154 lines
4.6 KiB
C
154 lines
4.6 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2005,2006,2007,2008 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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#ifndef GRUB_GPT_PARTITION_HEADER
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#define GRUB_GPT_PARTITION_HEADER 1
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#include <grub/types.h>
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#include <grub/partition.h>
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#include <grub/msdos_partition.h>
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struct grub_gpt_part_type
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{
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grub_uint32_t data1;
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grub_uint16_t data2;
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grub_uint16_t data3;
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grub_uint8_t data4[8];
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} __attribute__ ((aligned(8)));
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typedef struct grub_gpt_part_type grub_gpt_part_type_t;
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#define GRUB_GPT_PARTITION_TYPE_EMPTY \
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{ 0x0, 0x0, 0x0, \
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{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } \
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}
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#define GRUB_GPT_PARTITION_TYPE_BIOS_BOOT \
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{ grub_cpu_to_le32_compile_time (0x21686148), \
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grub_cpu_to_le16_compile_time (0x6449), \
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grub_cpu_to_le16_compile_time (0x6e6f), \
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{ 0x74, 0x4e, 0x65, 0x65, 0x64, 0x45, 0x46, 0x49 } \
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}
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#define GRUB_GPT_PARTITION_TYPE_LDM \
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{ grub_cpu_to_le32_compile_time (0x5808C8AAU),\
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grub_cpu_to_le16_compile_time (0x7E8F), \
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grub_cpu_to_le16_compile_time (0x42E0), \
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{ 0x85, 0xD2, 0xE1, 0xE9, 0x04, 0x34, 0xCF, 0xB3 } \
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}
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#define GRUB_GPT_HEADER_MAGIC \
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{ 0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54 }
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#define GRUB_GPT_HEADER_VERSION \
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grub_cpu_to_le32_compile_time (0x00010000U)
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struct grub_gpt_header
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{
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grub_uint8_t magic[8];
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grub_uint32_t version;
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grub_uint32_t headersize;
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grub_uint32_t crc32;
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grub_uint32_t unused1;
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grub_uint64_t header_lba;
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grub_uint64_t alternate_lba;
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grub_uint64_t start;
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grub_uint64_t end;
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grub_uint8_t guid[16];
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grub_uint64_t partitions;
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grub_uint32_t maxpart;
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grub_uint32_t partentry_size;
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grub_uint32_t partentry_crc32;
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} GRUB_PACKED;
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struct grub_gpt_partentry
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{
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grub_gpt_part_type_t type;
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grub_uint8_t guid[16];
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grub_uint64_t start;
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grub_uint64_t end;
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grub_uint64_t attrib;
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char name[72];
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} GRUB_PACKED;
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/* Basic GPT partmap module. */
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grub_err_t
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grub_gpt_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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/* Advanced GPT library. */
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typedef enum grub_gpt_status
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{
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GRUB_GPT_PROTECTIVE_MBR = 0x01,
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GRUB_GPT_HYBRID_MBR = 0x02,
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GRUB_GPT_PRIMARY_HEADER_VALID = 0x04,
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GRUB_GPT_PRIMARY_ENTRIES_VALID = 0x08,
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GRUB_GPT_BACKUP_HEADER_VALID = 0x10,
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GRUB_GPT_BACKUP_ENTRIES_VALID = 0x20,
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} grub_gpt_status_t;
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#define GRUB_GPT_MBR_VALID (GRUB_GPT_PROTECTIVE_MBR|GRUB_GPT_HYBRID_MBR)
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/* UEFI requires the entries table to be at least 16384 bytes for a
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* total of 128 entries given the standard 128 byte entry size. */
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#define GRUB_GPT_DEFAULT_ENTRIES_SIZE 16384
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#define GRUB_GPT_DEFAULT_ENTRIES_LENGTH \
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(GRUB_GPT_DEFAULT_ENTRIES_SIZE / sizeof (struct grub_gpt_partentry))
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struct grub_gpt
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{
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/* Bit field indicating which structures on disk are valid. */
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grub_gpt_status_t status;
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/* Protective or hybrid MBR. */
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struct grub_msdos_partition_mbr mbr;
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/* Each of the two GPT headers. */
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struct grub_gpt_header primary;
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struct grub_gpt_header backup;
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/* Only need one entries table, on disk both copies are identical. */
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struct grub_gpt_partentry *entries;
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grub_size_t entries_size;
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/* Logarithm of sector size, in case GPT and disk driver disagree. */
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unsigned int log_sector_size;
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};
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typedef struct grub_gpt *grub_gpt_t;
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/* Translate GPT sectors to GRUB's 512 byte block addresses. */
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static inline grub_disk_addr_t
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grub_gpt_sector_to_addr (grub_gpt_t gpt, grub_uint64_t sector)
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{
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return (sector << (gpt->log_sector_size - GRUB_DISK_SECTOR_BITS));
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}
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/* Allocates and fills new grub_gpt structure, free with grub_gpt_free. */
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grub_gpt_t grub_gpt_read (grub_disk_t disk);
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/* Sync up primary and backup headers, recompute checksums. */
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grub_err_t grub_gpt_repair (grub_disk_t disk, grub_gpt_t gpt);
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void grub_gpt_free (grub_gpt_t gpt);
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grub_err_t grub_gpt_pmbr_check (struct grub_msdos_partition_mbr *mbr);
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grub_err_t grub_gpt_header_check (struct grub_gpt_header *gpt,
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unsigned int log_sector_size);
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#endif /* ! GRUB_GPT_PARTITION_HEADER */
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