1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: oslinuxtbl - Linux OSL for obtaining ACPI tables
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include "acpidump.h"
11
12 #define _COMPONENT ACPI_OS_SERVICES
13 ACPI_MODULE_NAME("oslinuxtbl")
14
15 #ifndef PATH_MAX
16 #define PATH_MAX 256
17 #endif
18 /* List of information about obtained ACPI tables */
19 typedef struct osl_table_info {
20 struct osl_table_info *next;
21 u32 instance;
22 char signature[ACPI_NAMESEG_SIZE];
23
24 } osl_table_info;
25
26 /* Local prototypes */
27
28 static acpi_status osl_table_initialize(void);
29
30 static acpi_status
31 osl_table_name_from_file(char *filename, char *signature, u32 *instance);
32
33 static acpi_status osl_add_table_to_list(char *signature, u32 instance);
34
35 static acpi_status
36 osl_read_table_from_file(char *filename,
37 acpi_size file_offset,
38 char *signature, struct acpi_table_header **table);
39
40 static acpi_status
41 osl_map_table(acpi_size address,
42 char *signature, struct acpi_table_header **table);
43
44 static void osl_unmap_table(struct acpi_table_header *table);
45
46 static acpi_physical_address
47 osl_find_rsdp_via_efi_by_keyword(FILE * file, const char *keyword);
48
49 static acpi_physical_address osl_find_rsdp_via_efi(void);
50
51 static acpi_status osl_load_rsdp(void);
52
53 static acpi_status osl_list_customized_tables(char *directory);
54
55 static acpi_status
56 osl_get_customized_table(char *pathname,
57 char *signature,
58 u32 instance,
59 struct acpi_table_header **table,
60 acpi_physical_address *address);
61
62 static acpi_status osl_list_bios_tables(void);
63
64 static acpi_status
65 osl_get_bios_table(char *signature,
66 u32 instance,
67 struct acpi_table_header **table,
68 acpi_physical_address *address);
69
70 static acpi_status osl_get_last_status(acpi_status default_status);
71
72 /* File locations */
73
74 #define DYNAMIC_TABLE_DIR "/sys/firmware/acpi/tables/dynamic"
75 #define STATIC_TABLE_DIR "/sys/firmware/acpi/tables"
76 #define EFI_SYSTAB "/sys/firmware/efi/systab"
77
78 /* Should we get dynamically loaded SSDTs from DYNAMIC_TABLE_DIR? */
79
80 u8 gbl_dump_dynamic_tables = TRUE;
81
82 /* Initialization flags */
83
84 u8 gbl_table_list_initialized = FALSE;
85
86 /* Local copies of main ACPI tables */
87
88 struct acpi_table_rsdp gbl_rsdp;
89 struct acpi_table_fadt *gbl_fadt = NULL;
90 struct acpi_table_rsdt *gbl_rsdt = NULL;
91 struct acpi_table_xsdt *gbl_xsdt = NULL;
92
93 /* Table addresses */
94
95 acpi_physical_address gbl_fadt_address = 0;
96 acpi_physical_address gbl_rsdp_address = 0;
97
98 /* Revision of RSD PTR */
99
100 u8 gbl_revision = 0;
101
102 struct osl_table_info *gbl_table_list_head = NULL;
103 u32 gbl_table_count = 0;
104
105 /******************************************************************************
106 *
107 * FUNCTION: osl_get_last_status
108 *
109 * PARAMETERS: default_status - Default error status to return
110 *
111 * RETURN: Status; Converted from errno.
112 *
113 * DESCRIPTION: Get last errno and conver it to acpi_status.
114 *
115 *****************************************************************************/
116
117 static acpi_status osl_get_last_status(acpi_status default_status)
118 {
119
120 switch (errno) {
121 case EACCES:
122 case EPERM:
123
124 return (AE_ACCESS);
125
126 case ENOENT:
127
128 return (AE_NOT_FOUND);
129
130 case ENOMEM:
131
132 return (AE_NO_MEMORY);
133
134 default:
135
136 return (default_status);
137 }
138 }
139
140 /******************************************************************************
141 *
142 * FUNCTION: acpi_os_get_table_by_address
143 *
144 * PARAMETERS: address - Physical address of the ACPI table
145 * table - Where a pointer to the table is returned
146 *
147 * RETURN: Status; Table buffer is returned if AE_OK.
148 * AE_NOT_FOUND: A valid table was not found at the address
149 *
150 * DESCRIPTION: Get an ACPI table via a physical memory address.
151 *
152 *****************************************************************************/
153
154 acpi_status
155 acpi_os_get_table_by_address(acpi_physical_address address,
156 struct acpi_table_header **table)
157 {
158 u32 table_length;
159 struct acpi_table_header *mapped_table;
160 struct acpi_table_header *local_table = NULL;
161 acpi_status status = AE_OK;
162
163 /* Get main ACPI tables from memory on first invocation of this function */
164
165 status = osl_table_initialize();
166 if (ACPI_FAILURE(status)) {
167 return (status);
168 }
169
170 /* Map the table and validate it */
171
172 status = osl_map_table(address, NULL, &mapped_table);
173 if (ACPI_FAILURE(status)) {
174 return (status);
175 }
176
177 /* Copy table to local buffer and return it */
178
179 table_length = ap_get_table_length(mapped_table);
180 if (table_length == 0) {
181 status = AE_BAD_HEADER;
182 goto exit;
183 }
184
185 local_table = calloc(1, table_length);
186 if (!local_table) {
187 status = AE_NO_MEMORY;
188 goto exit;
189 }
190
191 memcpy(local_table, mapped_table, table_length);
192
193 exit:
194 osl_unmap_table(mapped_table);
195 *table = local_table;
196 return (status);
197 }
198
199 /******************************************************************************
200 *
201 * FUNCTION: acpi_os_get_table_by_name
202 *
203 * PARAMETERS: signature - ACPI Signature for desired table. Must be
204 * a null terminated 4-character string.
205 * instance - Multiple table support for SSDT/UEFI (0...n)
206 * Must be 0 for other tables.
207 * table - Where a pointer to the table is returned
208 * address - Where the table physical address is returned
209 *
210 * RETURN: Status; Table buffer and physical address returned if AE_OK.
211 * AE_LIMIT: Instance is beyond valid limit
212 * AE_NOT_FOUND: A table with the signature was not found
213 *
214 * NOTE: Assumes the input signature is uppercase.
215 *
216 *****************************************************************************/
217
218 acpi_status
219 acpi_os_get_table_by_name(char *signature,
220 u32 instance,
221 struct acpi_table_header **table,
222 acpi_physical_address *address)
223 {
224 acpi_status status;
225
226 /* Get main ACPI tables from memory on first invocation of this function */
227
228 status = osl_table_initialize();
229 if (ACPI_FAILURE(status)) {
230 return (status);
231 }
232
233 /* Not a main ACPI table, attempt to extract it from the RSDT/XSDT */
234
235 if (!gbl_dump_customized_tables) {
236
237 /* Attempt to get the table from the memory */
238
239 status =
240 osl_get_bios_table(signature, instance, table, address);
241 } else {
242 /* Attempt to get the table from the static directory */
243
244 status = osl_get_customized_table(STATIC_TABLE_DIR, signature,
245 instance, table, address);
246 }
247
248 if (ACPI_FAILURE(status) && status == AE_LIMIT) {
249 if (gbl_dump_dynamic_tables) {
250
251 /* Attempt to get a dynamic table */
252
253 status =
254 osl_get_customized_table(DYNAMIC_TABLE_DIR,
255 signature, instance, table,
256 address);
257 }
258 }
259
260 return (status);
261 }
262
263 /******************************************************************************
264 *
265 * FUNCTION: osl_add_table_to_list
266 *
267 * PARAMETERS: signature - Table signature
268 * instance - Table instance
269 *
270 * RETURN: Status; Successfully added if AE_OK.
271 * AE_NO_MEMORY: Memory allocation error
272 *
273 * DESCRIPTION: Insert a table structure into OSL table list.
274 *
275 *****************************************************************************/
276
277 static acpi_status osl_add_table_to_list(char *signature, u32 instance)
278 {
279 struct osl_table_info *new_info;
280 struct osl_table_info *next;
281 u32 next_instance = 0;
282 u8 found = FALSE;
283
284 new_info = calloc(1, sizeof(struct osl_table_info));
285 if (!new_info) {
286 return (AE_NO_MEMORY);
287 }
288
289 ACPI_COPY_NAMESEG(new_info->signature, signature);
290
291 if (!gbl_table_list_head) {
292 gbl_table_list_head = new_info;
293 } else {
294 next = gbl_table_list_head;
295 while (1) {
296 if (ACPI_COMPARE_NAMESEG(next->signature, signature)) {
297 if (next->instance == instance) {
298 found = TRUE;
299 }
300 if (next->instance >= next_instance) {
301 next_instance = next->instance + 1;
302 }
303 }
304
305 if (!next->next) {
306 break;
307 }
308 next = next->next;
309 }
310 next->next = new_info;
311 }
312
313 if (found) {
314 if (instance) {
315 fprintf(stderr,
316 "%4.4s: Warning unmatched table instance %d, expected %d\n",
317 signature, instance, next_instance);
318 }
319 instance = next_instance;
320 }
321
322 new_info->instance = instance;
323 gbl_table_count++;
324
325 return (AE_OK);
326 }
327
328 /******************************************************************************
329 *
330 * FUNCTION: acpi_os_get_table_by_index
331 *
332 * PARAMETERS: index - Which table to get
333 * table - Where a pointer to the table is returned
334 * instance - Where a pointer to the table instance no. is
335 * returned
336 * address - Where the table physical address is returned
337 *
338 * RETURN: Status; Table buffer and physical address returned if AE_OK.
339 * AE_LIMIT: Index is beyond valid limit
340 *
341 * DESCRIPTION: Get an ACPI table via an index value (0 through n). Returns
342 * AE_LIMIT when an invalid index is reached. Index is not
343 * necessarily an index into the RSDT/XSDT.
344 *
345 *****************************************************************************/
346
347 acpi_status
348 acpi_os_get_table_by_index(u32 index,
349 struct acpi_table_header **table,
350 u32 *instance, acpi_physical_address *address)
351 {
352 struct osl_table_info *info;
353 acpi_status status;
354 u32 i;
355
356 /* Get main ACPI tables from memory on first invocation of this function */
357
358 status = osl_table_initialize();
359 if (ACPI_FAILURE(status)) {
360 return (status);
361 }
362
363 /* Validate Index */
364
365 if (index >= gbl_table_count) {
366 return (AE_LIMIT);
367 }
368
369 /* Point to the table list entry specified by the Index argument */
370
371 info = gbl_table_list_head;
372 for (i = 0; i < index; i++) {
373 info = info->next;
374 }
375
376 /* Now we can just get the table via the signature */
377
378 status = acpi_os_get_table_by_name(info->signature, info->instance,
379 table, address);
380
381 if (ACPI_SUCCESS(status)) {
382 *instance = info->instance;
383 }
384 return (status);
385 }
386
387 /******************************************************************************
388 *
389 * FUNCTION: osl_find_rsdp_via_efi_by_keyword
390 *
391 * PARAMETERS: keyword - Character string indicating ACPI GUID version
392 * in the EFI table
393 *
394 * RETURN: RSDP address if found
395 *
396 * DESCRIPTION: Find RSDP address via EFI using keyword indicating the ACPI
397 * GUID version.
398 *
399 *****************************************************************************/
400
401 static acpi_physical_address
402 osl_find_rsdp_via_efi_by_keyword(FILE * file, const char *keyword)
403 {
404 char buffer[80];
405 unsigned long long address = 0;
406 char format[32];
407
408 snprintf(format, 32, "%s=%s", keyword, "%llx");
409 fseek(file, 0, SEEK_SET);
410 while (fgets(buffer, 80, file)) {
411 if (sscanf(buffer, format, &address) == 1) {
412 break;
413 }
414 }
415
416 return ((acpi_physical_address)(address));
417 }
418
419 /******************************************************************************
420 *
421 * FUNCTION: osl_find_rsdp_via_efi
422 *
423 * PARAMETERS: None
424 *
425 * RETURN: RSDP address if found
426 *
427 * DESCRIPTION: Find RSDP address via EFI.
428 *
429 *****************************************************************************/
430
431 static acpi_physical_address osl_find_rsdp_via_efi(void)
432 {
433 FILE *file;
434 acpi_physical_address address = 0;
435
436 file = fopen(EFI_SYSTAB, "r");
437 if (file) {
438 address = osl_find_rsdp_via_efi_by_keyword(file, "ACPI20");
439 if (!address) {
440 address =
441 osl_find_rsdp_via_efi_by_keyword(file, "ACPI");
442 }
443 fclose(file);
444 }
445
446 return (address);
447 }
448
449 /******************************************************************************
450 *
451 * FUNCTION: osl_load_rsdp
452 *
453 * PARAMETERS: None
454 *
455 * RETURN: Status
456 *
457 * DESCRIPTION: Scan and load RSDP.
458 *
459 *****************************************************************************/
460
461 static acpi_status osl_load_rsdp(void)
462 {
463 struct acpi_table_header *mapped_table;
464 u8 *rsdp_address;
465 acpi_physical_address rsdp_base;
466 acpi_size rsdp_size;
467
468 /* Get RSDP from memory */
469
470 rsdp_size = sizeof(struct acpi_table_rsdp);
471 if (gbl_rsdp_base) {
472 rsdp_base = gbl_rsdp_base;
473 } else {
474 rsdp_base = osl_find_rsdp_via_efi();
475 }
476
477 if (!rsdp_base) {
478 rsdp_base = ACPI_HI_RSDP_WINDOW_BASE;
479 rsdp_size = ACPI_HI_RSDP_WINDOW_SIZE;
480 }
481
482 rsdp_address = acpi_os_map_memory(rsdp_base, rsdp_size);
483 if (!rsdp_address) {
484 return (osl_get_last_status(AE_BAD_ADDRESS));
485 }
486
487 /* Search low memory for the RSDP */
488
489 mapped_table = ACPI_CAST_PTR(struct acpi_table_header,
490 acpi_tb_scan_memory_for_rsdp(rsdp_address,
491 rsdp_size));
492 if (!mapped_table) {
493 acpi_os_unmap_memory(rsdp_address, rsdp_size);
494 return (AE_NOT_FOUND);
495 }
496
497 gbl_rsdp_address =
498 rsdp_base + (ACPI_CAST8(mapped_table) - rsdp_address);
499
500 memcpy(&gbl_rsdp, mapped_table, sizeof(struct acpi_table_rsdp));
501 acpi_os_unmap_memory(rsdp_address, rsdp_size);
502
503 return (AE_OK);
504 }
505
506 /******************************************************************************
507 *
508 * FUNCTION: osl_can_use_xsdt
509 *
510 * PARAMETERS: None
511 *
512 * RETURN: TRUE if XSDT is allowed to be used.
513 *
514 * DESCRIPTION: This function collects logic that can be used to determine if
515 * XSDT should be used instead of RSDT.
516 *
517 *****************************************************************************/
518
519 static u8 osl_can_use_xsdt(void)
520 {
521 if (gbl_revision && !acpi_gbl_do_not_use_xsdt) {
522 return (TRUE);
523 } else {
524 return (FALSE);
525 }
526 }
527
528 /******************************************************************************
529 *
530 * FUNCTION: osl_table_initialize
531 *
532 * PARAMETERS: None
533 *
534 * RETURN: Status
535 *
536 * DESCRIPTION: Initialize ACPI table data. Get and store main ACPI tables to
537 * local variables. Main ACPI tables include RSDT, FADT, RSDT,
538 * and/or XSDT.
539 *
540 *****************************************************************************/
541
542 static acpi_status osl_table_initialize(void)
543 {
544 acpi_status status;
545 acpi_physical_address address;
546
547 if (gbl_table_list_initialized) {
548 return (AE_OK);
549 }
550
551 if (!gbl_dump_customized_tables) {
552
553 /* Get RSDP from memory */
554
555 status = osl_load_rsdp();
556 if (ACPI_FAILURE(status)) {
557 return (status);
558 }
559
560 /* Get XSDT from memory */
561
562 if (gbl_rsdp.revision && !gbl_do_not_dump_xsdt) {
563 if (gbl_xsdt) {
564 free(gbl_xsdt);
565 gbl_xsdt = NULL;
566 }
567
568 gbl_revision = 2;
569 status = osl_get_bios_table(ACPI_SIG_XSDT, 0,
570 ACPI_CAST_PTR(struct
571 acpi_table_header
572 *, &gbl_xsdt),
573 &address);
574 if (ACPI_FAILURE(status)) {
575 return (status);
576 }
577 }
578
579 /* Get RSDT from memory */
580
581 if (gbl_rsdp.rsdt_physical_address) {
582 if (gbl_rsdt) {
583 free(gbl_rsdt);
584 gbl_rsdt = NULL;
585 }
586
587 status = osl_get_bios_table(ACPI_SIG_RSDT, 0,
588 ACPI_CAST_PTR(struct
589 acpi_table_header
590 *, &gbl_rsdt),
591 &address);
592 if (ACPI_FAILURE(status)) {
593 return (status);
594 }
595 }
596
597 /* Get FADT from memory */
598
599 if (gbl_fadt) {
600 free(gbl_fadt);
601 gbl_fadt = NULL;
602 }
603
604 status = osl_get_bios_table(ACPI_SIG_FADT, 0,
605 ACPI_CAST_PTR(struct
606 acpi_table_header *,
607 &gbl_fadt),
608 &gbl_fadt_address);
609 if (ACPI_FAILURE(status)) {
610 return (status);
611 }
612
613 /* Add mandatory tables to global table list first */
614
615 status = osl_add_table_to_list(ACPI_RSDP_NAME, 0);
616 if (ACPI_FAILURE(status)) {
617 return (status);
618 }
619
620 status = osl_add_table_to_list(ACPI_SIG_RSDT, 0);
621 if (ACPI_FAILURE(status)) {
622 return (status);
623 }
624
625 if (gbl_revision == 2) {
626 status = osl_add_table_to_list(ACPI_SIG_XSDT, 0);
627 if (ACPI_FAILURE(status)) {
628 return (status);
629 }
630 }
631
632 status = osl_add_table_to_list(ACPI_SIG_DSDT, 0);
633 if (ACPI_FAILURE(status)) {
634 return (status);
635 }
636
637 status = osl_add_table_to_list(ACPI_SIG_FACS, 0);
638 if (ACPI_FAILURE(status)) {
639 return (status);
640 }
641
642 /* Add all tables found in the memory */
643
644 status = osl_list_bios_tables();
645 if (ACPI_FAILURE(status)) {
646 return (status);
647 }
648 } else {
649 /* Add all tables found in the static directory */
650
651 status = osl_list_customized_tables(STATIC_TABLE_DIR);
652 if (ACPI_FAILURE(status)) {
653 return (status);
654 }
655 }
656
657 if (gbl_dump_dynamic_tables) {
658
659 /* Add all dynamically loaded tables in the dynamic directory */
660
661 status = osl_list_customized_tables(DYNAMIC_TABLE_DIR);
662 if (ACPI_FAILURE(status)) {
663 return (status);
664 }
665 }
666
667 gbl_table_list_initialized = TRUE;
668 return (AE_OK);
669 }
670
671 /******************************************************************************
672 *
673 * FUNCTION: osl_list_bios_tables
674 *
675 * PARAMETERS: None
676 *
677 * RETURN: Status; Table list is initialized if AE_OK.
678 *
679 * DESCRIPTION: Add ACPI tables to the table list from memory.
680 *
681 * NOTE: This works on Linux as table customization does not modify the
682 * addresses stored in RSDP/RSDT/XSDT/FADT.
683 *
684 *****************************************************************************/
685
686 static acpi_status osl_list_bios_tables(void)
687 {
688 struct acpi_table_header *mapped_table = NULL;
689 u8 *table_data;
690 u8 number_of_tables;
691 u8 item_size;
692 acpi_physical_address table_address = 0;
693 acpi_status status = AE_OK;
694 u32 i;
695
696 if (osl_can_use_xsdt()) {
697 item_size = sizeof(u64);
698 table_data =
699 ACPI_CAST8(gbl_xsdt) + sizeof(struct acpi_table_header);
700 number_of_tables =
701 (u8)((gbl_xsdt->header.length -
702 sizeof(struct acpi_table_header))
703 / item_size);
704 } else { /* Use RSDT if XSDT is not available */
705
706 item_size = sizeof(u32);
707 table_data =
708 ACPI_CAST8(gbl_rsdt) + sizeof(struct acpi_table_header);
709 number_of_tables =
710 (u8)((gbl_rsdt->header.length -
711 sizeof(struct acpi_table_header))
712 / item_size);
713 }
714
715 /* Search RSDT/XSDT for the requested table */
716
717 for (i = 0; i < number_of_tables; ++i, table_data += item_size) {
718 if (osl_can_use_xsdt()) {
719 table_address =
720 (acpi_physical_address)(*ACPI_CAST64(table_data));
721 } else {
722 table_address =
723 (acpi_physical_address)(*ACPI_CAST32(table_data));
724 }
725
726 /* Skip NULL entries in RSDT/XSDT */
727
728 if (table_address == 0) {
729 continue;
730 }
731
732 status = osl_map_table(table_address, NULL, &mapped_table);
733 if (ACPI_FAILURE(status)) {
734 return (status);
735 }
736
737 osl_add_table_to_list(mapped_table->signature, 0);
738 osl_unmap_table(mapped_table);
739 }
740
741 return (AE_OK);
742 }
743
744 /******************************************************************************
745 *
746 * FUNCTION: osl_get_bios_table
747 *
748 * PARAMETERS: signature - ACPI Signature for common table. Must be
749 * a null terminated 4-character string.
750 * instance - Multiple table support for SSDT/UEFI (0...n)
751 * Must be 0 for other tables.
752 * table - Where a pointer to the table is returned
753 * address - Where the table physical address is returned
754 *
755 * RETURN: Status; Table buffer and physical address returned if AE_OK.
756 * AE_LIMIT: Instance is beyond valid limit
757 * AE_NOT_FOUND: A table with the signature was not found
758 *
759 * DESCRIPTION: Get a BIOS provided ACPI table
760 *
761 * NOTE: Assumes the input signature is uppercase.
762 *
763 *****************************************************************************/
764
765 static acpi_status
766 osl_get_bios_table(char *signature,
767 u32 instance,
768 struct acpi_table_header **table,
769 acpi_physical_address *address)
770 {
771 struct acpi_table_header *local_table = NULL;
772 struct acpi_table_header *mapped_table = NULL;
773 u8 *table_data;
774 u8 number_of_tables;
775 u8 item_size;
776 u32 current_instance = 0;
777 acpi_physical_address table_address;
778 acpi_physical_address first_table_address = 0;
779 u32 table_length = 0;
780 acpi_status status = AE_OK;
781 u32 i;
782
783 /* Handle special tables whose addresses are not in RSDT/XSDT */
784
785 if (ACPI_COMPARE_NAMESEG(signature, ACPI_RSDP_NAME) ||
786 ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_RSDT) ||
787 ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_XSDT) ||
788 ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_DSDT) ||
789 ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_FACS)) {
790
791 find_next_instance:
792
793 table_address = 0;
794
795 /*
796 * Get the appropriate address, either 32-bit or 64-bit. Be very
797 * careful about the FADT length and validate table addresses.
798 * Note: The 64-bit addresses have priority.
799 */
800 if (ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_DSDT)) {
801 if (current_instance < 2) {
802 if ((gbl_fadt->header.length >=
803 MIN_FADT_FOR_XDSDT) && gbl_fadt->Xdsdt
804 && current_instance == 0) {
805 table_address =
806 (acpi_physical_address)gbl_fadt->
807 Xdsdt;
808 } else
809 if ((gbl_fadt->header.length >=
810 MIN_FADT_FOR_DSDT)
811 && gbl_fadt->dsdt !=
812 first_table_address) {
813 table_address =
814 (acpi_physical_address)gbl_fadt->
815 dsdt;
816 }
817 }
818 } else if (ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_FACS)) {
819 if (current_instance < 2) {
820 if ((gbl_fadt->header.length >=
821 MIN_FADT_FOR_XFACS) && gbl_fadt->Xfacs
822 && current_instance == 0) {
823 table_address =
824 (acpi_physical_address)gbl_fadt->
825 Xfacs;
826 } else
827 if ((gbl_fadt->header.length >=
828 MIN_FADT_FOR_FACS)
829 && gbl_fadt->facs !=
830 first_table_address) {
831 table_address =
832 (acpi_physical_address)gbl_fadt->
833 facs;
834 }
835 }
836 } else if (ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_XSDT)) {
837 if (!gbl_revision) {
838 return (AE_BAD_SIGNATURE);
839 }
840 if (current_instance == 0) {
841 table_address =
842 (acpi_physical_address)gbl_rsdp.
843 xsdt_physical_address;
844 }
845 } else if (ACPI_COMPARE_NAMESEG(signature, ACPI_SIG_RSDT)) {
846 if (current_instance == 0) {
847 table_address =
848 (acpi_physical_address)gbl_rsdp.
849 rsdt_physical_address;
850 }
851 } else {
852 if (current_instance == 0) {
853 table_address =
854 (acpi_physical_address)gbl_rsdp_address;
855 signature = ACPI_SIG_RSDP;
856 }
857 }
858
859 if (table_address == 0) {
860 goto exit_find_table;
861 }
862
863 /* Now we can get the requested special table */
864
865 status = osl_map_table(table_address, signature, &mapped_table);
866 if (ACPI_FAILURE(status)) {
867 return (status);
868 }
869
870 table_length = ap_get_table_length(mapped_table);
871 if (first_table_address == 0) {
872 first_table_address = table_address;
873 }
874
875 /* Match table instance */
876
877 if (current_instance != instance) {
878 osl_unmap_table(mapped_table);
879 mapped_table = NULL;
880 current_instance++;
881 goto find_next_instance;
882 }
883 } else { /* Case for a normal ACPI table */
884
885 if (osl_can_use_xsdt()) {
886 item_size = sizeof(u64);
887 table_data =
888 ACPI_CAST8(gbl_xsdt) +
889 sizeof(struct acpi_table_header);
890 number_of_tables =
891 (u8)((gbl_xsdt->header.length -
892 sizeof(struct acpi_table_header))
893 / item_size);
894 } else { /* Use RSDT if XSDT is not available */
895
896 item_size = sizeof(u32);
897 table_data =
898 ACPI_CAST8(gbl_rsdt) +
899 sizeof(struct acpi_table_header);
900 number_of_tables =
901 (u8)((gbl_rsdt->header.length -
902 sizeof(struct acpi_table_header))
903 / item_size);
904 }
905
906 /* Search RSDT/XSDT for the requested table */
907
908 for (i = 0; i < number_of_tables; ++i, table_data += item_size) {
909 if (osl_can_use_xsdt()) {
910 table_address =
911 (acpi_physical_address)(*ACPI_CAST64
912 (table_data));
913 } else {
914 table_address =
915 (acpi_physical_address)(*ACPI_CAST32
916 (table_data));
917 }
918
919 /* Skip NULL entries in RSDT/XSDT */
920
921 if (table_address == 0) {
922 continue;
923 }
924
925 status =
926 osl_map_table(table_address, NULL, &mapped_table);
927 if (ACPI_FAILURE(status)) {
928 return (status);
929 }
930 table_length = mapped_table->length;
931
932 /* Does this table match the requested signature? */
933
934 if (!ACPI_COMPARE_NAMESEG
935 (mapped_table->signature, signature)) {
936 osl_unmap_table(mapped_table);
937 mapped_table = NULL;
938 continue;
939 }
940
941 /* Match table instance (for SSDT/UEFI tables) */
942
943 if (current_instance != instance) {
944 osl_unmap_table(mapped_table);
945 mapped_table = NULL;
946 current_instance++;
947 continue;
948 }
949
950 break;
951 }
952 }
953
954 exit_find_table:
955
956 if (!mapped_table) {
957 return (AE_LIMIT);
958 }
959
960 if (table_length == 0) {
961 status = AE_BAD_HEADER;
962 goto exit;
963 }
964
965 /* Copy table to local buffer and return it */
966
967 local_table = calloc(1, table_length);
968 if (!local_table) {
969 status = AE_NO_MEMORY;
970 goto exit;
971 }
972
973 memcpy(local_table, mapped_table, table_length);
974 *address = table_address;
975 *table = local_table;
976
977 exit:
978 osl_unmap_table(mapped_table);
979 return (status);
980 }
981
982 /******************************************************************************
983 *
984 * FUNCTION: osl_list_customized_tables
985 *
986 * PARAMETERS: directory - Directory that contains the tables
987 *
988 * RETURN: Status; Table list is initialized if AE_OK.
989 *
990 * DESCRIPTION: Add ACPI tables to the table list from a directory.
991 *
992 *****************************************************************************/
993
994 static acpi_status osl_list_customized_tables(char *directory)
995 {
996 void *table_dir;
997 u32 instance;
998 char temp_name[ACPI_NAMESEG_SIZE];
999 char *filename;
1000 acpi_status status = AE_OK;
1001
1002 /* Open the requested directory */
1003
1004 table_dir = acpi_os_open_directory(directory, "*", REQUEST_FILE_ONLY);
1005 if (!table_dir) {
1006 return (osl_get_last_status(AE_NOT_FOUND));
1007 }
1008
1009 /* Examine all entries in this directory */
1010
1011 while ((filename = acpi_os_get_next_filename(table_dir))) {
1012
1013 /* Extract table name and instance number */
1014
1015 status =
1016 osl_table_name_from_file(filename, temp_name, &instance);
1017
1018 /* Ignore meaningless files */
1019
1020 if (ACPI_FAILURE(status)) {
1021 continue;
1022 }
1023
1024 /* Add new info node to global table list */
1025
1026 status = osl_add_table_to_list(temp_name, instance);
1027 if (ACPI_FAILURE(status)) {
1028 break;
1029 }
1030 }
1031
1032 acpi_os_close_directory(table_dir);
1033 return (status);
1034 }
1035
1036 /******************************************************************************
1037 *
1038 * FUNCTION: osl_map_table
1039 *
1040 * PARAMETERS: address - Address of the table in memory
1041 * signature - Optional ACPI Signature for desired table.
1042 * Null terminated 4-character string.
1043 * table - Where a pointer to the mapped table is
1044 * returned
1045 *
1046 * RETURN: Status; Mapped table is returned if AE_OK.
1047 * AE_NOT_FOUND: A valid table was not found at the address
1048 *
1049 * DESCRIPTION: Map entire ACPI table into caller's address space.
1050 *
1051 *****************************************************************************/
1052
1053 static acpi_status
1054 osl_map_table(acpi_size address,
1055 char *signature, struct acpi_table_header **table)
1056 {
1057 struct acpi_table_header *mapped_table;
1058 u32 length;
1059
1060 if (!address) {
1061 return (AE_BAD_ADDRESS);
1062 }
1063
1064 /*
1065 * Map the header so we can get the table length.
1066 * Use sizeof (struct acpi_table_header) as:
1067 * 1. it is bigger than 24 to include RSDP->Length
1068 * 2. it is smaller than sizeof (struct acpi_table_rsdp)
1069 */
1070 mapped_table =
1071 acpi_os_map_memory(address, sizeof(struct acpi_table_header));
1072 if (!mapped_table) {
1073 fprintf(stderr, "Could not map table header at 0x%8.8X%8.8X\n",
1074 ACPI_FORMAT_UINT64(address));
1075 return (osl_get_last_status(AE_BAD_ADDRESS));
1076 }
1077
1078 /* If specified, signature must match */
1079
1080 if (signature) {
1081 if (ACPI_VALIDATE_RSDP_SIG(signature)) {
1082 if (!ACPI_VALIDATE_RSDP_SIG(mapped_table->signature)) {
1083 acpi_os_unmap_memory(mapped_table,
1084 sizeof(struct
1085 acpi_table_header));
1086 return (AE_BAD_SIGNATURE);
1087 }
1088 } else
1089 if (!ACPI_COMPARE_NAMESEG
1090 (signature, mapped_table->signature)) {
1091 acpi_os_unmap_memory(mapped_table,
1092 sizeof(struct acpi_table_header));
1093 return (AE_BAD_SIGNATURE);
1094 }
1095 }
1096
1097 /* Map the entire table */
1098
1099 length = ap_get_table_length(mapped_table);
1100 acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
1101 if (length == 0) {
1102 return (AE_BAD_HEADER);
1103 }
1104
1105 mapped_table = acpi_os_map_memory(address, length);
1106 if (!mapped_table) {
1107 fprintf(stderr,
1108 "Could not map table at 0x%8.8X%8.8X length %8.8X\n",
1109 ACPI_FORMAT_UINT64(address), length);
1110 return (osl_get_last_status(AE_INVALID_TABLE_LENGTH));
1111 }
1112
1113 (void)ap_is_valid_checksum(mapped_table);
1114
1115 *table = mapped_table;
1116 return (AE_OK);
1117 }
1118
1119 /******************************************************************************
1120 *
1121 * FUNCTION: osl_unmap_table
1122 *
1123 * PARAMETERS: table - A pointer to the mapped table
1124 *
1125 * RETURN: None
1126 *
1127 * DESCRIPTION: Unmap entire ACPI table.
1128 *
1129 *****************************************************************************/
1130
1131 static void osl_unmap_table(struct acpi_table_header *table)
1132 {
1133 if (table) {
1134 acpi_os_unmap_memory(table, ap_get_table_length(table));
1135 }
1136 }
1137
1138 /******************************************************************************
1139 *
1140 * FUNCTION: osl_table_name_from_file
1141 *
1142 * PARAMETERS: filename - File that contains the desired table
1143 * signature - Pointer to 4-character buffer to store
1144 * extracted table signature.
1145 * instance - Pointer to integer to store extracted
1146 * table instance number.
1147 *
1148 * RETURN: Status; Table name is extracted if AE_OK.
1149 *
1150 * DESCRIPTION: Extract table signature and instance number from a table file
1151 * name.
1152 *
1153 *****************************************************************************/
1154
1155 static acpi_status
1156 osl_table_name_from_file(char *filename, char *signature, u32 *instance)
1157 {
1158
1159 /* Ignore meaningless files */
1160
1161 if (strlen(filename) < ACPI_NAMESEG_SIZE) {
1162 return (AE_BAD_SIGNATURE);
1163 }
1164
1165 /* Extract instance number */
1166
1167 if (isdigit((int)filename[ACPI_NAMESEG_SIZE])) {
1168 sscanf(&filename[ACPI_NAMESEG_SIZE], "%u", instance);
1169 } else if (strlen(filename) != ACPI_NAMESEG_SIZE) {
1170 return (AE_BAD_SIGNATURE);
1171 } else {
1172 *instance = 0;
1173 }
1174
1175 /* Extract signature */
1176
1177 ACPI_COPY_NAMESEG(signature, filename);
1178 return (AE_OK);
1179 }
1180
1181 /******************************************************************************
1182 *
1183 * FUNCTION: osl_read_table_from_file
1184 *
1185 * PARAMETERS: filename - File that contains the desired table
1186 * file_offset - Offset of the table in file
1187 * signature - Optional ACPI Signature for desired table.
1188 * A null terminated 4-character string.
1189 * table - Where a pointer to the table is returned
1190 *
1191 * RETURN: Status; Table buffer is returned if AE_OK.
1192 *
1193 * DESCRIPTION: Read a ACPI table from a file.
1194 *
1195 *****************************************************************************/
1196
1197 static acpi_status
1198 osl_read_table_from_file(char *filename,
1199 acpi_size file_offset,
1200 char *signature, struct acpi_table_header **table)
1201 {
1202 FILE *table_file;
1203 struct acpi_table_header header;
1204 struct acpi_table_header *local_table = NULL;
1205 u32 table_length;
1206 s32 count;
1207 acpi_status status = AE_OK;
1208
1209 /* Open the file */
1210
1211 table_file = fopen(filename, "rb");
1212 if (table_file == NULL) {
1213 fprintf(stderr, "Could not open table file: %s\n", filename);
1214 return (osl_get_last_status(AE_NOT_FOUND));
1215 }
1216
1217 fseek(table_file, file_offset, SEEK_SET);
1218
1219 /* Read the Table header to get the table length */
1220
1221 count = fread(&header, 1, sizeof(struct acpi_table_header), table_file);
1222 if (count != sizeof(struct acpi_table_header)) {
1223 fprintf(stderr, "Could not read table header: %s\n", filename);
1224 status = AE_BAD_HEADER;
1225 goto exit;
1226 }
1227
1228 /* If signature is specified, it must match the table */
1229
1230 if (signature) {
1231 if (ACPI_VALIDATE_RSDP_SIG(signature)) {
1232 if (!ACPI_VALIDATE_RSDP_SIG(header.signature)) {
1233 fprintf(stderr,
1234 "Incorrect RSDP signature: found %8.8s\n",
1235 header.signature);
1236 status = AE_BAD_SIGNATURE;
1237 goto exit;
1238 }
1239 } else if (!ACPI_COMPARE_NAMESEG(signature, header.signature)) {
1240 fprintf(stderr,
1241 "Incorrect signature: Expecting %4.4s, found %4.4s\n",
1242 signature, header.signature);
1243 status = AE_BAD_SIGNATURE;
1244 goto exit;
1245 }
1246 }
1247
1248 table_length = ap_get_table_length(&header);
1249 if (table_length == 0) {
1250 status = AE_BAD_HEADER;
1251 goto exit;
1252 }
1253
1254 /* Read the entire table into a local buffer */
1255
1256 local_table = calloc(1, table_length);
1257 if (!local_table) {
1258 fprintf(stderr,
1259 "%4.4s: Could not allocate buffer for table of length %X\n",
1260 header.signature, table_length);
1261 status = AE_NO_MEMORY;
1262 goto exit;
1263 }
1264
1265 fseek(table_file, file_offset, SEEK_SET);
1266
1267 count = fread(local_table, 1, table_length, table_file);
1268 if (count != table_length) {
1269 fprintf(stderr, "%4.4s: Could not read table content\n",
1270 header.signature);
1271 status = AE_INVALID_TABLE_LENGTH;
1272 goto exit;
1273 }
1274
1275 /* Validate checksum */
1276
1277 (void)ap_is_valid_checksum(local_table);
1278
1279 exit:
1280 fclose(table_file);
1281 *table = local_table;
1282 return (status);
1283 }
1284
1285 /******************************************************************************
1286 *
1287 * FUNCTION: osl_get_customized_table
1288 *
1289 * PARAMETERS: pathname - Directory to find Linux customized table
1290 * signature - ACPI Signature for desired table. Must be
1291 * a null terminated 4-character string.
1292 * instance - Multiple table support for SSDT/UEFI (0...n)
1293 * Must be 0 for other tables.
1294 * table - Where a pointer to the table is returned
1295 * address - Where the table physical address is returned
1296 *
1297 * RETURN: Status; Table buffer is returned if AE_OK.
1298 * AE_LIMIT: Instance is beyond valid limit
1299 * AE_NOT_FOUND: A table with the signature was not found
1300 *
1301 * DESCRIPTION: Get an OS customized table.
1302 *
1303 *****************************************************************************/
1304
1305 static acpi_status
1306 osl_get_customized_table(char *pathname,
1307 char *signature,
1308 u32 instance,
1309 struct acpi_table_header **table,
1310 acpi_physical_address *address)
1311 {
1312 void *table_dir;
1313 u32 current_instance = 0;
1314 char temp_name[ACPI_NAMESEG_SIZE];
1315 char table_filename[PATH_MAX];
1316 char *filename;
1317 acpi_status status;
1318
1319 /* Open the directory for customized tables */
1320
1321 table_dir = acpi_os_open_directory(pathname, "*", REQUEST_FILE_ONLY);
1322 if (!table_dir) {
1323 return (osl_get_last_status(AE_NOT_FOUND));
1324 }
1325
1326 /* Attempt to find the table in the directory */
1327
1328 while ((filename = acpi_os_get_next_filename(table_dir))) {
1329
1330 /* Ignore meaningless files */
1331
1332 if (!ACPI_COMPARE_NAMESEG(filename, signature)) {
1333 continue;
1334 }
1335
1336 /* Extract table name and instance number */
1337
1338 status =
1339 osl_table_name_from_file(filename, temp_name,
1340 ¤t_instance);
1341
1342 /* Ignore meaningless files */
1343
1344 if (ACPI_FAILURE(status) || current_instance != instance) {
1345 continue;
1346 }
1347
1348 /* Create the table pathname */
1349
1350 if (instance != 0) {
1351 sprintf(table_filename, "%s/%4.4s%d", pathname,
1352 temp_name, instance);
1353 } else {
1354 sprintf(table_filename, "%s/%4.4s", pathname,
1355 temp_name);
1356 }
1357 break;
1358 }
1359
1360 acpi_os_close_directory(table_dir);
1361
1362 if (!filename) {
1363 return (AE_LIMIT);
1364 }
1365
1366 /* There is no physical address saved for customized tables, use zero */
1367
1368 *address = 0;
1369 status = osl_read_table_from_file(table_filename, 0, NULL, table);
1370
1371 return (status);
1372 }