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/*
* 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 }
}
};
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