From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/partmap/dvh.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 grub-core/partmap/dvh.c (limited to 'grub-core/partmap/dvh.c') diff --git a/grub-core/partmap/dvh.c b/grub-core/partmap/dvh.c new file mode 100644 index 0000000..95c9618 --- /dev/null +++ b/grub-core/partmap/dvh.c @@ -0,0 +1,127 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2005,2006,2007,2011 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 . + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define DVH_MAGIC 0x0be5a941 + +struct grub_dvh_partition_descriptor +{ + grub_uint32_t length; + grub_uint32_t start; + grub_uint32_t type; +} GRUB_PACKED; + +struct grub_dvh_block +{ + grub_uint32_t magic; + grub_uint8_t unused[308]; + struct grub_dvh_partition_descriptor parts[16]; + grub_uint32_t checksum; + grub_uint32_t unused2; +} GRUB_PACKED; + +static struct grub_partition_map grub_dvh_partition_map; + +/* Verify checksum (true=ok). */ +static int +grub_dvh_is_valid (grub_uint32_t *label) +{ + grub_uint32_t *pos; + grub_uint32_t sum = 0; + + for (pos = label; + pos < (label + sizeof (struct grub_dvh_block) / 4); + pos++) + sum += grub_be_to_cpu32 (*pos); + + return ! sum; +} + +static grub_err_t +dvh_partition_map_iterate (grub_disk_t disk, + grub_partition_iterate_hook_t hook, void *hook_data) +{ + struct grub_partition p; + union + { + struct grub_dvh_block dvh; + grub_uint32_t raw[0]; + } block; + unsigned partnum; + grub_err_t err; + + p.partmap = &grub_dvh_partition_map; + err = grub_disk_read (disk, 0, 0, sizeof (struct grub_dvh_block), + &block); + if (err) + return err; + + if (DVH_MAGIC != grub_be_to_cpu32 (block.dvh.magic)) + return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a dvh partition table"); + + if (! grub_dvh_is_valid (block.raw)) + return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum"); + + /* Maybe another error value would be better, because partition + table _is_ recognized but invalid. */ + for (partnum = 0; partnum < ARRAY_SIZE (block.dvh.parts); partnum++) + { + if (block.dvh.parts[partnum].length == 0) + continue; + + if (partnum == 10) + continue; + + p.start = grub_be_to_cpu32 (block.dvh.parts[partnum].start); + p.len = grub_be_to_cpu32 (block.dvh.parts[partnum].length); + p.number = p.index = partnum; + if (hook (disk, &p, hook_data)) + break; + } + + return grub_errno; +} + + +/* Partition map type. */ +static struct grub_partition_map grub_dvh_partition_map = + { + .name = "dvh", + .iterate = dvh_partition_map_iterate, + }; + +GRUB_MOD_INIT(part_dvh) +{ + grub_partition_map_register (&grub_dvh_partition_map); +} + +GRUB_MOD_FINI(part_dvh) +{ + grub_partition_map_unregister (&grub_dvh_partition_map); +} + -- cgit v1.2.3