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MIPS: eBPF: Fix icache flush end address
[linux/fpc-iii.git] / drivers / firmware / efi / efivars.c
blob8061667a6765aeb6752a50c134edf60414e7d652
1 /*
2 * Originally from efivars.c,
3 *
4 * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
5 * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
6 *
7 * This code takes all variables accessible from EFI runtime and
8 * exports them via sysfs
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Changelog:
25 *
26 * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com>
27 * remove check for efi_enabled in exit
28 * add MODULE_VERSION
29 *
30 * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com>
31 * minor bug fixes
32 *
33 * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com)
34 * converted driver to export variable information via sysfs
35 * and moved to drivers/firmware directory
36 * bumped revision number to v0.07 to reflect conversion & move
37 *
38 * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com>
39 * fix locking per Peter Chubb's findings
40 *
41 * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com>
42 * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_to_str()
43 *
44 * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
45 * use list_for_each_safe when deleting vars.
46 * remove ifdef CONFIG_SMP around include <linux/smp.h>
47 * v0.04 release to linux-ia64@linuxia64.org
48 *
49 * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com>
50 * Moved vars from /proc/efi to /proc/efi/vars, and made
51 * efi.c own the /proc/efi directory.
52 * v0.03 release to linux-ia64@linuxia64.org
53 *
54 * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
55 * At the request of Stephane, moved ownership of /proc/efi
56 * to efi.c, and now efivars lives under /proc/efi/vars.
57 *
58 * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
59 * Feedback received from Stephane Eranian incorporated.
60 * efivar_write() checks copy_from_user() return value.
61 * efivar_read/write() returns proper errno.
62 * v0.02 release to linux-ia64@linuxia64.org
63 *
64 * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com>
65 * v0.01 release to linux-ia64@linuxia64.org
66 */
67
68 #include <linux/efi.h>
69 #include <linux/module.h>
70 #include <linux/slab.h>
71 #include <linux/ucs2_string.h>
72 #include <linux/compat.h>
73
74 #define EFIVARS_VERSION "0.08"
75 #define EFIVARS_DATE "2004-May-17"
76
77 MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
78 MODULE_DESCRIPTION("sysfs interface to EFI Variables");
79 MODULE_LICENSE("GPL");
80 MODULE_VERSION(EFIVARS_VERSION);
81 MODULE_ALIAS("platform:efivars");
82
83 LIST_HEAD(efivar_sysfs_list);
84 EXPORT_SYMBOL_GPL(efivar_sysfs_list);
85
86 static struct kset *efivars_kset;
87
88 static struct bin_attribute *efivars_new_var;
89 static struct bin_attribute *efivars_del_var;
90
91 struct compat_efi_variable {
92 efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
93 efi_guid_t VendorGuid;
94 __u32 DataSize;
95 __u8 Data[1024];
96 __u32 Status;
97 __u32 Attributes;
98 } __packed;
99
100 struct efivar_attribute {
101 struct attribute attr;
102 ssize_t (*show) (struct efivar_entry *entry, char *buf);
103 ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
104 };
105
106 #define EFIVAR_ATTR(_name, _mode, _show, _store) \
107 struct efivar_attribute efivar_attr_##_name = { \
108 .attr = {.name = __stringify(_name), .mode = _mode}, \
109 .show = _show, \
110 .store = _store, \
111 };
112
113 #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr)
114 #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj)
115
116 /*
117 * Prototype for sysfs creation function
118 */
119 static int
120 efivar_create_sysfs_entry(struct efivar_entry *new_var);
121
122 static ssize_t
123 efivar_guid_read(struct efivar_entry *entry, char *buf)
124 {
125 struct efi_variable *var = &entry->var;
126 char *str = buf;
127
128 if (!entry || !buf)
129 return 0;
130
131 efi_guid_to_str(&var->VendorGuid, str);
132 str += strlen(str);
133 str += sprintf(str, "\n");
134
135 return str - buf;
136 }
137
138 static ssize_t
139 efivar_attr_read(struct efivar_entry *entry, char *buf)
140 {
141 struct efi_variable *var = &entry->var;
142 char *str = buf;
143
144 if (!entry || !buf)
145 return -EINVAL;
146
147 var->DataSize = 1024;
148 if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
149 return -EIO;
150
151 if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
152 str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n");
153 if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)
154 str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n");
155 if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)
156 str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n");
157 if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD)
158 str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n");
159 if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
160 str += sprintf(str,
161 "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n");
162 if (var->Attributes &
163 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)
164 str += sprintf(str,
165 "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n");
166 if (var->Attributes & EFI_VARIABLE_APPEND_WRITE)
167 str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n");
168 return str - buf;
169 }
170
171 static ssize_t
172 efivar_size_read(struct efivar_entry *entry, char *buf)
173 {
174 struct efi_variable *var = &entry->var;
175 char *str = buf;
176
177 if (!entry || !buf)
178 return -EINVAL;
179
180 var->DataSize = 1024;
181 if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
182 return -EIO;
183
184 str += sprintf(str, "0x%lx\n", var->DataSize);
185 return str - buf;
186 }
187
188 static ssize_t
189 efivar_data_read(struct efivar_entry *entry, char *buf)
190 {
191 struct efi_variable *var = &entry->var;
192
193 if (!entry || !buf)
194 return -EINVAL;
195
196 var->DataSize = 1024;
197 if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
198 return -EIO;
199
200 memcpy(buf, var->Data, var->DataSize);
201 return var->DataSize;
202 }
203
204 static inline int
205 sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
206 unsigned long size, u32 attributes, u8 *data)
207 {
208 /*
209 * If only updating the variable data, then the name
210 * and guid should remain the same
211 */
212 if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
213 efi_guidcmp(vendor, var->VendorGuid)) {
214 printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
215 return -EINVAL;
216 }
217
218 if ((size <= 0) || (attributes == 0)){
219 printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
220 return -EINVAL;
221 }
222
223 if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
224 efivar_validate(vendor, name, data, size) == false) {
225 printk(KERN_ERR "efivars: Malformed variable content\n");
226 return -EINVAL;
227 }
228
229 return 0;
230 }
231
232 static void
233 copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)
234 {
235 memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN);
236 memcpy(dst->Data, src->Data, sizeof(src->Data));
237
238 dst->VendorGuid = src->VendorGuid;
239 dst->DataSize = src->DataSize;
240 dst->Attributes = src->Attributes;
241 }
242
243 /*
244 * We allow each variable to be edited via rewriting the
245 * entire efi variable structure.
246 */
247 static ssize_t
248 efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
249 {
250 struct efi_variable *new_var, *var = &entry->var;
251 efi_char16_t *name;
252 unsigned long size;
253 efi_guid_t vendor;
254 u32 attributes;
255 u8 *data;
256 int err;
257
258 if (in_compat_syscall()) {
259 struct compat_efi_variable *compat;
260
261 if (count != sizeof(*compat))
262 return -EINVAL;
263
264 compat = (struct compat_efi_variable *)buf;
265 attributes = compat->Attributes;
266 vendor = compat->VendorGuid;
267 name = compat->VariableName;
268 size = compat->DataSize;
269 data = compat->Data;
270
271 err = sanity_check(var, name, vendor, size, attributes, data);
272 if (err)
273 return err;
274
275 copy_out_compat(&entry->var, compat);
276 } else {
277 if (count != sizeof(struct efi_variable))
278 return -EINVAL;
279
280 new_var = (struct efi_variable *)buf;
281
282 attributes = new_var->Attributes;
283 vendor = new_var->VendorGuid;
284 name = new_var->VariableName;
285 size = new_var->DataSize;
286 data = new_var->Data;
287
288 err = sanity_check(var, name, vendor, size, attributes, data);
289 if (err)
290 return err;
291
292 memcpy(&entry->var, new_var, count);
293 }
294
295 err = efivar_entry_set(entry, attributes, size, data, NULL);
296 if (err) {
297 printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
298 return -EIO;
299 }
300
301 return count;
302 }
303
304 static ssize_t
305 efivar_show_raw(struct efivar_entry *entry, char *buf)
306 {
307 struct efi_variable *var = &entry->var;
308 struct compat_efi_variable *compat;
309 size_t size;
310
311 if (!entry || !buf)
312 return 0;
313
314 var->DataSize = 1024;
315 if (efivar_entry_get(entry, &entry->var.Attributes,
316 &entry->var.DataSize, entry->var.Data))
317 return -EIO;
318
319 if (in_compat_syscall()) {
320 compat = (struct compat_efi_variable *)buf;
321
322 size = sizeof(*compat);
323 memcpy(compat->VariableName, var->VariableName,
324 EFI_VAR_NAME_LEN);
325 memcpy(compat->Data, var->Data, sizeof(compat->Data));
326
327 compat->VendorGuid = var->VendorGuid;
328 compat->DataSize = var->DataSize;
329 compat->Attributes = var->Attributes;
330 } else {
331 size = sizeof(*var);
332 memcpy(buf, var, size);
333 }
334
335 return size;
336 }
337
338 /*
339 * Generic read/write functions that call the specific functions of
340 * the attributes...
341 */
342 static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr,
343 char *buf)
344 {
345 struct efivar_entry *var = to_efivar_entry(kobj);
346 struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
347 ssize_t ret = -EIO;
348
349 if (!capable(CAP_SYS_ADMIN))
350 return -EACCES;
351
352 if (efivar_attr->show) {
353 ret = efivar_attr->show(var, buf);
354 }
355 return ret;
356 }
357
358 static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr,
359 const char *buf, size_t count)
360 {
361 struct efivar_entry *var = to_efivar_entry(kobj);
362 struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
363 ssize_t ret = -EIO;
364
365 if (!capable(CAP_SYS_ADMIN))
366 return -EACCES;
367
368 if (efivar_attr->store)
369 ret = efivar_attr->store(var, buf, count);
370
371 return ret;
372 }
373
374 static const struct sysfs_ops efivar_attr_ops = {
375 .show = efivar_attr_show,
376 .store = efivar_attr_store,
377 };
378
379 static void efivar_release(struct kobject *kobj)
380 {
381 struct efivar_entry *var = to_efivar_entry(kobj);
382 kfree(var);
383 }
384
385 static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL);
386 static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL);
387 static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL);
388 static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL);
389 static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw);
390
391 static struct attribute *def_attrs[] = {
392 &efivar_attr_guid.attr,
393 &efivar_attr_size.attr,
394 &efivar_attr_attributes.attr,
395 &efivar_attr_data.attr,
396 &efivar_attr_raw_var.attr,
397 NULL,
398 };
399
400 static struct kobj_type efivar_ktype = {
401 .release = efivar_release,
402 .sysfs_ops = &efivar_attr_ops,
403 .default_attrs = def_attrs,
404 };
405
406 static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
407 struct bin_attribute *bin_attr,
408 char *buf, loff_t pos, size_t count)
409 {
410 struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;
411 struct efi_variable *new_var = (struct efi_variable *)buf;
412 struct efivar_entry *new_entry;
413 bool need_compat = in_compat_syscall();
414 efi_char16_t *name;
415 unsigned long size;
416 u32 attributes;
417 u8 *data;
418 int err;
419
420 if (!capable(CAP_SYS_ADMIN))
421 return -EACCES;
422
423 if (need_compat) {
424 if (count != sizeof(*compat))
425 return -EINVAL;
426
427 attributes = compat->Attributes;
428 name = compat->VariableName;
429 size = compat->DataSize;
430 data = compat->Data;
431 } else {
432 if (count != sizeof(*new_var))
433 return -EINVAL;
434
435 attributes = new_var->Attributes;
436 name = new_var->VariableName;
437 size = new_var->DataSize;
438 data = new_var->Data;
439 }
440
441 if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
442 efivar_validate(new_var->VendorGuid, name, data,
443 size) == false) {
444 printk(KERN_ERR "efivars: Malformed variable content\n");
445 return -EINVAL;
446 }
447
448 new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
449 if (!new_entry)
450 return -ENOMEM;
451
452 if (need_compat)
453 copy_out_compat(&new_entry->var, compat);
454 else
455 memcpy(&new_entry->var, new_var, sizeof(*new_var));
456
457 err = efivar_entry_set(new_entry, attributes, size,
458 data, &efivar_sysfs_list);
459 if (err) {
460 if (err == -EEXIST)
461 err = -EINVAL;
462 goto out;
463 }
464
465 if (efivar_create_sysfs_entry(new_entry)) {
466 printk(KERN_WARNING "efivars: failed to create sysfs entry.\n");
467 kfree(new_entry);
468 }
469 return count;
470
471 out:
472 kfree(new_entry);
473 return err;
474 }
475
476 static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
477 struct bin_attribute *bin_attr,
478 char *buf, loff_t pos, size_t count)
479 {
480 struct efi_variable *del_var = (struct efi_variable *)buf;
481 struct compat_efi_variable *compat;
482 struct efivar_entry *entry;
483 efi_char16_t *name;
484 efi_guid_t vendor;
485 int err = 0;
486
487 if (!capable(CAP_SYS_ADMIN))
488 return -EACCES;
489
490 if (in_compat_syscall()) {
491 if (count != sizeof(*compat))
492 return -EINVAL;
493
494 compat = (struct compat_efi_variable *)buf;
495 name = compat->VariableName;
496 vendor = compat->VendorGuid;
497 } else {
498 if (count != sizeof(*del_var))
499 return -EINVAL;
500
501 name = del_var->VariableName;
502 vendor = del_var->VendorGuid;
503 }
504
505 if (efivar_entry_iter_begin())
506 return -EINTR;
507 entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
508 if (!entry)
509 err = -EINVAL;
510 else if (__efivar_entry_delete(entry))
511 err = -EIO;
512
513 if (err) {
514 efivar_entry_iter_end();
515 return err;
516 }
517
518 if (!entry->scanning) {
519 efivar_entry_iter_end();
520 efivar_unregister(entry);
521 } else
522 efivar_entry_iter_end();
523
524 /* It's dead Jim.... */
525 return count;
526 }
527
528 /**
529 * efivar_create_sysfs_entry - create a new entry in sysfs
530 * @new_var: efivar entry to create
531 *
532 * Returns 0 on success, negative error code on failure
533 */
534 static int
535 efivar_create_sysfs_entry(struct efivar_entry *new_var)
536 {
537 int short_name_size;
538 char *short_name;
539 unsigned long utf8_name_size;
540 efi_char16_t *variable_name = new_var->var.VariableName;
541 int ret;
542
543 /*
544 * Length of the variable bytes in UTF8, plus the '-' separator,
545 * plus the GUID, plus trailing NUL
546 */
547 utf8_name_size = ucs2_utf8size(variable_name);
548 short_name_size = utf8_name_size + 1 + EFI_VARIABLE_GUID_LEN + 1;
549
550 short_name = kmalloc(short_name_size, GFP_KERNEL);
551 if (!short_name)
552 return -ENOMEM;
553
554 ucs2_as_utf8(short_name, variable_name, short_name_size);
555
556 /* This is ugly, but necessary to separate one vendor's
557 private variables from another's. */
558 short_name[utf8_name_size] = '-';
559 efi_guid_to_str(&new_var->var.VendorGuid,
560 short_name + utf8_name_size + 1);
561
562 new_var->kobj.kset = efivars_kset;
563
564 ret = kobject_init_and_add(&new_var->kobj, &efivar_ktype,
565 NULL, "%s", short_name);
566 kfree(short_name);
567 if (ret)
568 return ret;
569
570 kobject_uevent(&new_var->kobj, KOBJ_ADD);
571 if (efivar_entry_add(new_var, &efivar_sysfs_list)) {
572 efivar_unregister(new_var);
573 return -EINTR;
574 }
575
576 return 0;
577 }
578
579 static int
580 create_efivars_bin_attributes(void)
581 {
582 struct bin_attribute *attr;
583 int error;
584
585 /* new_var */
586 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
587 if (!attr)
588 return -ENOMEM;
589
590 attr->attr.name = "new_var";
591 attr->attr.mode = 0200;
592 attr->write = efivar_create;
593 efivars_new_var = attr;
594
595 /* del_var */
596 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
597 if (!attr) {
598 error = -ENOMEM;
599 goto out_free;
600 }
601 attr->attr.name = "del_var";
602 attr->attr.mode = 0200;
603 attr->write = efivar_delete;
604 efivars_del_var = attr;
605
606 sysfs_bin_attr_init(efivars_new_var);
607 sysfs_bin_attr_init(efivars_del_var);
608
609 /* Register */
610 error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var);
611 if (error) {
612 printk(KERN_ERR "efivars: unable to create new_var sysfs file"
613 " due to error %d\n", error);
614 goto out_free;
615 }
616
617 error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var);
618 if (error) {
619 printk(KERN_ERR "efivars: unable to create del_var sysfs file"
620 " due to error %d\n", error);
621 sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
622 goto out_free;
623 }
624
625 return 0;
626 out_free:
627 kfree(efivars_del_var);
628 efivars_del_var = NULL;
629 kfree(efivars_new_var);
630 efivars_new_var = NULL;
631 return error;
632 }
633
634 static int efivar_update_sysfs_entry(efi_char16_t *name, efi_guid_t vendor,
635 unsigned long name_size, void *data)
636 {
637 struct efivar_entry *entry = data;
638
639 if (efivar_entry_find(name, vendor, &efivar_sysfs_list, false))
640 return 0;
641
642 memcpy(entry->var.VariableName, name, name_size);
643 memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
644
645 return 1;
646 }
647
648 static void efivar_update_sysfs_entries(struct work_struct *work)
649 {
650 struct efivar_entry *entry;
651 int err;
652
653 /* Add new sysfs entries */
654 while (1) {
655 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
656 if (!entry)
657 return;
658
659 err = efivar_init(efivar_update_sysfs_entry, entry,
660 false, &efivar_sysfs_list);
661 if (!err)
662 break;
663
664 efivar_create_sysfs_entry(entry);
665 }
666
667 kfree(entry);
668 }
669
670 static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
671 unsigned long name_size, void *data)
672 {
673 struct efivar_entry *entry;
674
675 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
676 if (!entry)
677 return -ENOMEM;
678
679 memcpy(entry->var.VariableName, name, name_size);
680 memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
681
682 efivar_create_sysfs_entry(entry);
683
684 return 0;
685 }
686
687 static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
688 {
689 int err = efivar_entry_remove(entry);
690
691 if (err)
692 return err;
693 efivar_unregister(entry);
694 return 0;
695 }
696
697 static void efivars_sysfs_exit(void)
698 {
699 /* Remove all entries and destroy */
700 int err;
701
702 err = __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list,
703 NULL, NULL);
704 if (err) {
705 pr_err("efivars: Failed to destroy sysfs entries\n");
706 return;
707 }
708
709 if (efivars_new_var)
710 sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
711 if (efivars_del_var)
712 sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var);
713 kfree(efivars_new_var);
714 kfree(efivars_del_var);
715 kset_unregister(efivars_kset);
716 }
717
718 int efivars_sysfs_init(void)
719 {
720 struct kobject *parent_kobj = efivars_kobject();
721 int error = 0;
722
723 if (!efi_enabled(EFI_RUNTIME_SERVICES))
724 return -ENODEV;
725
726 /* No efivars has been registered yet */
727 if (!parent_kobj)
728 return 0;
729
730 printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
731 EFIVARS_DATE);
732
733 efivars_kset = kset_create_and_add("vars", NULL, parent_kobj);
734 if (!efivars_kset) {
735 printk(KERN_ERR "efivars: Subsystem registration failed.\n");
736 return -ENOMEM;
737 }
738
739 efivar_init(efivars_sysfs_callback, NULL, true, &efivar_sysfs_list);
740
741 error = create_efivars_bin_attributes();
742 if (error) {
743 efivars_sysfs_exit();
744 return error;
745 }
746
747 INIT_WORK(&efivar_work, efivar_update_sysfs_entries);
748
749 return 0;
750 }
751 EXPORT_SYMBOL_GPL(efivars_sysfs_init);
752
753 module_init(efivars_sysfs_init);
754 module_exit(efivars_sysfs_exit);
Linux with added FPC-III support