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Diffstat (limited to 'firmware/include/gpt.h')
| -rw-r--r-- | firmware/include/gpt.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/firmware/include/gpt.h b/firmware/include/gpt.h new file mode 100644 index 00000000..fa537397 --- /dev/null +++ b/firmware/include/gpt.h @@ -0,0 +1,114 @@ +/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * Defines EFI related structure. See more details in EFI 2.3 spec. + * + * To download EFI standard, please visit UEFI homepage: + * http://www.uefi.org/ + */ +#ifndef VBOOT_REFERENCE_CGPTLIB_GPT_H_ +#define VBOOT_REFERENCE_CGPTLIB_GPT_H_ +#include <stdint.h> + +#define GPT_HEADER_SIGNATURE "EFI PART" +#define GPT_HEADER_SIGNATURE2 "CHROMEOS" +#define GPT_HEADER_SIGNATURE_SIZE sizeof(GPT_HEADER_SIGNATURE) +#define GPT_HEADER_REVISION 0x00010000 + +/* + * The first 3 numbers should be stored in network-endian format according to + * the GUID RFC. The UEFI spec appendix A claims they should be stored in + * little-endian format. But they need to be _displayed_ in network-endian + * format, which is also how they're documented in the specs. + * + * Since what we have here are little-endian constants, they're byte-swapped + * from the normal display order. + */ +#define GPT_ENT_TYPE_UNUSED \ + {{{0x00000000,0x0000,0x0000,0x00,0x00,{0x00,0x00,0x00,0x00,0x00,0x00}}}} +#define GPT_ENT_TYPE_EFI \ + {{{0xc12a7328,0xf81f,0x11d2,0xba,0x4b,{0x00,0xa0,0xc9,0x3e,0xc9,0x3b}}}} +#define GPT_ENT_TYPE_CHROMEOS_FIRMWARE \ + {{{0xcab6e88e,0xabf3,0x4102,0xa0,0x7a,{0xd4,0xbb,0x9b,0xe3,0xc1,0xd3}}}} +#define GPT_ENT_TYPE_CHROMEOS_KERNEL \ + {{{0xfe3a2a5d,0x4f32,0x41a7,0xb7,0x25,{0xac,0xcc,0x32,0x85,0xa3,0x09}}}} +#define GPT_ENT_TYPE_CHROMEOS_ROOTFS \ + {{{0x3cb8e202,0x3b7e,0x47dd,0x8a,0x3c,{0x7f,0xf2,0xa1,0x3c,0xfc,0xec}}}} +#define GPT_ENT_TYPE_CHROMEOS_RESERVED \ + {{{0x2e0a753d,0x9e48,0x43b0,0x83,0x37,{0xb1,0x51,0x92,0xcb,0x1b,0x5e}}}} +#define GPT_ENT_TYPE_LINUX_DATA \ + {{{0xebd0a0a2,0xb9e5,0x4433,0x87,0xc0,{0x68,0xb6,0xb7,0x26,0x99,0xc7}}}} + +#define UUID_NODE_LEN 6 +#define GUID_SIZE 16 + +/* GUID definition. Defined in appendix A of EFI standard. */ +typedef struct { + union { + struct { + uint32_t time_low; + uint16_t time_mid; + uint16_t time_high_and_version; + uint8_t clock_seq_high_and_reserved; + uint8_t clock_seq_low; + uint8_t node[UUID_NODE_LEN]; + } Uuid; + uint8_t raw[GUID_SIZE]; + } u; +} __attribute__((packed)) Guid; + +#define GUID_EXPECTED_SIZE GUID_SIZE + +/* + * GPT header defines how many partitions exist on a drive and sectors managed. + * For every drive device, there are 2 headers, primary and secondary. Most of + * fields are duplicated except my_lba and entries_lba. + * + * You may find more details in chapter 5 of EFI standard. + */ +typedef struct { + char signature[8]; + uint32_t revision; + uint32_t size; + uint32_t header_crc32; + uint32_t reserved_zero; + uint64_t my_lba; + uint64_t alternate_lba; + uint64_t first_usable_lba; + uint64_t last_usable_lba; + Guid disk_uuid; + uint64_t entries_lba; + uint32_t number_of_entries; + uint32_t size_of_entry; + uint32_t entries_crc32; + /* Remainder of sector is reserved and should be 0 */ +} __attribute__((packed)) GptHeader; + +#define GPTHEADER_EXPECTED_SIZE 92 + +/* + * GPT partition entry defines the starting and ending LBAs of a partition. It + * also contains the unique GUID, type, and attribute bits. + * + * You may find more details in chapter 5 of EFI standard. + */ +typedef struct { + Guid type; + Guid unique; + uint64_t starting_lba; + uint64_t ending_lba; + union { + struct { + uint16_t reserved[3]; + uint16_t gpt_att; + } __attribute__((packed)) fields; + uint64_t whole; + } attrs; + uint16_t name[36]; /* UTF-16 encoded partition name */ + /* Remainder of entry is reserved and should be 0 */ +} __attribute__((packed)) GptEntry; + +#define GPTENTRY_EXPECTED_SIZE 128 + +#endif /* VBOOT_REFERENCE_CGPTLIB_GPT_H_ */ |