2 * efi.c - EFI subsystem
4 * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
5 * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
6 * Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
8 * This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
9 * allowing the efivarfs to be mounted or the efivars module to be loaded.
10 * The existance of /sys/firmware/efi may also be used by userspace to
11 * determine that the system supports EFI.
13 * This file is released under the GPLv2.
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/kobject.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/device.h>
22 #include <linux/efi.h>
24 #include <linux/of_fdt.h>
26 #include <linux/kexec.h>
27 #include <linux/platform_device.h>
28 #include <linux/random.h>
29 #include <linux/reboot.h>
30 #include <linux/slab.h>
31 #include <linux/acpi.h>
32 #include <linux/ucs2_string.h>
33 #include <linux/memblock.h>
35 #include <asm/early_ioremap.h>
37 struct efi __read_mostly efi = {
38 .mps = EFI_INVALID_TABLE_ADDR,
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 .sal_systab = EFI_INVALID_TABLE_ADDR,
44 .boot_info = EFI_INVALID_TABLE_ADDR,
45 .hcdp = EFI_INVALID_TABLE_ADDR,
46 .uga = EFI_INVALID_TABLE_ADDR,
47 .uv_systab = EFI_INVALID_TABLE_ADDR,
48 .fw_vendor = EFI_INVALID_TABLE_ADDR,
49 .runtime = EFI_INVALID_TABLE_ADDR,
50 .config_table = EFI_INVALID_TABLE_ADDR,
51 .esrt = EFI_INVALID_TABLE_ADDR,
52 .properties_table = EFI_INVALID_TABLE_ADDR,
53 .mem_attr_table = EFI_INVALID_TABLE_ADDR,
54 .rng_seed = EFI_INVALID_TABLE_ADDR,
58 static bool disable_runtime;
59 static int __init setup_noefi(char *arg)
61 disable_runtime = true;
64 early_param("noefi", setup_noefi);
66 bool efi_runtime_disabled(void)
68 return disable_runtime;
71 static int __init parse_efi_cmdline(char *str)
74 pr_warn("need at least one option\n");
78 if (parse_option_str(str, "debug"))
79 set_bit(EFI_DBG, &efi.flags);
81 if (parse_option_str(str, "noruntime"))
82 disable_runtime = true;
86 early_param("efi", parse_efi_cmdline);
88 struct kobject *efi_kobj;
91 * Let's not leave out systab information that snuck into
94 static ssize_t systab_show(struct kobject *kobj,
95 struct kobj_attribute *attr, char *buf)
102 if (efi.mps != EFI_INVALID_TABLE_ADDR)
103 str += sprintf(str, "MPS=0x%lx\n", efi.mps);
104 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
105 str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
106 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
107 str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
109 * If both SMBIOS and SMBIOS3 entry points are implemented, the
110 * SMBIOS3 entry point shall be preferred, so we list it first to
111 * let applications stop parsing after the first match.
113 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
114 str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
115 if (efi.smbios != EFI_INVALID_TABLE_ADDR)
116 str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
117 if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
118 str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
119 if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
120 str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
121 if (efi.uga != EFI_INVALID_TABLE_ADDR)
122 str += sprintf(str, "UGA=0x%lx\n", efi.uga);
127 static struct kobj_attribute efi_attr_systab =
128 __ATTR(systab, 0400, systab_show, NULL);
130 #define EFI_FIELD(var) efi.var
132 #define EFI_ATTR_SHOW(name) \
133 static ssize_t name##_show(struct kobject *kobj, \
134 struct kobj_attribute *attr, char *buf) \
136 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
139 EFI_ATTR_SHOW(fw_vendor);
140 EFI_ATTR_SHOW(runtime);
141 EFI_ATTR_SHOW(config_table);
143 static ssize_t fw_platform_size_show(struct kobject *kobj,
144 struct kobj_attribute *attr, char *buf)
146 return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
149 static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
150 static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
151 static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
152 static struct kobj_attribute efi_attr_fw_platform_size =
153 __ATTR_RO(fw_platform_size);
155 static struct attribute *efi_subsys_attrs[] = {
156 &efi_attr_systab.attr,
157 &efi_attr_fw_vendor.attr,
158 &efi_attr_runtime.attr,
159 &efi_attr_config_table.attr,
160 &efi_attr_fw_platform_size.attr,
164 static umode_t efi_attr_is_visible(struct kobject *kobj,
165 struct attribute *attr, int n)
167 if (attr == &efi_attr_fw_vendor.attr) {
168 if (efi_enabled(EFI_PARAVIRT) ||
169 efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
171 } else if (attr == &efi_attr_runtime.attr) {
172 if (efi.runtime == EFI_INVALID_TABLE_ADDR)
174 } else if (attr == &efi_attr_config_table.attr) {
175 if (efi.config_table == EFI_INVALID_TABLE_ADDR)
182 static struct attribute_group efi_subsys_attr_group = {
183 .attrs = efi_subsys_attrs,
184 .is_visible = efi_attr_is_visible,
187 static struct efivars generic_efivars;
188 static struct efivar_operations generic_ops;
190 static int generic_ops_register(void)
192 generic_ops.get_variable = efi.get_variable;
193 generic_ops.set_variable = efi.set_variable;
194 generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
195 generic_ops.get_next_variable = efi.get_next_variable;
196 generic_ops.query_variable_store = efi_query_variable_store;
198 return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
201 static void generic_ops_unregister(void)
203 efivars_unregister(&generic_efivars);
206 #if IS_ENABLED(CONFIG_ACPI)
207 #define EFIVAR_SSDT_NAME_MAX 16
208 static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
209 static int __init efivar_ssdt_setup(char *str)
211 if (strlen(str) < sizeof(efivar_ssdt))
212 memcpy(efivar_ssdt, str, strlen(str));
214 pr_warn("efivar_ssdt: name too long: %s\n", str);
217 __setup("efivar_ssdt=", efivar_ssdt_setup);
219 static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
220 unsigned long name_size, void *data)
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);
227 ucs2_as_utf8(utf8_name, name, limit - 1);
228 if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
231 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
235 memcpy(entry->var.VariableName, name, name_size);
236 memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
238 efivar_entry_add(entry, list);
243 static __init int efivar_ssdt_load(void)
246 struct efivar_entry *entry, *aux;
251 ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
253 list_for_each_entry_safe(entry, aux, &entries, list) {
254 pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
255 &entry->var.VendorGuid);
257 list_del(&entry->list);
259 ret = efivar_entry_size(entry, &size);
261 pr_err("failed to get var size\n");
265 data = kmalloc(size, GFP_KERNEL);
271 ret = efivar_entry_get(entry, NULL, &size, data);
273 pr_err("failed to get var data\n");
277 ret = acpi_load_table(data);
279 pr_err("failed to load table: %d\n", ret);
295 static inline int efivar_ssdt_load(void) { return 0; }
299 * We register the efi subsystem with the firmware subsystem and the
300 * efivars subsystem with the efi subsystem, if the system was booted with
303 static int __init efisubsys_init(void)
307 if (!efi_enabled(EFI_BOOT))
310 /* We register the efi directory at /sys/firmware/efi */
311 efi_kobj = kobject_create_and_add("efi", firmware_kobj);
313 pr_err("efi: Firmware registration failed.\n");
317 error = generic_ops_register();
321 if (efi_enabled(EFI_RUNTIME_SERVICES))
324 error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
326 pr_err("efi: Sysfs attribute export failed with error %d.\n",
331 error = efi_runtime_map_init(efi_kobj);
333 goto err_remove_group;
335 /* and the standard mountpoint for efivarfs */
336 error = sysfs_create_mount_point(efi_kobj, "efivars");
338 pr_err("efivars: Subsystem registration failed.\n");
339 goto err_remove_group;
345 sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
347 generic_ops_unregister();
349 kobject_put(efi_kobj);
353 subsys_initcall(efisubsys_init);
356 * Find the efi memory descriptor for a given physical address. Given a
357 * physical address, determine if it exists within an EFI Memory Map entry,
358 * and if so, populate the supplied memory descriptor with the appropriate
361 int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
363 efi_memory_desc_t *md;
365 if (!efi_enabled(EFI_MEMMAP)) {
366 pr_err_once("EFI_MEMMAP is not enabled.\n");
371 pr_err_once("out_md is null.\n");
375 for_each_efi_memory_desc(md) {
379 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
380 md->type != EFI_BOOT_SERVICES_DATA &&
381 md->type != EFI_RUNTIME_SERVICES_DATA) {
385 size = md->num_pages << EFI_PAGE_SHIFT;
386 end = md->phys_addr + size;
387 if (phys_addr >= md->phys_addr && phys_addr < end) {
388 memcpy(out_md, md, sizeof(*out_md));
392 pr_err_once("requested map not found.\n");
397 * Calculate the highest address of an efi memory descriptor.
399 u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
401 u64 size = md->num_pages << EFI_PAGE_SHIFT;
402 u64 end = md->phys_addr + size;
406 void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
409 * efi_mem_reserve - Reserve an EFI memory region
410 * @addr: Physical address to reserve
411 * @size: Size of reservation
413 * Mark a region as reserved from general kernel allocation and
414 * prevent it being released by efi_free_boot_services().
416 * This function should be called drivers once they've parsed EFI
417 * configuration tables to figure out where their data lives, e.g.
420 void __init efi_mem_reserve(phys_addr_t addr, u64 size)
422 if (!memblock_is_region_reserved(addr, size))
423 memblock_reserve(addr, size);
426 * Some architectures (x86) reserve all boot services ranges
427 * until efi_free_boot_services() because of buggy firmware
428 * implementations. This means the above memblock_reserve() is
429 * superfluous on x86 and instead what it needs to do is
430 * ensure the @start, @size is not freed.
432 efi_arch_mem_reserve(addr, size);
435 static __initdata efi_config_table_type_t common_tables[] = {
436 {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
437 {ACPI_TABLE_GUID, "ACPI", &efi.acpi},
438 {HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
439 {MPS_TABLE_GUID, "MPS", &efi.mps},
440 {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
441 {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
442 {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
443 {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
444 {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
445 {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
446 {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
447 {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed},
448 {NULL_GUID, NULL, NULL},
451 static __init int match_config_table(efi_guid_t *guid,
453 efi_config_table_type_t *table_types)
458 for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
459 if (!efi_guidcmp(*guid, table_types[i].guid)) {
460 *(table_types[i].ptr) = table;
461 if (table_types[i].name)
462 pr_cont(" %s=0x%lx ",
463 table_types[i].name, table);
472 int __init efi_config_parse_tables(void *config_tables, int count, int sz,
473 efi_config_table_type_t *arch_tables)
478 tablep = config_tables;
480 for (i = 0; i < count; i++) {
484 if (efi_enabled(EFI_64BIT)) {
486 guid = ((efi_config_table_64_t *)tablep)->guid;
487 table64 = ((efi_config_table_64_t *)tablep)->table;
492 pr_err("Table located above 4GB, disabling EFI.\n");
497 guid = ((efi_config_table_32_t *)tablep)->guid;
498 table = ((efi_config_table_32_t *)tablep)->table;
501 if (!match_config_table(&guid, table, common_tables))
502 match_config_table(&guid, table, arch_tables);
507 set_bit(EFI_CONFIG_TABLES, &efi.flags);
509 if (efi.rng_seed != EFI_INVALID_TABLE_ADDR) {
510 struct linux_efi_random_seed *seed;
513 seed = early_memremap(efi.rng_seed, sizeof(*seed));
516 early_memunmap(seed, sizeof(*seed));
518 pr_err("Could not map UEFI random seed!\n");
521 seed = early_memremap(efi.rng_seed,
522 sizeof(*seed) + size);
524 add_device_randomness(seed->bits, seed->size);
525 early_memunmap(seed, sizeof(*seed) + size);
527 pr_err("Could not map UEFI random seed!\n");
534 /* Parse the EFI Properties table if it exists */
535 if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
536 efi_properties_table_t *tbl;
538 tbl = early_memremap(efi.properties_table, sizeof(*tbl));
540 pr_err("Could not map Properties table!\n");
544 if (tbl->memory_protection_attribute &
545 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
546 set_bit(EFI_NX_PE_DATA, &efi.flags);
548 early_memunmap(tbl, sizeof(*tbl));
554 int __init efi_config_init(efi_config_table_type_t *arch_tables)
559 if (efi_enabled(EFI_64BIT))
560 sz = sizeof(efi_config_table_64_t);
562 sz = sizeof(efi_config_table_32_t);
565 * Let's see what config tables the firmware passed to us.
567 config_tables = early_memremap(efi.systab->tables,
568 efi.systab->nr_tables * sz);
569 if (config_tables == NULL) {
570 pr_err("Could not map Configuration table!\n");
574 ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
577 early_memunmap(config_tables, efi.systab->nr_tables * sz);
581 #ifdef CONFIG_EFI_VARS_MODULE
582 static int __init efi_load_efivars(void)
584 struct platform_device *pdev;
586 if (!efi_enabled(EFI_RUNTIME_SERVICES))
589 pdev = platform_device_register_simple("efivars", 0, NULL, 0);
590 return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
592 device_initcall(efi_load_efivars);
595 #ifdef CONFIG_EFI_PARAMS_FROM_FDT
597 #define UEFI_PARAM(name, prop, field) \
601 offsetof(struct efi_fdt_params, field), \
602 FIELD_SIZEOF(struct efi_fdt_params, field) \
607 const char propname[32];
612 static __initdata struct params fdt_params[] = {
613 UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
614 UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
615 UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
616 UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
617 UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
620 static __initdata struct params xen_fdt_params[] = {
621 UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
622 UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
623 UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
624 UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
625 UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
628 #define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
630 static __initdata struct {
633 struct params *params;
635 { "hypervisor", "uefi", xen_fdt_params },
636 { "chosen", NULL, fdt_params },
645 static int __init __find_uefi_params(unsigned long node,
646 struct param_info *info,
647 struct params *params)
654 for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
655 prop = of_get_flat_dt_prop(node, params[i].propname, &len);
657 info->missing = params[i].name;
661 dest = info->params + params[i].offset;
664 val = of_read_number(prop, len / sizeof(u32));
666 if (params[i].size == sizeof(u32))
671 if (efi_enabled(EFI_DBG))
672 pr_info(" %s: 0x%0*llx\n", params[i].name,
673 params[i].size * 2, val);
679 static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
680 int depth, void *data)
682 struct param_info *info = data;
685 for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
686 const char *subnode = dt_params[i].subnode;
688 if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
689 info->missing = dt_params[i].params[0].name;
694 int err = of_get_flat_dt_subnode_by_name(node, subnode);
702 return __find_uefi_params(node, info, dt_params[i].params);
708 int __init efi_get_fdt_params(struct efi_fdt_params *params)
710 struct param_info info;
713 pr_info("Getting EFI parameters from FDT:\n");
716 info.params = params;
718 ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
720 pr_info("UEFI not found.\n");
722 pr_err("Can't find '%s' in device tree!\n",
727 #endif /* CONFIG_EFI_PARAMS_FROM_FDT */
729 static __initdata char memory_type_name[][20] = {
737 "Conventional Memory",
739 "ACPI Reclaim Memory",
747 char * __init efi_md_typeattr_format(char *buf, size_t size,
748 const efi_memory_desc_t *md)
755 if (md->type >= ARRAY_SIZE(memory_type_name))
756 type_len = snprintf(pos, size, "[type=%u", md->type);
758 type_len = snprintf(pos, size, "[%-*s",
759 (int)(sizeof(memory_type_name[0]) - 1),
760 memory_type_name[md->type]);
761 if (type_len >= size)
767 attr = md->attribute;
768 if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
769 EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
770 EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
772 EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
773 snprintf(pos, size, "|attr=0x%016llx]",
774 (unsigned long long)attr);
777 "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
778 attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
779 attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
780 attr & EFI_MEMORY_NV ? "NV" : "",
781 attr & EFI_MEMORY_XP ? "XP" : "",
782 attr & EFI_MEMORY_RP ? "RP" : "",
783 attr & EFI_MEMORY_WP ? "WP" : "",
784 attr & EFI_MEMORY_RO ? "RO" : "",
785 attr & EFI_MEMORY_UCE ? "UCE" : "",
786 attr & EFI_MEMORY_WB ? "WB" : "",
787 attr & EFI_MEMORY_WT ? "WT" : "",
788 attr & EFI_MEMORY_WC ? "WC" : "",
789 attr & EFI_MEMORY_UC ? "UC" : "");
794 * efi_mem_attributes - lookup memmap attributes for physical address
795 * @phys_addr: the physical address to lookup
797 * Search in the EFI memory map for the region covering
798 * @phys_addr. Returns the EFI memory attributes if the region
799 * was found in the memory map, 0 otherwise.
801 * Despite being marked __weak, most architectures should *not*
802 * override this function. It is __weak solely for the benefit
803 * of ia64 which has a funky EFI memory map that doesn't work
804 * the same way as other architectures.
806 u64 __weak efi_mem_attributes(unsigned long phys_addr)
808 efi_memory_desc_t *md;
810 if (!efi_enabled(EFI_MEMMAP))
813 for_each_efi_memory_desc(md) {
814 if ((md->phys_addr <= phys_addr) &&
815 (phys_addr < (md->phys_addr +
816 (md->num_pages << EFI_PAGE_SHIFT))))
817 return md->attribute;
822 int efi_status_to_err(efi_status_t status)
830 case EFI_INVALID_PARAMETER:
833 case EFI_OUT_OF_RESOURCES:
836 case EFI_DEVICE_ERROR:
839 case EFI_WRITE_PROTECTED:
842 case EFI_SECURITY_VIOLATION:
859 static int update_efi_random_seed(struct notifier_block *nb,
860 unsigned long code, void *unused)
862 struct linux_efi_random_seed *seed;
865 if (!kexec_in_progress)
868 seed = memremap(efi.rng_seed, sizeof(*seed), MEMREMAP_WB);
870 size = min(seed->size, 32U);
873 pr_err("Could not map UEFI random seed!\n");
876 seed = memremap(efi.rng_seed, sizeof(*seed) + size,
880 get_random_bytes(seed->bits, seed->size);
883 pr_err("Could not map UEFI random seed!\n");
889 static struct notifier_block efi_random_seed_nb = {
890 .notifier_call = update_efi_random_seed,
893 static int register_update_efi_random_seed(void)
895 if (efi.rng_seed == EFI_INVALID_TABLE_ADDR)
897 return register_reboot_notifier(&efi_random_seed_nb);
899 late_initcall(register_update_efi_random_seed);