25239370fd
* include/grub/arc/arc.h (grub_arc_iterate_devs_hook_t): New type. (grub_arc_iterate_devs): Add hook_data argument. * include/grub/ata.h (grub_ata_dev_iterate_hook_t): New type. (struct grub_ata_dev.iterate): Add hook_data argument. * include/grub/device.h (grub_device_iterate_hook_t): New type. (grub_device_iterate): Add hook_data argument. * include/grub/disk.h (grub_disk_dev_iterate_hook_t): New type. (struct grub_disk_dev.iterate): Add hook_data argument. (grub_disk_dev_iterate): Likewise. * include/grub/gpt_partition.h (grub_gpt_partition_map_iterate): Likewise. * include/grub/msdos_partition.h (grub_partition_msdos_iterate): Likewise. * include/grub/partition.h (grub_partition_iterate_hook_t): New type. (struct grub_partition_map.iterate): Add hook_data argument. (grub_partition_iterate): Likewise. * include/grub/scsi.h (grub_scsi_dev_iterate_hook_t): New type. (struct grub_scsi_dev.iterate): Add hook_data argument. Update all callers.
231 lines
6.3 KiB
C
231 lines
6.3 KiB
C
/* gpt.c - Read GUID Partition Tables (GPT). */
|
||
/*
|
||
* GRUB -- GRand Unified Bootloader
|
||
* Copyright (C) 2002,2005,2006,2007,2008 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/disk.h>
|
||
#include <grub/misc.h>
|
||
#include <grub/mm.h>
|
||
#include <grub/partition.h>
|
||
#include <grub/dl.h>
|
||
#include <grub/msdos_partition.h>
|
||
#include <grub/gpt_partition.h>
|
||
#include <grub/i18n.h>
|
||
|
||
GRUB_MOD_LICENSE ("GPLv3+");
|
||
|
||
static grub_uint8_t grub_gpt_magic[8] =
|
||
{
|
||
0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54
|
||
};
|
||
|
||
static const grub_gpt_part_type_t grub_gpt_partition_type_empty = GRUB_GPT_PARTITION_TYPE_EMPTY;
|
||
|
||
#ifdef GRUB_UTIL
|
||
static const grub_gpt_part_type_t grub_gpt_partition_type_bios_boot = GRUB_GPT_PARTITION_TYPE_BIOS_BOOT;
|
||
#endif
|
||
|
||
/* 512 << 7 = 65536 byte sectors. */
|
||
#define MAX_SECTOR_LOG 7
|
||
|
||
static struct grub_partition_map grub_gpt_partition_map;
|
||
|
||
|
||
|
||
grub_err_t
|
||
grub_gpt_partition_map_iterate (grub_disk_t disk,
|
||
grub_partition_iterate_hook_t hook,
|
||
void *hook_data)
|
||
{
|
||
struct grub_partition part;
|
||
struct grub_gpt_header gpt;
|
||
struct grub_gpt_partentry entry;
|
||
struct grub_msdos_partition_mbr mbr;
|
||
grub_uint64_t entries;
|
||
unsigned int i;
|
||
int last_offset = 0;
|
||
int sector_log = 0;
|
||
|
||
/* Read the protective MBR. */
|
||
if (grub_disk_read (disk, 0, 0, sizeof (mbr), &mbr))
|
||
return grub_errno;
|
||
|
||
/* Check if it is valid. */
|
||
if (mbr.signature != grub_cpu_to_le16 (GRUB_PC_PARTITION_SIGNATURE))
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
|
||
|
||
/* Make sure the MBR is a protective MBR and not a normal MBR. */
|
||
for (i = 0; i < 4; i++)
|
||
if (mbr.entries[i].type == GRUB_PC_PARTITION_TYPE_GPT_DISK)
|
||
break;
|
||
if (i == 4)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no GPT partition map found");
|
||
|
||
/* Read the GPT header. */
|
||
for (sector_log = 0; sector_log < MAX_SECTOR_LOG; sector_log++)
|
||
{
|
||
if (grub_disk_read (disk, 1 << sector_log, 0, sizeof (gpt), &gpt))
|
||
return grub_errno;
|
||
|
||
if (grub_memcmp (gpt.magic, grub_gpt_magic, sizeof (grub_gpt_magic)) == 0)
|
||
break;
|
||
}
|
||
if (sector_log == MAX_SECTOR_LOG)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no valid GPT header");
|
||
|
||
grub_dprintf ("gpt", "Read a valid GPT header\n");
|
||
|
||
entries = grub_le_to_cpu64 (gpt.partitions) << sector_log;
|
||
for (i = 0; i < grub_le_to_cpu32 (gpt.maxpart); i++)
|
||
{
|
||
if (grub_disk_read (disk, entries, last_offset,
|
||
sizeof (entry), &entry))
|
||
return grub_errno;
|
||
|
||
if (grub_memcmp (&grub_gpt_partition_type_empty, &entry.type,
|
||
sizeof (grub_gpt_partition_type_empty)))
|
||
{
|
||
/* Calculate the first block and the size of the partition. */
|
||
part.start = grub_le_to_cpu64 (entry.start) << sector_log;
|
||
part.len = (grub_le_to_cpu64 (entry.end)
|
||
- grub_le_to_cpu64 (entry.start) + 1) << sector_log;
|
||
part.offset = entries;
|
||
part.number = i;
|
||
part.index = last_offset;
|
||
part.partmap = &grub_gpt_partition_map;
|
||
part.parent = disk->partition;
|
||
|
||
grub_dprintf ("gpt", "GPT entry %d: start=%lld, length=%lld\n", i,
|
||
(unsigned long long) part.start,
|
||
(unsigned long long) part.len);
|
||
|
||
if (hook (disk, &part, hook_data))
|
||
return grub_errno;
|
||
}
|
||
|
||
last_offset += grub_le_to_cpu32 (gpt.partentry_size);
|
||
if (last_offset == GRUB_DISK_SECTOR_SIZE)
|
||
{
|
||
last_offset = 0;
|
||
entries++;
|
||
}
|
||
}
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
#ifdef GRUB_UTIL
|
||
/* Context for gpt_partition_map_embed. */
|
||
struct gpt_partition_map_embed_ctx
|
||
{
|
||
grub_disk_addr_t start, len;
|
||
};
|
||
|
||
/* Helper for gpt_partition_map_embed. */
|
||
static int
|
||
find_usable_region (grub_disk_t disk __attribute__ ((unused)),
|
||
const grub_partition_t p, void *data)
|
||
{
|
||
struct gpt_partition_map_embed_ctx *ctx = data;
|
||
struct grub_gpt_partentry gptdata;
|
||
grub_partition_t p2;
|
||
|
||
p2 = disk->partition;
|
||
disk->partition = p->parent;
|
||
if (grub_disk_read (disk, p->offset, p->index,
|
||
sizeof (gptdata), &gptdata))
|
||
{
|
||
disk->partition = p2;
|
||
return 0;
|
||
}
|
||
disk->partition = p2;
|
||
|
||
/* If there's an embed region, it is in a dedicated partition. */
|
||
if (! grub_memcmp (&gptdata.type, &grub_gpt_partition_type_bios_boot, 16))
|
||
{
|
||
ctx->start = p->start;
|
||
ctx->len = p->len;
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
gpt_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors,
|
||
unsigned int max_nsectors,
|
||
grub_embed_type_t embed_type,
|
||
grub_disk_addr_t **sectors)
|
||
{
|
||
struct gpt_partition_map_embed_ctx ctx = {
|
||
.start = 0,
|
||
.len = 0
|
||
};
|
||
unsigned i;
|
||
grub_err_t err;
|
||
|
||
if (embed_type != GRUB_EMBED_PCBIOS)
|
||
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
|
||
"GPT currently supports only PC-BIOS embedding");
|
||
|
||
err = grub_gpt_partition_map_iterate (disk, find_usable_region, &ctx);
|
||
if (err)
|
||
return err;
|
||
|
||
if (ctx.len == 0)
|
||
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
|
||
N_("this GPT partition label contains no BIOS Boot Partition;"
|
||
" embedding won't be possible"));
|
||
|
||
if (ctx.len < *nsectors)
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
N_("your BIOS Boot Partition is too small;"
|
||
" embedding won't be possible"));
|
||
|
||
*nsectors = ctx.len;
|
||
if (*nsectors > max_nsectors)
|
||
*nsectors = max_nsectors;
|
||
*sectors = grub_malloc (*nsectors * sizeof (**sectors));
|
||
if (!*sectors)
|
||
return grub_errno;
|
||
for (i = 0; i < *nsectors; i++)
|
||
(*sectors)[i] = ctx.start + i;
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Partition map type. */
|
||
static struct grub_partition_map grub_gpt_partition_map =
|
||
{
|
||
.name = "gpt",
|
||
.iterate = grub_gpt_partition_map_iterate,
|
||
#ifdef GRUB_UTIL
|
||
.embed = gpt_partition_map_embed
|
||
#endif
|
||
};
|
||
|
||
GRUB_MOD_INIT(part_gpt)
|
||
{
|
||
grub_partition_map_register (&grub_gpt_partition_map);
|
||
}
|
||
|
||
GRUB_MOD_FINI(part_gpt)
|
||
{
|
||
grub_partition_map_unregister (&grub_gpt_partition_map);
|
||
}
|