Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[platform/kernel/linux-starfive.git] / block / partitions / sun.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  fs/partitions/sun.c
4  *
5  *  Code extracted from drivers/block/genhd.c
6  *
7  *  Copyright (C) 1991-1998  Linus Torvalds
8  *  Re-organised Feb 1998 Russell King
9  */
10
11 #include "check.h"
12
13 #define SUN_LABEL_MAGIC          0xDABE
14 #define SUN_VTOC_SANITY          0x600DDEEE
15
16 enum {
17         SUN_WHOLE_DISK = 5,
18         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
19 };
20
21 int sun_partition(struct parsed_partitions *state)
22 {
23         int i;
24         __be16 csum;
25         int slot = 1;
26         __be16 *ush;
27         Sector sect;
28         struct sun_disklabel {
29                 unsigned char info[128];   /* Informative text string */
30                 struct sun_vtoc {
31                     __be32 version;     /* Layout version */
32                     char   volume[8];   /* Volume name */
33                     __be16 nparts;      /* Number of partitions */
34                     struct sun_info {           /* Partition hdrs, sec 2 */
35                         __be16 id;
36                         __be16 flags;
37                     } infos[8];
38                     __be16 padding;     /* Alignment padding */
39                     __be32 bootinfo[3];  /* Info needed by mboot */
40                     __be32 sanity;       /* To verify vtoc sanity */
41                     __be32 reserved[10]; /* Free space */
42                     __be32 timestamp[8]; /* Partition timestamp */
43                 } vtoc;
44                 __be32 write_reinstruct; /* sectors to skip, writes */
45                 __be32 read_reinstruct;  /* sectors to skip, reads */
46                 unsigned char spare[148]; /* Padding */
47                 __be16 rspeed;     /* Disk rotational speed */
48                 __be16 pcylcount;  /* Physical cylinder count */
49                 __be16 sparecyl;   /* extra sects per cylinder */
50                 __be16 obs1;       /* gap1 */
51                 __be16 obs2;       /* gap2 */
52                 __be16 ilfact;     /* Interleave factor */
53                 __be16 ncyl;       /* Data cylinder count */
54                 __be16 nacyl;      /* Alt. cylinder count */
55                 __be16 ntrks;      /* Tracks per cylinder */
56                 __be16 nsect;      /* Sectors per track */
57                 __be16 obs3;       /* bhead - Label head offset */
58                 __be16 obs4;       /* ppart - Physical Partition */
59                 struct sun_partition {
60                         __be32 start_cylinder;
61                         __be32 num_sectors;
62                 } partitions[8];
63                 __be16 magic;      /* Magic number */
64                 __be16 csum;       /* Label xor'd checksum */
65         } * label;
66         struct sun_partition *p;
67         unsigned long spc;
68         int use_vtoc;
69         int nparts;
70
71         label = read_part_sector(state, 0, &sect);
72         if (!label)
73                 return -1;
74
75         p = label->partitions;
76         if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
77 /*              printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
78                        state->disk->disk_name, be16_to_cpu(label->magic)); */
79                 put_dev_sector(sect);
80                 return 0;
81         }
82         /* Look at the checksum */
83         ush = ((__be16 *) (label+1)) - 1;
84         for (csum = 0; ush >= ((__be16 *) label);)
85                 csum ^= *ush--;
86         if (csum) {
87                 printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
88                        state->disk->disk_name);
89                 put_dev_sector(sect);
90                 return 0;
91         }
92
93         /* Check to see if we can use the VTOC table */
94         use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
95                     (be32_to_cpu(label->vtoc.version) == 1) &&
96                     (be16_to_cpu(label->vtoc.nparts) <= 8));
97
98         /* Use 8 partition entries if not specified in validated VTOC */
99         nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
100
101         /*
102          * So that old Linux-Sun partitions continue to work,
103          * alow the VTOC to be used under the additional condition ...
104          */
105         use_vtoc = use_vtoc || !(label->vtoc.sanity ||
106                                  label->vtoc.version || label->vtoc.nparts);
107         spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
108         for (i = 0; i < nparts; i++, p++) {
109                 unsigned long st_sector;
110                 unsigned int num_sectors;
111
112                 st_sector = be32_to_cpu(p->start_cylinder) * spc;
113                 num_sectors = be32_to_cpu(p->num_sectors);
114                 if (num_sectors) {
115                         put_partition(state, slot, st_sector, num_sectors);
116                         state->parts[slot].flags = 0;
117                         if (use_vtoc) {
118                                 if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
119                                         state->parts[slot].flags |= ADDPART_FLAG_RAID;
120                                 else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
121                                         state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
122                         }
123                 }
124                 slot++;
125         }
126         strlcat(state->pp_buf, "\n", PAGE_SIZE);
127         put_dev_sector(sect);
128         return 1;
129 }