4 * Code extracted from drivers/block/genhd.c
10 struct sgi_disklabel {
11 s32 magic_mushroom; /* Big fat spliff... */
12 s16 root_part_num; /* Root partition number */
13 s16 swap_part_num; /* Swap partition number */
14 s8 boot_file[16]; /* Name of boot file for ARCS */
15 u8 _unused0[48]; /* Device parameter useless crapola.. */
17 s8 name[8]; /* Name of volume */
18 s32 block_num; /* Logical block number */
19 s32 num_bytes; /* How big, in bytes */
21 struct sgi_partition {
22 u32 num_blocks; /* Size in logical blocks */
23 u32 first_block; /* First logical block */
24 s32 type; /* Type of this partition */
26 s32 csum; /* Disk label checksum */
27 s32 _unused1; /* Padding */
30 int sgi_partition(struct parsed_partitions *state, struct block_device *bdev)
34 unsigned int *ui, start, blocks, cs;
36 struct sgi_disklabel *label;
37 struct sgi_partition *p;
38 char b[BDEVNAME_SIZE];
40 label = (struct sgi_disklabel *) read_dev_sector(bdev, 0, §);
43 p = &label->partitions[0];
44 magic = label->magic_mushroom;
45 if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
46 /*printk("Dev %s SGI disklabel: bad magic %08x\n",
47 bdevname(bdev, b), magic);*/
51 ui = ((unsigned int *) (label + 1)) - 1;
52 for(csum = 0; ui >= ((unsigned int *) label);) {
54 csum += be32_to_cpu(cs);
57 printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
62 /* All SGI disk labels have 16 partitions, disks under Linux only
63 * have 15 minor's. Luckily there are always a few zero length
64 * partitions which we don't care about so we never overflow the
67 for(i = 0; i < 16; i++, p++) {
68 blocks = be32_to_cpu(p->num_blocks);
69 start = be32_to_cpu(p->first_block);
71 put_partition(state, slot++, start, blocks);