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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/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
- rs = read_part_sector(state, 0, §);
- if (!rs)
- return -1;
- /* Verify this is an Atari rootsector: */
- hd_size = state->bdev->bd_inode->i_size >> 9;
- 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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