1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * EFI application runtime services
4 *
5 * Copyright (c) 2016 Alexander Graf
6 */
7
8 #include <common.h>
9 #include <command.h>
10 #include <cpu_func.h>
11 #include <dm.h>
12 #include <elf.h>
13 #include <efi_loader.h>
14 #include <log.h>
15 #include <malloc.h>
16 #include <rtc.h>
17 #include <asm/global_data.h>
18 #include <u-boot/crc.h>
19
20 /* For manual relocation support */
21 DECLARE_GLOBAL_DATA_PTR;
22
23 /* GUID of the runtime properties table */
24 static const efi_guid_t efi_rt_properties_table_guid =
25 EFI_RT_PROPERTIES_TABLE_GUID;
26
27 struct efi_runtime_mmio_list {
28 struct list_head link;
29 void **ptr;
30 u64 paddr;
31 u64 len;
32 };
33
34 /* This list contains all runtime available mmio regions */
35 LIST_HEAD(efi_runtime_mmio);
36
37 static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void);
38
39 /*
40 * TODO(sjg@chromium.org): These defines and structures should come from the ELF
41 * header for each architecture (or a generic header) rather than being repeated
42 * here.
43 */
44 #if defined(__aarch64__)
45 #define R_RELATIVE R_AARCH64_RELATIVE
46 #define R_MASK 0xffffffffULL
47 #define IS_RELA 1
48 #elif defined(__arm__)
49 #define R_RELATIVE R_ARM_RELATIVE
50 #define R_MASK 0xffULL
51 #elif defined(__i386__)
52 #define R_RELATIVE R_386_RELATIVE
53 #define R_MASK 0xffULL
54 #elif defined(__x86_64__)
55 #define R_RELATIVE R_X86_64_RELATIVE
56 #define R_MASK 0xffffffffULL
57 #define IS_RELA 1
58 #elif defined(__riscv)
59 #define R_RELATIVE R_RISCV_RELATIVE
60 #define R_MASK 0xffULL
61 #define IS_RELA 1
62
63 struct dyn_sym {
64 ulong foo1;
65 ulong addr;
66 u32 foo2;
67 u32 foo3;
68 };
69 #if (__riscv_xlen == 32)
70 #define R_ABSOLUTE R_RISCV_32
71 #define SYM_INDEX 8
72 #elif (__riscv_xlen == 64)
73 #define R_ABSOLUTE R_RISCV_64
74 #define SYM_INDEX 32
75 #else
76 #error unknown riscv target
77 #endif
78 #else
79 #error Need to add relocation awareness
80 #endif
81
82 struct elf_rel {
83 ulong *offset;
84 ulong info;
85 };
86
87 struct elf_rela {
88 ulong *offset;
89 ulong info;
90 long addend;
91 };
92
93 static __efi_runtime_data struct efi_mem_desc *efi_virtmap;
94 static __efi_runtime_data efi_uintn_t efi_descriptor_count;
95 static __efi_runtime_data efi_uintn_t efi_descriptor_size;
96
97 /*
98 * EFI runtime code lives in two stages. In the first stage, U-Boot and an EFI
99 * payload are running concurrently at the same time. In this mode, we can
100 * handle a good number of runtime callbacks
101 */
102
103 /**
104 * efi_init_runtime_supported() - create runtime properties table
105 *
106 * Create a configuration table specifying which services are available at
107 * runtime.
108 *
109 * Return: status code
110 */
efi_init_runtime_supported(void)111 efi_status_t efi_init_runtime_supported(void)
112 {
113 efi_status_t ret;
114 struct efi_rt_properties_table *rt_table;
115
116 ret = efi_allocate_pool(EFI_RUNTIME_SERVICES_DATA,
117 sizeof(struct efi_rt_properties_table),
118 (void **)&rt_table);
119 if (ret != EFI_SUCCESS)
120 return ret;
121
122 rt_table->version = EFI_RT_PROPERTIES_TABLE_VERSION;
123 rt_table->length = sizeof(struct efi_rt_properties_table);
124 rt_table->runtime_services_supported =
125 EFI_RT_SUPPORTED_GET_VARIABLE |
126 EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME |
127 EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP |
128 EFI_RT_SUPPORTED_CONVERT_POINTER;
129
130 /*
131 * This value must be synced with efi_runtime_detach_list
132 * as well as efi_runtime_services.
133 */
134 #ifdef CONFIG_EFI_HAVE_RUNTIME_RESET
135 rt_table->runtime_services_supported |= EFI_RT_SUPPORTED_RESET_SYSTEM;
136 #endif
137
138 ret = efi_install_configuration_table(&efi_rt_properties_table_guid,
139 rt_table);
140 return ret;
141 }
142
143 /**
144 * efi_memcpy_runtime() - copy memory area
145 *
146 * At runtime memcpy() is not available.
147 *
148 * Overlapping memory areas can be copied safely if src >= dest.
149 *
150 * @dest: destination buffer
151 * @src: source buffer
152 * @n: number of bytes to copy
153 * Return: pointer to destination buffer
154 */
efi_memcpy_runtime(void * dest,const void * src,size_t n)155 void __efi_runtime efi_memcpy_runtime(void *dest, const void *src, size_t n)
156 {
157 u8 *d = dest;
158 const u8 *s = src;
159
160 for (; n; --n)
161 *d++ = *s++;
162 }
163
164 /**
165 * efi_update_table_header_crc32() - Update crc32 in table header
166 *
167 * @table: EFI table
168 */
efi_update_table_header_crc32(struct efi_table_hdr * table)169 void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table)
170 {
171 table->crc32 = 0;
172 table->crc32 = crc32(0, (const unsigned char *)table,
173 table->headersize);
174 }
175
176 /**
177 * efi_reset_system_boottime() - reset system at boot time
178 *
179 * This function implements the ResetSystem() runtime service before
180 * SetVirtualAddressMap() is called.
181 *
182 * See the Unified Extensible Firmware Interface (UEFI) specification for
183 * details.
184 *
185 * @reset_type: type of reset to perform
186 * @reset_status: status code for the reset
187 * @data_size: size of reset_data
188 * @reset_data: information about the reset
189 */
efi_reset_system_boottime(enum efi_reset_type reset_type,efi_status_t reset_status,unsigned long data_size,void * reset_data)190 static void EFIAPI efi_reset_system_boottime(
191 enum efi_reset_type reset_type,
192 efi_status_t reset_status,
193 unsigned long data_size, void *reset_data)
194 {
195 struct efi_event *evt;
196
197 EFI_ENTRY("%d %lx %lx %p", reset_type, reset_status, data_size,
198 reset_data);
199
200 /* Notify reset */
201 list_for_each_entry(evt, &efi_events, link) {
202 if (evt->group &&
203 !guidcmp(evt->group,
204 &efi_guid_event_group_reset_system)) {
205 efi_signal_event(evt);
206 break;
207 }
208 }
209 switch (reset_type) {
210 case EFI_RESET_COLD:
211 case EFI_RESET_WARM:
212 case EFI_RESET_PLATFORM_SPECIFIC:
213 do_reset(NULL, 0, 0, NULL);
214 break;
215 case EFI_RESET_SHUTDOWN:
216 #ifdef CONFIG_CMD_POWEROFF
217 do_poweroff(NULL, 0, 0, NULL);
218 #endif
219 break;
220 }
221
222 while (1) { }
223 }
224
225 /**
226 * efi_get_time_boottime() - get current time at boot time
227 *
228 * This function implements the GetTime runtime service before
229 * SetVirtualAddressMap() is called.
230 *
231 * See the Unified Extensible Firmware Interface (UEFI) specification
232 * for details.
233 *
234 * @time: pointer to structure to receive current time
235 * @capabilities: pointer to structure to receive RTC properties
236 * Returns: status code
237 */
efi_get_time_boottime(struct efi_time * time,struct efi_time_cap * capabilities)238 static efi_status_t EFIAPI efi_get_time_boottime(
239 struct efi_time *time,
240 struct efi_time_cap *capabilities)
241 {
242 #ifdef CONFIG_EFI_GET_TIME
243 efi_status_t ret = EFI_SUCCESS;
244 struct rtc_time tm;
245 struct udevice *dev;
246
247 EFI_ENTRY("%p %p", time, capabilities);
248
249 if (!time) {
250 ret = EFI_INVALID_PARAMETER;
251 goto out;
252 }
253 if (uclass_get_device(UCLASS_RTC, 0, &dev) ||
254 dm_rtc_get(dev, &tm)) {
255 ret = EFI_UNSUPPORTED;
256 goto out;
257 }
258 if (dm_rtc_get(dev, &tm)) {
259 ret = EFI_DEVICE_ERROR;
260 goto out;
261 }
262
263 memset(time, 0, sizeof(*time));
264 time->year = tm.tm_year;
265 time->month = tm.tm_mon;
266 time->day = tm.tm_mday;
267 time->hour = tm.tm_hour;
268 time->minute = tm.tm_min;
269 time->second = tm.tm_sec;
270 if (tm.tm_isdst > 0)
271 time->daylight =
272 EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT;
273 else if (!tm.tm_isdst)
274 time->daylight = EFI_TIME_ADJUST_DAYLIGHT;
275 else
276 time->daylight = 0;
277 time->timezone = EFI_UNSPECIFIED_TIMEZONE;
278
279 if (capabilities) {
280 /* Set reasonable dummy values */
281 capabilities->resolution = 1; /* 1 Hz */
282 capabilities->accuracy = 100000000; /* 100 ppm */
283 capabilities->sets_to_zero = false;
284 }
285 out:
286 return EFI_EXIT(ret);
287 #else
288 EFI_ENTRY("%p %p", time, capabilities);
289 return EFI_EXIT(EFI_UNSUPPORTED);
290 #endif
291 }
292
293 #ifdef CONFIG_EFI_SET_TIME
294
295 /**
296 * efi_validate_time() - checks if timestamp is valid
297 *
298 * @time: timestamp to validate
299 * Returns: 0 if timestamp is valid, 1 otherwise
300 */
efi_validate_time(struct efi_time * time)301 static int efi_validate_time(struct efi_time *time)
302 {
303 return (!time ||
304 time->year < 1900 || time->year > 9999 ||
305 !time->month || time->month > 12 || !time->day ||
306 time->day > rtc_month_days(time->month - 1, time->year) ||
307 time->hour > 23 || time->minute > 59 || time->second > 59 ||
308 time->nanosecond > 999999999 ||
309 time->daylight &
310 ~(EFI_TIME_IN_DAYLIGHT | EFI_TIME_ADJUST_DAYLIGHT) ||
311 ((time->timezone < -1440 || time->timezone > 1440) &&
312 time->timezone != EFI_UNSPECIFIED_TIMEZONE));
313 }
314
315 #endif
316
317 /**
318 * efi_set_time_boottime() - set current time
319 *
320 * This function implements the SetTime() runtime service before
321 * SetVirtualAddressMap() is called.
322 *
323 * See the Unified Extensible Firmware Interface (UEFI) specification
324 * for details.
325 *
326 * @time: pointer to structure to with current time
327 * Returns: status code
328 */
efi_set_time_boottime(struct efi_time * time)329 static efi_status_t EFIAPI efi_set_time_boottime(struct efi_time *time)
330 {
331 #ifdef CONFIG_EFI_SET_TIME
332 efi_status_t ret = EFI_SUCCESS;
333 struct rtc_time tm;
334 struct udevice *dev;
335
336 EFI_ENTRY("%p", time);
337
338 if (efi_validate_time(time)) {
339 ret = EFI_INVALID_PARAMETER;
340 goto out;
341 }
342
343 if (uclass_get_device(UCLASS_RTC, 0, &dev)) {
344 ret = EFI_UNSUPPORTED;
345 goto out;
346 }
347
348 memset(&tm, 0, sizeof(tm));
349 tm.tm_year = time->year;
350 tm.tm_mon = time->month;
351 tm.tm_mday = time->day;
352 tm.tm_hour = time->hour;
353 tm.tm_min = time->minute;
354 tm.tm_sec = time->second;
355 switch (time->daylight) {
356 case EFI_TIME_ADJUST_DAYLIGHT:
357 tm.tm_isdst = 0;
358 break;
359 case EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT:
360 tm.tm_isdst = 1;
361 break;
362 default:
363 tm.tm_isdst = -1;
364 break;
365 }
366 /* Calculate day of week */
367 rtc_calc_weekday(&tm);
368
369 if (dm_rtc_set(dev, &tm))
370 ret = EFI_DEVICE_ERROR;
371 out:
372 return EFI_EXIT(ret);
373 #else
374 EFI_ENTRY("%p", time);
375 return EFI_EXIT(EFI_UNSUPPORTED);
376 #endif
377 }
378 /**
379 * efi_reset_system() - reset system
380 *
381 * This function implements the ResetSystem() runtime service after
382 * SetVirtualAddressMap() is called. As this placeholder cannot reset the
383 * system it simply return to the caller.
384 *
385 * Boards may override the helpers below to implement reset functionality.
386 *
387 * See the Unified Extensible Firmware Interface (UEFI) specification for
388 * details.
389 *
390 * @reset_type: type of reset to perform
391 * @reset_status: status code for the reset
392 * @data_size: size of reset_data
393 * @reset_data: information about the reset
394 */
efi_reset_system(enum efi_reset_type reset_type,efi_status_t reset_status,unsigned long data_size,void * reset_data)395 void __weak __efi_runtime EFIAPI efi_reset_system(
396 enum efi_reset_type reset_type,
397 efi_status_t reset_status,
398 unsigned long data_size, void *reset_data)
399 {
400 return;
401 }
402
403 /**
404 * efi_reset_system_init() - initialize the reset driver
405 *
406 * Boards may override this function to initialize the reset driver.
407 */
efi_reset_system_init(void)408 efi_status_t __weak efi_reset_system_init(void)
409 {
410 return EFI_SUCCESS;
411 }
412
413 /**
414 * efi_get_time() - get current time
415 *
416 * This function implements the GetTime runtime service after
417 * SetVirtualAddressMap() is called. As the U-Boot driver are not available
418 * anymore only an error code is returned.
419 *
420 * See the Unified Extensible Firmware Interface (UEFI) specification
421 * for details.
422 *
423 * @time: pointer to structure to receive current time
424 * @capabilities: pointer to structure to receive RTC properties
425 * Returns: status code
426 */
efi_get_time(struct efi_time * time,struct efi_time_cap * capabilities)427 efi_status_t __weak __efi_runtime EFIAPI efi_get_time(
428 struct efi_time *time,
429 struct efi_time_cap *capabilities)
430 {
431 return EFI_UNSUPPORTED;
432 }
433
434 /**
435 * efi_set_time() - set current time
436 *
437 * This function implements the SetTime runtime service after
438 * SetVirtualAddressMap() is called. As the U-Boot driver are not available
439 * anymore only an error code is returned.
440 *
441 * See the Unified Extensible Firmware Interface (UEFI) specification
442 * for details.
443 *
444 * @time: pointer to structure to with current time
445 * Returns: status code
446 */
efi_set_time(struct efi_time * time)447 efi_status_t __weak __efi_runtime EFIAPI efi_set_time(struct efi_time *time)
448 {
449 return EFI_UNSUPPORTED;
450 }
451
452 /**
453 * efi_update_capsule_unsupported() - process information from operating system
454 *
455 * This function implements the UpdateCapsule() runtime service.
456 *
457 * See the Unified Extensible Firmware Interface (UEFI) specification for
458 * details.
459 *
460 * @capsule_header_array: pointer to array of virtual pointers
461 * @capsule_count: number of pointers in capsule_header_array
462 * @scatter_gather_list: pointer to array of physical pointers
463 * Returns: status code
464 */
efi_update_capsule_unsupported(struct efi_capsule_header ** capsule_header_array,efi_uintn_t capsule_count,u64 scatter_gather_list)465 efi_status_t __efi_runtime EFIAPI efi_update_capsule_unsupported(
466 struct efi_capsule_header **capsule_header_array,
467 efi_uintn_t capsule_count,
468 u64 scatter_gather_list)
469 {
470 return EFI_UNSUPPORTED;
471 }
472
473 /**
474 * efi_query_capsule_caps_unsupported() - check if capsule is supported
475 *
476 * This function implements the QueryCapsuleCapabilities() runtime service.
477 *
478 * See the Unified Extensible Firmware Interface (UEFI) specification for
479 * details.
480 *
481 * @capsule_header_array: pointer to array of virtual pointers
482 * @capsule_count: number of pointers in capsule_header_array
483 * @maximum_capsule_size: maximum capsule size
484 * @reset_type: type of reset needed for capsule update
485 * Returns: status code
486 */
efi_query_capsule_caps_unsupported(struct efi_capsule_header ** capsule_header_array,efi_uintn_t capsule_count,u64 * maximum_capsule_size,u32 * reset_type)487 efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps_unsupported(
488 struct efi_capsule_header **capsule_header_array,
489 efi_uintn_t capsule_count,
490 u64 *maximum_capsule_size,
491 u32 *reset_type)
492 {
493 return EFI_UNSUPPORTED;
494 }
495
496 /**
497 * efi_is_runtime_service_pointer() - check if pointer points to runtime table
498 *
499 * @p: pointer to check
500 * Return: true if the pointer points to a service function pointer in the
501 * runtime table
502 */
efi_is_runtime_service_pointer(void * p)503 static bool efi_is_runtime_service_pointer(void *p)
504 {
505 return (p >= (void *)&efi_runtime_services.get_time &&
506 p <= (void *)&efi_runtime_services.query_variable_info) ||
507 p == (void *)&efi_events.prev ||
508 p == (void *)&efi_events.next;
509 }
510
511 /**
512 * efi_runtime_detach() - detach unimplemented runtime functions
513 */
efi_runtime_detach(void)514 void efi_runtime_detach(void)
515 {
516 efi_runtime_services.reset_system = efi_reset_system;
517 efi_runtime_services.get_time = efi_get_time;
518 efi_runtime_services.set_time = efi_set_time;
519 if (IS_ENABLED(CONFIG_EFI_RUNTIME_UPDATE_CAPSULE)) {
520 /* won't support at runtime */
521 efi_runtime_services.update_capsule =
522 efi_update_capsule_unsupported;
523 efi_runtime_services.query_capsule_caps =
524 efi_query_capsule_caps_unsupported;
525 }
526
527 /* Update CRC32 */
528 efi_update_table_header_crc32(&efi_runtime_services.hdr);
529 }
530
531 /**
532 * efi_set_virtual_address_map_runtime() - change from physical to virtual
533 * mapping
534 *
535 * This function implements the SetVirtualAddressMap() runtime service after
536 * it is first called.
537 *
538 * See the Unified Extensible Firmware Interface (UEFI) specification for
539 * details.
540 *
541 * @memory_map_size: size of the virtual map
542 * @descriptor_size: size of an entry in the map
543 * @descriptor_version: version of the map entries
544 * @virtmap: virtual address mapping information
545 * Return: status code EFI_UNSUPPORTED
546 */
efi_set_virtual_address_map_runtime(efi_uintn_t memory_map_size,efi_uintn_t descriptor_size,uint32_t descriptor_version,struct efi_mem_desc * virtmap)547 static __efi_runtime efi_status_t EFIAPI efi_set_virtual_address_map_runtime(
548 efi_uintn_t memory_map_size,
549 efi_uintn_t descriptor_size,
550 uint32_t descriptor_version,
551 struct efi_mem_desc *virtmap)
552 {
553 return EFI_UNSUPPORTED;
554 }
555
556 /**
557 * efi_convert_pointer_runtime() - convert from physical to virtual pointer
558 *
559 * This function implements the ConvertPointer() runtime service after
560 * the first call to SetVirtualAddressMap().
561 *
562 * See the Unified Extensible Firmware Interface (UEFI) specification for
563 * details.
564 *
565 * @debug_disposition: indicates if pointer may be converted to NULL
566 * @address: pointer to be converted
567 * Return: status code EFI_UNSUPPORTED
568 */
efi_convert_pointer_runtime(efi_uintn_t debug_disposition,void ** address)569 static __efi_runtime efi_status_t EFIAPI efi_convert_pointer_runtime(
570 efi_uintn_t debug_disposition, void **address)
571 {
572 return EFI_UNSUPPORTED;
573 }
574
575 /**
576 * efi_convert_pointer() - convert from physical to virtual pointer
577 *
578 * This function implements the ConvertPointer() runtime service until
579 * the first call to SetVirtualAddressMap().
580 *
581 * See the Unified Extensible Firmware Interface (UEFI) specification for
582 * details.
583 *
584 * @debug_disposition: indicates if pointer may be converted to NULL
585 * @address: pointer to be converted
586 * Return: status code
587 */
588 __efi_runtime efi_status_t EFIAPI
efi_convert_pointer(efi_uintn_t debug_disposition,void ** address)589 efi_convert_pointer(efi_uintn_t debug_disposition, void **address)
590 {
591 efi_physical_addr_t addr;
592 efi_uintn_t i;
593 efi_status_t ret = EFI_NOT_FOUND;
594
595 if (!efi_virtmap) {
596 ret = EFI_UNSUPPORTED;
597 goto out;
598 }
599
600 if (!address) {
601 ret = EFI_INVALID_PARAMETER;
602 goto out;
603 }
604 if (!*address) {
605 if (debug_disposition & EFI_OPTIONAL_PTR)
606 return EFI_SUCCESS;
607 else
608 return EFI_INVALID_PARAMETER;
609 }
610
611 addr = (uintptr_t)*address;
612 for (i = 0; i < efi_descriptor_count; i++) {
613 struct efi_mem_desc *map = (void *)efi_virtmap +
614 (efi_descriptor_size * i);
615
616 if (addr >= map->physical_start &&
617 (addr < map->physical_start
618 + (map->num_pages << EFI_PAGE_SHIFT))) {
619 *address = (void *)(uintptr_t)
620 (addr + map->virtual_start -
621 map->physical_start);
622
623 ret = EFI_SUCCESS;
624 break;
625 }
626 }
627
628 out:
629 return ret;
630 }
631
efi_relocate_runtime_table(ulong offset)632 static __efi_runtime void efi_relocate_runtime_table(ulong offset)
633 {
634 ulong patchoff;
635 void **pos;
636
637 /* Relocate the runtime services pointers */
638 patchoff = offset - gd->relocaddr;
639 for (pos = (void **)&efi_runtime_services.get_time;
640 pos <= (void **)&efi_runtime_services.query_variable_info; ++pos) {
641 if (*pos)
642 *pos += patchoff;
643 }
644
645 /*
646 * The entry for SetVirtualAddress() must point to a physical address.
647 * After the first execution the service must return EFI_UNSUPPORTED.
648 */
649 efi_runtime_services.set_virtual_address_map =
650 &efi_set_virtual_address_map_runtime;
651
652 /*
653 * The entry for ConvertPointer() must point to a physical address.
654 * The service is not usable after SetVirtualAddress().
655 */
656 efi_runtime_services.convert_pointer = &efi_convert_pointer_runtime;
657
658 /*
659 * TODO: Update UEFI variable RuntimeServicesSupported removing flags
660 * EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP and
661 * EFI_RT_SUPPORTED_CONVERT_POINTER as required by the UEFI spec 2.8.
662 */
663
664 /* Update CRC32 */
665 efi_update_table_header_crc32(&efi_runtime_services.hdr);
666 }
667
668 /* Relocate EFI runtime to uboot_reloc_base = offset */
efi_runtime_relocate(ulong offset,struct efi_mem_desc * map)669 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map)
670 {
671 #ifdef IS_RELA
672 struct elf_rela *rel = (void*)&__efi_runtime_rel_start;
673 #else
674 struct elf_rel *rel = (void*)&__efi_runtime_rel_start;
675 static ulong lastoff = CONFIG_SYS_TEXT_BASE;
676 #endif
677
678 debug("%s: Relocating to offset=%lx\n", __func__, offset);
679 for (; (ulong)rel < (ulong)&__efi_runtime_rel_stop; rel++) {
680 ulong base = CONFIG_SYS_TEXT_BASE;
681 ulong *p;
682 ulong newaddr;
683
684 p = (void*)((ulong)rel->offset - base) + gd->relocaddr;
685
686 /*
687 * The runtime services table is updated in
688 * efi_relocate_runtime_table()
689 */
690 if (map && efi_is_runtime_service_pointer(p))
691 continue;
692
693 debug("%s: rel->info=%#lx *p=%#lx rel->offset=%p\n", __func__,
694 rel->info, *p, rel->offset);
695
696 switch (rel->info & R_MASK) {
697 case R_RELATIVE:
698 #ifdef IS_RELA
699 newaddr = rel->addend + offset - CONFIG_SYS_TEXT_BASE;
700 #else
701 newaddr = *p - lastoff + offset;
702 #endif
703 break;
704 #ifdef R_ABSOLUTE
705 case R_ABSOLUTE: {
706 ulong symidx = rel->info >> SYM_INDEX;
707 extern struct dyn_sym __dyn_sym_start[];
708 newaddr = __dyn_sym_start[symidx].addr + offset;
709 #ifdef IS_RELA
710 newaddr -= CONFIG_SYS_TEXT_BASE;
711 #endif
712 break;
713 }
714 #endif
715 default:
716 printf("%s: Unknown relocation type %llx\n",
717 __func__, rel->info & R_MASK);
718 continue;
719 }
720
721 /* Check if the relocation is inside bounds */
722 if (map && ((newaddr < map->virtual_start) ||
723 newaddr > (map->virtual_start +
724 (map->num_pages << EFI_PAGE_SHIFT)))) {
725 printf("%s: Relocation at %p is out of range (%lx)\n",
726 __func__, p, newaddr);
727 continue;
728 }
729
730 debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
731 *p = newaddr;
732 flush_dcache_range((ulong)p & ~(EFI_CACHELINE_SIZE - 1),
733 ALIGN((ulong)&p[1], EFI_CACHELINE_SIZE));
734 }
735
736 #ifndef IS_RELA
737 lastoff = offset;
738 #endif
739
740 invalidate_icache_all();
741 }
742
743 /**
744 * efi_set_virtual_address_map() - change from physical to virtual mapping
745 *
746 * This function implements the SetVirtualAddressMap() runtime service.
747 *
748 * See the Unified Extensible Firmware Interface (UEFI) specification for
749 * details.
750 *
751 * @memory_map_size: size of the virtual map
752 * @descriptor_size: size of an entry in the map
753 * @descriptor_version: version of the map entries
754 * @virtmap: virtual address mapping information
755 * Return: status code
756 */
efi_set_virtual_address_map(efi_uintn_t memory_map_size,efi_uintn_t descriptor_size,uint32_t descriptor_version,struct efi_mem_desc * virtmap)757 static efi_status_t EFIAPI efi_set_virtual_address_map(
758 efi_uintn_t memory_map_size,
759 efi_uintn_t descriptor_size,
760 uint32_t descriptor_version,
761 struct efi_mem_desc *virtmap)
762 {
763 efi_uintn_t n = memory_map_size / descriptor_size;
764 efi_uintn_t i;
765 efi_status_t ret = EFI_INVALID_PARAMETER;
766 int rt_code_sections = 0;
767 struct efi_event *event;
768
769 EFI_ENTRY("%zx %zx %x %p", memory_map_size, descriptor_size,
770 descriptor_version, virtmap);
771
772 if (descriptor_version != EFI_MEMORY_DESCRIPTOR_VERSION ||
773 descriptor_size < sizeof(struct efi_mem_desc))
774 goto out;
775
776 efi_virtmap = virtmap;
777 efi_descriptor_size = descriptor_size;
778 efi_descriptor_count = n;
779
780 /*
781 * TODO:
782 * Further down we are cheating. While really we should implement
783 * SetVirtualAddressMap() events and ConvertPointer() to allow
784 * dynamically loaded drivers to expose runtime services, we don't
785 * today.
786 *
787 * So let's ensure we see exactly one single runtime section, as
788 * that is the built-in one. If we see more (or less), someone must
789 * have tried adding or removing to that which we don't support yet.
790 * In that case, let's better fail rather than expose broken runtime
791 * services.
792 */
793 for (i = 0; i < n; i++) {
794 struct efi_mem_desc *map = (void*)virtmap +
795 (descriptor_size * i);
796
797 if (map->type == EFI_RUNTIME_SERVICES_CODE)
798 rt_code_sections++;
799 }
800
801 if (rt_code_sections != 1) {
802 /*
803 * We expose exactly one single runtime code section, so
804 * something is definitely going wrong.
805 */
806 goto out;
807 }
808
809 /* Notify EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE */
810 list_for_each_entry(event, &efi_events, link) {
811 if (event->notify_function)
812 EFI_CALL_VOID(event->notify_function(
813 event, event->notify_context));
814 }
815
816 /* Rebind mmio pointers */
817 for (i = 0; i < n; i++) {
818 struct efi_mem_desc *map = (void*)virtmap +
819 (descriptor_size * i);
820 struct list_head *lhandle;
821 efi_physical_addr_t map_start = map->physical_start;
822 efi_physical_addr_t map_len = map->num_pages << EFI_PAGE_SHIFT;
823 efi_physical_addr_t map_end = map_start + map_len;
824 u64 off = map->virtual_start - map_start;
825
826 /* Adjust all mmio pointers in this region */
827 list_for_each(lhandle, &efi_runtime_mmio) {
828 struct efi_runtime_mmio_list *lmmio;
829
830 lmmio = list_entry(lhandle,
831 struct efi_runtime_mmio_list,
832 link);
833 if ((map_start <= lmmio->paddr) &&
834 (map_end >= lmmio->paddr)) {
835 uintptr_t new_addr = lmmio->paddr + off;
836 *lmmio->ptr = (void *)new_addr;
837 }
838 }
839 if ((map_start <= (uintptr_t)systab.tables) &&
840 (map_end >= (uintptr_t)systab.tables)) {
841 char *ptr = (char *)systab.tables;
842
843 ptr += off;
844 systab.tables = (struct efi_configuration_table *)ptr;
845 }
846 }
847
848 /* Relocate the runtime. See TODO above */
849 for (i = 0; i < n; i++) {
850 struct efi_mem_desc *map;
851
852 map = (void*)virtmap + (descriptor_size * i);
853 if (map->type == EFI_RUNTIME_SERVICES_CODE) {
854 ulong new_offset = map->virtual_start -
855 map->physical_start + gd->relocaddr;
856
857 efi_relocate_runtime_table(new_offset);
858 efi_runtime_relocate(new_offset, map);
859 ret = EFI_SUCCESS;
860 goto out;
861 }
862 }
863
864 out:
865 return EFI_EXIT(ret);
866 }
867
868 /**
869 * efi_add_runtime_mmio() - add memory-mapped IO region
870 *
871 * This function adds a memory-mapped IO region to the memory map to make it
872 * available at runtime.
873 *
874 * @mmio_ptr: pointer to a pointer to the start of the memory-mapped
875 * IO region
876 * @len: size of the memory-mapped IO region
877 * Returns: status code
878 */
efi_add_runtime_mmio(void * mmio_ptr,u64 len)879 efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
880 {
881 struct efi_runtime_mmio_list *newmmio;
882 uint64_t addr = *(uintptr_t *)mmio_ptr;
883 efi_status_t ret;
884
885 ret = efi_add_memory_map(addr, len, EFI_MMAP_IO);
886 if (ret != EFI_SUCCESS)
887 return EFI_OUT_OF_RESOURCES;
888
889 newmmio = calloc(1, sizeof(*newmmio));
890 if (!newmmio)
891 return EFI_OUT_OF_RESOURCES;
892 newmmio->ptr = mmio_ptr;
893 newmmio->paddr = *(uintptr_t *)mmio_ptr;
894 newmmio->len = len;
895 list_add_tail(&newmmio->link, &efi_runtime_mmio);
896
897 return EFI_SUCCESS;
898 }
899
900 /*
901 * In the second stage, U-Boot has disappeared. To isolate our runtime code
902 * that at this point still exists from the rest, we put it into a special
903 * section.
904 *
905 * !!WARNING!!
906 *
907 * This means that we can not rely on any code outside of this file in any
908 * function or variable below this line.
909 *
910 * Please keep everything fully self-contained and annotated with
911 * __efi_runtime and __efi_runtime_data markers.
912 */
913
914 /*
915 * Relocate the EFI runtime stub to a different place. We need to call this
916 * the first time we expose the runtime interface to a user and on set virtual
917 * address map calls.
918 */
919
920 /**
921 * efi_unimplemented() - replacement function, returns EFI_UNSUPPORTED
922 *
923 * This function is used after SetVirtualAddressMap() is called as replacement
924 * for services that are not available anymore due to constraints of the U-Boot
925 * implementation.
926 *
927 * Return: EFI_UNSUPPORTED
928 */
efi_unimplemented(void)929 static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void)
930 {
931 return EFI_UNSUPPORTED;
932 }
933
934 struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
935 .hdr = {
936 .signature = EFI_RUNTIME_SERVICES_SIGNATURE,
937 .revision = EFI_SPECIFICATION_VERSION,
938 .headersize = sizeof(struct efi_runtime_services),
939 },
940 .get_time = &efi_get_time_boottime,
941 .set_time = &efi_set_time_boottime,
942 .get_wakeup_time = (void *)&efi_unimplemented,
943 .set_wakeup_time = (void *)&efi_unimplemented,
944 .set_virtual_address_map = &efi_set_virtual_address_map,
945 .convert_pointer = efi_convert_pointer,
946 .get_variable = efi_get_variable,
947 .get_next_variable_name = efi_get_next_variable_name,
948 .set_variable = efi_set_variable,
949 .get_next_high_mono_count = (void *)&efi_unimplemented,
950 .reset_system = &efi_reset_system_boottime,
951 #ifdef CONFIG_EFI_RUNTIME_UPDATE_CAPSULE
952 .update_capsule = efi_update_capsule,
953 .query_capsule_caps = efi_query_capsule_caps,
954 #else
955 .update_capsule = efi_update_capsule_unsupported,
956 .query_capsule_caps = efi_query_capsule_caps_unsupported,
957 #endif
958 .query_variable_info = efi_query_variable_info,
959 };
960