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experimental support for chromium os (fydeos/cloudready)
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/* 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/>. | ||
*/ | ||
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#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> | ||
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GRUB_MOD_LICENSE ("GPLv3+"); | ||
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static grub_uint8_t grub_gpt_magic[8] = | ||
{ | ||
0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54 | ||
}; | ||
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static const grub_gpt_part_guid_t grub_gpt_partition_type_empty = GRUB_GPT_PARTITION_TYPE_EMPTY; | ||
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#ifdef GRUB_UTIL | ||
static const grub_gpt_part_guid_t grub_gpt_partition_type_bios_boot = GRUB_GPT_PARTITION_TYPE_BIOS_BOOT; | ||
#endif | ||
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/* 512 << 7 = 65536 byte sectors. */ | ||
#define MAX_SECTOR_LOG 7 | ||
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static struct grub_partition_map grub_gpt_partition_map; | ||
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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; | ||
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/* Read the protective MBR. */ | ||
if (grub_disk_read (disk, 0, 0, sizeof (mbr), &mbr)) | ||
return grub_errno; | ||
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/* Check if it is valid. */ | ||
if (mbr.signature != grub_cpu_to_le16_compile_time (GRUB_PC_PARTITION_SIGNATURE)) | ||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature"); | ||
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/* 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"); | ||
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/* 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; | ||
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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"); | ||
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grub_dprintf ("gpt", "Read a valid GPT header\n"); | ||
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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; | ||
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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; | ||
part.gpt_attrib = entry.attrib; | ||
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grub_dprintf ("gpt", "GPT entry %d: start=%lld, length=%lld\n", i, | ||
(unsigned long long) part.start, | ||
(unsigned long long) part.len); | ||
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if (hook (disk, &part, hook_data)) | ||
return grub_errno; | ||
} | ||
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last_offset += grub_le_to_cpu32 (gpt.partentry_size); | ||
if (last_offset == GRUB_DISK_SECTOR_SIZE) | ||
{ | ||
last_offset = 0; | ||
entries++; | ||
} | ||
} | ||
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return GRUB_ERR_NONE; | ||
} | ||
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#ifdef GRUB_UTIL | ||
/* Context for gpt_partition_map_embed. */ | ||
struct gpt_partition_map_embed_ctx | ||
{ | ||
grub_disk_addr_t start, len; | ||
}; | ||
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/* 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; | ||
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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; | ||
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/* 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; | ||
} | ||
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return 0; | ||
} | ||
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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; | ||
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if (embed_type != GRUB_EMBED_PCBIOS) | ||
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, | ||
"GPT currently supports only PC-BIOS embedding"); | ||
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err = grub_gpt_partition_map_iterate (disk, find_usable_region, &ctx); | ||
if (err) | ||
return err; | ||
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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")); | ||
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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")); | ||
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*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; | ||
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return GRUB_ERR_NONE; | ||
} | ||
#endif | ||
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/* 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 | ||
}; | ||
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GRUB_MOD_INIT(part_gpt) | ||
{ | ||
grub_partition_map_register (&grub_gpt_partition_map); | ||
} | ||
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GRUB_MOD_FINI(part_gpt) | ||
{ | ||
grub_partition_map_unregister (&grub_gpt_partition_map); | ||
} |
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