1/*
2 *  fs/partitions/atari.c
3 *
4 *  Code extracted from drivers/block/genhd.c
5 *
6 *  Copyright (C) 1991-1998  Linus Torvalds
7 *  Re-organised Feb 1998 Russell King
8 */
9
10#include <linux/ctype.h>
11#include "check.h"
12#include "atari.h"
13
14/* ++guenther: this should be settable by the user ("make config")?.
15 */
16#define ICD_PARTS
17
18/* check if a partition entry looks valid -- Atari format is assumed if at
19   least one of the primary entries is ok this way */
20#define	VALID_PARTITION(pi,hdsiz)					     \
21    (((pi)->flg & 1) &&							     \
22     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
23     be32_to_cpu((pi)->st) <= (hdsiz) &&				     \
24     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
25
26static inline int OK_id(char *s)
27{
28	return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
29		memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
30		memcmp (s, "RAW", 3) == 0 ;
31}
32
33int atari_partition(struct parsed_partitions *state)
34{
35	Sector sect;
36	struct rootsector *rs;
37	struct partition_info *pi;
38	u32 extensect;
39	u32 hd_size;
40	int slot;
41#ifdef ICD_PARTS
42	int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
43#endif
44
45	rs = read_part_sector(state, 0, &sect);
46	if (!rs)
47		return -1;
48
49	/* Verify this is an Atari rootsector: */
50	hd_size = state->bdev->bd_inode->i_size >> 9;
51	if (!VALID_PARTITION(&rs->part[0], hd_size) &&
52	    !VALID_PARTITION(&rs->part[1], hd_size) &&
53	    !VALID_PARTITION(&rs->part[2], hd_size) &&
54	    !VALID_PARTITION(&rs->part[3], hd_size)) {
55		/*
56		 * if there's no valid primary partition, assume that no Atari
57		 * format partition table (there's no reliable magic or the like
58	         * :-()
59		 */
60		put_dev_sector(sect);
61		return 0;
62	}
63
64	pi = &rs->part[0];
65	strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
66	for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
67		struct rootsector *xrs;
68		Sector sect2;
69		ulong partsect;
70
71		if ( !(pi->flg & 1) )
72			continue;
73		/* active partition */
74		if (memcmp (pi->id, "XGM", 3) != 0) {
75			/* we don't care about other id's */
76			put_partition (state, slot, be32_to_cpu(pi->st),
77					be32_to_cpu(pi->siz));
78			continue;
79		}
80		/* extension partition */
81#ifdef ICD_PARTS
82		part_fmt = 1;
83#endif
84		strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
85		partsect = extensect = be32_to_cpu(pi->st);
86		while (1) {
87			xrs = read_part_sector(state, partsect, &sect2);
88			if (!xrs) {
89				printk (" block %ld read failed\n", partsect);
90				put_dev_sector(sect);
91				return -1;
92			}
93
94			/* ++roman: sanity check: bit 0 of flg field must be set */
95			if (!(xrs->part[0].flg & 1)) {
96				printk( "\nFirst sub-partition in extended partition is not valid!\n" );
97				put_dev_sector(sect2);
98				break;
99			}
100
101			put_partition(state, slot,
102				   partsect + be32_to_cpu(xrs->part[0].st),
103				   be32_to_cpu(xrs->part[0].siz));
104
105			if (!(xrs->part[1].flg & 1)) {
106				/* end of linked partition list */
107				put_dev_sector(sect2);
108				break;
109			}
110			if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
111				printk("\nID of extended partition is not XGM!\n");
112				put_dev_sector(sect2);
113				break;
114			}
115
116			partsect = be32_to_cpu(xrs->part[1].st) + extensect;
117			put_dev_sector(sect2);
118			if (++slot == state->limit) {
119				printk( "\nMaximum number of partitions reached!\n" );
120				break;
121			}
122		}
123		strlcat(state->pp_buf, " >", PAGE_SIZE);
124	}
125#ifdef ICD_PARTS
126	if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
127		pi = &rs->icdpart[0];
128		/* sanity check: no ICD format if first partition invalid */
129		if (OK_id(pi->id)) {
130			strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
131			for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
132				/* accept only GEM,BGM,RAW,LNX,SWP partitions */
133				if (!((pi->flg & 1) && OK_id(pi->id)))
134					continue;
135				part_fmt = 2;
136				put_partition (state, slot,
137						be32_to_cpu(pi->st),
138						be32_to_cpu(pi->siz));
139			}
140			strlcat(state->pp_buf, " >", PAGE_SIZE);
141		}
142	}
143#endif
144	put_dev_sector(sect);
145
146	strlcat(state->pp_buf, "\n", PAGE_SIZE);
147
148	return 1;
149}
150