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/*
media-filesystem library, partition routines
tridge@samba.org, January 2001
released under the Gnu GPL v2
*/
#include "mfs.h"
#define MAX_PARTITIONS 20
#define PARTITION_MAGIC 0x504d
struct tivo_partition {
u16 signature; /* expected to be PARTITION_MAGIC */
u16 res1;
u32 map_count; /* # blocks in partition map */
u32 start_block; /* absolute starting block # of partition */
u32 block_count; /* number of blocks in partition */
char name[32]; /* partition name */
char type[32]; /* string type description */
u32 data_start; /* rel block # of first data block */
u32 data_count; /* number of data blocks */
u32 status; /* partition status bits */
u32 boot_start;
u32 boot_size;
u32 boot_load;
u32 boot_load2;
u32 boot_entry;
u32 boot_entry2;
u32 boot_cksum;
char processor[16]; /* identifies ISA of boot */
/* there is more stuff after this that we don't need */
};
struct pmap {
u32 start;
u32 length;
} pmaps[MAX_PARTITIONS];
static int num_partitions = 0;
static int use_ptable = 0;
/* parse the tivo partition table */
int vstream_partition_parse(void)
{
char buf[SECTOR_SIZE];
struct tivo_partition *tp;
int i, count;
tp = (struct tivo_partition *)buf;
vserver_vstream_read_sectors(tp, 1, 1);
count = ntohl(tp->map_count);
for (i=0;i<count;i++) {
vserver_vstream_read_sectors(tp, i+1, 1);
if (ntohs(tp->signature) != PARTITION_MAGIC) {
vstream_error("wrong magic %x in partition %d\n",
ntohs(tp->signature), i);
return 1;
}
if (strcmp(tp->type, "MFS") == 0) {
pmaps[num_partitions].start = ntohl(tp->start_block);
pmaps[num_partitions].length = ntohl(tp->block_count);
num_partitions++;
}
}
use_ptable = 1;
return 0;
}
u32 vstream_partition_total_size(void)
{
u32 total=0;
int i;
if (!use_ptable) return 0;
for (i=0; i<num_partitions; i++) {
total += (pmaps[i].length & ~(MFS_BLOCK_ROUND-1));
}
return total;
}
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