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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 .tpm_log = EFI_INVALID_TABLE_ADDR
56};
57EXPORT_SYMBOL(efi);
58
59static unsigned long *efi_tables[] = {
60 &efi.mps,
61 &efi.acpi,
62 &efi.acpi20,
63 &efi.smbios,
64 &efi.smbios3,
65 &efi.sal_systab,
66 &efi.boot_info,
67 &efi.hcdp,
68 &efi.uga,
69 &efi.uv_systab,
70 &efi.fw_vendor,
71 &efi.runtime,
72 &efi.config_table,
73 &efi.esrt,
74 &efi.properties_table,
75 &efi.mem_attr_table,
76};
77
78struct mm_struct efi_mm = {
79 .mm_rb = RB_ROOT,
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},
86};
87
88struct workqueue_struct *efi_rts_wq;
89
90static bool disable_runtime;
91static int __init setup_noefi(char *arg)
92{
93 disable_runtime = true;
94 return 0;
95}
96early_param("noefi", setup_noefi);
97
98bool efi_runtime_disabled(void)
99{
100 return disable_runtime;
101}
102
103static int __init parse_efi_cmdline(char *str)
104{
105 if (!str) {
106 pr_warn("need at least one option\n");
107 return -EINVAL;
108 }
109
110 if (parse_option_str(str, "debug"))
111 set_bit(EFI_DBG, &efi.flags);
112
113 if (parse_option_str(str, "noruntime"))
114 disable_runtime = true;
115
116 return 0;
117}
118early_param("efi", parse_efi_cmdline);
119
120struct kobject *efi_kobj;
121
122
123
124
125
126
127
128static ssize_t systab_show(struct kobject *kobj,
129 struct kobj_attribute *attr, char *buf)
130{
131 char *str = buf;
132
133 if (!kobj || !buf)
134 return -EINVAL;
135
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);
142
143
144
145
146
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);
157
158 return str - buf;
159}
160
161static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
162
163#define EFI_FIELD(var) efi.var
164
165#define EFI_ATTR_SHOW(name) \
166static ssize_t name##_show(struct kobject *kobj, \
167 struct kobj_attribute *attr, char *buf) \
168{ \
169 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
170}
171
172EFI_ATTR_SHOW(fw_vendor);
173EFI_ATTR_SHOW(runtime);
174EFI_ATTR_SHOW(config_table);
175
176static ssize_t fw_platform_size_show(struct kobject *kobj,
177 struct kobj_attribute *attr, char *buf)
178{
179 return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
180}
181
182static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
183static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
184static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
185static struct kobj_attribute efi_attr_fw_platform_size =
186 __ATTR_RO(fw_platform_size);
187
188static 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,
194 NULL,
195};
196
197static umode_t efi_attr_is_visible(struct kobject *kobj,
198 struct attribute *attr, int n)
199{
200 if (attr == &efi_attr_fw_vendor.attr) {
201 if (efi_enabled(EFI_PARAVIRT) ||
202 efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
203 return 0;
204 } else if (attr == &efi_attr_runtime.attr) {
205 if (efi.runtime == EFI_INVALID_TABLE_ADDR)
206 return 0;
207 } else if (attr == &efi_attr_config_table.attr) {
208 if (efi.config_table == EFI_INVALID_TABLE_ADDR)
209 return 0;
210 }
211
212 return attr->mode;
213}
214
215static const struct attribute_group efi_subsys_attr_group = {
216 .attrs = efi_subsys_attrs,
217 .is_visible = efi_attr_is_visible,
218};
219
220static struct efivars generic_efivars;
221static struct efivar_operations generic_ops;
222
223static int generic_ops_register(void)
224{
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;
230
231 return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
232}
233
234static void generic_ops_unregister(void)
235{
236 efivars_unregister(&generic_efivars);
237}
238
239#if IS_ENABLED(CONFIG_ACPI)
240#define EFIVAR_SSDT_NAME_MAX 16
241static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
242static int __init efivar_ssdt_setup(char *str)
243{
244 if (strlen(str) < sizeof(efivar_ssdt))
245 memcpy(efivar_ssdt, str, strlen(str));
246 else
247 pr_warn("efivar_ssdt: name too long: %s\n", str);
248 return 0;
249}
250__setup("efivar_ssdt=", efivar_ssdt_setup);
251
252static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
253 unsigned long name_size, void *data)
254{
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);
259
260 ucs2_as_utf8(utf8_name, name, limit - 1);
261 if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
262 return 0;
263
264 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
265 if (!entry)
266 return 0;
267
268 memcpy(entry->var.VariableName, name, name_size);
269 memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
270
271 efivar_entry_add(entry, list);
272
273 return 0;
274}
275
276static __init int efivar_ssdt_load(void)
277{
278 LIST_HEAD(entries);
279 struct efivar_entry *entry, *aux;
280 unsigned long size;
281 void *data;
282 int ret;
283
284 ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
285
286 list_for_each_entry_safe(entry, aux, &entries, list) {
287 pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
288 &entry->var.VendorGuid);
289
290 list_del(&entry->list);
291
292 ret = efivar_entry_size(entry, &size);
293 if (ret) {
294 pr_err("failed to get var size\n");
295 goto free_entry;
296 }
297
298 data = kmalloc(size, GFP_KERNEL);
299 if (!data) {
300 ret = -ENOMEM;
301 goto free_entry;
302 }
303
304 ret = efivar_entry_get(entry, NULL, &size, data);
305 if (ret) {
306 pr_err("failed to get var data\n");
307 goto free_data;
308 }
309
310 ret = acpi_load_table(data);
311 if (ret) {
312 pr_err("failed to load table: %d\n", ret);
313 goto free_data;
314 }
315
316 goto free_entry;
317
318free_data:
319 kfree(data);
320
321free_entry:
322 kfree(entry);
323 }
324
325 return ret;
326}
327#else
328static inline int efivar_ssdt_load(void) { return 0; }
329#endif
330
331
332
333
334
335
336static int __init efisubsys_init(void)
337{
338 int error;
339
340 if (!efi_enabled(EFI_BOOT))
341 return 0;
342
343
344
345
346
347
348 efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0);
349 if (!efi_rts_wq) {
350 pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
351 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
352 return 0;
353 }
354
355
356 efi_kobj = kobject_create_and_add("efi", firmware_kobj);
357 if (!efi_kobj) {
358 pr_err("efi: Firmware registration failed.\n");
359 return -ENOMEM;
360 }
361
362 error = generic_ops_register();
363 if (error)
364 goto err_put;
365
366 if (efi_enabled(EFI_RUNTIME_SERVICES))
367 efivar_ssdt_load();
368
369 error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
370 if (error) {
371 pr_err("efi: Sysfs attribute export failed with error %d.\n",
372 error);
373 goto err_unregister;
374 }
375
376 error = efi_runtime_map_init(efi_kobj);
377 if (error)
378 goto err_remove_group;
379
380
381 error = sysfs_create_mount_point(efi_kobj, "efivars");
382 if (error) {
383 pr_err("efivars: Subsystem registration failed.\n");
384 goto err_remove_group;
385 }
386
387 return 0;
388
389err_remove_group:
390 sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
391err_unregister:
392 generic_ops_unregister();
393err_put:
394 kobject_put(efi_kobj);
395 return error;
396}
397
398subsys_initcall(efisubsys_init);
399
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401
402
403
404
405
406int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
407{
408 efi_memory_desc_t *md;
409
410 if (!efi_enabled(EFI_MEMMAP)) {
411 pr_err_once("EFI_MEMMAP is not enabled.\n");
412 return -EINVAL;
413 }
414
415 if (!out_md) {
416 pr_err_once("out_md is null.\n");
417 return -EINVAL;
418 }
419
420 for_each_efi_memory_desc(md) {
421 u64 size;
422 u64 end;
423
424 size = md->num_pages << EFI_PAGE_SHIFT;
425 end = md->phys_addr + size;
426 if (phys_addr >= md->phys_addr && phys_addr < end) {
427 memcpy(out_md, md, sizeof(*out_md));
428 return 0;
429 }
430 }
431 return -ENOENT;
432}
433
434
435
436
437u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
438{
439 u64 size = md->num_pages << EFI_PAGE_SHIFT;
440 u64 end = md->phys_addr + size;
441 return end;
442}
443
444void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
445
446
447
448
449
450
451
452
453
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455
456
457
458void __init efi_mem_reserve(phys_addr_t addr, u64 size)
459{
460 if (!memblock_is_region_reserved(addr, size))
461 memblock_reserve(addr, size);
462
463
464
465
466
467
468
469
470 efi_arch_mem_reserve(addr, size);
471}
472
473static __initdata efi_config_table_type_t common_tables[] = {
474 {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
475 {ACPI_TABLE_GUID, "ACPI", &efi.acpi},
476 {HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
477 {MPS_TABLE_GUID, "MPS", &efi.mps},
478 {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
479 {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
480 {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
481 {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
482 {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
483 {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
484 {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
485 {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed},
486 {LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log},
487 {NULL_GUID, NULL, NULL},
488};
489
490static __init int match_config_table(efi_guid_t *guid,
491 unsigned long table,
492 efi_config_table_type_t *table_types)
493{
494 int i;
495
496 if (table_types) {
497 for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
498 if (!efi_guidcmp(*guid, table_types[i].guid)) {
499 *(table_types[i].ptr) = table;
500 if (table_types[i].name)
501 pr_cont(" %s=0x%lx ",
502 table_types[i].name, table);
503 return 1;
504 }
505 }
506 }
507
508 return 0;
509}
510
511int __init efi_config_parse_tables(void *config_tables, int count, int sz,
512 efi_config_table_type_t *arch_tables)
513{
514 void *tablep;
515 int i;
516
517 tablep = config_tables;
518 pr_info("");
519 for (i = 0; i < count; i++) {
520 efi_guid_t guid;
521 unsigned long table;
522
523 if (efi_enabled(EFI_64BIT)) {
524 u64 table64;
525 guid = ((efi_config_table_64_t *)tablep)->guid;
526 table64 = ((efi_config_table_64_t *)tablep)->table;
527 table = table64;
528#ifndef CONFIG_64BIT
529 if (table64 >> 32) {
530 pr_cont("\n");
531 pr_err("Table located above 4GB, disabling EFI.\n");
532 return -EINVAL;
533 }
534#endif
535 } else {
536 guid = ((efi_config_table_32_t *)tablep)->guid;
537 table = ((efi_config_table_32_t *)tablep)->table;
538 }
539
540 if (!match_config_table(&guid, table, common_tables))
541 match_config_table(&guid, table, arch_tables);
542
543 tablep += sz;
544 }
545 pr_cont("\n");
546 set_bit(EFI_CONFIG_TABLES, &efi.flags);
547
548 if (efi.rng_seed != EFI_INVALID_TABLE_ADDR) {
549 struct linux_efi_random_seed *seed;
550 u32 size = 0;
551
552 seed = early_memremap(efi.rng_seed, sizeof(*seed));
553 if (seed != NULL) {
554 size = seed->size;
555 early_memunmap(seed, sizeof(*seed));
556 } else {
557 pr_err("Could not map UEFI random seed!\n");
558 }
559 if (size > 0) {
560 seed = early_memremap(efi.rng_seed,
561 sizeof(*seed) + size);
562 if (seed != NULL) {
563 pr_notice("seeding entropy pool\n");
564 add_device_randomness(seed->bits, seed->size);
565 early_memunmap(seed, sizeof(*seed) + size);
566 } else {
567 pr_err("Could not map UEFI random seed!\n");
568 }
569 }
570 }
571
572 if (efi_enabled(EFI_MEMMAP))
573 efi_memattr_init();
574
575 efi_tpm_eventlog_init();
576
577
578 if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
579 efi_properties_table_t *tbl;
580
581 tbl = early_memremap(efi.properties_table, sizeof(*tbl));
582 if (tbl == NULL) {
583 pr_err("Could not map Properties table!\n");
584 return -ENOMEM;
585 }
586
587 if (tbl->memory_protection_attribute &
588 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
589 set_bit(EFI_NX_PE_DATA, &efi.flags);
590
591 early_memunmap(tbl, sizeof(*tbl));
592 }
593
594 return 0;
595}
596
597int __init efi_config_init(efi_config_table_type_t *arch_tables)
598{
599 void *config_tables;
600 int sz, ret;
601
602 if (efi_enabled(EFI_64BIT))
603 sz = sizeof(efi_config_table_64_t);
604 else
605 sz = sizeof(efi_config_table_32_t);
606
607
608
609
610 config_tables = early_memremap(efi.systab->tables,
611 efi.systab->nr_tables * sz);
612 if (config_tables == NULL) {
613 pr_err("Could not map Configuration table!\n");
614 return -ENOMEM;
615 }
616
617 ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
618 arch_tables);
619
620 early_memunmap(config_tables, efi.systab->nr_tables * sz);
621 return ret;
622}
623
624#ifdef CONFIG_EFI_VARS_MODULE
625static int __init efi_load_efivars(void)
626{
627 struct platform_device *pdev;
628
629 if (!efi_enabled(EFI_RUNTIME_SERVICES))
630 return 0;
631
632 pdev = platform_device_register_simple("efivars", 0, NULL, 0);
633 return PTR_ERR_OR_ZERO(pdev);
634}
635device_initcall(efi_load_efivars);
636#endif
637
638#ifdef CONFIG_EFI_PARAMS_FROM_FDT
639
640#define UEFI_PARAM(name, prop, field) \
641 { \
642 { name }, \
643 { prop }, \
644 offsetof(struct efi_fdt_params, field), \
645 FIELD_SIZEOF(struct efi_fdt_params, field) \
646 }
647
648struct params {
649 const char name[32];
650 const char propname[32];
651 int offset;
652 int size;
653};
654
655static __initdata struct params fdt_params[] = {
656 UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
657 UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
658 UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
659 UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
660 UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
661};
662
663static __initdata struct params xen_fdt_params[] = {
664 UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
665 UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
666 UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
667 UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
668 UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
669};
670
671#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
672
673static __initdata struct {
674 const char *uname;
675 const char *subnode;
676 struct params *params;
677} dt_params[] = {
678 { "hypervisor", "uefi", xen_fdt_params },
679 { "chosen", NULL, fdt_params },
680};
681
682struct param_info {
683 int found;
684 void *params;
685 const char *missing;
686};
687
688static int __init __find_uefi_params(unsigned long node,
689 struct param_info *info,
690 struct params *params)
691{
692 const void *prop;
693 void *dest;
694 u64 val;
695 int i, len;
696
697 for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
698 prop = of_get_flat_dt_prop(node, params[i].propname, &len);
699 if (!prop) {
700 info->missing = params[i].name;
701 return 0;
702 }
703
704 dest = info->params + params[i].offset;
705 info->found++;
706
707 val = of_read_number(prop, len / sizeof(u32));
708
709 if (params[i].size == sizeof(u32))
710 *(u32 *)dest = val;
711 else
712 *(u64 *)dest = val;
713
714 if (efi_enabled(EFI_DBG))
715 pr_info(" %s: 0x%0*llx\n", params[i].name,
716 params[i].size * 2, val);
717 }
718
719 return 1;
720}
721
722static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
723 int depth, void *data)
724{
725 struct param_info *info = data;
726 int i;
727
728 for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
729 const char *subnode = dt_params[i].subnode;
730
731 if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
732 info->missing = dt_params[i].params[0].name;
733 continue;
734 }
735
736 if (subnode) {
737 int err = of_get_flat_dt_subnode_by_name(node, subnode);
738
739 if (err < 0)
740 return 0;
741
742 node = err;
743 }
744
745 return __find_uefi_params(node, info, dt_params[i].params);
746 }
747
748 return 0;
749}
750
751int __init efi_get_fdt_params(struct efi_fdt_params *params)
752{
753 struct param_info info;
754 int ret;
755
756 pr_info("Getting EFI parameters from FDT:\n");
757
758 info.found = 0;
759 info.params = params;
760
761 ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
762 if (!info.found)
763 pr_info("UEFI not found.\n");
764 else if (!ret)
765 pr_err("Can't find '%s' in device tree!\n",
766 info.missing);
767
768 return ret;
769}
770#endif
771
772static __initdata char memory_type_name[][20] = {
773 "Reserved",
774 "Loader Code",
775 "Loader Data",
776 "Boot Code",
777 "Boot Data",
778 "Runtime Code",
779 "Runtime Data",
780 "Conventional Memory",
781 "Unusable Memory",
782 "ACPI Reclaim Memory",
783 "ACPI Memory NVS",
784 "Memory Mapped I/O",
785 "MMIO Port Space",
786 "PAL Code",
787 "Persistent Memory",
788};
789
790char * __init efi_md_typeattr_format(char *buf, size_t size,
791 const efi_memory_desc_t *md)
792{
793 char *pos;
794 int type_len;
795 u64 attr;
796
797 pos = buf;
798 if (md->type >= ARRAY_SIZE(memory_type_name))
799 type_len = snprintf(pos, size, "[type=%u", md->type);
800 else
801 type_len = snprintf(pos, size, "[%-*s",
802 (int)(sizeof(memory_type_name[0]) - 1),
803 memory_type_name[md->type]);
804 if (type_len >= size)
805 return buf;
806
807 pos += type_len;
808 size -= type_len;
809
810 attr = md->attribute;
811 if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
812 EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
813 EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
814 EFI_MEMORY_NV |
815 EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
816 snprintf(pos, size, "|attr=0x%016llx]",
817 (unsigned long long)attr);
818 else
819 snprintf(pos, size,
820 "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
821 attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
822 attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
823 attr & EFI_MEMORY_NV ? "NV" : "",
824 attr & EFI_MEMORY_XP ? "XP" : "",
825 attr & EFI_MEMORY_RP ? "RP" : "",
826 attr & EFI_MEMORY_WP ? "WP" : "",
827 attr & EFI_MEMORY_RO ? "RO" : "",
828 attr & EFI_MEMORY_UCE ? "UCE" : "",
829 attr & EFI_MEMORY_WB ? "WB" : "",
830 attr & EFI_MEMORY_WT ? "WT" : "",
831 attr & EFI_MEMORY_WC ? "WC" : "",
832 attr & EFI_MEMORY_UC ? "UC" : "");
833 return buf;
834}
835
836
837
838
839
840#ifndef CONFIG_IA64
841
842
843
844
845
846
847
848
849u64 efi_mem_attributes(unsigned long phys_addr)
850{
851 efi_memory_desc_t *md;
852
853 if (!efi_enabled(EFI_MEMMAP))
854 return 0;
855
856 for_each_efi_memory_desc(md) {
857 if ((md->phys_addr <= phys_addr) &&
858 (phys_addr < (md->phys_addr +
859 (md->num_pages << EFI_PAGE_SHIFT))))
860 return md->attribute;
861 }
862 return 0;
863}
864
865
866
867
868
869
870
871
872
873int efi_mem_type(unsigned long phys_addr)
874{
875 const efi_memory_desc_t *md;
876
877 if (!efi_enabled(EFI_MEMMAP))
878 return -ENOTSUPP;
879
880 for_each_efi_memory_desc(md) {
881 if ((md->phys_addr <= phys_addr) &&
882 (phys_addr < (md->phys_addr +
883 (md->num_pages << EFI_PAGE_SHIFT))))
884 return md->type;
885 }
886 return -EINVAL;
887}
888#endif
889
890int efi_status_to_err(efi_status_t status)
891{
892 int err;
893
894 switch (status) {
895 case EFI_SUCCESS:
896 err = 0;
897 break;
898 case EFI_INVALID_PARAMETER:
899 err = -EINVAL;
900 break;
901 case EFI_OUT_OF_RESOURCES:
902 err = -ENOSPC;
903 break;
904 case EFI_DEVICE_ERROR:
905 err = -EIO;
906 break;
907 case EFI_WRITE_PROTECTED:
908 err = -EROFS;
909 break;
910 case EFI_SECURITY_VIOLATION:
911 err = -EACCES;
912 break;
913 case EFI_NOT_FOUND:
914 err = -ENOENT;
915 break;
916 case EFI_ABORTED:
917 err = -EINTR;
918 break;
919 default:
920 err = -EINVAL;
921 }
922
923 return err;
924}
925
926bool efi_is_table_address(unsigned long phys_addr)
927{
928 unsigned int i;
929
930 if (phys_addr == EFI_INVALID_TABLE_ADDR)
931 return false;
932
933 for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
934 if (*(efi_tables[i]) == phys_addr)
935 return true;
936
937 return false;
938}
939
940#ifdef CONFIG_KEXEC
941static int update_efi_random_seed(struct notifier_block *nb,
942 unsigned long code, void *unused)
943{
944 struct linux_efi_random_seed *seed;
945 u32 size = 0;
946
947 if (!kexec_in_progress)
948 return NOTIFY_DONE;
949
950 seed = memremap(efi.rng_seed, sizeof(*seed), MEMREMAP_WB);
951 if (seed != NULL) {
952 size = min(seed->size, EFI_RANDOM_SEED_SIZE);
953 memunmap(seed);
954 } else {
955 pr_err("Could not map UEFI random seed!\n");
956 }
957 if (size > 0) {
958 seed = memremap(efi.rng_seed, sizeof(*seed) + size,
959 MEMREMAP_WB);
960 if (seed != NULL) {
961 seed->size = size;
962 get_random_bytes(seed->bits, seed->size);
963 memunmap(seed);
964 } else {
965 pr_err("Could not map UEFI random seed!\n");
966 }
967 }
968 return NOTIFY_DONE;
969}
970
971static struct notifier_block efi_random_seed_nb = {
972 .notifier_call = update_efi_random_seed,
973};
974
975static int register_update_efi_random_seed(void)
976{
977 if (efi.rng_seed == EFI_INVALID_TABLE_ADDR)
978 return 0;
979 return register_reboot_notifier(&efi_random_seed_nb);
980}
981late_initcall(register_update_efi_random_seed);
982#endif
983
