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15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17#include <linux/kobject.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/debugfs.h>
21#include <linux/device.h>
22#include <linux/efi.h>
23#include <linux/of.h>
24#include <linux/io.h>
25#include <linux/kexec.h>
26#include <linux/platform_device.h>
27#include <linux/random.h>
28#include <linux/reboot.h>
29#include <linux/slab.h>
30#include <linux/acpi.h>
31#include <linux/ucs2_string.h>
32#include <linux/memblock.h>
33#include <linux/security.h>
34
35#include <asm/early_ioremap.h>
36
37struct efi __read_mostly efi = {
38 .runtime_supported_mask = EFI_RT_SUPPORTED_ALL,
39 .acpi = EFI_INVALID_TABLE_ADDR,
40 .acpi20 = EFI_INVALID_TABLE_ADDR,
41 .smbios = EFI_INVALID_TABLE_ADDR,
42 .smbios3 = EFI_INVALID_TABLE_ADDR,
43 .esrt = EFI_INVALID_TABLE_ADDR,
44 .tpm_log = EFI_INVALID_TABLE_ADDR,
45 .tpm_final_log = EFI_INVALID_TABLE_ADDR,
46#ifdef CONFIG_LOAD_UEFI_KEYS
47 .mokvar_table = EFI_INVALID_TABLE_ADDR,
48#endif
49};
50EXPORT_SYMBOL(efi);
51
52unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR;
53static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR;
54static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR;
55
56struct mm_struct efi_mm = {
57 .mm_rb = RB_ROOT,
58 .mm_users = ATOMIC_INIT(2),
59 .mm_count = ATOMIC_INIT(1),
60 .write_protect_seq = SEQCNT_ZERO(efi_mm.write_protect_seq),
61 MMAP_LOCK_INITIALIZER(efi_mm)
62 .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
63 .mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
64 .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},
65};
66
67struct workqueue_struct *efi_rts_wq;
68
69static bool disable_runtime = IS_ENABLED(CONFIG_PREEMPT_RT);
70static int __init setup_noefi(char *arg)
71{
72 disable_runtime = true;
73 return 0;
74}
75early_param("noefi", setup_noefi);
76
77bool efi_runtime_disabled(void)
78{
79 return disable_runtime;
80}
81
82bool __pure __efi_soft_reserve_enabled(void)
83{
84 return !efi_enabled(EFI_MEM_NO_SOFT_RESERVE);
85}
86
87static int __init parse_efi_cmdline(char *str)
88{
89 if (!str) {
90 pr_warn("need at least one option\n");
91 return -EINVAL;
92 }
93
94 if (parse_option_str(str, "debug"))
95 set_bit(EFI_DBG, &efi.flags);
96
97 if (parse_option_str(str, "noruntime"))
98 disable_runtime = true;
99
100 if (parse_option_str(str, "runtime"))
101 disable_runtime = false;
102
103 if (parse_option_str(str, "nosoftreserve"))
104 set_bit(EFI_MEM_NO_SOFT_RESERVE, &efi.flags);
105
106 return 0;
107}
108early_param("efi", parse_efi_cmdline);
109
110struct kobject *efi_kobj;
111
112
113
114
115
116
117
118static ssize_t systab_show(struct kobject *kobj,
119 struct kobj_attribute *attr, char *buf)
120{
121 char *str = buf;
122
123 if (!kobj || !buf)
124 return -EINVAL;
125
126 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
127 str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
128 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
129 str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
130
131
132
133
134
135 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
136 str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
137 if (efi.smbios != EFI_INVALID_TABLE_ADDR)
138 str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
139
140 if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86))
141 str = efi_systab_show_arch(str);
142
143 return str - buf;
144}
145
146static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
147
148static ssize_t fw_platform_size_show(struct kobject *kobj,
149 struct kobj_attribute *attr, char *buf)
150{
151 return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
152}
153
154extern __weak struct kobj_attribute efi_attr_fw_vendor;
155extern __weak struct kobj_attribute efi_attr_runtime;
156extern __weak struct kobj_attribute efi_attr_config_table;
157static struct kobj_attribute efi_attr_fw_platform_size =
158 __ATTR_RO(fw_platform_size);
159
160static struct attribute *efi_subsys_attrs[] = {
161 &efi_attr_systab.attr,
162 &efi_attr_fw_platform_size.attr,
163 &efi_attr_fw_vendor.attr,
164 &efi_attr_runtime.attr,
165 &efi_attr_config_table.attr,
166 NULL,
167};
168
169umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr,
170 int n)
171{
172 return attr->mode;
173}
174
175static const struct attribute_group efi_subsys_attr_group = {
176 .attrs = efi_subsys_attrs,
177 .is_visible = efi_attr_is_visible,
178};
179
180static struct efivars generic_efivars;
181static struct efivar_operations generic_ops;
182
183static int generic_ops_register(void)
184{
185 generic_ops.get_variable = efi.get_variable;
186 generic_ops.get_next_variable = efi.get_next_variable;
187 generic_ops.query_variable_store = efi_query_variable_store;
188
189 if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) {
190 generic_ops.set_variable = efi.set_variable;
191 generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
192 }
193 return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
194}
195
196static void generic_ops_unregister(void)
197{
198 efivars_unregister(&generic_efivars);
199}
200
201#ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
202#define EFIVAR_SSDT_NAME_MAX 16
203static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
204static int __init efivar_ssdt_setup(char *str)
205{
206 int ret = security_locked_down(LOCKDOWN_ACPI_TABLES);
207
208 if (ret)
209 return ret;
210
211 if (strlen(str) < sizeof(efivar_ssdt))
212 memcpy(efivar_ssdt, str, strlen(str));
213 else
214 pr_warn("efivar_ssdt: name too long: %s\n", str);
215 return 1;
216}
217__setup("efivar_ssdt=", efivar_ssdt_setup);
218
219static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
220 unsigned long name_size, void *data)
221{
222 struct efivar_entry *entry;
223 struct list_head *list = data;
224 char utf8_name[EFIVAR_SSDT_NAME_MAX];
225 int limit = min_t(unsigned long, EFIVAR_SSDT_NAME_MAX, name_size);
226
227 ucs2_as_utf8(utf8_name, name, limit - 1);
228 if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
229 return 0;
230
231 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
232 if (!entry)
233 return 0;
234
235 memcpy(entry->var.VariableName, name, name_size);
236 memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
237
238 efivar_entry_add(entry, list);
239
240 return 0;
241}
242
243static __init int efivar_ssdt_load(void)
244{
245 LIST_HEAD(entries);
246 struct efivar_entry *entry, *aux;
247 unsigned long size;
248 void *data;
249 int ret;
250
251 if (!efivar_ssdt[0])
252 return 0;
253
254 ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
255
256 list_for_each_entry_safe(entry, aux, &entries, list) {
257 pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
258 &entry->var.VendorGuid);
259
260 list_del(&entry->list);
261
262 ret = efivar_entry_size(entry, &size);
263 if (ret) {
264 pr_err("failed to get var size\n");
265 goto free_entry;
266 }
267
268 data = kmalloc(size, GFP_KERNEL);
269 if (!data) {
270 ret = -ENOMEM;
271 goto free_entry;
272 }
273
274 ret = efivar_entry_get(entry, NULL, &size, data);
275 if (ret) {
276 pr_err("failed to get var data\n");
277 goto free_data;
278 }
279
280 ret = acpi_load_table(data, NULL);
281 if (ret) {
282 pr_err("failed to load table: %d\n", ret);
283 goto free_data;
284 }
285
286 goto free_entry;
287
288free_data:
289 kfree(data);
290
291free_entry:
292 kfree(entry);
293 }
294
295 return ret;
296}
297#else
298static inline int efivar_ssdt_load(void) { return 0; }
299#endif
300
301#ifdef CONFIG_DEBUG_FS
302
303#define EFI_DEBUGFS_MAX_BLOBS 32
304
305static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS];
306
307static void __init efi_debugfs_init(void)
308{
309 struct dentry *efi_debugfs;
310 efi_memory_desc_t *md;
311 char name[32];
312 int type_count[EFI_BOOT_SERVICES_DATA + 1] = {};
313 int i = 0;
314
315 efi_debugfs = debugfs_create_dir("efi", NULL);
316 if (IS_ERR_OR_NULL(efi_debugfs))
317 return;
318
319 for_each_efi_memory_desc(md) {
320 switch (md->type) {
321 case EFI_BOOT_SERVICES_CODE:
322 snprintf(name, sizeof(name), "boot_services_code%d",
323 type_count[md->type]++);
324 break;
325 case EFI_BOOT_SERVICES_DATA:
326 snprintf(name, sizeof(name), "boot_services_data%d",
327 type_count[md->type]++);
328 break;
329 default:
330 continue;
331 }
332
333 if (i >= EFI_DEBUGFS_MAX_BLOBS) {
334 pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n",
335 EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS);
336 break;
337 }
338
339 debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT;
340 debugfs_blob[i].data = memremap(md->phys_addr,
341 debugfs_blob[i].size,
342 MEMREMAP_WB);
343 if (!debugfs_blob[i].data)
344 continue;
345
346 debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]);
347 i++;
348 }
349}
350#else
351static inline void efi_debugfs_init(void) {}
352#endif
353
354
355
356
357
358
359static int __init efisubsys_init(void)
360{
361 int error;
362
363 if (!efi_enabled(EFI_RUNTIME_SERVICES))
364 efi.runtime_supported_mask = 0;
365
366 if (!efi_enabled(EFI_BOOT))
367 return 0;
368
369 if (efi.runtime_supported_mask) {
370
371
372
373
374
375 efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0);
376 if (!efi_rts_wq) {
377 pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
378 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
379 efi.runtime_supported_mask = 0;
380 return 0;
381 }
382 }
383
384 if (efi_rt_services_supported(EFI_RT_SUPPORTED_TIME_SERVICES))
385 platform_device_register_simple("rtc-efi", 0, NULL, 0);
386
387
388 efi_kobj = kobject_create_and_add("efi", firmware_kobj);
389 if (!efi_kobj) {
390 pr_err("efi: Firmware registration failed.\n");
391 destroy_workqueue(efi_rts_wq);
392 return -ENOMEM;
393 }
394
395 if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
396 EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
397 error = generic_ops_register();
398 if (error)
399 goto err_put;
400 efivar_ssdt_load();
401 platform_device_register_simple("efivars", 0, NULL, 0);
402 }
403
404 error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
405 if (error) {
406 pr_err("efi: Sysfs attribute export failed with error %d.\n",
407 error);
408 goto err_unregister;
409 }
410
411 error = efi_runtime_map_init(efi_kobj);
412 if (error)
413 goto err_remove_group;
414
415
416 error = sysfs_create_mount_point(efi_kobj, "efivars");
417 if (error) {
418 pr_err("efivars: Subsystem registration failed.\n");
419 goto err_remove_group;
420 }
421
422 if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
423 efi_debugfs_init();
424
425 return 0;
426
427err_remove_group:
428 sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
429err_unregister:
430 if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
431 EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME))
432 generic_ops_unregister();
433err_put:
434 kobject_put(efi_kobj);
435 destroy_workqueue(efi_rts_wq);
436 return error;
437}
438
439subsys_initcall(efisubsys_init);
440
441
442
443
444
445
446
447int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
448{
449 efi_memory_desc_t *md;
450
451 if (!efi_enabled(EFI_MEMMAP)) {
452 pr_err_once("EFI_MEMMAP is not enabled.\n");
453 return -EINVAL;
454 }
455
456 if (!out_md) {
457 pr_err_once("out_md is null.\n");
458 return -EINVAL;
459 }
460
461 for_each_efi_memory_desc(md) {
462 u64 size;
463 u64 end;
464
465 size = md->num_pages << EFI_PAGE_SHIFT;
466 end = md->phys_addr + size;
467 if (phys_addr >= md->phys_addr && phys_addr < end) {
468 memcpy(out_md, md, sizeof(*out_md));
469 return 0;
470 }
471 }
472 return -ENOENT;
473}
474
475
476
477
478u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
479{
480 u64 size = md->num_pages << EFI_PAGE_SHIFT;
481 u64 end = md->phys_addr + size;
482 return end;
483}
484
485void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
486
487
488
489
490
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496
497
498
499void __init efi_mem_reserve(phys_addr_t addr, u64 size)
500{
501 if (!memblock_is_region_reserved(addr, size))
502 memblock_reserve(addr, size);
503
504
505
506
507
508
509
510
511 efi_arch_mem_reserve(addr, size);
512}
513
514static const efi_config_table_type_t common_tables[] __initconst = {
515 {ACPI_20_TABLE_GUID, &efi.acpi20, "ACPI 2.0" },
516 {ACPI_TABLE_GUID, &efi.acpi, "ACPI" },
517 {SMBIOS_TABLE_GUID, &efi.smbios, "SMBIOS" },
518 {SMBIOS3_TABLE_GUID, &efi.smbios3, "SMBIOS 3.0" },
519 {EFI_SYSTEM_RESOURCE_TABLE_GUID, &efi.esrt, "ESRT" },
520 {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, &efi_mem_attr_table, "MEMATTR" },
521 {LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" },
522 {LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" },
523 {LINUX_EFI_TPM_FINAL_LOG_GUID, &efi.tpm_final_log, "TPMFinalLog" },
524 {LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" },
525 {EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" },
526#ifdef CONFIG_EFI_RCI2_TABLE
527 {DELLEMC_EFI_RCI2_TABLE_GUID, &rci2_table_phys },
528#endif
529#ifdef CONFIG_LOAD_UEFI_KEYS
530 {LINUX_EFI_MOK_VARIABLE_TABLE_GUID, &efi.mokvar_table, "MOKvar" },
531#endif
532 {},
533};
534
535static __init int match_config_table(const efi_guid_t *guid,
536 unsigned long table,
537 const efi_config_table_type_t *table_types)
538{
539 int i;
540
541 for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
542 if (!efi_guidcmp(*guid, table_types[i].guid)) {
543 *(table_types[i].ptr) = table;
544 if (table_types[i].name[0])
545 pr_cont("%s=0x%lx ",
546 table_types[i].name, table);
547 return 1;
548 }
549 }
550
551 return 0;
552}
553
554int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
555 int count,
556 const efi_config_table_type_t *arch_tables)
557{
558 const efi_config_table_64_t *tbl64 = (void *)config_tables;
559 const efi_config_table_32_t *tbl32 = (void *)config_tables;
560 const efi_guid_t *guid;
561 unsigned long table;
562 int i;
563
564 pr_info("");
565 for (i = 0; i < count; i++) {
566 if (!IS_ENABLED(CONFIG_X86)) {
567 guid = &config_tables[i].guid;
568 table = (unsigned long)config_tables[i].table;
569 } else if (efi_enabled(EFI_64BIT)) {
570 guid = &tbl64[i].guid;
571 table = tbl64[i].table;
572
573 if (IS_ENABLED(CONFIG_X86_32) &&
574 tbl64[i].table > U32_MAX) {
575 pr_cont("\n");
576 pr_err("Table located above 4GB, disabling EFI.\n");
577 return -EINVAL;
578 }
579 } else {
580 guid = &tbl32[i].guid;
581 table = tbl32[i].table;
582 }
583
584 if (!match_config_table(guid, table, common_tables) && arch_tables)
585 match_config_table(guid, table, arch_tables);
586 }
587 pr_cont("\n");
588 set_bit(EFI_CONFIG_TABLES, &efi.flags);
589
590 if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) {
591 struct linux_efi_random_seed *seed;
592 u32 size = 0;
593
594 seed = early_memremap(efi_rng_seed, sizeof(*seed));
595 if (seed != NULL) {
596 size = READ_ONCE(seed->size);
597 early_memunmap(seed, sizeof(*seed));
598 } else {
599 pr_err("Could not map UEFI random seed!\n");
600 }
601 if (size > 0) {
602 seed = early_memremap(efi_rng_seed,
603 sizeof(*seed) + size);
604 if (seed != NULL) {
605 pr_notice("seeding entropy pool\n");
606 add_bootloader_randomness(seed->bits, size);
607 early_memunmap(seed, sizeof(*seed) + size);
608 } else {
609 pr_err("Could not map UEFI random seed!\n");
610 }
611 }
612 }
613
614 if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP))
615 efi_memattr_init();
616
617 efi_tpm_eventlog_init();
618
619 if (mem_reserve != EFI_INVALID_TABLE_ADDR) {
620 unsigned long prsv = mem_reserve;
621
622 while (prsv) {
623 struct linux_efi_memreserve *rsv;
624 u8 *p;
625
626
627
628
629
630
631 p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE),
632 PAGE_SIZE);
633 if (p == NULL) {
634 pr_err("Could not map UEFI memreserve entry!\n");
635 return -ENOMEM;
636 }
637
638 rsv = (void *)(p + prsv % PAGE_SIZE);
639
640
641 memblock_reserve(prsv,
642 struct_size(rsv, entry, rsv->size));
643
644 for (i = 0; i < atomic_read(&rsv->count); i++) {
645 memblock_reserve(rsv->entry[i].base,
646 rsv->entry[i].size);
647 }
648
649 prsv = rsv->next;
650 early_memunmap(p, PAGE_SIZE);
651 }
652 }
653
654 if (rt_prop != EFI_INVALID_TABLE_ADDR) {
655 efi_rt_properties_table_t *tbl;
656
657 tbl = early_memremap(rt_prop, sizeof(*tbl));
658 if (tbl) {
659 efi.runtime_supported_mask &= tbl->runtime_services_supported;
660 early_memunmap(tbl, sizeof(*tbl));
661 }
662 }
663
664 return 0;
665}
666
667int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr,
668 int min_major_version)
669{
670 if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) {
671 pr_err("System table signature incorrect!\n");
672 return -EINVAL;
673 }
674
675 if ((systab_hdr->revision >> 16) < min_major_version)
676 pr_err("Warning: System table version %d.%02d, expected %d.00 or greater!\n",
677 systab_hdr->revision >> 16,
678 systab_hdr->revision & 0xffff,
679 min_major_version);
680
681 return 0;
682}
683
684#ifndef CONFIG_IA64
685static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor,
686 size_t size)
687{
688 const efi_char16_t *ret;
689
690 ret = early_memremap_ro(fw_vendor, size);
691 if (!ret)
692 pr_err("Could not map the firmware vendor!\n");
693 return ret;
694}
695
696static void __init unmap_fw_vendor(const void *fw_vendor, size_t size)
697{
698 early_memunmap((void *)fw_vendor, size);
699}
700#else
701#define map_fw_vendor(p, s) __va(p)
702#define unmap_fw_vendor(v, s)
703#endif
704
705void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr,
706 unsigned long fw_vendor)
707{
708 char vendor[100] = "unknown";
709 const efi_char16_t *c16;
710 size_t i;
711
712 c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t));
713 if (c16) {
714 for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i)
715 vendor[i] = c16[i];
716 vendor[i] = '\0';
717
718 unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t));
719 }
720
721 pr_info("EFI v%u.%.02u by %s\n",
722 systab_hdr->revision >> 16,
723 systab_hdr->revision & 0xffff,
724 vendor);
725
726 if (IS_ENABLED(CONFIG_X86_64) &&
727 systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION &&
728 !strcmp(vendor, "Apple")) {
729 pr_info("Apple Mac detected, using EFI v1.10 runtime services only\n");
730 efi.runtime_version = EFI_1_10_SYSTEM_TABLE_REVISION;
731 }
732}
733
734static __initdata char memory_type_name[][13] = {
735 "Reserved",
736 "Loader Code",
737 "Loader Data",
738 "Boot Code",
739 "Boot Data",
740 "Runtime Code",
741 "Runtime Data",
742 "Conventional",
743 "Unusable",
744 "ACPI Reclaim",
745 "ACPI Mem NVS",
746 "MMIO",
747 "MMIO Port",
748 "PAL Code",
749 "Persistent",
750};
751
752char * __init efi_md_typeattr_format(char *buf, size_t size,
753 const efi_memory_desc_t *md)
754{
755 char *pos;
756 int type_len;
757 u64 attr;
758
759 pos = buf;
760 if (md->type >= ARRAY_SIZE(memory_type_name))
761 type_len = snprintf(pos, size, "[type=%u", md->type);
762 else
763 type_len = snprintf(pos, size, "[%-*s",
764 (int)(sizeof(memory_type_name[0]) - 1),
765 memory_type_name[md->type]);
766 if (type_len >= size)
767 return buf;
768
769 pos += type_len;
770 size -= type_len;
771
772 attr = md->attribute;
773 if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
774 EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
775 EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
776 EFI_MEMORY_NV | EFI_MEMORY_SP | EFI_MEMORY_CPU_CRYPTO |
777 EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
778 snprintf(pos, size, "|attr=0x%016llx]",
779 (unsigned long long)attr);
780 else
781 snprintf(pos, size,
782 "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
783 attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
784 attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
785 attr & EFI_MEMORY_CPU_CRYPTO ? "CC" : "",
786 attr & EFI_MEMORY_SP ? "SP" : "",
787 attr & EFI_MEMORY_NV ? "NV" : "",
788 attr & EFI_MEMORY_XP ? "XP" : "",
789 attr & EFI_MEMORY_RP ? "RP" : "",
790 attr & EFI_MEMORY_WP ? "WP" : "",
791 attr & EFI_MEMORY_RO ? "RO" : "",
792 attr & EFI_MEMORY_UCE ? "UCE" : "",
793 attr & EFI_MEMORY_WB ? "WB" : "",
794 attr & EFI_MEMORY_WT ? "WT" : "",
795 attr & EFI_MEMORY_WC ? "WC" : "",
796 attr & EFI_MEMORY_UC ? "UC" : "");
797 return buf;
798}
799
800
801
802
803
804#ifndef CONFIG_IA64
805
806
807
808
809
810
811
812
813u64 efi_mem_attributes(unsigned long phys_addr)
814{
815 efi_memory_desc_t *md;
816
817 if (!efi_enabled(EFI_MEMMAP))
818 return 0;
819
820 for_each_efi_memory_desc(md) {
821 if ((md->phys_addr <= phys_addr) &&
822 (phys_addr < (md->phys_addr +
823 (md->num_pages << EFI_PAGE_SHIFT))))
824 return md->attribute;
825 }
826 return 0;
827}
828
829
830
831
832
833
834
835
836
837int efi_mem_type(unsigned long phys_addr)
838{
839 const efi_memory_desc_t *md;
840
841 if (!efi_enabled(EFI_MEMMAP))
842 return -ENOTSUPP;
843
844 for_each_efi_memory_desc(md) {
845 if ((md->phys_addr <= phys_addr) &&
846 (phys_addr < (md->phys_addr +
847 (md->num_pages << EFI_PAGE_SHIFT))))
848 return md->type;
849 }
850 return -EINVAL;
851}
852#endif
853
854int efi_status_to_err(efi_status_t status)
855{
856 int err;
857
858 switch (status) {
859 case EFI_SUCCESS:
860 err = 0;
861 break;
862 case EFI_INVALID_PARAMETER:
863 err = -EINVAL;
864 break;
865 case EFI_OUT_OF_RESOURCES:
866 err = -ENOSPC;
867 break;
868 case EFI_DEVICE_ERROR:
869 err = -EIO;
870 break;
871 case EFI_WRITE_PROTECTED:
872 err = -EROFS;
873 break;
874 case EFI_SECURITY_VIOLATION:
875 err = -EACCES;
876 break;
877 case EFI_NOT_FOUND:
878 err = -ENOENT;
879 break;
880 case EFI_ABORTED:
881 err = -EINTR;
882 break;
883 default:
884 err = -EINVAL;
885 }
886
887 return err;
888}
889
890static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock);
891static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init;
892
893static int __init efi_memreserve_map_root(void)
894{
895 if (mem_reserve == EFI_INVALID_TABLE_ADDR)
896 return -ENODEV;
897
898 efi_memreserve_root = memremap(mem_reserve,
899 sizeof(*efi_memreserve_root),
900 MEMREMAP_WB);
901 if (WARN_ON_ONCE(!efi_memreserve_root))
902 return -ENOMEM;
903 return 0;
904}
905
906static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size)
907{
908 struct resource *res, *parent;
909 int ret;
910
911 res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
912 if (!res)
913 return -ENOMEM;
914
915 res->name = "reserved";
916 res->flags = IORESOURCE_MEM;
917 res->start = addr;
918 res->end = addr + size - 1;
919
920
921 parent = request_resource_conflict(&iomem_resource, res);
922 ret = parent ? request_resource(parent, res) : 0;
923
924
925
926
927
928
929 if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK) && !ret)
930 memblock_reserve(addr, size);
931
932 return ret;
933}
934
935int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
936{
937 struct linux_efi_memreserve *rsv;
938 unsigned long prsv;
939 int rc, index;
940
941 if (efi_memreserve_root == (void *)ULONG_MAX)
942 return -ENODEV;
943
944 if (!efi_memreserve_root) {
945 rc = efi_memreserve_map_root();
946 if (rc)
947 return rc;
948 }
949
950
951 for (prsv = efi_memreserve_root->next; prsv; ) {
952 rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB);
953 index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size);
954 if (index < rsv->size) {
955 rsv->entry[index].base = addr;
956 rsv->entry[index].size = size;
957
958 memunmap(rsv);
959 return efi_mem_reserve_iomem(addr, size);
960 }
961 prsv = rsv->next;
962 memunmap(rsv);
963 }
964
965
966 rsv = (struct linux_efi_memreserve *)__get_free_page(GFP_ATOMIC);
967 if (!rsv)
968 return -ENOMEM;
969
970 rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K);
971 if (rc) {
972 free_page((unsigned long)rsv);
973 return rc;
974 }
975
976
977
978
979
980
981
982 rsv->size = EFI_MEMRESERVE_COUNT(SZ_4K);
983 atomic_set(&rsv->count, 1);
984 rsv->entry[0].base = addr;
985 rsv->entry[0].size = size;
986
987 spin_lock(&efi_mem_reserve_persistent_lock);
988 rsv->next = efi_memreserve_root->next;
989 efi_memreserve_root->next = __pa(rsv);
990 spin_unlock(&efi_mem_reserve_persistent_lock);
991
992 return efi_mem_reserve_iomem(addr, size);
993}
994
995static int __init efi_memreserve_root_init(void)
996{
997 if (efi_memreserve_root)
998 return 0;
999 if (efi_memreserve_map_root())
1000 efi_memreserve_root = (void *)ULONG_MAX;
1001 return 0;
1002}
1003early_initcall(efi_memreserve_root_init);
1004
1005#ifdef CONFIG_KEXEC
1006static int update_efi_random_seed(struct notifier_block *nb,
1007 unsigned long code, void *unused)
1008{
1009 struct linux_efi_random_seed *seed;
1010 u32 size = 0;
1011
1012 if (!kexec_in_progress)
1013 return NOTIFY_DONE;
1014
1015 seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB);
1016 if (seed != NULL) {
1017 size = min(seed->size, EFI_RANDOM_SEED_SIZE);
1018 memunmap(seed);
1019 } else {
1020 pr_err("Could not map UEFI random seed!\n");
1021 }
1022 if (size > 0) {
1023 seed = memremap(efi_rng_seed, sizeof(*seed) + size,
1024 MEMREMAP_WB);
1025 if (seed != NULL) {
1026 seed->size = size;
1027 get_random_bytes(seed->bits, seed->size);
1028 memunmap(seed);
1029 } else {
1030 pr_err("Could not map UEFI random seed!\n");
1031 }
1032 }
1033 return NOTIFY_DONE;
1034}
1035
1036static struct notifier_block efi_random_seed_nb = {
1037 .notifier_call = update_efi_random_seed,
1038};
1039
1040static int __init register_update_efi_random_seed(void)
1041{
1042 if (efi_rng_seed == EFI_INVALID_TABLE_ADDR)
1043 return 0;
1044 return register_reboot_notifier(&efi_random_seed_nb);
1045}
1046late_initcall(register_update_efi_random_seed);
1047#endif
1048
