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,
55 .tpm_log = EFI_INVALID_TABLE_ADDR
59 static unsigned long *efi_tables[] = {
74 &efi.properties_table,
78 struct mm_struct efi_mm = {
80 .mm_users = ATOMIC_INIT(2),
81 .mm_count = ATOMIC_INIT(1),
82 .mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem),
83 .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
84 .mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
85 .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},
88 struct workqueue_struct *efi_rts_wq;
90 static bool disable_runtime;
91 static int __init setup_noefi(char *arg)
93 disable_runtime = true;
96 early_param("noefi", setup_noefi);
98 bool efi_runtime_disabled(void)
100 return disable_runtime;
103 static int __init parse_efi_cmdline(char *str)
106 pr_warn("need at least one option\n");
110 if (parse_option_str(str, "debug"))
111 set_bit(EFI_DBG, &efi.flags);
113 if (parse_option_str(str, "noruntime"))
114 disable_runtime = true;
118 early_param("efi", parse_efi_cmdline);
120 struct kobject *efi_kobj;
123 * Let's not leave out systab information that snuck into
125 * Note, do not add more fields in systab sysfs file as it breaks sysfs
126 * one value per file rule!
128 static ssize_t systab_show(struct kobject *kobj,
129 struct kobj_attribute *attr, char *buf)
136 if (efi.mps != EFI_INVALID_TABLE_ADDR)
137 str += sprintf(str, "MPS=0x%lx\n", efi.mps);
138 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
139 str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
140 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
141 str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
143 * If both SMBIOS and SMBIOS3 entry points are implemented, the
144 * SMBIOS3 entry point shall be preferred, so we list it first to
145 * let applications stop parsing after the first match.
147 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
148 str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
149 if (efi.smbios != EFI_INVALID_TABLE_ADDR)
150 str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
151 if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
152 str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
153 if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
154 str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
155 if (efi.uga != EFI_INVALID_TABLE_ADDR)
156 str += sprintf(str, "UGA=0x%lx\n", efi.uga);
161 static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
163 #define EFI_FIELD(var) efi.var
165 #define EFI_ATTR_SHOW(name) \
166 static ssize_t name##_show(struct kobject *kobj, \
167 struct kobj_attribute *attr, char *buf) \
169 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
172 EFI_ATTR_SHOW(fw_vendor);
173 EFI_ATTR_SHOW(runtime);
174 EFI_ATTR_SHOW(config_table);
176 static ssize_t fw_platform_size_show(struct kobject *kobj,
177 struct kobj_attribute *attr, char *buf)
179 return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
182 static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
183 static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
184 static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
185 static struct kobj_attribute efi_attr_fw_platform_size =
186 __ATTR_RO(fw_platform_size);
188 static struct attribute *efi_subsys_attrs[] = {
189 &efi_attr_systab.attr,
190 &efi_attr_fw_vendor.attr,
191 &efi_attr_runtime.attr,
192 &efi_attr_config_table.attr,
193 &efi_attr_fw_platform_size.attr,
197 static umode_t efi_attr_is_visible(struct kobject *kobj,
198 struct attribute *attr, int n)
200 if (attr == &efi_attr_fw_vendor.attr) {
201 if (efi_enabled(EFI_PARAVIRT) ||
202 efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
204 } else if (attr == &efi_attr_runtime.attr) {
205 if (efi.runtime == EFI_INVALID_TABLE_ADDR)
207 } else if (attr == &efi_attr_config_table.attr) {
208 if (efi.config_table == EFI_INVALID_TABLE_ADDR)
215 static const struct attribute_group efi_subsys_attr_group = {
216 .attrs = efi_subsys_attrs,
217 .is_visible = efi_attr_is_visible,
220 static struct efivars generic_efivars;
221 static struct efivar_operations generic_ops;
223 static int generic_ops_register(void)
225 generic_ops.get_variable = efi.get_variable;
226 generic_ops.set_variable = efi.set_variable;
227 generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
228 generic_ops.get_next_variable = efi.get_next_variable;
229 generic_ops.query_variable_store = efi_query_variable_store;
231 return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
234 static void generic_ops_unregister(void)
236 efivars_unregister(&generic_efivars);
239 #ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
240 #define EFIVAR_SSDT_NAME_MAX 16
241 static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
242 static int __init efivar_ssdt_setup(char *str)
244 if (strlen(str) < sizeof(efivar_ssdt))
245 memcpy(efivar_ssdt, str, strlen(str));
247 pr_warn("efivar_ssdt: name too long: %s\n", str);
250 __setup("efivar_ssdt=", efivar_ssdt_setup);
252 static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
253 unsigned long name_size, void *data)
255 struct efivar_entry *entry;
256 struct list_head *list = data;
257 char utf8_name[EFIVAR_SSDT_NAME_MAX];
258 int limit = min_t(unsigned long, EFIVAR_SSDT_NAME_MAX, name_size);
260 ucs2_as_utf8(utf8_name, name, limit - 1);
261 if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
264 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
268 memcpy(entry->var.VariableName, name, name_size);
269 memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
271 efivar_entry_add(entry, list);
276 static __init int efivar_ssdt_load(void)
279 struct efivar_entry *entry, *aux;
287 ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
289 list_for_each_entry_safe(entry, aux, &entries, list) {
290 pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
291 &entry->var.VendorGuid);
293 list_del(&entry->list);
295 ret = efivar_entry_size(entry, &size);
297 pr_err("failed to get var size\n");
301 data = kmalloc(size, GFP_KERNEL);
307 ret = efivar_entry_get(entry, NULL, &size, data);
309 pr_err("failed to get var data\n");
313 ret = acpi_load_table(data);
315 pr_err("failed to load table: %d\n", ret);
331 static inline int efivar_ssdt_load(void) { return 0; }
335 * We register the efi subsystem with the firmware subsystem and the
336 * efivars subsystem with the efi subsystem, if the system was booted with
339 static int __init efisubsys_init(void)
343 if (!efi_enabled(EFI_BOOT))
347 * Since we process only one efi_runtime_service() at a time, an
348 * ordered workqueue (which creates only one execution context)
349 * should suffice all our needs.
351 efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0);
353 pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
354 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
358 /* We register the efi directory at /sys/firmware/efi */
359 efi_kobj = kobject_create_and_add("efi", firmware_kobj);
361 pr_err("efi: Firmware registration failed.\n");
362 destroy_workqueue(efi_rts_wq);
366 error = generic_ops_register();
370 if (efi_enabled(EFI_RUNTIME_SERVICES))
373 error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
375 pr_err("efi: Sysfs attribute export failed with error %d.\n",
380 error = efi_runtime_map_init(efi_kobj);
382 goto err_remove_group;
384 /* and the standard mountpoint for efivarfs */
385 error = sysfs_create_mount_point(efi_kobj, "efivars");
387 pr_err("efivars: Subsystem registration failed.\n");
388 goto err_remove_group;
394 sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
396 generic_ops_unregister();
398 kobject_put(efi_kobj);
399 destroy_workqueue(efi_rts_wq);
403 subsys_initcall(efisubsys_init);
406 * Find the efi memory descriptor for a given physical address. Given a
407 * physical address, determine if it exists within an EFI Memory Map entry,
408 * and if so, populate the supplied memory descriptor with the appropriate
411 int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
413 efi_memory_desc_t *md;
415 if (!efi_enabled(EFI_MEMMAP)) {
416 pr_err_once("EFI_MEMMAP is not enabled.\n");
421 pr_err_once("out_md is null.\n");
425 for_each_efi_memory_desc(md) {
429 size = md->num_pages << EFI_PAGE_SHIFT;
430 end = md->phys_addr + size;
431 if (phys_addr >= md->phys_addr && phys_addr < end) {
432 memcpy(out_md, md, sizeof(*out_md));
440 * Calculate the highest address of an efi memory descriptor.
442 u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
444 u64 size = md->num_pages << EFI_PAGE_SHIFT;
445 u64 end = md->phys_addr + size;
449 void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
452 * efi_mem_reserve - Reserve an EFI memory region
453 * @addr: Physical address to reserve
454 * @size: Size of reservation
456 * Mark a region as reserved from general kernel allocation and
457 * prevent it being released by efi_free_boot_services().
459 * This function should be called drivers once they've parsed EFI
460 * configuration tables to figure out where their data lives, e.g.
463 void __init efi_mem_reserve(phys_addr_t addr, u64 size)
465 if (!memblock_is_region_reserved(addr, size))
466 memblock_reserve(addr, size);
469 * Some architectures (x86) reserve all boot services ranges
470 * until efi_free_boot_services() because of buggy firmware
471 * implementations. This means the above memblock_reserve() is
472 * superfluous on x86 and instead what it needs to do is
473 * ensure the @start, @size is not freed.
475 efi_arch_mem_reserve(addr, size);
478 static __initdata efi_config_table_type_t common_tables[] = {
479 {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
480 {ACPI_TABLE_GUID, "ACPI", &efi.acpi},
481 {HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
482 {MPS_TABLE_GUID, "MPS", &efi.mps},
483 {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
484 {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
485 {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
486 {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
487 {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
488 {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
489 {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
490 {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed},
491 {LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log},
492 {NULL_GUID, NULL, NULL},
495 static __init int match_config_table(efi_guid_t *guid,
497 efi_config_table_type_t *table_types)
502 for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
503 if (!efi_guidcmp(*guid, table_types[i].guid)) {
504 *(table_types[i].ptr) = table;
505 if (table_types[i].name)
506 pr_cont(" %s=0x%lx ",
507 table_types[i].name, table);
516 int __init efi_config_parse_tables(void *config_tables, int count, int sz,
517 efi_config_table_type_t *arch_tables)
522 tablep = config_tables;
524 for (i = 0; i < count; i++) {
528 if (efi_enabled(EFI_64BIT)) {
530 guid = ((efi_config_table_64_t *)tablep)->guid;
531 table64 = ((efi_config_table_64_t *)tablep)->table;
536 pr_err("Table located above 4GB, disabling EFI.\n");
541 guid = ((efi_config_table_32_t *)tablep)->guid;
542 table = ((efi_config_table_32_t *)tablep)->table;
545 if (!match_config_table(&guid, table, common_tables))
546 match_config_table(&guid, table, arch_tables);
551 set_bit(EFI_CONFIG_TABLES, &efi.flags);
553 if (efi.rng_seed != EFI_INVALID_TABLE_ADDR) {
554 struct linux_efi_random_seed *seed;
557 seed = early_memremap(efi.rng_seed, sizeof(*seed));
560 early_memunmap(seed, sizeof(*seed));
562 pr_err("Could not map UEFI random seed!\n");
565 seed = early_memremap(efi.rng_seed,
566 sizeof(*seed) + size);
568 pr_notice("seeding entropy pool\n");
569 add_device_randomness(seed->bits, seed->size);
570 early_memunmap(seed, sizeof(*seed) + size);
572 pr_err("Could not map UEFI random seed!\n");
577 if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP))
580 efi_tpm_eventlog_init();
582 /* Parse the EFI Properties table if it exists */
583 if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
584 efi_properties_table_t *tbl;
586 tbl = early_memremap(efi.properties_table, sizeof(*tbl));
588 pr_err("Could not map Properties table!\n");
592 if (tbl->memory_protection_attribute &
593 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
594 set_bit(EFI_NX_PE_DATA, &efi.flags);
596 early_memunmap(tbl, sizeof(*tbl));
602 int __init efi_config_init(efi_config_table_type_t *arch_tables)
607 if (efi_enabled(EFI_64BIT))
608 sz = sizeof(efi_config_table_64_t);
610 sz = sizeof(efi_config_table_32_t);
613 * Let's see what config tables the firmware passed to us.
615 config_tables = early_memremap(efi.systab->tables,
616 efi.systab->nr_tables * sz);
617 if (config_tables == NULL) {
618 pr_err("Could not map Configuration table!\n");
622 ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
625 early_memunmap(config_tables, efi.systab->nr_tables * sz);
629 #ifdef CONFIG_EFI_VARS_MODULE
630 static int __init efi_load_efivars(void)
632 struct platform_device *pdev;
634 if (!efi_enabled(EFI_RUNTIME_SERVICES))
637 pdev = platform_device_register_simple("efivars", 0, NULL, 0);
638 return PTR_ERR_OR_ZERO(pdev);
640 device_initcall(efi_load_efivars);
643 #ifdef CONFIG_EFI_PARAMS_FROM_FDT
645 #define UEFI_PARAM(name, prop, field) \
649 offsetof(struct efi_fdt_params, field), \
650 FIELD_SIZEOF(struct efi_fdt_params, field) \
655 const char propname[32];
660 static __initdata struct params fdt_params[] = {
661 UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
662 UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
663 UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
664 UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
665 UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
668 static __initdata struct params xen_fdt_params[] = {
669 UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
670 UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
671 UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
672 UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
673 UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
676 #define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
678 static __initdata struct {
681 struct params *params;
683 { "hypervisor", "uefi", xen_fdt_params },
684 { "chosen", NULL, fdt_params },
693 static int __init __find_uefi_params(unsigned long node,
694 struct param_info *info,
695 struct params *params)
702 for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
703 prop = of_get_flat_dt_prop(node, params[i].propname, &len);
705 info->missing = params[i].name;
709 dest = info->params + params[i].offset;
712 val = of_read_number(prop, len / sizeof(u32));
714 if (params[i].size == sizeof(u32))
719 if (efi_enabled(EFI_DBG))
720 pr_info(" %s: 0x%0*llx\n", params[i].name,
721 params[i].size * 2, val);
727 static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
728 int depth, void *data)
730 struct param_info *info = data;
733 for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
734 const char *subnode = dt_params[i].subnode;
736 if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
737 info->missing = dt_params[i].params[0].name;
742 int err = of_get_flat_dt_subnode_by_name(node, subnode);
750 return __find_uefi_params(node, info, dt_params[i].params);
756 int __init efi_get_fdt_params(struct efi_fdt_params *params)
758 struct param_info info;
761 pr_info("Getting EFI parameters from FDT:\n");
764 info.params = params;
766 ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
768 pr_info("UEFI not found.\n");
770 pr_err("Can't find '%s' in device tree!\n",
775 #endif /* CONFIG_EFI_PARAMS_FROM_FDT */
777 static __initdata char memory_type_name[][20] = {
785 "Conventional Memory",
787 "ACPI Reclaim Memory",
795 char * __init efi_md_typeattr_format(char *buf, size_t size,
796 const efi_memory_desc_t *md)
803 if (md->type >= ARRAY_SIZE(memory_type_name))
804 type_len = snprintf(pos, size, "[type=%u", md->type);
806 type_len = snprintf(pos, size, "[%-*s",
807 (int)(sizeof(memory_type_name[0]) - 1),
808 memory_type_name[md->type]);
809 if (type_len >= size)
815 attr = md->attribute;
816 if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
817 EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
818 EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
820 EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
821 snprintf(pos, size, "|attr=0x%016llx]",
822 (unsigned long long)attr);
825 "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
826 attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
827 attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
828 attr & EFI_MEMORY_NV ? "NV" : "",
829 attr & EFI_MEMORY_XP ? "XP" : "",
830 attr & EFI_MEMORY_RP ? "RP" : "",
831 attr & EFI_MEMORY_WP ? "WP" : "",
832 attr & EFI_MEMORY_RO ? "RO" : "",
833 attr & EFI_MEMORY_UCE ? "UCE" : "",
834 attr & EFI_MEMORY_WB ? "WB" : "",
835 attr & EFI_MEMORY_WT ? "WT" : "",
836 attr & EFI_MEMORY_WC ? "WC" : "",
837 attr & EFI_MEMORY_UC ? "UC" : "");
842 * IA64 has a funky EFI memory map that doesn't work the same way as
843 * other architectures.
847 * efi_mem_attributes - lookup memmap attributes for physical address
848 * @phys_addr: the physical address to lookup
850 * Search in the EFI memory map for the region covering
851 * @phys_addr. Returns the EFI memory attributes if the region
852 * was found in the memory map, 0 otherwise.
854 u64 efi_mem_attributes(unsigned long phys_addr)
856 efi_memory_desc_t *md;
858 if (!efi_enabled(EFI_MEMMAP))
861 for_each_efi_memory_desc(md) {
862 if ((md->phys_addr <= phys_addr) &&
863 (phys_addr < (md->phys_addr +
864 (md->num_pages << EFI_PAGE_SHIFT))))
865 return md->attribute;
871 * efi_mem_type - lookup memmap type for physical address
872 * @phys_addr: the physical address to lookup
874 * Search in the EFI memory map for the region covering @phys_addr.
875 * Returns the EFI memory type if the region was found in the memory
876 * map, EFI_RESERVED_TYPE (zero) otherwise.
878 int efi_mem_type(unsigned long phys_addr)
880 const efi_memory_desc_t *md;
882 if (!efi_enabled(EFI_MEMMAP))
885 for_each_efi_memory_desc(md) {
886 if ((md->phys_addr <= phys_addr) &&
887 (phys_addr < (md->phys_addr +
888 (md->num_pages << EFI_PAGE_SHIFT))))
895 int efi_status_to_err(efi_status_t status)
903 case EFI_INVALID_PARAMETER:
906 case EFI_OUT_OF_RESOURCES:
909 case EFI_DEVICE_ERROR:
912 case EFI_WRITE_PROTECTED:
915 case EFI_SECURITY_VIOLATION:
931 bool efi_is_table_address(unsigned long phys_addr)
935 if (phys_addr == EFI_INVALID_TABLE_ADDR)
938 for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
939 if (*(efi_tables[i]) == phys_addr)
946 static int update_efi_random_seed(struct notifier_block *nb,
947 unsigned long code, void *unused)
949 struct linux_efi_random_seed *seed;
952 if (!kexec_in_progress)
955 seed = memremap(efi.rng_seed, sizeof(*seed), MEMREMAP_WB);
957 size = min(seed->size, EFI_RANDOM_SEED_SIZE);
960 pr_err("Could not map UEFI random seed!\n");
963 seed = memremap(efi.rng_seed, sizeof(*seed) + size,
967 get_random_bytes(seed->bits, seed->size);
970 pr_err("Could not map UEFI random seed!\n");
976 static struct notifier_block efi_random_seed_nb = {
977 .notifier_call = update_efi_random_seed,
980 static int register_update_efi_random_seed(void)
982 if (efi.rng_seed == EFI_INVALID_TABLE_ADDR)
984 return register_reboot_notifier(&efi_random_seed_nb);
986 late_initcall(register_update_efi_random_seed);