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/*
* fs/partitions/sun.c
*
* Code extracted from drivers/block/genhd.c
*
* Copyright (C) 1991-1998 Linus Torvalds
* Re-organised Feb 1998 Russell King
*/
#include "check.h"
#include "sun.h"
int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
{
int i;
__be16 csum;
int slot = 1;
__be16 *ush;
Sector sect;
struct sun_disklabel {
unsigned char info[128]; /* Informative text string */
unsigned char spare0[14];
struct sun_info {
unsigned char spare1;
unsigned char id;
unsigned char spare2;
unsigned char flags;
} infos[8];
unsigned char spare[246]; /* Boot information etc. */
__be16 rspeed; /* Disk rotational speed */
__be16 pcylcount; /* Physical cylinder count */
__be16 sparecyl; /* extra sects per cylinder */
unsigned char spare2[4]; /* More magic... */
__be16 ilfact; /* Interleave factor */
__be16 ncyl; /* Data cylinder count */
__be16 nacyl; /* Alt. cylinder count */
__be16 ntrks; /* Tracks per cylinder */
__be16 nsect; /* Sectors per track */
unsigned char spare3[4]; /* Even more magic... */
struct sun_partition {
__be32 start_cylinder;
__be32 num_sectors;
} partitions[8];
__be16 magic; /* Magic number */
__be16 csum; /* Label xor'd checksum */
} * label;
struct sun_partition *p;
unsigned long spc;
char b[BDEVNAME_SIZE];
label = (struct sun_disklabel *)read_dev_sector(bdev, 0, §);
if (!label)
return -1;
p = label->partitions;
if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
bdevname(bdev, b), be16_to_cpu(label->magic)); */
put_dev_sector(sect);
return 0;
}
/* Look at the checksum */
ush = ((__be16 *) (label+1)) - 1;
for (csum = 0; ush >= ((__be16 *) label);)
csum ^= *ush--;
if (csum) {
printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
bdevname(bdev, b));
put_dev_sector(sect);
return 0;
}
/* All Sun disks have 8 partition entries */
spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
for (i = 0; i < 8; i++, p++) {
unsigned long st_sector;
unsigned int num_sectors;
st_sector = be32_to_cpu(p->start_cylinder) * spc;
num_sectors = be32_to_cpu(p->num_sectors);
if (num_sectors) {
put_partition(state, slot, st_sector, num_sectors);
if (label->infos[i].id == LINUX_RAID_PARTITION)
state->parts[slot].flags = 1;
}
slot++;
}
printk("\n");
put_dev_sector(sect);
return 1;
}
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