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c0364ce1c6
When setting aside a GPT partition for holding the U-Boot environment,
having a partition type GUID [1] indicating "Linux filesystem" (as
most tools default to) is somewhat misleading - and there's no other
well-known type GUID that is better suited. So to have a canonical
value to put into the type field, define
3de21764-95bd-54bd-a5c3-4abe786f38a8
to mean a partition holding a U-Boot environment.
This is a v5 namespace-name GUID [2], generated [3] from a namespace
of "25cbcde0-8642-47c6-a298-1a3a57cd256b" and name "U-Boot
environment".
Should future type GUIDs be defined in the context of U-Boot, it's
sensible to use that same namespace GUID.
[1] https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_type_GUIDs
[2] https://en.wikipedia.org/wiki/Universally_unique_identifier#Versions_3_and_5_(namespace_name-based)
[3] https://www.uuidtools.com/v5
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2008 RuggedCom, Inc.
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* Richard Retanubun <RichardRetanubun@RuggedCom.com>
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*/
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/*
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* See also linux/fs/partitions/efi.h
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*
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* EFI GUID Partition Table
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* Per Intel EFI Specification v1.02
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* http://developer.intel.com/technology/efi/efi.htm
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*/
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#include <linux/compiler.h>
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#ifndef _DISK_PART_EFI_H
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#define _DISK_PART_EFI_H
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#include <efi.h>
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#define MSDOS_MBR_SIGNATURE 0xAA55
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#define MSDOS_MBR_BOOT_CODE_SIZE 440
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#define EFI_PMBR_OSTYPE_EFI 0xEF
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#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
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#define GPT_HEADER_SIGNATURE_UBOOT 0x5452415020494645ULL // 'EFI PART'
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#define GPT_HEADER_CHROMEOS_IGNORE 0x454d45524f4e4749ULL // 'IGNOREME'
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#define GPT_HEADER_REVISION_V1 0x00010000
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#define GPT_PRIMARY_PARTITION_TABLE_LBA 1ULL
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#define GPT_ENTRY_NUMBERS CONFIG_EFI_PARTITION_ENTRIES_NUMBERS
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#define GPT_ENTRY_SIZE 128
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#define PARTITION_SYSTEM_GUID \
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EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
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0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
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#define LEGACY_MBR_PARTITION_GUID \
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EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
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0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
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#define PARTITION_MSFT_RESERVED_GUID \
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EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
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0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
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#define PARTITION_BASIC_DATA_GUID \
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EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
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0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
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#define PARTITION_LINUX_FILE_SYSTEM_DATA_GUID \
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EFI_GUID(0x0FC63DAF, 0x8483, 0x4772, \
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0x8E, 0x79, 0x3D, 0x69, 0xD8, 0x47, 0x7D, 0xE4)
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#define PARTITION_LINUX_RAID_GUID \
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EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
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0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
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#define PARTITION_LINUX_SWAP_GUID \
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EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
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0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
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#define PARTITION_LINUX_LVM_GUID \
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EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
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0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
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#define PARTITION_U_BOOT_ENVIRONMENT \
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EFI_GUID( 0x3de21764, 0x95bd, 0x54bd, \
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0xa5, 0xc3, 0x4a, 0xbe, 0x78, 0x6f, 0x38, 0xa8)
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/* linux/include/efi.h */
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typedef u16 efi_char16_t;
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/* based on linux/include/genhd.h */
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struct partition {
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u8 boot_ind; /* 0x80 - active */
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u8 head; /* starting head */
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u8 sector; /* starting sector */
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u8 cyl; /* starting cylinder */
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u8 sys_ind; /* What partition type */
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u8 end_head; /* end head */
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u8 end_sector; /* end sector */
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u8 end_cyl; /* end cylinder */
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__le32 start_sect; /* starting sector counting from 0 */
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__le32 nr_sects; /* nr of sectors in partition */
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} __packed;
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/* based on linux/fs/partitions/efi.h */
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typedef struct _gpt_header {
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__le64 signature;
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__le32 revision;
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__le32 header_size;
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__le32 header_crc32;
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__le32 reserved1;
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__le64 my_lba;
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__le64 alternate_lba;
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__le64 first_usable_lba;
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__le64 last_usable_lba;
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efi_guid_t disk_guid;
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__le64 partition_entry_lba;
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__le32 num_partition_entries;
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__le32 sizeof_partition_entry;
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__le32 partition_entry_array_crc32;
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} __packed gpt_header;
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typedef union _gpt_entry_attributes {
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struct {
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u64 required_to_function:1;
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u64 no_block_io_protocol:1;
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u64 legacy_bios_bootable:1;
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u64 reserved:45;
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u64 type_guid_specific:16;
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} fields;
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unsigned long long raw;
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} __packed gpt_entry_attributes;
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#define PARTNAME_SZ (72 / sizeof(efi_char16_t))
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typedef struct _gpt_entry {
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efi_guid_t partition_type_guid;
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efi_guid_t unique_partition_guid;
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__le64 starting_lba;
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__le64 ending_lba;
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gpt_entry_attributes attributes;
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efi_char16_t partition_name[PARTNAME_SZ];
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} __packed gpt_entry;
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typedef struct _legacy_mbr {
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u8 boot_code[MSDOS_MBR_BOOT_CODE_SIZE];
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__le32 unique_mbr_signature;
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__le16 unknown;
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struct partition partition_record[4];
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__le16 signature;
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} __packed legacy_mbr;
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#endif /* _DISK_PART_EFI_H */
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