2 * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/param.h>
31 #error gpt.c works only for little endian architectures
39 static struct gpt_hdr hdr_primary, hdr_backup, *gpthdr;
40 static uint64_t hdr_primary_lba, hdr_backup_lba;
41 static struct gpt_ent table_primary[MAXTBLENTS], table_backup[MAXTBLENTS];
42 static struct gpt_ent *gpttable;
43 static int curent, bootonce;
46 * Buffer below 64kB passed on gptread(), which can hold at least
47 * one sector of data (512 bytes).
52 gptupdate(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
53 struct gpt_ent *table)
55 int entries_per_sec, firstent;
59 * We need to update the following for both primary and backup GPT:
60 * 1. Sector on disk that contains current partition.
61 * 2. Partition table checksum.
66 entries_per_sec = DEV_BSIZE / hdr->hdr_entsz;
67 slba = curent / entries_per_sec;
68 firstent = slba * entries_per_sec;
69 bcopy(&table[firstent], secbuf, DEV_BSIZE);
70 slba += hdr->hdr_lba_table;
71 if (drvwrite(dskp, secbuf, slba, 1)) {
72 printf("%s: unable to update %s GPT partition table\n",
76 hdr->hdr_crc_table = crc32(0, Z_NULL, 0);
77 hdr->hdr_crc_table = crc32(hdr->hdr_crc_table, (const Bytef *)table,
78 hdr->hdr_entries * hdr->hdr_entsz);
79 hdr->hdr_crc_self = crc32(0, Z_NULL, 0);
80 hdr->hdr_crc_self = crc32(hdr->hdr_crc_self, (const Bytef *)hdr,
82 bzero(secbuf, DEV_BSIZE);
83 bcopy(hdr, secbuf, hdr->hdr_size);
84 if (drvwrite(dskp, secbuf, hdr->hdr_lba_self, 1)) {
85 printf("%s: unable to update %s GPT header\n", BOOTPROG, which);
91 gptfind(const uuid_t *uuid, struct dsk *dskp, int part)
97 if (part == 0 || part > gpthdr->hdr_entries) {
98 printf("%s: invalid partition index\n", BOOTPROG);
101 ent = &gpttable[part - 1];
102 if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0) {
103 printf("%s: specified partition is not UFS\n",
111 firsttry = (curent == -1);
113 if (curent >= gpthdr->hdr_entries) {
114 curent = gpthdr->hdr_entries;
119 * First look for partition with both GPT_ENT_ATTR_BOOTME and
120 * GPT_ENT_ATTR_BOOTONCE flags.
122 for (; curent < gpthdr->hdr_entries; curent++) {
123 ent = &gpttable[curent];
124 if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0)
126 if (!(ent->ent_attr & GPT_ENT_ATTR_BOOTME))
128 if (!(ent->ent_attr & GPT_ENT_ATTR_BOOTONCE))
136 for (; curent < gpthdr->hdr_entries; curent++) {
137 ent = &gpttable[curent];
138 if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0)
140 if (!(ent->ent_attr & GPT_ENT_ATTR_BOOTME))
142 if (ent->ent_attr & GPT_ENT_ATTR_BOOTONCE)
149 * No partition with BOOTME flag was found, try to boot from
150 * first UFS partition.
152 for (curent = 0; curent < gpthdr->hdr_entries; curent++) {
153 ent = &gpttable[curent];
154 if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0)
162 dskp->part = curent + 1;
163 ent = &gpttable[curent];
164 dskp->start = ent->ent_lba_start;
165 if (ent->ent_attr & GPT_ENT_ATTR_BOOTONCE) {
167 * Clear BOOTME, but leave BOOTONCE set before trying to
168 * boot from this partition.
170 if (hdr_primary_lba > 0) {
171 table_primary[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTME;
172 gptupdate("primary", dskp, &hdr_primary, table_primary);
174 if (hdr_backup_lba > 0) {
175 table_backup[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTME;
176 gptupdate("backup", dskp, &hdr_backup, table_backup);
183 gptread_hdr(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
188 if (drvread(dskp, secbuf, hdrlba, 1)) {
189 printf("%s: unable to read %s GPT header\n", BOOTPROG, which);
192 bcopy(secbuf, hdr, sizeof(*hdr));
193 if (bcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0 ||
194 hdr->hdr_lba_self != hdrlba || hdr->hdr_revision < 0x00010000 ||
195 hdr->hdr_entsz < sizeof(struct gpt_ent) ||
196 hdr->hdr_entries > MAXTBLENTS || DEV_BSIZE % hdr->hdr_entsz != 0) {
197 printf("%s: invalid %s GPT header\n", BOOTPROG, which);
200 crc = hdr->hdr_crc_self;
201 hdr->hdr_crc_self = crc32(0, Z_NULL, 0);
202 if (crc32(hdr->hdr_crc_self, (const Bytef *)hdr, hdr->hdr_size) !=
204 printf("%s: %s GPT header checksum mismatch\n", BOOTPROG,
208 hdr->hdr_crc_self = crc;
213 gptbootfailed(struct dsk *dskp)
216 if (!(gpttable[curent].ent_attr & GPT_ENT_ATTR_BOOTONCE))
219 if (hdr_primary_lba > 0) {
220 table_primary[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
221 table_primary[curent].ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
222 gptupdate("primary", dskp, &hdr_primary, table_primary);
224 if (hdr_backup_lba > 0) {
225 table_backup[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
226 table_backup[curent].ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
227 gptupdate("backup", dskp, &hdr_backup, table_backup);
232 gptbootconv(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
233 struct gpt_ent *table)
237 int table_updated, sector_updated;
238 int entries_per_sec, nent, part;
241 entries_per_sec = DEV_BSIZE / hdr->hdr_entsz;
242 for (nent = 0, slba = hdr->hdr_lba_table;
243 slba < hdr->hdr_lba_table + hdr->hdr_entries / entries_per_sec;
244 slba++, nent += entries_per_sec) {
246 for (part = 0; part < entries_per_sec; part++) {
247 ent = &table[nent + part];
248 if ((ent->ent_attr & (GPT_ENT_ATTR_BOOTME |
249 GPT_ENT_ATTR_BOOTONCE |
250 GPT_ENT_ATTR_BOOTFAILED)) !=
251 GPT_ENT_ATTR_BOOTONCE) {
254 ent->ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
255 ent->ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
261 bcopy(&table[nent], secbuf, DEV_BSIZE);
262 if (drvwrite(dskp, secbuf, slba, 1)) {
263 printf("%s: unable to update %s GPT partition table\n",
269 hdr->hdr_crc_table = crc32(0, Z_NULL, 0);
270 hdr->hdr_crc_table = crc32(hdr->hdr_crc_table, (const Bytef *)table,
271 hdr->hdr_entries * hdr->hdr_entsz);
272 hdr->hdr_crc_self = crc32(0, Z_NULL, 0);
273 hdr->hdr_crc_self = crc32(hdr->hdr_crc_self, (const Bytef *)hdr,
275 bzero(secbuf, DEV_BSIZE);
276 bcopy(hdr, secbuf, hdr->hdr_size);
277 if (drvwrite(dskp, secbuf, hdr->hdr_lba_self, 1))
278 printf("%s: unable to update %s GPT header\n", BOOTPROG, which);
282 gptread_table(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
283 struct gpt_ent *table)
290 if (hdr->hdr_entries == 0)
293 entries_per_sec = DEV_BSIZE / hdr->hdr_entsz;
294 slba = hdr->hdr_lba_table;
297 if (drvread(dskp, secbuf, slba, 1)) {
298 printf("%s: unable to read %s GPT partition table\n",
302 ent = (struct gpt_ent *)secbuf;
303 for (part = 0; part < entries_per_sec; part++, ent++) {
304 bcopy(ent, &table[nent], sizeof(table[nent]));
305 if (++nent >= hdr->hdr_entries)
308 if (nent >= hdr->hdr_entries)
312 if (crc32(0, (const Bytef *)table, nent * hdr->hdr_entsz) !=
313 hdr->hdr_crc_table) {
314 printf("%s: %s GPT table checksum mismatch\n", BOOTPROG, which);
321 gptread(struct dsk *dskp, char *buf)
326 * Read and verify both GPT headers: primary and backup.
330 hdr_primary_lba = hdr_backup_lba = 0;
335 if (gptread_hdr("primary", dskp, &hdr_primary, 1) == 0 &&
336 gptread_table("primary", dskp, &hdr_primary, table_primary) == 0) {
337 hdr_primary_lba = hdr_primary.hdr_lba_self;
338 gpthdr = &hdr_primary;
339 gpttable = table_primary;
342 if (hdr_primary_lba > 0) {
344 * If primary header is valid, we can get backup
345 * header location from there.
347 altlba = hdr_primary.hdr_lba_alt;
349 altlba = drvsize(dskp);
354 printf("%s: unable to locate backup GPT header\n", BOOTPROG);
355 else if (gptread_hdr("backup", dskp, &hdr_backup, altlba) == 0 &&
356 gptread_table("backup", dskp, &hdr_backup, table_backup) == 0) {
357 hdr_backup_lba = hdr_backup.hdr_lba_self;
358 if (hdr_primary_lba == 0) {
359 gpthdr = &hdr_backup;
360 gpttable = table_backup;
361 printf("%s: using backup GPT\n", BOOTPROG);
366 * Convert all BOOTONCE without BOOTME flags into BOOTFAILED.
367 * BOOTONCE without BOOTME means that we tried to boot from it,
368 * but failed after leaving gptboot and machine was rebooted.
369 * We don't want to leave partitions marked as BOOTONCE only,
370 * because when we boot successfully start-up scripts should
371 * find at most one partition with only BOOTONCE flag and this
372 * will mean that we booted from that partition.
374 if (hdr_primary_lba != 0)
375 gptbootconv("primary", dskp, &hdr_primary, table_primary);
376 if (hdr_backup_lba != 0)
377 gptbootconv("backup", dskp, &hdr_backup, table_backup);
379 if (hdr_primary_lba == 0 && hdr_backup_lba == 0)