/* bsdlabel.c - Read BSD style partition tables. */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 2002,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc. * * GRUB is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GRUB is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GRUB. If not, see <http://www.gnu.org/licenses/>. */ #include <grub/partition.h> #include <grub/bsdlabel.h> #include <grub/disk.h> #include <grub/mm.h> #include <grub/misc.h> #include <grub/dl.h> static struct grub_partition_map grub_bsdlabel_partition_map; static grub_err_t bsdlabel_partition_map_iterate (grub_disk_t disk, int (*hook) (grub_disk_t disk, const grub_partition_t partition)) { struct grub_partition_bsd_disk_label label; struct grub_partition p; grub_disk_addr_t delta = 0; unsigned pos; /* BSDLabel offsets are absolute even when it's embed inside partition. */ delta = grub_partition_get_start (disk->partition); /* Read the BSD label. */ if (grub_disk_read (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, sizeof (label), &label)) return grub_errno; /* Check if it is valid. */ if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC)) return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature"); pos = sizeof (label) + GRUB_PC_PARTITION_BSD_LABEL_SECTOR * GRUB_DISK_SECTOR_SIZE; for (p.number = 0; p.number < grub_cpu_to_le16 (label.num_partitions); p.number++) { struct grub_partition_bsd_entry be; p.offset = pos / GRUB_DISK_SECTOR_SIZE; p.index = pos % GRUB_DISK_SECTOR_SIZE; if (grub_disk_read (disk, p.offset, p.index, sizeof (be), &be)) return grub_errno; p.start = grub_le_to_cpu32 (be.offset) - delta; p.len = grub_le_to_cpu32 (be.size); p.partmap = &grub_bsdlabel_partition_map; if (be.fs_type != GRUB_PC_PARTITION_BSD_TYPE_UNUSED) if (hook (disk, &p)) return grub_errno; pos += sizeof (struct grub_partition_bsd_entry); } return GRUB_ERR_NONE; } /* Partition map type. */ static struct grub_partition_map grub_bsdlabel_partition_map = { .name = "bsd", .iterate = bsdlabel_partition_map_iterate, }; GRUB_MOD_INIT(part_bsd) { grub_partition_map_register (&grub_bsdlabel_partition_map); } GRUB_MOD_FINI(part_bsd) { grub_partition_map_unregister (&grub_bsdlabel_partition_map); }