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2e3d0692 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <unistd.h> | |
7b4d7cc0 | 23 | #include <string.h> |
2e3d0692 LP |
24 | #include <fcntl.h> |
25 | ||
26 | #include "util.h" | |
27 | #include "utf8.h" | |
5bdf2243 | 28 | #include "virt.h" |
2e3d0692 LP |
29 | #include "efivars.h" |
30 | ||
b872e9a0 LP |
31 | #ifdef ENABLE_EFI |
32 | ||
0974a682 KS |
33 | #define LOAD_OPTION_ACTIVE 0x00000001 |
34 | #define MEDIA_DEVICE_PATH 0x04 | |
35 | #define MEDIA_HARDDRIVE_DP 0x01 | |
36 | #define MEDIA_FILEPATH_DP 0x04 | |
37 | #define SIGNATURE_TYPE_GUID 0x02 | |
38 | #define MBR_TYPE_EFI_PARTITION_TABLE_HEADER 0x02 | |
39 | #define END_DEVICE_PATH_TYPE 0x7f | |
40 | #define END_ENTIRE_DEVICE_PATH_SUBTYPE 0xff | |
5bdf2243 | 41 | #define EFI_OS_INDICATIONS_BOOT_TO_FW_UI 0x0000000000000001 |
0974a682 KS |
42 | |
43 | struct boot_option { | |
44 | uint32_t attr; | |
45 | uint16_t path_len; | |
46 | uint16_t title[]; | |
885fdebc | 47 | } _packed_; |
0974a682 KS |
48 | |
49 | struct drive_path { | |
50 | uint32_t part_nr; | |
51 | uint64_t part_start; | |
52 | uint64_t part_size; | |
53 | char signature[16]; | |
54 | uint8_t mbr_type; | |
55 | uint8_t signature_type; | |
885fdebc | 56 | } _packed_; |
0974a682 KS |
57 | |
58 | struct device_path { | |
59 | uint8_t type; | |
60 | uint8_t sub_type; | |
61 | uint16_t length; | |
62 | union { | |
63 | uint16_t path[0]; | |
64 | struct drive_path drive; | |
65 | }; | |
885fdebc | 66 | } _packed_; |
0974a682 | 67 | |
9cde64ff | 68 | bool is_efi_boot(void) { |
34e5a31e LP |
69 | return access("/sys/firmware/efi", F_OK) >= 0; |
70 | } | |
71 | ||
bc6f2e7c KS |
72 | static int read_flag(const char *varname) { |
73 | int r; | |
b47d419c | 74 | _cleanup_free_ void *v = NULL; |
bc6f2e7c KS |
75 | size_t s; |
76 | uint8_t b; | |
77 | ||
78 | r = efi_get_variable(EFI_VENDOR_GLOBAL, varname, NULL, &v, &s); | |
79 | if (r < 0) | |
80 | return r; | |
81 | ||
b47d419c ZJS |
82 | if (s != 1) |
83 | return -EINVAL; | |
bc6f2e7c KS |
84 | |
85 | b = *(uint8_t *)v; | |
86 | r = b > 0; | |
bc6f2e7c KS |
87 | return r; |
88 | } | |
89 | ||
9df49b33 TG |
90 | bool is_efi_secure_boot(void) { |
91 | return read_flag("SecureBoot") > 0; | |
bc6f2e7c KS |
92 | } |
93 | ||
9df49b33 TG |
94 | bool is_efi_secure_boot_setup_mode(void) { |
95 | return read_flag("SetupMode") > 0; | |
bc6f2e7c KS |
96 | } |
97 | ||
5bdf2243 JJ |
98 | int efi_reboot_to_firmware_supported(void) { |
99 | int r; | |
100 | size_t s; | |
101 | uint64_t b; | |
102 | _cleanup_free_ void *v = NULL; | |
103 | ||
75f86906 | 104 | if (!is_efi_boot() || detect_container() > 0) |
5bdf2243 JJ |
105 | return -EOPNOTSUPP; |
106 | ||
107 | r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s); | |
108 | if (r < 0) | |
109 | return r; | |
110 | else if (s != sizeof(uint64_t)) | |
111 | return -EINVAL; | |
112 | ||
113 | b = *(uint64_t *)v; | |
114 | b &= EFI_OS_INDICATIONS_BOOT_TO_FW_UI; | |
115 | return b > 0 ? 0 : -EOPNOTSUPP; | |
116 | } | |
117 | ||
118 | static int get_os_indications(uint64_t *os_indication) { | |
119 | int r; | |
120 | size_t s; | |
121 | _cleanup_free_ void *v = NULL; | |
122 | ||
123 | r = efi_reboot_to_firmware_supported(); | |
124 | if (r < 0) | |
125 | return r; | |
126 | ||
127 | r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndications", NULL, &v, &s); | |
6b62bbbc LP |
128 | if (r == -ENOENT) { |
129 | /* Some firmware implementations that do support | |
130 | * OsIndications and report that with | |
131 | * OsIndicationsSupported will remove the | |
132 | * OsIndications variable when it is unset. Let's | |
133 | * pretend it's 0 then, to hide this implementation | |
134 | * detail. Note that this call will return -ENOENT | |
135 | * then only if the support for OsIndications is | |
136 | * missing entirely, as determined by | |
137 | * efi_reboot_to_firmware_supported() above. */ | |
138 | *os_indication = 0; | |
139 | return 0; | |
140 | } else if (r < 0) | |
5bdf2243 JJ |
141 | return r; |
142 | else if (s != sizeof(uint64_t)) | |
143 | return -EINVAL; | |
144 | ||
145 | *os_indication = *(uint64_t *)v; | |
146 | return 0; | |
147 | } | |
148 | ||
149 | int efi_get_reboot_to_firmware(void) { | |
150 | int r; | |
151 | uint64_t b; | |
152 | ||
153 | r = get_os_indications(&b); | |
154 | if (r < 0) | |
155 | return r; | |
156 | ||
157 | return !!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI); | |
158 | } | |
159 | ||
160 | int efi_set_reboot_to_firmware(bool value) { | |
161 | int r; | |
162 | uint64_t b, b_new; | |
163 | ||
164 | r = get_os_indications(&b); | |
165 | if (r < 0) | |
166 | return r; | |
167 | ||
168 | if (value) | |
169 | b_new = b | EFI_OS_INDICATIONS_BOOT_TO_FW_UI; | |
170 | else | |
171 | b_new = b & ~EFI_OS_INDICATIONS_BOOT_TO_FW_UI; | |
172 | ||
173 | /* Avoid writing to efi vars store if we can due to firmware bugs. */ | |
174 | if (b != b_new) | |
175 | return efi_set_variable(EFI_VENDOR_GLOBAL, "OsIndications", &b_new, sizeof(uint64_t)); | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
9cde64ff LP |
180 | int efi_get_variable( |
181 | sd_id128_t vendor, | |
182 | const char *name, | |
183 | uint32_t *attribute, | |
184 | void **value, | |
185 | size_t *size) { | |
186 | ||
2e3d0692 LP |
187 | _cleanup_close_ int fd = -1; |
188 | _cleanup_free_ char *p = NULL; | |
189 | uint32_t a; | |
190 | ssize_t n; | |
191 | struct stat st; | |
ad7bcf52 | 192 | _cleanup_free_ void *buf = NULL; |
2e3d0692 LP |
193 | |
194 | assert(name); | |
195 | assert(value); | |
196 | assert(size); | |
197 | ||
198 | if (asprintf(&p, | |
199 | "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
200 | name, SD_ID128_FORMAT_VAL(vendor)) < 0) | |
201 | return -ENOMEM; | |
202 | ||
203 | fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
204 | if (fd < 0) | |
205 | return -errno; | |
206 | ||
207 | if (fstat(fd, &st) < 0) | |
208 | return -errno; | |
209 | if (st.st_size < 4) | |
210 | return -EIO; | |
211 | if (st.st_size > 4*1024*1024 + 4) | |
212 | return -E2BIG; | |
213 | ||
214 | n = read(fd, &a, sizeof(a)); | |
215 | if (n < 0) | |
9cde64ff | 216 | return -errno; |
2e3d0692 LP |
217 | if (n != sizeof(a)) |
218 | return -EIO; | |
219 | ||
0797f232 ZJS |
220 | buf = malloc(st.st_size - 4 + 2); |
221 | if (!buf) | |
2e3d0692 LP |
222 | return -ENOMEM; |
223 | ||
0797f232 ZJS |
224 | n = read(fd, buf, (size_t) st.st_size - 4); |
225 | if (n < 0) | |
742af54a | 226 | return -errno; |
0797f232 | 227 | if (n != (ssize_t) st.st_size - 4) |
2e3d0692 | 228 | return -EIO; |
2e3d0692 LP |
229 | |
230 | /* Always NUL terminate (2 bytes, to protect UTF-16) */ | |
0797f232 ZJS |
231 | ((char*) buf)[st.st_size - 4] = 0; |
232 | ((char*) buf)[st.st_size - 4 + 1] = 0; | |
2e3d0692 | 233 | |
0797f232 ZJS |
234 | *value = buf; |
235 | buf = NULL; | |
ff47c895 | 236 | *size = (size_t) st.st_size - 4; |
2e3d0692 LP |
237 | |
238 | if (attribute) | |
239 | *attribute = a; | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
0974a682 KS |
244 | int efi_set_variable( |
245 | sd_id128_t vendor, | |
246 | const char *name, | |
247 | const void *value, | |
248 | size_t size) { | |
249 | ||
250 | struct var { | |
251 | uint32_t attr; | |
252 | char buf[]; | |
b7749eb5 ZJS |
253 | } _packed_ * _cleanup_free_ buf = NULL; |
254 | _cleanup_free_ char *p = NULL; | |
255 | _cleanup_close_ int fd = -1; | |
0974a682 KS |
256 | |
257 | assert(name); | |
258 | ||
259 | if (asprintf(&p, | |
260 | "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
261 | name, SD_ID128_FORMAT_VAL(vendor)) < 0) | |
262 | return -ENOMEM; | |
263 | ||
264 | if (size == 0) { | |
b7749eb5 ZJS |
265 | if (unlink(p) < 0) |
266 | return -errno; | |
267 | return 0; | |
0974a682 KS |
268 | } |
269 | ||
270 | fd = open(p, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, 0644); | |
b7749eb5 ZJS |
271 | if (fd < 0) |
272 | return -errno; | |
0974a682 KS |
273 | |
274 | buf = malloc(sizeof(uint32_t) + size); | |
b7749eb5 ZJS |
275 | if (!buf) |
276 | return -ENOMEM; | |
0974a682 KS |
277 | |
278 | buf->attr = EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS; | |
279 | memcpy(buf->buf, value, size); | |
280 | ||
b7749eb5 | 281 | return loop_write(fd, buf, sizeof(uint32_t) + size, false); |
0974a682 KS |
282 | } |
283 | ||
9cde64ff | 284 | int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) { |
7b4d7cc0 | 285 | _cleanup_free_ void *s = NULL; |
39883f62 | 286 | size_t ss = 0; |
9cde64ff LP |
287 | int r; |
288 | char *x; | |
7b4d7cc0 | 289 | |
9cde64ff LP |
290 | r = efi_get_variable(vendor, name, NULL, &s, &ss); |
291 | if (r < 0) | |
292 | return r; | |
293 | ||
294 | x = utf16_to_utf8(s, ss); | |
295 | if (!x) | |
296 | return -ENOMEM; | |
297 | ||
298 | *p = x; | |
299 | return 0; | |
7b4d7cc0 KS |
300 | } |
301 | ||
302 | static size_t utf16_size(const uint16_t *s) { | |
303 | size_t l = 0; | |
304 | ||
305 | while (s[l] > 0) | |
306 | l++; | |
9cde64ff | 307 | |
7b4d7cc0 KS |
308 | return (l+1) * sizeof(uint16_t); |
309 | } | |
310 | ||
311 | static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) { | |
312 | struct uuid { | |
313 | uint32_t u1; | |
314 | uint16_t u2; | |
315 | uint16_t u3; | |
316 | uint8_t u4[8]; | |
317 | } _packed_; | |
318 | const struct uuid *uuid = guid; | |
319 | ||
320 | id128->bytes[0] = (uuid->u1 >> 24) & 0xff; | |
321 | id128->bytes[1] = (uuid->u1 >> 16) & 0xff; | |
322 | id128->bytes[2] = (uuid->u1 >> 8) & 0xff; | |
323 | id128->bytes[3] = (uuid->u1) & 0xff; | |
324 | id128->bytes[4] = (uuid->u2 >> 8) & 0xff; | |
325 | id128->bytes[5] = (uuid->u2) & 0xff; | |
326 | id128->bytes[6] = (uuid->u3 >> 8) & 0xff; | |
327 | id128->bytes[7] = (uuid->u3) & 0xff; | |
328 | memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4)); | |
329 | } | |
330 | ||
9cde64ff LP |
331 | int efi_get_boot_option( |
332 | uint16_t id, | |
333 | char **title, | |
334 | sd_id128_t *part_uuid, | |
0974a682 KS |
335 | char **path, |
336 | bool *active) { | |
7b4d7cc0 | 337 | |
9cde64ff LP |
338 | char boot_id[9]; |
339 | _cleanup_free_ uint8_t *buf = NULL; | |
7b4d7cc0 KS |
340 | size_t l; |
341 | struct boot_option *header; | |
342 | size_t title_size; | |
b7749eb5 | 343 | _cleanup_free_ char *s = NULL, *p = NULL; |
7b4d7cc0 | 344 | sd_id128_t p_uuid = SD_ID128_NULL; |
a8436474 | 345 | int r; |
7b4d7cc0 | 346 | |
b7749eb5 | 347 | xsprintf(boot_id, "Boot%04X", id); |
a8436474 ZJS |
348 | r = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l); |
349 | if (r < 0) | |
350 | return r; | |
7b4d7cc0 KS |
351 | if (l < sizeof(struct boot_option)) |
352 | return -ENOENT; | |
353 | ||
354 | header = (struct boot_option *)buf; | |
355 | title_size = utf16_size(header->title); | |
356 | if (title_size > l - offsetof(struct boot_option, title)) | |
357 | return -EINVAL; | |
358 | ||
5483a186 ZJS |
359 | if (title) { |
360 | s = utf16_to_utf8(header->title, title_size); | |
b7749eb5 ZJS |
361 | if (!s) |
362 | return -ENOMEM; | |
7b4d7cc0 KS |
363 | } |
364 | ||
365 | if (header->path_len > 0) { | |
9cde64ff | 366 | uint8_t *dbuf; |
7b4d7cc0 KS |
367 | size_t dnext; |
368 | ||
369 | dbuf = buf + offsetof(struct boot_option, title) + title_size; | |
370 | dnext = 0; | |
371 | while (dnext < header->path_len) { | |
372 | struct device_path *dpath; | |
373 | ||
374 | dpath = (struct device_path *)(dbuf + dnext); | |
375 | if (dpath->length < 4) | |
376 | break; | |
377 | ||
378 | /* Type 0x7F – End of Hardware Device Path, Sub-Type 0xFF – End Entire Device Path */ | |
0974a682 | 379 | if (dpath->type == END_DEVICE_PATH_TYPE && dpath->sub_type == END_ENTIRE_DEVICE_PATH_SUBTYPE) |
7b4d7cc0 KS |
380 | break; |
381 | ||
382 | dnext += dpath->length; | |
383 | ||
384 | /* Type 0x04 – Media Device Path */ | |
0974a682 | 385 | if (dpath->type != MEDIA_DEVICE_PATH) |
7b4d7cc0 KS |
386 | continue; |
387 | ||
388 | /* Sub-Type 1 – Hard Drive */ | |
0974a682 | 389 | if (dpath->sub_type == MEDIA_HARDDRIVE_DP) { |
7b4d7cc0 | 390 | /* 0x02 – GUID Partition Table */ |
0974a682 | 391 | if (dpath->drive.mbr_type != MBR_TYPE_EFI_PARTITION_TABLE_HEADER) |
7b4d7cc0 KS |
392 | continue; |
393 | ||
394 | /* 0x02 – GUID signature */ | |
0974a682 | 395 | if (dpath->drive.signature_type != SIGNATURE_TYPE_GUID) |
7b4d7cc0 KS |
396 | continue; |
397 | ||
5483a186 ZJS |
398 | if (part_uuid) |
399 | efi_guid_to_id128(dpath->drive.signature, &p_uuid); | |
7b4d7cc0 KS |
400 | continue; |
401 | } | |
402 | ||
403 | /* Sub-Type 4 – File Path */ | |
0974a682 | 404 | if (dpath->sub_type == MEDIA_FILEPATH_DP && !p && path) { |
7b4d7cc0 | 405 | p = utf16_to_utf8(dpath->path, dpath->length-4); |
0974a682 | 406 | efi_tilt_backslashes(p); |
7b4d7cc0 KS |
407 | continue; |
408 | } | |
409 | } | |
410 | } | |
411 | ||
b7749eb5 | 412 | if (title) { |
9cde64ff | 413 | *title = s; |
b7749eb5 ZJS |
414 | s = NULL; |
415 | } | |
7b4d7cc0 KS |
416 | if (part_uuid) |
417 | *part_uuid = p_uuid; | |
b7749eb5 | 418 | if (path) { |
7b4d7cc0 | 419 | *path = p; |
b7749eb5 ZJS |
420 | p = NULL; |
421 | } | |
0974a682 | 422 | if (active) |
0aa3b783 | 423 | *active = !!(header->attr & LOAD_OPTION_ACTIVE); |
9cde64ff | 424 | |
7b4d7cc0 | 425 | return 0; |
7b4d7cc0 KS |
426 | } |
427 | ||
0974a682 KS |
428 | static void to_utf16(uint16_t *dest, const char *src) { |
429 | int i; | |
430 | ||
431 | for (i = 0; src[i] != '\0'; i++) | |
432 | dest[i] = src[i]; | |
433 | dest[i] = '\0'; | |
434 | } | |
435 | ||
436 | struct guid { | |
437 | uint32_t u1; | |
438 | uint16_t u2; | |
439 | uint16_t u3; | |
440 | uint8_t u4[8]; | |
885fdebc | 441 | } _packed_; |
0974a682 KS |
442 | |
443 | static void id128_to_efi_guid(sd_id128_t id, void *guid) { | |
444 | struct guid *uuid = guid; | |
445 | ||
446 | uuid->u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3]; | |
447 | uuid->u2 = id.bytes[4] << 8 | id.bytes[5]; | |
448 | uuid->u3 = id.bytes[6] << 8 | id.bytes[7]; | |
449 | memcpy(uuid->u4, id.bytes+8, sizeof(uuid->u4)); | |
450 | } | |
451 | ||
452 | static uint16_t *tilt_slashes(uint16_t *s) { | |
453 | uint16_t *p; | |
454 | ||
455 | for (p = s; *p; p++) | |
456 | if (*p == '/') | |
457 | *p = '\\'; | |
458 | ||
459 | return s; | |
460 | } | |
461 | ||
0974a682 KS |
462 | int efi_add_boot_option(uint16_t id, const char *title, |
463 | uint32_t part, uint64_t pstart, uint64_t psize, | |
464 | sd_id128_t part_uuid, const char *path) { | |
465 | char boot_id[9]; | |
0974a682 KS |
466 | size_t size; |
467 | size_t title_len; | |
468 | size_t path_len; | |
469 | struct boot_option *option; | |
470 | struct device_path *devicep; | |
b7749eb5 | 471 | _cleanup_free_ char *buf = NULL; |
0974a682 KS |
472 | |
473 | title_len = (strlen(title)+1) * 2; | |
474 | path_len = (strlen(path)+1) * 2; | |
475 | ||
476 | buf = calloc(sizeof(struct boot_option) + title_len + | |
477 | sizeof(struct drive_path) + | |
478 | sizeof(struct device_path) + path_len, 1); | |
b7749eb5 ZJS |
479 | if (!buf) |
480 | return -ENOMEM; | |
0974a682 KS |
481 | |
482 | /* header */ | |
483 | option = (struct boot_option *)buf; | |
484 | option->attr = LOAD_OPTION_ACTIVE; | |
485 | option->path_len = offsetof(struct device_path, drive) + sizeof(struct drive_path) + | |
486 | offsetof(struct device_path, path) + path_len + | |
487 | offsetof(struct device_path, path); | |
488 | to_utf16(option->title, title); | |
489 | size = offsetof(struct boot_option, title) + title_len; | |
490 | ||
491 | /* partition info */ | |
492 | devicep = (struct device_path *)(buf + size); | |
493 | devicep->type = MEDIA_DEVICE_PATH; | |
494 | devicep->sub_type = MEDIA_HARDDRIVE_DP; | |
495 | devicep->length = offsetof(struct device_path, drive) + sizeof(struct drive_path); | |
496 | devicep->drive.part_nr = part; | |
497 | devicep->drive.part_start = pstart; | |
920b52e4 | 498 | devicep->drive.part_size = psize; |
0974a682 KS |
499 | devicep->drive.signature_type = SIGNATURE_TYPE_GUID; |
500 | devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER; | |
501 | id128_to_efi_guid(part_uuid, devicep->drive.signature); | |
502 | size += devicep->length; | |
503 | ||
504 | /* path to loader */ | |
505 | devicep = (struct device_path *)(buf + size); | |
506 | devicep->type = MEDIA_DEVICE_PATH; | |
507 | devicep->sub_type = MEDIA_FILEPATH_DP; | |
508 | devicep->length = offsetof(struct device_path, path) + path_len; | |
509 | to_utf16(devicep->path, path); | |
510 | tilt_slashes(devicep->path); | |
511 | size += devicep->length; | |
512 | ||
513 | /* end of path */ | |
514 | devicep = (struct device_path *)(buf + size); | |
515 | devicep->type = END_DEVICE_PATH_TYPE; | |
516 | devicep->sub_type = END_ENTIRE_DEVICE_PATH_SUBTYPE; | |
517 | devicep->length = offsetof(struct device_path, path); | |
518 | size += devicep->length; | |
519 | ||
b7749eb5 ZJS |
520 | xsprintf(boot_id, "Boot%04X", id); |
521 | return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size); | |
0974a682 KS |
522 | } |
523 | ||
524 | int efi_remove_boot_option(uint16_t id) { | |
525 | char boot_id[9]; | |
526 | ||
b7749eb5 | 527 | xsprintf(boot_id, "Boot%04X", id); |
0974a682 KS |
528 | return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, 0); |
529 | } | |
530 | ||
9cde64ff | 531 | int efi_get_boot_order(uint16_t **order) { |
0797f232 | 532 | _cleanup_free_ void *buf = NULL; |
7b4d7cc0 | 533 | size_t l; |
9cde64ff | 534 | int r; |
7b4d7cc0 | 535 | |
9cde64ff LP |
536 | r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l); |
537 | if (r < 0) | |
538 | return r; | |
7b4d7cc0 | 539 | |
0797f232 | 540 | if (l <= 0) |
7b4d7cc0 | 541 | return -ENOENT; |
7b4d7cc0 | 542 | |
0797f232 ZJS |
543 | if (l % sizeof(uint16_t) > 0 || |
544 | l / sizeof(uint16_t) > INT_MAX) | |
7b4d7cc0 | 545 | return -EINVAL; |
7b4d7cc0 KS |
546 | |
547 | *order = buf; | |
0797f232 | 548 | buf = NULL; |
9cde64ff LP |
549 | return (int) (l / sizeof(uint16_t)); |
550 | } | |
551 | ||
0974a682 KS |
552 | int efi_set_boot_order(uint16_t *order, size_t n) { |
553 | return efi_set_variable(EFI_VENDOR_GLOBAL, "BootOrder", order, n * sizeof(uint16_t)); | |
554 | } | |
555 | ||
4d34c495 KS |
556 | static int boot_id_hex(const char s[4]) { |
557 | int i; | |
558 | int id = 0; | |
559 | ||
560 | for (i = 0; i < 4; i++) | |
561 | if (s[i] >= '0' && s[i] <= '9') | |
562 | id |= (s[i] - '0') << (3 - i) * 4; | |
563 | else if (s[i] >= 'A' && s[i] <= 'F') | |
564 | id |= (s[i] - 'A' + 10) << (3 - i) * 4; | |
565 | else | |
7e8185ef | 566 | return -EINVAL; |
4d34c495 KS |
567 | |
568 | return id; | |
569 | } | |
570 | ||
9db11a99 LP |
571 | static int cmp_uint16(const void *_a, const void *_b) { |
572 | const uint16_t *a = _a, *b = _b; | |
573 | ||
02a6fc3e | 574 | return (int)*a - (int)*b; |
9db11a99 LP |
575 | } |
576 | ||
9cde64ff LP |
577 | int efi_get_boot_options(uint16_t **options) { |
578 | _cleanup_closedir_ DIR *dir = NULL; | |
579 | struct dirent *de; | |
b7749eb5 | 580 | _cleanup_free_ uint16_t *list = NULL; |
7432b24b | 581 | size_t alloc = 0; |
b7749eb5 | 582 | int count = 0; |
9cde64ff LP |
583 | |
584 | assert(options); | |
585 | ||
586 | dir = opendir("/sys/firmware/efi/efivars/"); | |
587 | if (!dir) | |
588 | return -errno; | |
589 | ||
b7749eb5 | 590 | FOREACH_DIRENT(de, dir, return -errno) { |
4d34c495 | 591 | int id; |
9cde64ff LP |
592 | |
593 | if (strncmp(de->d_name, "Boot", 4) != 0) | |
594 | continue; | |
595 | ||
4d34c495 | 596 | if (strlen(de->d_name) != 45) |
9cde64ff LP |
597 | continue; |
598 | ||
599 | if (strcmp(de->d_name + 8, "-8be4df61-93ca-11d2-aa0d-00e098032b8c") != 0) | |
600 | continue; | |
601 | ||
4d34c495 KS |
602 | id = boot_id_hex(de->d_name + 4); |
603 | if (id < 0) | |
9cde64ff LP |
604 | continue; |
605 | ||
7432b24b | 606 | if (!GREEDY_REALLOC(list, alloc, count + 1)) |
b7749eb5 | 607 | return -ENOMEM; |
9cde64ff | 608 | |
7432b24b | 609 | list[count++] = id; |
9cde64ff LP |
610 | } |
611 | ||
7ff7394d | 612 | qsort_safe(list, count, sizeof(uint16_t), cmp_uint16); |
9db11a99 | 613 | |
9cde64ff | 614 | *options = list; |
b7749eb5 | 615 | list = NULL; |
9cde64ff | 616 | return count; |
7b4d7cc0 KS |
617 | } |
618 | ||
5dbe9f53 | 619 | static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) { |
2e3d0692 | 620 | _cleanup_free_ char *j = NULL; |
2e3d0692 | 621 | int r; |
39883f62 | 622 | uint64_t x = 0; |
2e3d0692 LP |
623 | |
624 | assert(name); | |
625 | assert(u); | |
626 | ||
61cc634b | 627 | r = efi_get_variable_string(EFI_VENDOR_LOADER, name, &j); |
2e3d0692 LP |
628 | if (r < 0) |
629 | return r; | |
630 | ||
2e3d0692 LP |
631 | r = safe_atou64(j, &x); |
632 | if (r < 0) | |
633 | return r; | |
634 | ||
5dbe9f53 | 635 | *u = x; |
2e3d0692 LP |
636 | return 0; |
637 | } | |
638 | ||
c51d84dc | 639 | int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) { |
2e3d0692 LP |
640 | uint64_t x, y; |
641 | int r; | |
2e3d0692 LP |
642 | |
643 | assert(firmware); | |
644 | assert(loader); | |
645 | ||
e9cea16d | 646 | r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x); |
2e3d0692 LP |
647 | if (r < 0) |
648 | return r; | |
649 | ||
e9cea16d | 650 | r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y); |
2e3d0692 LP |
651 | if (r < 0) |
652 | return r; | |
653 | ||
654 | if (y == 0 || y < x) | |
655 | return -EIO; | |
656 | ||
657 | if (y > USEC_PER_HOUR) | |
658 | return -EIO; | |
659 | ||
660 | *firmware = x; | |
661 | *loader = y; | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
c51d84dc | 666 | int efi_loader_get_device_part_uuid(sd_id128_t *u) { |
f4ce2b3e | 667 | _cleanup_free_ char *p = NULL; |
f4ce2b3e | 668 | int r, parsed[16]; |
f4ce2b3e | 669 | |
61cc634b | 670 | r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p); |
f4ce2b3e LP |
671 | if (r < 0) |
672 | return r; | |
673 | ||
f4ce2b3e LP |
674 | if (sscanf(p, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
675 | &parsed[0], &parsed[1], &parsed[2], &parsed[3], | |
676 | &parsed[4], &parsed[5], &parsed[6], &parsed[7], | |
677 | &parsed[8], &parsed[9], &parsed[10], &parsed[11], | |
678 | &parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16) | |
679 | return -EIO; | |
680 | ||
73b80ec2 LP |
681 | if (u) { |
682 | unsigned i; | |
683 | ||
684 | for (i = 0; i < ELEMENTSOF(parsed); i++) | |
685 | u->bytes[i] = parsed[i]; | |
686 | } | |
f4ce2b3e LP |
687 | |
688 | return 0; | |
689 | } | |
b872e9a0 LP |
690 | |
691 | #endif | |
b28ce7c6 TG |
692 | |
693 | char *efi_tilt_backslashes(char *s) { | |
694 | char *p; | |
695 | ||
696 | for (p = s; *p; p++) | |
697 | if (*p == '\\') | |
698 | *p = '/'; | |
699 | ||
700 | return s; | |
701 | } |