xref: /illumos-gate/usr/src/uts/common/sys/efi_partition.h (revision 62ce8e2e52946c2ebc855b02452650365c19eafc)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright 2012 Nexenta Systems, Inc.  All rights reserved.
24  * Copyright 2014 Toomas Soome <tsoome@me.com>
25  * Copyright (c) 2019, Joyent, Inc.
26  */
27 
28 #ifndef	_SYS_EFI_PARTITION_H
29 #define	_SYS_EFI_PARTITION_H
30 
31 #include <sys/uuid.h>
32 #include <sys/stddef.h>
33 
34 #ifdef	__cplusplus
35 extern "C" {
36 #endif
37 
38 /*
39  * GUID Partition Table Header
40  */
41 
42 #define	EFI_LABEL_SIZE	512
43 #define	LEN_EFI_PAD	(EFI_LABEL_SIZE - \
44 			    ((5 * sizeof (diskaddr_t)) + \
45 			    (7 * sizeof (uint_t)) + \
46 			    (8 * sizeof (char)) + \
47 			    (1 * (sizeof (struct uuid)))))
48 
49 #define	EFI_SIGNATURE	0x5452415020494645ULL
50 
51 /*
52  * Although the EFI spec is clear that sizeof (efi_gpt_t) is a valid value
53  * (512), at least one EFI system (AMI v4.6.4.1) incorrectly expects this to be
54  * exactly the size of the structure defined in the spec, that is, 92.
55  *
56  * As the reserved section is never used, the modified value works fine
57  * everywhere else.
58  */
59 #define	EFI_HEADER_SIZE (offsetof(efi_gpt_t, efi_gpt_Reserved2))
60 
61 /* EFI Guid Partition Table Header -- little endian on-disk format */
62 typedef struct efi_gpt {
63 	uint64_t	efi_gpt_Signature;
64 	uint_t		efi_gpt_Revision;
65 	uint_t		efi_gpt_HeaderSize;
66 	uint_t		efi_gpt_HeaderCRC32;
67 	uint_t		efi_gpt_Reserved1;
68 	diskaddr_t	efi_gpt_MyLBA;
69 	diskaddr_t	efi_gpt_AlternateLBA;
70 	diskaddr_t	efi_gpt_FirstUsableLBA;
71 	diskaddr_t	efi_gpt_LastUsableLBA;
72 	struct uuid	efi_gpt_DiskGUID;
73 	diskaddr_t	efi_gpt_PartitionEntryLBA;
74 	uint_t		efi_gpt_NumberOfPartitionEntries;
75 	uint_t		efi_gpt_SizeOfPartitionEntry;
76 	uint_t		efi_gpt_PartitionEntryArrayCRC32;
77 	char		efi_gpt_Reserved2[LEN_EFI_PAD];
78 } efi_gpt_t;
79 
80 /* EFI Guid Partition Entry Attributes -- little endian format */
81 typedef struct efi_gpe_Attrs {
82 	uint32_t	PartitionAttrs		:16,
83 			Reserved2		:16;
84 	uint32_t	Reserved1		:31,
85 			RequiredPartition	:1;
86 } efi_gpe_Attrs_t;
87 
88 /*
89  * 6a96237f-1dd2-11b2-99a6-080020736631	V_UNASSIGNED (not used as such)
90  * 6a82cb45-1dd2-11b2-99a6-080020736631	V_BOOT
91  * 6a85cf4d-1dd2-11b2-99a6-080020736631	V_ROOT
92  * 6a87c46f-1dd2-11b2-99a6-080020736631	V_SWAP
93  * 6a898cc3-1dd2-11b2-99a6-080020736631	V_USR
94  * 6a8b642b-1dd2-11b2-99a6-080020736631	V_BACKUP
95  * 6a8d2ac7-1dd2-11b2-99a6-080020736631	V_STAND (not used)
96  * 6a8ef2e9-1dd2-11b2-99a6-080020736631	V_VAR
97  * 6a90ba39-1dd2-11b2-99a6-080020736631	V_HOME
98  * 6a9283a5-1dd2-11b2-99a6-080020736631	V_ALTSCTR
99  * 6a945a3b-1dd2-11b2-99a6-080020736631	V_CACHE
100  */
101 
102 #define	EFI_UNUSED		{ 0x00000000, 0x0000, 0x0000, 0x00, 0x00, \
103 				    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
104 #define	EFI_RESV1		{ 0x6a96237f, 0x1dd2, 0x11b2, 0x99, 0xa6, \
105 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
106 #define	EFI_BOOT		{ 0x6a82cb45, 0x1dd2, 0x11b2, 0x99, 0xa6, \
107 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
108 #define	EFI_ROOT		{ 0x6a85cf4d, 0x1dd2, 0x11b2, 0x99, 0xa6, \
109 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
110 #define	EFI_SWAP		{ 0x6a87c46f, 0x1dd2, 0x11b2, 0x99, 0xa6, \
111 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
112 #define	EFI_USR			{ 0x6a898cc3, 0x1dd2, 0x11b2, 0x99, 0xa6, \
113 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
114 #define	EFI_BACKUP		{ 0x6a8b642b, 0x1dd2, 0x11b2, 0x99, 0xa6, \
115 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
116 #define	EFI_RESV2		{ 0x6a8d2ac7, 0x1dd2, 0x11b2, 0x99, 0xa6, \
117 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
118 #define	EFI_VAR			{ 0x6a8ef2e9, 0x1dd2, 0x11b2, 0x99, 0xa6, \
119 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
120 #define	EFI_HOME		{ 0x6a90ba39, 0x1dd2, 0x11b2, 0x99, 0xa6, \
121 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
122 #define	EFI_ALTSCTR		{ 0x6a9283a5, 0x1dd2, 0x11b2, 0x99, 0xa6, \
123 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
124 #define	EFI_RESERVED		{ 0x6a945a3b, 0x1dd2, 0x11b2, 0x99, 0xa6, \
125 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
126 #define	EFI_SYSTEM		{ 0xC12A7328, 0xF81F, 0x11d2, 0xBA, 0x4B, \
127 				    { 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B } }
128 #define	EFI_LEGACY_MBR		{ 0x024DEE41, 0x33E7, 0x11d3, 0x9D, 0x69, \
129 				    { 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F } }
130 #define	EFI_SYMC_PUB		{ 0x6a9630d1, 0x1dd2, 0x11b2, 0x99, 0xa6, \
131 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
132 #define	EFI_SYMC_CDS		{ 0x6a980767, 0x1dd2, 0x11b2, 0x99, 0xa6, \
133 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
134 #define	EFI_MSFT_RESV		{ 0xE3C9E316, 0x0B5C, 0x4DB8, 0x81, 0x7D, \
135 				    { 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE } }
136 #define	EFI_DELL_BASIC		{ 0xebd0a0a2, 0xb9e5, 0x4433, 0x87, 0xc0, \
137 				    { 0x68, 0xb6, 0xb7, 0x26, 0x99, 0xc7 } }
138 #define	EFI_DELL_RAID		{ 0xa19d880f, 0x05fc, 0x4d3b, 0xa0, 0x06, \
139 				    { 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e } }
140 #define	EFI_DELL_SWAP		{ 0x0657fd6d, 0xa4ab, 0x43c4, 0x84, 0xe5, \
141 				    { 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f } }
142 #define	EFI_DELL_LVM		{ 0xe6d6d379, 0xf507, 0x44c2, 0xa2, 0x3c, \
143 				    { 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28 } }
144 #define	EFI_DELL_RESV		{ 0x8da63339, 0x0007, 0x60c0, 0xc4, 0x36, \
145 				    { 0x08, 0x3a, 0xc8, 0x23, 0x09, 0x08 } }
146 #define	EFI_AAPL_BOOT		{ 0x426F6F74, 0x0000, 0x11aa, 0xaa, 0x11, \
147 				{ 0x00, 0x30, 0x65, 0x43, 0xec, 0xac } }
148 #define	EFI_AAPL_HFS		{ 0x48465300, 0x0000, 0x11aa, 0xaa, 0x11, \
149 				    { 0x00, 0x30, 0x65, 0x43, 0xec, 0xac } }
150 #define	EFI_AAPL_UFS		{ 0x55465300, 0x0000, 0x11aa, 0xaa, 0x11, \
151 				    { 0x00, 0x30, 0x65, 0x43, 0xec, 0xac } }
152 #define	EFI_AAPL_ZFS		{ 0x6a898cc3, 0x1dd2, 0x11b2, 0x99, 0xa6, \
153 				    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
154 #define	EFI_AAPL_APFS		{ 0x7c3457ef, 0x0000, 0x11aa, 0xaa, 0x11, \
155 				    { 0x00, 0x30, 0x65, 0x43, 0xec, 0xac } }
156 #define	EFI_FREEBSD_BOOT	{ 0x83bd6b9d, 0x7f41, 0x11dc, 0xbe, 0x0b, \
157 				    { 0x00, 0x15, 0x60, 0xb8, 0x4f, 0x0f } }
158 #define	EFI_FREEBSD_NANDFS	{ 0x74ba7dd9, 0xa689, 0x11e1, 0xbd, 0x04, \
159 				    { 0x00, 0xe0, 0x81, 0x28, 0x6a, 0xcf } }
160 #define	EFI_FREEBSD_SWAP	{ 0x516e7cb5, 0x6ecf, 0x11d6, 0x8f, 0xf8, \
161 				    { 0x00, 0x02, 0x2d, 0x09, 0x71, 0x2b } }
162 #define	EFI_FREEBSD_UFS		{ 0x516e7cb6, 0x6ecf, 0x11d6, 0x8f, 0xf8, \
163 				    { 0x00, 0x02, 0x2d, 0x09, 0x71, 0x2b } }
164 #define	EFI_FREEBSD_VINUM	{ 0x516e7cb8, 0x6ecf, 0x11d6, 0x8f, 0xf8, \
165 				    { 0x00, 0x02, 0x2d, 0x09, 0x71, 0x2b } }
166 #define	EFI_FREEBSD_ZFS		{ 0x516e7cba, 0x6ecf, 0x11d6, 0x8f, 0xf8, \
167 				    { 0x00, 0x02, 0x2d, 0x09, 0x71, 0x2b } }
168 #define	EFI_BIOS_BOOT		{ 0x21686148, 0x6449, 0x6e6f, 0x74, 0x4e, \
169 				    { 0x65, 0x65, 0x64, 0x45, 0x46, 0x49 } }
170 
171 /* minimum # of bytes for partition table entires, per EFI spec */
172 #define	EFI_MIN_ARRAY_SIZE	(16 * 1024)
173 
174 #define	EFI_PART_NAME_LEN	36
175 
176 /* size of the "reserved" partition, in blocks */
177 #define	EFI_MIN_RESV_SIZE	(16 * 1024)
178 
179 /* EFI Guid Partition Entry */
180 typedef struct efi_gpe {
181 	struct uuid	efi_gpe_PartitionTypeGUID;
182 	struct uuid	efi_gpe_UniquePartitionGUID;
183 	diskaddr_t	efi_gpe_StartingLBA;
184 	diskaddr_t	efi_gpe_EndingLBA;
185 	efi_gpe_Attrs_t	efi_gpe_Attributes;
186 	ushort_t	efi_gpe_PartitionName[EFI_PART_NAME_LEN];
187 } efi_gpe_t;
188 
189 /*
190  * passed to the useful (we hope) routines (efi_alloc_and_read and
191  * efi_write) that take this VTOC-like struct.  These routines handle
192  * converting this struct into the EFI struct, generate UUIDs and
193  * checksums, and perform any necessary byte-swapping to the on-disk
194  * format.
195  */
196 /* Solaris library abstraction for EFI partitons */
197 typedef struct dk_part	{
198 	diskaddr_t	p_start;	/* starting LBA */
199 	diskaddr_t	p_size;		/* size in blocks */
200 	struct uuid	p_guid;		/* partion type GUID */
201 	ushort_t	p_tag;		/* converted to part'n type GUID */
202 	ushort_t	p_flag;		/* attributes */
203 	char		p_name[EFI_PART_NAME_LEN]; /* partition name */
204 	struct uuid	p_uguid;	/* unique partition GUID */
205 	uint_t		p_resv[8];	/* future use - set to zero */
206 } dk_part_t;
207 
208 /* Solaris library abstraction for an EFI GPT */
209 #define	EFI_VERSION102		0x00010002
210 #define	EFI_VERSION100		0x00010000
211 #define	EFI_VERSION_CURRENT	EFI_VERSION100
212 typedef struct dk_gpt {
213 	uint_t		efi_version;	/* set to EFI_VERSION_CURRENT */
214 	uint_t		efi_nparts;	/* number of partitions below */
215 	uint_t		efi_part_size;	/* size of each partition entry */
216 					/* efi_part_size is unused */
217 	uint_t		efi_lbasize;	/* size of block in bytes */
218 	diskaddr_t	efi_last_lba;	/* last block on the disk */
219 	diskaddr_t	efi_first_u_lba; /* first block after labels */
220 	diskaddr_t	efi_last_u_lba;	/* last block before backup labels */
221 	struct uuid	efi_disk_uguid;	/* unique disk GUID */
222 	uint_t		efi_flags;
223 	uint_t		efi_reserved1;	/* future use - set to zero */
224 	diskaddr_t	efi_altern_lba;	/* lba of alternate GPT header */
225 	uint_t		efi_reserved[12]; /* future use - set to zero */
226 	struct dk_part	efi_parts[1];	/* array of partitions */
227 } dk_gpt_t;
228 
229 /* possible values for "efi_flags" */
230 #define	EFI_GPT_PRIMARY_CORRUPT	0x1	/* primary label corrupt */
231 
232 /* the private ioctl between libefi and the driver */
233 typedef struct dk_efi {
234 	diskaddr_t	 dki_lba;	/* starting block */
235 	len_t		 dki_length;	/* length in bytes */
236 	union {
237 		efi_gpt_t	*_dki_data;
238 		uint64_t	_dki_data_64;
239 	} dki_un;
240 #define	dki_data	dki_un._dki_data
241 #define	dki_data_64	dki_un._dki_data_64
242 } dk_efi_t;
243 
244 struct partition64 {
245 	struct uuid	p_type;
246 	uint_t		p_partno;
247 	uint_t		p_resv1;
248 	diskaddr_t	p_start;
249 	diskaddr_t	p_size;
250 };
251 
252 /*
253  * Number of EFI partitions
254  */
255 #define	EFI_NUMPAR	9
256 
257 #ifndef _KERNEL
258 extern	uint_t	efi_reserved_sectors(struct dk_gpt *);
259 extern	int	efi_alloc_and_init(int, uint32_t, struct dk_gpt **);
260 extern	int	efi_alloc_and_read(int, struct dk_gpt **);
261 extern	int	efi_write(int, struct dk_gpt *);
262 extern	void	efi_free(struct dk_gpt *);
263 extern	int	efi_type(int);
264 extern	void	efi_err_check(struct dk_gpt *);
265 extern	int	efi_auto_sense(int fd, struct dk_gpt **);
266 extern	int	efi_use_whole_disk(int fd);
267 #endif
268 
269 #ifdef __cplusplus
270 }
271 #endif
272 
273 #endif /* _SYS_EFI_PARTITION_H */
274