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/*
* fs/partitions/atari.c
*
* Code extracted from drivers/block/genhd.c
*
* Copyright (C) 1991-1998 Linus Torvalds
* Re-organised Feb 1998 Russell King
*/
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/blk.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/system.h>
#include "check.h"
#include "atari.h"
/* ++guenther: this should be settable by the user ("make config")?.
*/
#define ICD_PARTS
/* check if a partition entry looks valid -- Atari format is assumed if at
least one of the primary entries is ok this way */
#define VALID_PARTITION(pi,hdsiz) \
(((pi)->flg & 1) && \
isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
be32_to_cpu((pi)->st) <= (hdsiz) && \
be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
int atari_partition (struct gendisk *hd, kdev_t dev,
unsigned long first_sector, int minor)
{
int m_lim = minor + hd->max_p;
struct buffer_head *bh;
struct rootsector *rs;
struct partition_info *pi;
u32 extensect;
u32 hd_size;
#ifdef ICD_PARTS
int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
#endif
bh = bread (dev, 0, get_ptable_blocksize(dev));
if (!bh) {
if (warn_no_part) printk (" unable to read block 0 (partition table)\n");
return -1;
}
/* Verify this is an Atari rootsector: */
rs = (struct rootsector *) bh->b_data;
hd_size = hd->part[minor - 1].nr_sects;
if (!VALID_PARTITION(&rs->part[0], hd_size) &&
!VALID_PARTITION(&rs->part[1], hd_size) &&
!VALID_PARTITION(&rs->part[2], hd_size) &&
!VALID_PARTITION(&rs->part[3], hd_size)) {
/* if there's no valid primary partition, assume that no Atari
format partition table (there's no reliable magic or the like
:-() */
brelse(bh);
return 0;
}
pi = &rs->part[0];
printk (" AHDI");
for (; pi < &rs->part[4] && minor < m_lim; minor++, pi++)
{
if (pi->flg & 1)
/* active partition */
{
if (memcmp (pi->id, "XGM", 3) == 0)
/* extension partition */
{
struct rootsector *xrs;
struct buffer_head *xbh;
ulong partsect;
#ifdef ICD_PARTS
part_fmt = 1;
#endif
printk(" XGM<");
partsect = extensect = be32_to_cpu(pi->st);
while (1)
{
xbh = bread (dev, partsect / 2, get_ptable_blocksize(dev));
if (!xbh)
{
printk (" block %ld read failed\n", partsect);
brelse(bh);
return 0;
}
if (partsect & 1)
xrs = (struct rootsector *) &xbh->b_data[512];
else
xrs = (struct rootsector *) &xbh->b_data[0];
/* ++roman: sanity check: bit 0 of flg field must be set */
if (!(xrs->part[0].flg & 1)) {
printk( "\nFirst sub-partition in extended partition is not valid!\n" );
break;
}
add_gd_partition(hd, minor,
partsect + be32_to_cpu(xrs->part[0].st),
be32_to_cpu(xrs->part[0].siz));
if (!(xrs->part[1].flg & 1)) {
/* end of linked partition list */
brelse( xbh );
break;
}
if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
printk( "\nID of extended partition is not XGM!\n" );
brelse( xbh );
break;
}
partsect = be32_to_cpu(xrs->part[1].st) + extensect;
brelse (xbh);
minor++;
if (minor >= m_lim) {
printk( "\nMaximum number of partitions reached!\n" );
break;
}
}
printk(" >");
}
else
{
/* we don't care about other id's */
add_gd_partition (hd, minor, be32_to_cpu(pi->st),
be32_to_cpu(pi->siz));
}
}
}
#ifdef ICD_PARTS
if ( part_fmt!=1 ) /* no extended partitions -> test ICD-format */
{
pi = &rs->icdpart[0];
/* sanity check: no ICD format if first partition invalid */
if (memcmp (pi->id, "GEM", 3) == 0 ||
memcmp (pi->id, "BGM", 3) == 0 ||
memcmp (pi->id, "LNX", 3) == 0 ||
memcmp (pi->id, "SWP", 3) == 0 ||
memcmp (pi->id, "RAW", 3) == 0 )
{
printk(" ICD<");
for (; pi < &rs->icdpart[8] && minor < m_lim; minor++, pi++)
{
/* accept only GEM,BGM,RAW,LNX,SWP partitions */
if (pi->flg & 1 &&
(memcmp (pi->id, "GEM", 3) == 0 ||
memcmp (pi->id, "BGM", 3) == 0 ||
memcmp (pi->id, "LNX", 3) == 0 ||
memcmp (pi->id, "SWP", 3) == 0 ||
memcmp (pi->id, "RAW", 3) == 0) )
{
part_fmt = 2;
add_gd_partition (hd, minor, be32_to_cpu(pi->st),
be32_to_cpu(pi->siz));
}
}
printk(" >");
}
}
#endif
brelse (bh);
printk ("\n");
return 1;
}
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