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1/******************************************************************************
2 *
3 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acinterp.h"
47#include "acnamesp.h"
48#include "actables.h"
49#include "acdispat.h"
50#include "acevents.h"
51
52#define _COMPONENT ACPI_EXECUTER
53ACPI_MODULE_NAME("exconfig")
54
55/* Local prototypes */
56static acpi_status
57acpi_ex_add_table(u32 table_index,
58 struct acpi_namespace_node *parent_node,
59 union acpi_operand_object **ddb_handle);
60
61static acpi_status
62acpi_ex_region_read(union acpi_operand_object *obj_desc,
63 u32 length, u8 *buffer);
64
65/*******************************************************************************
66 *
67 * FUNCTION: acpi_ex_add_table
68 *
69 * PARAMETERS: Table - Pointer to raw table
70 * parent_node - Where to load the table (scope)
71 * ddb_handle - Where to return the table handle.
72 *
73 * RETURN: Status
74 *
75 * DESCRIPTION: Common function to Install and Load an ACPI table with a
76 * returned table handle.
77 *
78 ******************************************************************************/
79
80static acpi_status
81acpi_ex_add_table(u32 table_index,
82 struct acpi_namespace_node *parent_node,
83 union acpi_operand_object **ddb_handle)
84{
85 union acpi_operand_object *obj_desc;
86 acpi_status status;
87 acpi_owner_id owner_id;
88
89 ACPI_FUNCTION_TRACE(ex_add_table);
90
91 /* Create an object to be the table handle */
92
93 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
94 if (!obj_desc) {
95 return_ACPI_STATUS(AE_NO_MEMORY);
96 }
97
98 /* Init the table handle */
99
100 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
101 obj_desc->reference.class = ACPI_REFCLASS_TABLE;
102 *ddb_handle = obj_desc;
103
104 /* Install the new table into the local data structures */
105
106 obj_desc->reference.value = table_index;
107
108 /* Add the table to the namespace */
109
110 status = acpi_ns_load_table(table_index, parent_node);
111 if (ACPI_FAILURE(status)) {
112 acpi_ut_remove_reference(obj_desc);
113 *ddb_handle = NULL;
114 return_ACPI_STATUS(status);
115 }
116
117 /* Execute any module-level code that was found in the table */
118
119 acpi_ex_exit_interpreter();
120 acpi_ns_exec_module_code_list();
121 acpi_ex_enter_interpreter();
122
123 /* Update GPEs for any new _Lxx/_Exx methods. Ignore errors */
124
125 status = acpi_tb_get_owner_id(table_index, &owner_id);
126 if (ACPI_SUCCESS(status)) {
127 acpi_ev_update_gpes(owner_id);
128 }
129
130 return_ACPI_STATUS(AE_OK);
131}
132
133/*******************************************************************************
134 *
135 * FUNCTION: acpi_ex_load_table_op
136 *
137 * PARAMETERS: walk_state - Current state with operands
138 * return_desc - Where to store the return object
139 *
140 * RETURN: Status
141 *
142 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
143 *
144 ******************************************************************************/
145
146acpi_status
147acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
148 union acpi_operand_object **return_desc)
149{
150 acpi_status status;
151 union acpi_operand_object **operand = &walk_state->operands[0];
152 struct acpi_namespace_node *parent_node;
153 struct acpi_namespace_node *start_node;
154 struct acpi_namespace_node *parameter_node = NULL;
155 union acpi_operand_object *ddb_handle;
156 struct acpi_table_header *table;
157 u32 table_index;
158
159 ACPI_FUNCTION_TRACE(ex_load_table_op);
160
161 /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
162
163 if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
164 (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
165 (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
166 return_ACPI_STATUS(AE_BAD_PARAMETER);
167 }
168
169 /* Find the ACPI table in the RSDT/XSDT */
170
171 status = acpi_tb_find_table(operand[0]->string.pointer,
172 operand[1]->string.pointer,
173 operand[2]->string.pointer, &table_index);
174 if (ACPI_FAILURE(status)) {
175 if (status != AE_NOT_FOUND) {
176 return_ACPI_STATUS(status);
177 }
178
179 /* Table not found, return an Integer=0 and AE_OK */
180
181 ddb_handle = acpi_ut_create_integer_object((u64) 0);
182 if (!ddb_handle) {
183 return_ACPI_STATUS(AE_NO_MEMORY);
184 }
185
186 *return_desc = ddb_handle;
187 return_ACPI_STATUS(AE_OK);
188 }
189
190 /* Default nodes */
191
192 start_node = walk_state->scope_info->scope.node;
193 parent_node = acpi_gbl_root_node;
194
195 /* root_path (optional parameter) */
196
197 if (operand[3]->string.length > 0) {
198 /*
199 * Find the node referenced by the root_path_string. This is the
200 * location within the namespace where the table will be loaded.
201 */
202 status =
203 acpi_ns_get_node(start_node, operand[3]->string.pointer,
204 ACPI_NS_SEARCH_PARENT, &parent_node);
205 if (ACPI_FAILURE(status)) {
206 return_ACPI_STATUS(status);
207 }
208 }
209
210 /* parameter_path (optional parameter) */
211
212 if (operand[4]->string.length > 0) {
213 if ((operand[4]->string.pointer[0] != '\\') &&
214 (operand[4]->string.pointer[0] != '^')) {
215 /*
216 * Path is not absolute, so it will be relative to the node
217 * referenced by the root_path_string (or the NS root if omitted)
218 */
219 start_node = parent_node;
220 }
221
222 /* Find the node referenced by the parameter_path_string */
223
224 status =
225 acpi_ns_get_node(start_node, operand[4]->string.pointer,
226 ACPI_NS_SEARCH_PARENT, ¶meter_node);
227 if (ACPI_FAILURE(status)) {
228 return_ACPI_STATUS(status);
229 }
230 }
231
232 /* Load the table into the namespace */
233
234 status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
235 if (ACPI_FAILURE(status)) {
236 return_ACPI_STATUS(status);
237 }
238
239 /* Parameter Data (optional) */
240
241 if (parameter_node) {
242
243 /* Store the parameter data into the optional parameter object */
244
245 status = acpi_ex_store(operand[5],
246 ACPI_CAST_PTR(union acpi_operand_object,
247 parameter_node),
248 walk_state);
249 if (ACPI_FAILURE(status)) {
250 (void)acpi_ex_unload_table(ddb_handle);
251
252 acpi_ut_remove_reference(ddb_handle);
253 return_ACPI_STATUS(status);
254 }
255 }
256
257 status = acpi_get_table_by_index(table_index, &table);
258 if (ACPI_SUCCESS(status)) {
259 ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
260 acpi_tb_print_table_header(0, table);
261 }
262
263 /* Invoke table handler if present */
264
265 if (acpi_gbl_table_handler) {
266 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
267 acpi_gbl_table_handler_context);
268 }
269
270 *return_desc = ddb_handle;
271 return_ACPI_STATUS(status);
272}
273
274/*******************************************************************************
275 *
276 * FUNCTION: acpi_ex_region_read
277 *
278 * PARAMETERS: obj_desc - Region descriptor
279 * Length - Number of bytes to read
280 * Buffer - Pointer to where to put the data
281 *
282 * RETURN: Status
283 *
284 * DESCRIPTION: Read data from an operation region. The read starts from the
285 * beginning of the region.
286 *
287 ******************************************************************************/
288
289static acpi_status
290acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
291{
292 acpi_status status;
293 u64 value;
294 u32 region_offset = 0;
295 u32 i;
296
297 /* Bytewise reads */
298
299 for (i = 0; i < length; i++) {
300 status = acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
301 region_offset, 8,
302 &value);
303 if (ACPI_FAILURE(status)) {
304 return status;
305 }
306
307 *buffer = (u8)value;
308 buffer++;
309 region_offset++;
310 }
311
312 return AE_OK;
313}
314
315/*******************************************************************************
316 *
317 * FUNCTION: acpi_ex_load_op
318 *
319 * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
320 * obtained
321 * Target - Where a handle to the table will be stored
322 * walk_state - Current state
323 *
324 * RETURN: Status
325 *
326 * DESCRIPTION: Load an ACPI table from a field or operation region
327 *
328 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
329 * objects before this code is reached.
330 *
331 * If source is an operation region, it must refer to system_memory, as
332 * per the ACPI specification.
333 *
334 ******************************************************************************/
335
336acpi_status
337acpi_ex_load_op(union acpi_operand_object *obj_desc,
338 union acpi_operand_object *target,
339 struct acpi_walk_state *walk_state)
340{
341 union acpi_operand_object *ddb_handle;
342 struct acpi_table_header *table;
343 struct acpi_table_desc table_desc;
344 u32 table_index;
345 acpi_status status;
346 u32 length;
347
348 ACPI_FUNCTION_TRACE(ex_load_op);
349
350 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
351
352 /* Source Object can be either an op_region or a Buffer/Field */
353
354 switch (obj_desc->common.type) {
355 case ACPI_TYPE_REGION:
356
357 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
358 "Load table from Region %p\n", obj_desc));
359
360 /* Region must be system_memory (from ACPI spec) */
361
362 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
363 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
364 }
365
366 /*
367 * If the Region Address and Length have not been previously evaluated,
368 * evaluate them now and save the results.
369 */
370 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
371 status = acpi_ds_get_region_arguments(obj_desc);
372 if (ACPI_FAILURE(status)) {
373 return_ACPI_STATUS(status);
374 }
375 }
376
377 /* Get the table header first so we can get the table length */
378
379 table = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
380 if (!table) {
381 return_ACPI_STATUS(AE_NO_MEMORY);
382 }
383
384 status =
385 acpi_ex_region_read(obj_desc,
386 sizeof(struct acpi_table_header),
387 ACPI_CAST_PTR(u8, table));
388 length = table->length;
389 ACPI_FREE(table);
390
391 if (ACPI_FAILURE(status)) {
392 return_ACPI_STATUS(status);
393 }
394
395 /* Must have at least an ACPI table header */
396
397 if (length < sizeof(struct acpi_table_header)) {
398 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
399 }
400
401 /*
402 * The original implementation simply mapped the table, with no copy.
403 * However, the memory region is not guaranteed to remain stable and
404 * we must copy the table to a local buffer. For example, the memory
405 * region is corrupted after suspend on some machines. Dynamically
406 * loaded tables are usually small, so this overhead is minimal.
407 *
408 * The latest implementation (5/2009) does not use a mapping at all.
409 * We use the low-level operation region interface to read the table
410 * instead of the obvious optimization of using a direct mapping.
411 * This maintains a consistent use of operation regions across the
412 * entire subsystem. This is important if additional processing must
413 * be performed in the (possibly user-installed) operation region
414 * handler. For example, acpi_exec and ASLTS depend on this.
415 */
416
417 /* Allocate a buffer for the table */
418
419 table_desc.pointer = ACPI_ALLOCATE(length);
420 if (!table_desc.pointer) {
421 return_ACPI_STATUS(AE_NO_MEMORY);
422 }
423
424 /* Read the entire table */
425
426 status = acpi_ex_region_read(obj_desc, length,
427 ACPI_CAST_PTR(u8,
428 table_desc.pointer));
429 if (ACPI_FAILURE(status)) {
430 ACPI_FREE(table_desc.pointer);
431 return_ACPI_STATUS(status);
432 }
433
434 table_desc.address = obj_desc->region.address;
435 break;
436
437 case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
438
439 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
440 "Load table from Buffer or Field %p\n",
441 obj_desc));
442
443 /* Must have at least an ACPI table header */
444
445 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
446 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
447 }
448
449 /* Get the actual table length from the table header */
450
451 table =
452 ACPI_CAST_PTR(struct acpi_table_header,
453 obj_desc->buffer.pointer);
454 length = table->length;
455
456 /* Table cannot extend beyond the buffer */
457
458 if (length > obj_desc->buffer.length) {
459 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
460 }
461 if (length < sizeof(struct acpi_table_header)) {
462 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
463 }
464
465 /*
466 * Copy the table from the buffer because the buffer could be modified
467 * or even deleted in the future
468 */
469 table_desc.pointer = ACPI_ALLOCATE(length);
470 if (!table_desc.pointer) {
471 return_ACPI_STATUS(AE_NO_MEMORY);
472 }
473
474 ACPI_MEMCPY(table_desc.pointer, table, length);
475 table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
476 break;
477
478 default:
479 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
480 }
481
482 /* Validate table checksum (will not get validated in tb_add_table) */
483
484 status = acpi_tb_verify_checksum(table_desc.pointer, length);
485 if (ACPI_FAILURE(status)) {
486 ACPI_FREE(table_desc.pointer);
487 return_ACPI_STATUS(status);
488 }
489
490 /* Complete the table descriptor */
491
492 table_desc.length = length;
493 table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
494
495 /* Install the new table into the local data structures */
496
497 status = acpi_tb_add_table(&table_desc, &table_index);
498 if (ACPI_FAILURE(status)) {
499
500 /* Delete allocated table buffer */
501
502 acpi_tb_delete_table(&table_desc);
503 return_ACPI_STATUS(status);
504 }
505
506 /*
507 * Add the table to the namespace.
508 *
509 * Note: Load the table objects relative to the root of the namespace.
510 * This appears to go against the ACPI specification, but we do it for
511 * compatibility with other ACPI implementations.
512 */
513 status =
514 acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
515 if (ACPI_FAILURE(status)) {
516
517 /* On error, table_ptr was deallocated above */
518
519 return_ACPI_STATUS(status);
520 }
521
522 /* Store the ddb_handle into the Target operand */
523
524 status = acpi_ex_store(ddb_handle, target, walk_state);
525 if (ACPI_FAILURE(status)) {
526 (void)acpi_ex_unload_table(ddb_handle);
527
528 /* table_ptr was deallocated above */
529
530 acpi_ut_remove_reference(ddb_handle);
531 return_ACPI_STATUS(status);
532 }
533
534 ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
535 acpi_tb_print_table_header(0, table_desc.pointer);
536
537 /* Remove the reference by added by acpi_ex_store above */
538
539 acpi_ut_remove_reference(ddb_handle);
540
541 /* Invoke table handler if present */
542
543 if (acpi_gbl_table_handler) {
544 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
545 table_desc.pointer,
546 acpi_gbl_table_handler_context);
547 }
548
549 return_ACPI_STATUS(status);
550}
551
552/*******************************************************************************
553 *
554 * FUNCTION: acpi_ex_unload_table
555 *
556 * PARAMETERS: ddb_handle - Handle to a previously loaded table
557 *
558 * RETURN: Status
559 *
560 * DESCRIPTION: Unload an ACPI table
561 *
562 ******************************************************************************/
563
564acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
565{
566 acpi_status status = AE_OK;
567 union acpi_operand_object *table_desc = ddb_handle;
568 u32 table_index;
569 struct acpi_table_header *table;
570
571 ACPI_FUNCTION_TRACE(ex_unload_table);
572
573 /*
574 * Validate the handle
575 * Although the handle is partially validated in acpi_ex_reconfiguration()
576 * when it calls acpi_ex_resolve_operands(), the handle is more completely
577 * validated here.
578 *
579 * Handle must be a valid operand object of type reference. Also, the
580 * ddb_handle must still be marked valid (table has not been previously
581 * unloaded)
582 */
583 if ((!ddb_handle) ||
584 (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
585 (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
586 (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
587 return_ACPI_STATUS(AE_BAD_PARAMETER);
588 }
589
590 /* Get the table index from the ddb_handle */
591
592 table_index = table_desc->reference.value;
593
594 /* Ensure the table is still loaded */
595
596 if (!acpi_tb_is_table_loaded(table_index)) {
597 return_ACPI_STATUS(AE_NOT_EXIST);
598 }
599
600 /* Invoke table handler if present */
601
602 if (acpi_gbl_table_handler) {
603 status = acpi_get_table_by_index(table_index, &table);
604 if (ACPI_SUCCESS(status)) {
605 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
606 table,
607 acpi_gbl_table_handler_context);
608 }
609 }
610
611 /* Delete the portion of the namespace owned by this table */
612
613 status = acpi_tb_delete_namespace_by_owner(table_index);
614 if (ACPI_FAILURE(status)) {
615 return_ACPI_STATUS(status);
616 }
617
618 (void)acpi_tb_release_owner_id(table_index);
619 acpi_tb_set_table_loaded_flag(table_index, FALSE);
620
621 /*
622 * Invalidate the handle. We do this because the handle may be stored
623 * in a named object and may not be actually deleted until much later.
624 */
625 ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
626 return_ACPI_STATUS(AE_OK);
627}
1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
5 *
6 * Copyright (C) 2000 - 2018, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acinterp.h"
13#include "acnamesp.h"
14#include "actables.h"
15#include "acdispat.h"
16#include "acevents.h"
17#include "amlcode.h"
18
19#define _COMPONENT ACPI_EXECUTER
20ACPI_MODULE_NAME("exconfig")
21
22/* Local prototypes */
23static acpi_status
24acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle);
25
26static acpi_status
27acpi_ex_region_read(union acpi_operand_object *obj_desc,
28 u32 length, u8 *buffer);
29
30/*******************************************************************************
31 *
32 * FUNCTION: acpi_ex_add_table
33 *
34 * PARAMETERS: table - Pointer to raw table
35 * parent_node - Where to load the table (scope)
36 * ddb_handle - Where to return the table handle.
37 *
38 * RETURN: Status
39 *
40 * DESCRIPTION: Common function to Install and Load an ACPI table with a
41 * returned table handle.
42 *
43 ******************************************************************************/
44
45static acpi_status
46acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle)
47{
48 union acpi_operand_object *obj_desc;
49
50 ACPI_FUNCTION_TRACE(ex_add_table);
51
52 /* Create an object to be the table handle */
53
54 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
55 if (!obj_desc) {
56 return_ACPI_STATUS(AE_NO_MEMORY);
57 }
58
59 /* Init the table handle */
60
61 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
62 obj_desc->reference.class = ACPI_REFCLASS_TABLE;
63 obj_desc->reference.value = table_index;
64 *ddb_handle = obj_desc;
65 return_ACPI_STATUS(AE_OK);
66}
67
68/*******************************************************************************
69 *
70 * FUNCTION: acpi_ex_load_table_op
71 *
72 * PARAMETERS: walk_state - Current state with operands
73 * return_desc - Where to store the return object
74 *
75 * RETURN: Status
76 *
77 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
78 *
79 ******************************************************************************/
80
81acpi_status
82acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
83 union acpi_operand_object **return_desc)
84{
85 acpi_status status;
86 union acpi_operand_object **operand = &walk_state->operands[0];
87 struct acpi_namespace_node *parent_node;
88 struct acpi_namespace_node *start_node;
89 struct acpi_namespace_node *parameter_node = NULL;
90 union acpi_operand_object *ddb_handle;
91 u32 table_index;
92
93 ACPI_FUNCTION_TRACE(ex_load_table_op);
94
95 /* Find the ACPI table in the RSDT/XSDT */
96
97 acpi_ex_exit_interpreter();
98 status = acpi_tb_find_table(operand[0]->string.pointer,
99 operand[1]->string.pointer,
100 operand[2]->string.pointer, &table_index);
101 acpi_ex_enter_interpreter();
102 if (ACPI_FAILURE(status)) {
103 if (status != AE_NOT_FOUND) {
104 return_ACPI_STATUS(status);
105 }
106
107 /* Table not found, return an Integer=0 and AE_OK */
108
109 ddb_handle = acpi_ut_create_integer_object((u64) 0);
110 if (!ddb_handle) {
111 return_ACPI_STATUS(AE_NO_MEMORY);
112 }
113
114 *return_desc = ddb_handle;
115 return_ACPI_STATUS(AE_OK);
116 }
117
118 /* Default nodes */
119
120 start_node = walk_state->scope_info->scope.node;
121 parent_node = acpi_gbl_root_node;
122
123 /* root_path (optional parameter) */
124
125 if (operand[3]->string.length > 0) {
126 /*
127 * Find the node referenced by the root_path_string. This is the
128 * location within the namespace where the table will be loaded.
129 */
130 status = acpi_ns_get_node_unlocked(start_node,
131 operand[3]->string.pointer,
132 ACPI_NS_SEARCH_PARENT,
133 &parent_node);
134 if (ACPI_FAILURE(status)) {
135 return_ACPI_STATUS(status);
136 }
137 }
138
139 /* parameter_path (optional parameter) */
140
141 if (operand[4]->string.length > 0) {
142 if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
143 (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
144 /*
145 * Path is not absolute, so it will be relative to the node
146 * referenced by the root_path_string (or the NS root if omitted)
147 */
148 start_node = parent_node;
149 }
150
151 /* Find the node referenced by the parameter_path_string */
152
153 status = acpi_ns_get_node_unlocked(start_node,
154 operand[4]->string.pointer,
155 ACPI_NS_SEARCH_PARENT,
156 ¶meter_node);
157 if (ACPI_FAILURE(status)) {
158 return_ACPI_STATUS(status);
159 }
160 }
161
162 /* Load the table into the namespace */
163
164 ACPI_INFO(("Dynamic OEM Table Load:"));
165 acpi_ex_exit_interpreter();
166 status = acpi_tb_load_table(table_index, parent_node);
167 acpi_ex_enter_interpreter();
168 if (ACPI_FAILURE(status)) {
169 return_ACPI_STATUS(status);
170 }
171
172 status = acpi_ex_add_table(table_index, &ddb_handle);
173 if (ACPI_FAILURE(status)) {
174 return_ACPI_STATUS(status);
175 }
176
177 /* Complete the initialization/resolution of package objects */
178
179 status = acpi_ns_walk_namespace(ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT,
180 ACPI_UINT32_MAX, 0,
181 acpi_ns_init_one_package, NULL, NULL,
182 NULL);
183
184 /* Parameter Data (optional) */
185
186 if (parameter_node) {
187
188 /* Store the parameter data into the optional parameter object */
189
190 status = acpi_ex_store(operand[5],
191 ACPI_CAST_PTR(union acpi_operand_object,
192 parameter_node),
193 walk_state);
194 if (ACPI_FAILURE(status)) {
195 (void)acpi_ex_unload_table(ddb_handle);
196
197 acpi_ut_remove_reference(ddb_handle);
198 return_ACPI_STATUS(status);
199 }
200 }
201
202 *return_desc = ddb_handle;
203 return_ACPI_STATUS(status);
204}
205
206/*******************************************************************************
207 *
208 * FUNCTION: acpi_ex_region_read
209 *
210 * PARAMETERS: obj_desc - Region descriptor
211 * length - Number of bytes to read
212 * buffer - Pointer to where to put the data
213 *
214 * RETURN: Status
215 *
216 * DESCRIPTION: Read data from an operation region. The read starts from the
217 * beginning of the region.
218 *
219 ******************************************************************************/
220
221static acpi_status
222acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
223{
224 acpi_status status;
225 u64 value;
226 u32 region_offset = 0;
227 u32 i;
228
229 /* Bytewise reads */
230
231 for (i = 0; i < length; i++) {
232 status =
233 acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
234 region_offset, 8, &value);
235 if (ACPI_FAILURE(status)) {
236 return (status);
237 }
238
239 *buffer = (u8)value;
240 buffer++;
241 region_offset++;
242 }
243
244 return (AE_OK);
245}
246
247/*******************************************************************************
248 *
249 * FUNCTION: acpi_ex_load_op
250 *
251 * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
252 * obtained
253 * target - Where a handle to the table will be stored
254 * walk_state - Current state
255 *
256 * RETURN: Status
257 *
258 * DESCRIPTION: Load an ACPI table from a field or operation region
259 *
260 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
261 * objects before this code is reached.
262 *
263 * If source is an operation region, it must refer to system_memory, as
264 * per the ACPI specification.
265 *
266 ******************************************************************************/
267
268acpi_status
269acpi_ex_load_op(union acpi_operand_object *obj_desc,
270 union acpi_operand_object *target,
271 struct acpi_walk_state *walk_state)
272{
273 union acpi_operand_object *ddb_handle;
274 struct acpi_table_header *table_header;
275 struct acpi_table_header *table;
276 u32 table_index;
277 acpi_status status;
278 u32 length;
279
280 ACPI_FUNCTION_TRACE(ex_load_op);
281
282 /* Source Object can be either an op_region or a Buffer/Field */
283
284 switch (obj_desc->common.type) {
285 case ACPI_TYPE_REGION:
286
287 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
288 "Load table from Region %p\n", obj_desc));
289
290 /* Region must be system_memory (from ACPI spec) */
291
292 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
293 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
294 }
295
296 /*
297 * If the Region Address and Length have not been previously
298 * evaluated, evaluate them now and save the results.
299 */
300 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
301 status = acpi_ds_get_region_arguments(obj_desc);
302 if (ACPI_FAILURE(status)) {
303 return_ACPI_STATUS(status);
304 }
305 }
306
307 /* Get the table header first so we can get the table length */
308
309 table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
310 if (!table_header) {
311 return_ACPI_STATUS(AE_NO_MEMORY);
312 }
313
314 status =
315 acpi_ex_region_read(obj_desc,
316 sizeof(struct acpi_table_header),
317 ACPI_CAST_PTR(u8, table_header));
318 length = table_header->length;
319 ACPI_FREE(table_header);
320
321 if (ACPI_FAILURE(status)) {
322 return_ACPI_STATUS(status);
323 }
324
325 /* Must have at least an ACPI table header */
326
327 if (length < sizeof(struct acpi_table_header)) {
328 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
329 }
330
331 /*
332 * The original implementation simply mapped the table, with no copy.
333 * However, the memory region is not guaranteed to remain stable and
334 * we must copy the table to a local buffer. For example, the memory
335 * region is corrupted after suspend on some machines. Dynamically
336 * loaded tables are usually small, so this overhead is minimal.
337 *
338 * The latest implementation (5/2009) does not use a mapping at all.
339 * We use the low-level operation region interface to read the table
340 * instead of the obvious optimization of using a direct mapping.
341 * This maintains a consistent use of operation regions across the
342 * entire subsystem. This is important if additional processing must
343 * be performed in the (possibly user-installed) operation region
344 * handler. For example, acpi_exec and ASLTS depend on this.
345 */
346
347 /* Allocate a buffer for the table */
348
349 table = ACPI_ALLOCATE(length);
350 if (!table) {
351 return_ACPI_STATUS(AE_NO_MEMORY);
352 }
353
354 /* Read the entire table */
355
356 status = acpi_ex_region_read(obj_desc, length,
357 ACPI_CAST_PTR(u8, table));
358 if (ACPI_FAILURE(status)) {
359 ACPI_FREE(table);
360 return_ACPI_STATUS(status);
361 }
362 break;
363
364 case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
365
366 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
367 "Load table from Buffer or Field %p\n",
368 obj_desc));
369
370 /* Must have at least an ACPI table header */
371
372 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
373 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
374 }
375
376 /* Get the actual table length from the table header */
377
378 table_header =
379 ACPI_CAST_PTR(struct acpi_table_header,
380 obj_desc->buffer.pointer);
381 length = table_header->length;
382
383 /* Table cannot extend beyond the buffer */
384
385 if (length > obj_desc->buffer.length) {
386 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
387 }
388 if (length < sizeof(struct acpi_table_header)) {
389 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
390 }
391
392 /*
393 * Copy the table from the buffer because the buffer could be
394 * modified or even deleted in the future
395 */
396 table = ACPI_ALLOCATE(length);
397 if (!table) {
398 return_ACPI_STATUS(AE_NO_MEMORY);
399 }
400
401 memcpy(table, table_header, length);
402 break;
403
404 default:
405
406 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
407 }
408
409 /* Install the new table into the local data structures */
410
411 ACPI_INFO(("Dynamic OEM Table Load:"));
412 acpi_ex_exit_interpreter();
413 status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
414 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
415 TRUE, &table_index);
416 acpi_ex_enter_interpreter();
417 if (ACPI_FAILURE(status)) {
418
419 /* Delete allocated table buffer */
420
421 ACPI_FREE(table);
422 return_ACPI_STATUS(status);
423 }
424
425 /*
426 * Add the table to the namespace.
427 *
428 * Note: Load the table objects relative to the root of the namespace.
429 * This appears to go against the ACPI specification, but we do it for
430 * compatibility with other ACPI implementations.
431 */
432 status = acpi_ex_add_table(table_index, &ddb_handle);
433 if (ACPI_FAILURE(status)) {
434
435 /* On error, table_ptr was deallocated above */
436
437 return_ACPI_STATUS(status);
438 }
439
440 /* Complete the initialization/resolution of package objects */
441
442 status = acpi_ns_walk_namespace(ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT,
443 ACPI_UINT32_MAX, 0,
444 acpi_ns_init_one_package, NULL, NULL,
445 NULL);
446
447 /* Store the ddb_handle into the Target operand */
448
449 status = acpi_ex_store(ddb_handle, target, walk_state);
450 if (ACPI_FAILURE(status)) {
451 (void)acpi_ex_unload_table(ddb_handle);
452
453 /* table_ptr was deallocated above */
454
455 acpi_ut_remove_reference(ddb_handle);
456 return_ACPI_STATUS(status);
457 }
458
459 /* Remove the reference by added by acpi_ex_store above */
460
461 acpi_ut_remove_reference(ddb_handle);
462 return_ACPI_STATUS(status);
463}
464
465/*******************************************************************************
466 *
467 * FUNCTION: acpi_ex_unload_table
468 *
469 * PARAMETERS: ddb_handle - Handle to a previously loaded table
470 *
471 * RETURN: Status
472 *
473 * DESCRIPTION: Unload an ACPI table
474 *
475 ******************************************************************************/
476
477acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
478{
479 acpi_status status = AE_OK;
480 union acpi_operand_object *table_desc = ddb_handle;
481 u32 table_index;
482
483 ACPI_FUNCTION_TRACE(ex_unload_table);
484
485 /*
486 * Temporarily emit a warning so that the ASL for the machine can be
487 * hopefully obtained. This is to say that the Unload() operator is
488 * extremely rare if not completely unused.
489 */
490 ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
491
492 /*
493 * Validate the handle
494 * Although the handle is partially validated in acpi_ex_reconfiguration()
495 * when it calls acpi_ex_resolve_operands(), the handle is more completely
496 * validated here.
497 *
498 * Handle must be a valid operand object of type reference. Also, the
499 * ddb_handle must still be marked valid (table has not been previously
500 * unloaded)
501 */
502 if ((!ddb_handle) ||
503 (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
504 (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
505 (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
506 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
507 }
508
509 /* Get the table index from the ddb_handle */
510
511 table_index = table_desc->reference.value;
512
513 /*
514 * Release the interpreter lock so that the table lock won't have
515 * strict order requirement against it.
516 */
517 acpi_ex_exit_interpreter();
518 status = acpi_tb_unload_table(table_index);
519 acpi_ex_enter_interpreter();
520
521 /*
522 * Invalidate the handle. We do this because the handle may be stored
523 * in a named object and may not be actually deleted until much later.
524 */
525 if (ACPI_SUCCESS(status)) {
526 ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
527 }
528 return_ACPI_STATUS(status);
529}