149 lines
4.4 KiB
C
149 lines
4.4 KiB
C
/* sun.c - Read SUN style partition tables. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2005,2006,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/partition.h>
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#include <grub/disk.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/dl.h>
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#include <grub/symbol.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#define GRUB_PARTMAP_SUN_MAGIC 0xDABE
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#define GRUB_PARTMAP_SUN_MAX_PARTS 8
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#define GRUB_PARTMAP_SUN_WHOLE_DISK_ID 0x05
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struct grub_sun_partition_info
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{
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grub_uint8_t spare1;
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grub_uint8_t id;
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grub_uint8_t spare2;
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grub_uint8_t flags;
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} __attribute__ ((packed));
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struct grub_sun_partition_descriptor
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{
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grub_uint32_t start_cylinder;
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grub_uint32_t num_sectors;
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} __attribute__ ((packed));
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struct grub_sun_block
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{
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grub_uint8_t info[128]; /* Informative text string. */
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grub_uint8_t spare0[14];
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struct grub_sun_partition_info infos[8];
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grub_uint8_t spare1[246]; /* Boot information etc. */
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grub_uint16_t rspeed; /* Disk rotational speed. */
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grub_uint16_t pcylcount; /* Physical cylinder count. */
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grub_uint16_t sparecyl; /* extra sects per cylinder. */
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grub_uint8_t spare2[4]; /* More magic... */
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grub_uint16_t ilfact; /* Interleave factor. */
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grub_uint16_t ncyl; /* Data cylinder count. */
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grub_uint16_t nacyl; /* Alt. cylinder count. */
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grub_uint16_t ntrks; /* Tracks per cylinder. */
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grub_uint16_t nsect; /* Sectors per track. */
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grub_uint8_t spare3[4]; /* Even more magic... */
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struct grub_sun_partition_descriptor partitions[8];
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grub_uint16_t magic; /* Magic number. */
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grub_uint16_t csum; /* Label xor'd checksum. */
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} __attribute__ ((packed));
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static struct grub_partition_map grub_sun_partition_map;
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/* Verify checksum (true=ok). */
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static int
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grub_sun_is_valid (struct grub_sun_block *label)
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{
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grub_uint16_t *pos;
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grub_uint16_t sum = 0;
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for (pos = (grub_uint16_t *) label;
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pos < (grub_uint16_t *) (label + 1);
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pos++)
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sum ^= *pos;
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return ! sum;
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}
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static grub_err_t
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sun_partition_map_iterate (grub_disk_t disk,
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int (*hook) (grub_disk_t disk,
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const grub_partition_t partition))
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{
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struct grub_partition p;
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struct grub_sun_block block;
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int partnum;
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grub_err_t err;
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p.partmap = &grub_sun_partition_map;
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err = grub_disk_read (disk, 0, 0, sizeof (struct grub_sun_block),
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&block);
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if (err)
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return err;
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if (GRUB_PARTMAP_SUN_MAGIC != grub_be_to_cpu16 (block.magic))
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a sun partition table");
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if (! grub_sun_is_valid (&block))
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
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/* Maybe another error value would be better, because partition
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table _is_ recognized but invalid. */
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for (partnum = 0; partnum < GRUB_PARTMAP_SUN_MAX_PARTS; partnum++)
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{
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struct grub_sun_partition_descriptor *desc;
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if (block.infos[partnum].id == 0
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|| block.infos[partnum].id == GRUB_PARTMAP_SUN_WHOLE_DISK_ID)
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continue;
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desc = &block.partitions[partnum];
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p.start = ((grub_uint64_t) grub_be_to_cpu32 (desc->start_cylinder)
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* grub_be_to_cpu16 (block.ntrks)
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* grub_be_to_cpu16 (block.nsect));
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p.len = grub_be_to_cpu32 (desc->num_sectors);
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p.number = p.index = partnum;
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if (p.len)
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{
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if (hook (disk, &p))
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partnum = GRUB_PARTMAP_SUN_MAX_PARTS;
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}
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}
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return grub_errno;
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}
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/* Partition map type. */
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static struct grub_partition_map grub_sun_partition_map =
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{
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.name = "sun",
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.iterate = sun_partition_map_iterate,
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};
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GRUB_MOD_INIT(part_sun)
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{
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grub_partition_map_register (&grub_sun_partition_map);
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}
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GRUB_MOD_FINI(part_sun)
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{
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grub_partition_map_unregister (&grub_sun_partition_map);
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}
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