partmap/sun.c

   1 /* sun.c - Read SUN style partition tables.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2005,2006,2007  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/partition.h>
  21 #include <grub/disk.h>
  22 #include <grub/mm.h>
  23 #include <grub/misc.h>
  24 #include <grub/dl.h>
  25 #include <grub/symbol.h>
  26 #include <grub/types.h>
  27 #include <grub/err.h>
  28
  29 #define GRUB_PARTMAP_SUN_MAGIC 0xDABE
  30 #define GRUB_PARTMAP_SUN_MAX_PARTS 8
  31 #define GRUB_PARTMAP_SUN_WHOLE_DISK_ID 0x05
  32
  33 struct grub_sun_partition_info
  34 {
  35   grub_uint8_t spare1;
  36   grub_uint8_t id;
  37   grub_uint8_t spare2;
  38   grub_uint8_t flags;
  39 } __attribute__ ((packed));
  40
  41 struct grub_sun_partition_descriptor
  42 {
  43   grub_uint32_t start_cylinder;
  44   grub_uint32_t num_sectors;
  45 } __attribute__ ((packed));
  46
  47 struct grub_sun_block
  48 {
  49   grub_uint8_t  info[128];      /* Informative text string.  */
  50   grub_uint8_t  spare0[14];
  51   struct grub_sun_partition_info infos[8];
  52   grub_uint8_t  spare1[246];    /* Boot information etc.  */
  53   grub_uint16_t  rspeed;        /* Disk rotational speed.  */
  54   grub_uint16_t  pcylcount;     /* Physical cylinder count.  */
  55   grub_uint16_t  sparecyl;      /* extra sects per cylinder.  */
  56   grub_uint8_t  spare2[4];      /* More magic...  */
  57   grub_uint16_t  ilfact;        /* Interleave factor.  */
  58   grub_uint16_t  ncyl;          /* Data cylinder count.  */
  59   grub_uint16_t  nacyl;         /* Alt. cylinder count.  */
  60   grub_uint16_t  ntrks;         /* Tracks per cylinder.  */
  61   grub_uint16_t  nsect;         /* Sectors per track.  */
  62   grub_uint8_t  spare3[4];      /* Even more magic...  */
  63   struct grub_sun_partition_descriptor partitions[8];
  64   grub_uint16_t  magic;         /* Magic number.  */
  65   grub_uint16_t  csum;          /* Label xor'd checksum.  */
  66 } __attribute__ ((packed));
  67
  68 static struct grub_partition_map grub_sun_partition_map;
  69
  70 /* Verify checksum (true=ok).  */
  71 static int
  72 grub_sun_is_valid (struct grub_sun_block *label)
  73 {
  74   grub_uint16_t *pos;
  75   grub_uint16_t sum = 0;
  76
  77   for (pos = (grub_uint16_t *) label;
  78        pos < (grub_uint16_t *) (label + 1);
  79        pos++)
  80     sum ^= *pos;
  81
  82   return ! sum;
  83 }
  84
  85 static grub_err_t
  86 sun_partition_map_iterate (grub_disk_t disk,
  87                            int (*hook) (grub_disk_t disk,
  88                                         const grub_partition_t partition))
  89 {
  90   grub_partition_t p;
  91   struct grub_sun_block block;
  92   int partnum;
  93
  94   p = (grub_partition_t) grub_zalloc (sizeof (struct grub_partition));
  95   if (! p)
  96     return grub_errno;
  97
  98   p->partmap = &grub_sun_partition_map;
  99   if (grub_disk_read (disk, 0, 0, sizeof (struct grub_sun_block),
 100                       &block) == GRUB_ERR_NONE)
 101     {
 102       if (GRUB_PARTMAP_SUN_MAGIC != grub_be_to_cpu16 (block.magic))
 103         grub_error (GRUB_ERR_BAD_PART_TABLE, "not a sun partition table");
 104
 105       if (! grub_sun_is_valid (&block))
 106         grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
 107
 108       /* Maybe another error value would be better, because partition
 109          table _is_ recognized but invalid.  */
 110       for (partnum = 0; partnum < GRUB_PARTMAP_SUN_MAX_PARTS; partnum++)
 111         {
 112           struct grub_sun_partition_descriptor *desc;
 113
 114           if (block.infos[partnum].id == 0
 115               || block.infos[partnum].id == GRUB_PARTMAP_SUN_WHOLE_DISK_ID)
 116             continue;
 117
 118           desc = &block.partitions[partnum];
 119           p->start = ((grub_uint64_t) grub_be_to_cpu32 (desc->start_cylinder)
 120                       * grub_be_to_cpu16 (block.ntrks)
 121                       * grub_be_to_cpu16 (block.nsect));
 122           p->len = grub_be_to_cpu32 (desc->num_sectors);
 123           p->number = partnum;
 124           if (p->len)
 125             {
 126               if (hook (disk, p))
 127                 partnum = GRUB_PARTMAP_SUN_MAX_PARTS;
 128             }
 129         }
 130     }
 131
 132   grub_free (p);
 133
 134   return grub_errno;
 135 }
 136
 137 /* Partition map type.  */
 138 static struct grub_partition_map grub_sun_partition_map =
 139   {
 140     .name = "sun_partition_map",
 141     .iterate = sun_partition_map_iterate,
 142   };
 143
 144 GRUB_MOD_INIT(sun_partition_map)
 145 {
 146   grub_partition_map_register (&grub_sun_partition_map);
 147 }
 148
 149 GRUB_MOD_FINI(sun_partition_map)
 150 {
 151   grub_partition_map_unregister (&grub_sun_partition_map);
 152 }
 153