIONS; i++, p++) {
124 uint32_t size = be32_to_cpu(p->num_blocks);
125 uint32_t start = be32_to_cpu(p->first_block);
126 uint32_t type = be32_to_cpu(p->type);
129 if (size == 0 || type == SGI_TYPE_VOLULME ||
130 type == SGI_TYPE_VOLHDR) {
131 blkid_partlist_increment_partno(ls);
134 par = blkid_partlist_add_partition(ls, tab, start, size);
138 blkid_partition_set_type(par, type);
149 const struct blkid_idinfo sgi_pt_idinfo =
152 .probefunc = probe_sgi_pt,
155 { .magic = "\x0B\xE5\xA9\x41", .len = 4 },