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152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/* sunpc.c - Read SUN PC style partition tables. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2005,2006,2007,2009 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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GRUB_MOD_LICENSE ("GPLv3+");
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#define GRUB_PARTMAP_SUN_PC_MAGIC 0xDABE
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#define GRUB_PARTMAP_SUN_PC_MAX_PARTS 16
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#define GRUB_PARTMAP_SUN_PC_WHOLE_DISK_ID 0x05
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struct grub_sun_pc_partition_descriptor
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{
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grub_uint16_t id;
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grub_uint16_t unused;
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grub_uint32_t start_sector;
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grub_uint32_t num_sectors;
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} GRUB_PACKED;
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struct grub_sun_pc_block
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{
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grub_uint8_t unused[72];
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struct grub_sun_pc_partition_descriptor partitions[GRUB_PARTMAP_SUN_PC_MAX_PARTS];
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grub_uint8_t unused2[244];
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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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} GRUB_PACKED;
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static struct grub_partition_map grub_sun_pc_partition_map;
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/* Verify checksum (true=ok). */
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static int
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grub_sun_is_valid (grub_uint16_t *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 = label;
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pos < (label + sizeof (struct grub_sun_pc_block) / 2);
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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_pc_partition_map_iterate (grub_disk_t disk,
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grub_partition_iterate_hook_t hook,
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void *hook_data)
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{
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grub_partition_t p;
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union
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{
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struct grub_sun_pc_block sun;
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grub_uint16_t raw[0];
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} block;
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int partnum;
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grub_err_t err;
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p = (grub_partition_t) grub_zalloc (sizeof (struct grub_partition));
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if (! p)
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return grub_errno;
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p->partmap = &grub_sun_pc_partition_map;
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err = grub_disk_read (disk, 1, 0, sizeof (struct grub_sun_pc_block), &block);
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if (err)
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{
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grub_free (p);
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return err;
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}
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if (GRUB_PARTMAP_SUN_PC_MAGIC != grub_le_to_cpu16 (block.sun.magic))
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{
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grub_free (p);
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return grub_error (GRUB_ERR_BAD_PART_TABLE,
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"not a sun_pc partition table");
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}
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if (! grub_sun_is_valid (block.raw))
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{
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grub_free (p);
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
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}
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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_PC_MAX_PARTS; partnum++)
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{
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struct grub_sun_pc_partition_descriptor *desc;
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if (block.sun.partitions[partnum].id == 0
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|| block.sun.partitions[partnum].id
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== GRUB_PARTMAP_SUN_PC_WHOLE_DISK_ID)
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continue;
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desc = &block.sun.partitions[partnum];
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p->start = grub_le_to_cpu32 (desc->start_sector);
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p->len = grub_le_to_cpu32 (desc->num_sectors);
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p->number = partnum;
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if (p->len)
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{
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if (hook (disk, p, hook_data))
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partnum = GRUB_PARTMAP_SUN_PC_MAX_PARTS;
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}
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}
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grub_free (p);
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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_pc_partition_map =
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{
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.name = "sunpc",
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.iterate = sun_pc_partition_map_iterate,
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};
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GRUB_MOD_INIT(part_sunpc)
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{
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grub_partition_map_register (&grub_sun_pc_partition_map);
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}
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GRUB_MOD_FINI(part_sunpc)
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{
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grub_partition_map_unregister (&grub_sun_pc_partition_map);
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}
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