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15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
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>
23#include <linux/of.h>
24#include <linux/of_fdt.h>
25#include <linux/io.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>
34
35#include <asm/early_ioremap.h>
36
37struct 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};
56EXPORT_SYMBOL(efi);
57
58static bool disable_runtime;
59static int __init setup_noefi(char *arg)
60{
61 disable_runtime = true;
62 return 0;
63}
64early_param("noefi", setup_noefi);
65
66bool efi_runtime_disabled(void)
67{
68 return disable_runtime;
69}
70
71static int __init parse_efi_cmdline(char *str)
72{
73 if (!str) {
74 pr_warn("need at least one option\n");
75 return -EINVAL;
76 }
77
78 if (parse_option_str(str, "debug"))
79 set_bit(EFI_DBG, &efi.flags);
80
81 if (parse_option_str(str, "noruntime"))
82 disable_runtime = true;
83
84 return 0;
85}
86early_param("efi", parse_efi_cmdline);
87
88struct kobject *efi_kobj;
89
90
91
92
93
94static ssize_t systab_show(struct kobject *kobj,
95 struct kobj_attribute *attr, char *buf)
96{
97 char *str = buf;
98
99 if (!kobj || !buf)
100 return -EINVAL;
101
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);
108
109
110
111
112
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);
123
124 return str - buf;
125}
126
127static struct kobj_attribute efi_attr_systab =
128 __ATTR(systab, 0400, systab_show, NULL);
129
130#define EFI_FIELD(var) efi.var
131
132#define EFI_ATTR_SHOW(name) \
133static ssize_t name##_show(struct kobject *kobj, \
134 struct kobj_attribute *attr, char *buf) \
135{ \
136 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
137}
138
139EFI_ATTR_SHOW(fw_vendor);
140EFI_ATTR_SHOW(runtime);
141EFI_ATTR_SHOW(config_table);
142
143static ssize_t fw_platform_size_show(struct kobject *kobj,
144 struct kobj_attribute *attr, char *buf)
145{
146 return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
147}
148
149static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
150static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
151static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
152static struct kobj_attribute efi_attr_fw_platform_size =
153 __ATTR_RO(fw_platform_size);
154
155static 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,
161 NULL,
162};
163
164static umode_t efi_attr_is_visible(struct kobject *kobj,
165 struct attribute *attr, int n)
166{
167 if (attr == &efi_attr_fw_vendor.attr) {
168 if (efi_enabled(EFI_PARAVIRT) ||
169 efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
170 return 0;
171 } else if (attr == &efi_attr_runtime.attr) {
172 if (efi.runtime == EFI_INVALID_TABLE_ADDR)
173 return 0;
174 } else if (attr == &efi_attr_config_table.attr) {
175 if (efi.config_table == EFI_INVALID_TABLE_ADDR)
176 return 0;
177 }
178
179 return attr->mode;
180}
181
182static struct attribute_group efi_subsys_attr_group = {
183 .attrs = efi_subsys_attrs,
184 .is_visible = efi_attr_is_visible,
185};
186
187static struct efivars generic_efivars;
188static struct efivar_operations generic_ops;
189
190static int generic_ops_register(void)
191{
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;
197
198 return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
199}
200
201static void generic_ops_unregister(void)
202{
203 efivars_unregister(&generic_efivars);
204}
205
206#if IS_ENABLED(CONFIG_ACPI)
207#define EFIVAR_SSDT_NAME_MAX 16
208static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
209static int __init efivar_ssdt_setup(char *str)
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 0;
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 ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
252
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);
256
257 list_del(&entry->list);
258
259 ret = efivar_entry_size(entry, &size);
260 if (ret) {
261 pr_err("failed to get var size\n");
262 goto free_entry;
263 }
264
265 data = kmalloc(size, GFP_KERNEL);
266 if (!data) {
267 ret = -ENOMEM;
268 goto free_entry;
269 }
270
271 ret = efivar_entry_get(entry, NULL, &size, data);
272 if (ret) {
273 pr_err("failed to get var data\n");
274 goto free_data;
275 }
276
277 ret = acpi_load_table(data);
278 if (ret) {
279 pr_err("failed to load table: %d\n", ret);
280 goto free_data;
281 }
282
283 goto free_entry;
284
285free_data:
286 kfree(data);
287
288free_entry:
289 kfree(entry);
290 }
291
292 return ret;
293}
294#else
295static inline int efivar_ssdt_load(void) { return 0; }
296#endif
297
298
299
300
301
302
303static int __init efisubsys_init(void)
304{
305 int error;
306
307 if (!efi_enabled(EFI_BOOT))
308 return 0;
309
310
311 efi_kobj = kobject_create_and_add("efi", firmware_kobj);
312 if (!efi_kobj) {
313 pr_err("efi: Firmware registration failed.\n");
314 return -ENOMEM;
315 }
316
317 error = generic_ops_register();
318 if (error)
319 goto err_put;
320
321 if (efi_enabled(EFI_RUNTIME_SERVICES))
322 efivar_ssdt_load();
323
324 error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
325 if (error) {
326 pr_err("efi: Sysfs attribute export failed with error %d.\n",
327 error);
328 goto err_unregister;
329 }
330
331 error = efi_runtime_map_init(efi_kobj);
332 if (error)
333 goto err_remove_group;
334
335
336 error = sysfs_create_mount_point(efi_kobj, "efivars");
337 if (error) {
338 pr_err("efivars: Subsystem registration failed.\n");
339 goto err_remove_group;
340 }
341
342 return 0;
343
344err_remove_group:
345 sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
346err_unregister:
347 generic_ops_unregister();
348err_put:
349 kobject_put(efi_kobj);
350 return error;
351}
352
353subsys_initcall(efisubsys_init);
354
355
356
357
358
359
360
361int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
362{
363 efi_memory_desc_t *md;
364
365 if (!efi_enabled(EFI_MEMMAP)) {
366 pr_err_once("EFI_MEMMAP is not enabled.\n");
367 return -EINVAL;
368 }
369
370 if (!out_md) {
371 pr_err_once("out_md is null.\n");
372 return -EINVAL;
373 }
374
375 for_each_efi_memory_desc(md) {
376 u64 size;
377 u64 end;
378
379 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
380 md->type != EFI_BOOT_SERVICES_DATA &&
381 md->type != EFI_RUNTIME_SERVICES_DATA) {
382 continue;
383 }
384
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));
389 return 0;
390 }
391 }
392 return -ENOENT;
393}
394
395
396
397
398u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
399{
400 u64 size = md->num_pages << EFI_PAGE_SHIFT;
401 u64 end = md->phys_addr + size;
402 return end;
403}
404
405void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
406
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417
418
419void __init efi_mem_reserve(phys_addr_t addr, u64 size)
420{
421 if (!memblock_is_region_reserved(addr, size))
422 memblock_reserve(addr, size);
423
424
425
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427
428
429
430
431 efi_arch_mem_reserve(addr, size);
432}
433
434static __initdata efi_config_table_type_t common_tables[] = {
435 {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
436 {ACPI_TABLE_GUID, "ACPI", &efi.acpi},
437 {HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
438 {MPS_TABLE_GUID, "MPS", &efi.mps},
439 {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
440 {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
441 {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
442 {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
443 {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
444 {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
445 {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
446 {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed},
447 {NULL_GUID, NULL, NULL},
448};
449
450static __init int match_config_table(efi_guid_t *guid,
451 unsigned long table,
452 efi_config_table_type_t *table_types)
453{
454 int i;
455
456 if (table_types) {
457 for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
458 if (!efi_guidcmp(*guid, table_types[i].guid)) {
459 *(table_types[i].ptr) = table;
460 if (table_types[i].name)
461 pr_cont(" %s=0x%lx ",
462 table_types[i].name, table);
463 return 1;
464 }
465 }
466 }
467
468 return 0;
469}
470
471int __init efi_config_parse_tables(void *config_tables, int count, int sz,
472 efi_config_table_type_t *arch_tables)
473{
474 void *tablep;
475 int i;
476
477 tablep = config_tables;
478 pr_info("");
479 for (i = 0; i < count; i++) {
480 efi_guid_t guid;
481 unsigned long table;
482
483 if (efi_enabled(EFI_64BIT)) {
484 u64 table64;
485 guid = ((efi_config_table_64_t *)tablep)->guid;
486 table64 = ((efi_config_table_64_t *)tablep)->table;
487 table = table64;
488#ifndef CONFIG_64BIT
489 if (table64 >> 32) {
490 pr_cont("\n");
491 pr_err("Table located above 4GB, disabling EFI.\n");
492 return -EINVAL;
493 }
494#endif
495 } else {
496 guid = ((efi_config_table_32_t *)tablep)->guid;
497 table = ((efi_config_table_32_t *)tablep)->table;
498 }
499
500 if (!match_config_table(&guid, table, common_tables))
501 match_config_table(&guid, table, arch_tables);
502
503 tablep += sz;
504 }
505 pr_cont("\n");
506 set_bit(EFI_CONFIG_TABLES, &efi.flags);
507
508 if (efi.rng_seed != EFI_INVALID_TABLE_ADDR) {
509 struct linux_efi_random_seed *seed;
510 u32 size = 0;
511
512 seed = early_memremap(efi.rng_seed, sizeof(*seed));
513 if (seed != NULL) {
514 size = seed->size;
515 early_memunmap(seed, sizeof(*seed));
516 } else {
517 pr_err("Could not map UEFI random seed!\n");
518 }
519 if (size > 0) {
520 seed = early_memremap(efi.rng_seed,
521 sizeof(*seed) + size);
522 if (seed != NULL) {
523 add_device_randomness(seed->bits, seed->size);
524 early_memunmap(seed, sizeof(*seed) + size);
525 } else {
526 pr_err("Could not map UEFI random seed!\n");
527 }
528 }
529 }
530
531 efi_memattr_init();
532
533
534 if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
535 efi_properties_table_t *tbl;
536
537 tbl = early_memremap(efi.properties_table, sizeof(*tbl));
538 if (tbl == NULL) {
539 pr_err("Could not map Properties table!\n");
540 return -ENOMEM;
541 }
542
543 if (tbl->memory_protection_attribute &
544 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
545 set_bit(EFI_NX_PE_DATA, &efi.flags);
546
547 early_memunmap(tbl, sizeof(*tbl));
548 }
549
550 return 0;
551}
552
553int __init efi_config_init(efi_config_table_type_t *arch_tables)
554{
555 void *config_tables;
556 int sz, ret;
557
558 if (efi_enabled(EFI_64BIT))
559 sz = sizeof(efi_config_table_64_t);
560 else
561 sz = sizeof(efi_config_table_32_t);
562
563
564
565
566 config_tables = early_memremap(efi.systab->tables,
567 efi.systab->nr_tables * sz);
568 if (config_tables == NULL) {
569 pr_err("Could not map Configuration table!\n");
570 return -ENOMEM;
571 }
572
573 ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
574 arch_tables);
575
576 early_memunmap(config_tables, efi.systab->nr_tables * sz);
577 return ret;
578}
579
580#ifdef CONFIG_EFI_VARS_MODULE
581static int __init efi_load_efivars(void)
582{
583 struct platform_device *pdev;
584
585 if (!efi_enabled(EFI_RUNTIME_SERVICES))
586 return 0;
587
588 pdev = platform_device_register_simple("efivars", 0, NULL, 0);
589 return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
590}
591device_initcall(efi_load_efivars);
592#endif
593
594#ifdef CONFIG_EFI_PARAMS_FROM_FDT
595
596#define UEFI_PARAM(name, prop, field) \
597 { \
598 { name }, \
599 { prop }, \
600 offsetof(struct efi_fdt_params, field), \
601 FIELD_SIZEOF(struct efi_fdt_params, field) \
602 }
603
604struct params {
605 const char name[32];
606 const char propname[32];
607 int offset;
608 int size;
609};
610
611static __initdata struct params fdt_params[] = {
612 UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
613 UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
614 UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
615 UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
616 UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
617};
618
619static __initdata struct params xen_fdt_params[] = {
620 UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
621 UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
622 UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
623 UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
624 UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
625};
626
627#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
628
629static __initdata struct {
630 const char *uname;
631 const char *subnode;
632 struct params *params;
633} dt_params[] = {
634 { "hypervisor", "uefi", xen_fdt_params },
635 { "chosen", NULL, fdt_params },
636};
637
638struct param_info {
639 int found;
640 void *params;
641 const char *missing;
642};
643
644static int __init __find_uefi_params(unsigned long node,
645 struct param_info *info,
646 struct params *params)
647{
648 const void *prop;
649 void *dest;
650 u64 val;
651 int i, len;
652
653 for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
654 prop = of_get_flat_dt_prop(node, params[i].propname, &len);
655 if (!prop) {
656 info->missing = params[i].name;
657 return 0;
658 }
659
660 dest = info->params + params[i].offset;
661 info->found++;
662
663 val = of_read_number(prop, len / sizeof(u32));
664
665 if (params[i].size == sizeof(u32))
666 *(u32 *)dest = val;
667 else
668 *(u64 *)dest = val;
669
670 if (efi_enabled(EFI_DBG))
671 pr_info(" %s: 0x%0*llx\n", params[i].name,
672 params[i].size * 2, val);
673 }
674
675 return 1;
676}
677
678static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
679 int depth, void *data)
680{
681 struct param_info *info = data;
682 int i;
683
684 for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
685 const char *subnode = dt_params[i].subnode;
686
687 if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
688 info->missing = dt_params[i].params[0].name;
689 continue;
690 }
691
692 if (subnode) {
693 int err = of_get_flat_dt_subnode_by_name(node, subnode);
694
695 if (err < 0)
696 return 0;
697
698 node = err;
699 }
700
701 return __find_uefi_params(node, info, dt_params[i].params);
702 }
703
704 return 0;
705}
706
707int __init efi_get_fdt_params(struct efi_fdt_params *params)
708{
709 struct param_info info;
710 int ret;
711
712 pr_info("Getting EFI parameters from FDT:\n");
713
714 info.found = 0;
715 info.params = params;
716
717 ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
718 if (!info.found)
719 pr_info("UEFI not found.\n");
720 else if (!ret)
721 pr_err("Can't find '%s' in device tree!\n",
722 info.missing);
723
724 return ret;
725}
726#endif
727
728static __initdata char memory_type_name[][20] = {
729 "Reserved",
730 "Loader Code",
731 "Loader Data",
732 "Boot Code",
733 "Boot Data",
734 "Runtime Code",
735 "Runtime Data",
736 "Conventional Memory",
737 "Unusable Memory",
738 "ACPI Reclaim Memory",
739 "ACPI Memory NVS",
740 "Memory Mapped I/O",
741 "MMIO Port Space",
742 "PAL Code",
743 "Persistent Memory",
744};
745
746char * __init efi_md_typeattr_format(char *buf, size_t size,
747 const efi_memory_desc_t *md)
748{
749 char *pos;
750 int type_len;
751 u64 attr;
752
753 pos = buf;
754 if (md->type >= ARRAY_SIZE(memory_type_name))
755 type_len = snprintf(pos, size, "[type=%u", md->type);
756 else
757 type_len = snprintf(pos, size, "[%-*s",
758 (int)(sizeof(memory_type_name[0]) - 1),
759 memory_type_name[md->type]);
760 if (type_len >= size)
761 return buf;
762
763 pos += type_len;
764 size -= type_len;
765
766 attr = md->attribute;
767 if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
768 EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
769 EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
770 EFI_MEMORY_NV |
771 EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
772 snprintf(pos, size, "|attr=0x%016llx]",
773 (unsigned long long)attr);
774 else
775 snprintf(pos, size,
776 "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
777 attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
778 attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
779 attr & EFI_MEMORY_NV ? "NV" : "",
780 attr & EFI_MEMORY_XP ? "XP" : "",
781 attr & EFI_MEMORY_RP ? "RP" : "",
782 attr & EFI_MEMORY_WP ? "WP" : "",
783 attr & EFI_MEMORY_RO ? "RO" : "",
784 attr & EFI_MEMORY_UCE ? "UCE" : "",
785 attr & EFI_MEMORY_WB ? "WB" : "",
786 attr & EFI_MEMORY_WT ? "WT" : "",
787 attr & EFI_MEMORY_WC ? "WC" : "",
788 attr & EFI_MEMORY_UC ? "UC" : "");
789 return buf;
790}
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805u64 __weak efi_mem_attributes(unsigned long phys_addr)
806{
807 efi_memory_desc_t *md;
808
809 if (!efi_enabled(EFI_MEMMAP))
810 return 0;
811
812 for_each_efi_memory_desc(md) {
813 if ((md->phys_addr <= phys_addr) &&
814 (phys_addr < (md->phys_addr +
815 (md->num_pages << EFI_PAGE_SHIFT))))
816 return md->attribute;
817 }
818 return 0;
819}
820
821int efi_status_to_err(efi_status_t status)
822{
823 int err;
824
825 switch (status) {
826 case EFI_SUCCESS:
827 err = 0;
828 break;
829 case EFI_INVALID_PARAMETER:
830 err = -EINVAL;
831 break;
832 case EFI_OUT_OF_RESOURCES:
833 err = -ENOSPC;
834 break;
835 case EFI_DEVICE_ERROR:
836 err = -EIO;
837 break;
838 case EFI_WRITE_PROTECTED:
839 err = -EROFS;
840 break;
841 case EFI_SECURITY_VIOLATION:
842 err = -EACCES;
843 break;
844 case EFI_NOT_FOUND:
845 err = -ENOENT;
846 break;
847 case EFI_ABORTED:
848 err = -EINTR;
849 break;
850 default:
851 err = -EINVAL;
852 }
853
854 return err;
855}
856
857#ifdef CONFIG_KEXEC
858static int update_efi_random_seed(struct notifier_block *nb,
859 unsigned long code, void *unused)
860{
861 struct linux_efi_random_seed *seed;
862 u32 size = 0;
863
864 if (!kexec_in_progress)
865 return NOTIFY_DONE;
866
867 seed = memremap(efi.rng_seed, sizeof(*seed), MEMREMAP_WB);
868 if (seed != NULL) {
869 size = min(seed->size, 32U);
870 memunmap(seed);
871 } else {
872 pr_err("Could not map UEFI random seed!\n");
873 }
874 if (size > 0) {
875 seed = memremap(efi.rng_seed, sizeof(*seed) + size,
876 MEMREMAP_WB);
877 if (seed != NULL) {
878 seed->size = size;
879 get_random_bytes(seed->bits, seed->size);
880 memunmap(seed);
881 } else {
882 pr_err("Could not map UEFI random seed!\n");
883 }
884 }
885 return NOTIFY_DONE;
886}
887
888static struct notifier_block efi_random_seed_nb = {
889 .notifier_call = update_efi_random_seed,
890};
891
892static int register_update_efi_random_seed(void)
893{
894 if (efi.rng_seed == EFI_INVALID_TABLE_ADDR)
895 return 0;
896 return register_reboot_notifier(&efi_random_seed_nb);
897}
898late_initcall(register_update_efi_random_seed);
899#endif
900
