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// SPDX-License-Identifier: GPL-2.0
/*
* 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/ctype.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))
static inline int OK_id(char *s)
{
return memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
memcmp (s, "RAW", 3) == 0 ;
}
int atari_partition(struct parsed_partitions *state)
{
Sector sect;
struct rootsector *rs;
struct partition_info *pi;
u32 extensect;
u32 hd_size;
int slot;
#ifdef ICD_PARTS
int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
#endif
/*
* ATARI partition scheme supports 512 lba only. If this is not
* the case, bail early to avoid miscalculating hd_size.
*/
if (queue_logical_block_size(state->disk->queue) != 512)
return 0;
rs = read_part_sector(state, 0, §);
if (!rs)
return -1;
/* Verify this is an Atari rootsector: */
hd_size = get_capacity(state->disk);
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
* :-()
*/
put_dev_sector(sect);
return 0;
}
pi = &rs->part[0];
strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
struct rootsector *xrs;
Sector sect2;
ulong partsect;
if ( !(pi->flg & 1) )
continue;
/* active partition */
if (memcmp (pi->id, "XGM", 3) != 0) {
/* we don't care about other id's */
put_partition (state, slot, be32_to_cpu(pi->st),
be32_to_cpu(pi->siz));
continue;
}
/* extension partition */
#ifdef ICD_PARTS
part_fmt = 1;
#endif
strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
partsect = extensect = be32_to_cpu(pi->st);
while (1) {
xrs = read_part_sector(state, partsect, §2);
if (!xrs) {
printk (" block %ld read failed\n", partsect);
put_dev_sector(sect);
return -1;
}
/* ++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" );
put_dev_sector(sect2);
break;
}
put_partition(state, slot,
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 */
put_dev_sector(sect2);
break;
}
if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
printk("\nID of extended partition is not XGM!\n");
put_dev_sector(sect2);
break;
}
partsect = be32_to_cpu(xrs->part[1].st) + extensect;
put_dev_sector(sect2);
if (++slot == state->limit) {
printk( "\nMaximum number of partitions reached!\n" );
break;
}
}
strlcat(state->pp_buf, " >", PAGE_SIZE);
}
#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 (OK_id(pi->id)) {
strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
/* accept only GEM,BGM,RAW,LNX,SWP partitions */
if (!((pi->flg & 1) && OK_id(pi->id)))
continue;
part_fmt = 2;
put_partition (state, slot,
be32_to_cpu(pi->st),
be32_to_cpu(pi->siz));
}
strlcat(state->pp_buf, " >", PAGE_SIZE);
}
}
#endif
put_dev_sector(sect);
strlcat(state->pp_buf, "\n", PAGE_SIZE);
return 1;
}
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