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-rw-r--r--drivers/acpi/acpica/exconfig.c536
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diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c
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+++ b/drivers/acpi/acpica/exconfig.c
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1/******************************************************************************
2 *
3 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
46#include <acpi/acinterp.h>
47#include <acpi/acnamesp.h>
48#include <acpi/actables.h>
49#include <acpi/acdispat.h>
50
51#define _COMPONENT ACPI_EXECUTER
52ACPI_MODULE_NAME("exconfig")
53
54/* Local prototypes */
55static acpi_status
56acpi_ex_add_table(u32 table_index,
57 struct acpi_namespace_node *parent_node,
58 union acpi_operand_object **ddb_handle);
59
60/*******************************************************************************
61 *
62 * FUNCTION: acpi_ex_add_table
63 *
64 * PARAMETERS: Table - Pointer to raw table
65 * parent_node - Where to load the table (scope)
66 * ddb_handle - Where to return the table handle.
67 *
68 * RETURN: Status
69 *
70 * DESCRIPTION: Common function to Install and Load an ACPI table with a
71 * returned table handle.
72 *
73 ******************************************************************************/
74
75static acpi_status
76acpi_ex_add_table(u32 table_index,
77 struct acpi_namespace_node *parent_node,
78 union acpi_operand_object **ddb_handle)
79{
80 acpi_status status;
81 union acpi_operand_object *obj_desc;
82
83 ACPI_FUNCTION_TRACE(ex_add_table);
84
85 /* Create an object to be the table handle */
86
87 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
88 if (!obj_desc) {
89 return_ACPI_STATUS(AE_NO_MEMORY);
90 }
91
92 /* Init the table handle */
93
94 obj_desc->reference.class = ACPI_REFCLASS_TABLE;
95 *ddb_handle = obj_desc;
96
97 /* Install the new table into the local data structures */
98
99 obj_desc->reference.value = table_index;
100
101 /* Add the table to the namespace */
102
103 status = acpi_ns_load_table(table_index, parent_node);
104 if (ACPI_FAILURE(status)) {
105 acpi_ut_remove_reference(obj_desc);
106 *ddb_handle = NULL;
107 }
108
109 return_ACPI_STATUS(status);
110}
111
112/*******************************************************************************
113 *
114 * FUNCTION: acpi_ex_load_table_op
115 *
116 * PARAMETERS: walk_state - Current state with operands
117 * return_desc - Where to store the return object
118 *
119 * RETURN: Status
120 *
121 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
122 *
123 ******************************************************************************/
124
125acpi_status
126acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
127 union acpi_operand_object **return_desc)
128{
129 acpi_status status;
130 union acpi_operand_object **operand = &walk_state->operands[0];
131 struct acpi_namespace_node *parent_node;
132 struct acpi_namespace_node *start_node;
133 struct acpi_namespace_node *parameter_node = NULL;
134 union acpi_operand_object *ddb_handle;
135 struct acpi_table_header *table;
136 u32 table_index;
137
138 ACPI_FUNCTION_TRACE(ex_load_table_op);
139
140 /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
141
142 if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
143 (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
144 (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
145 return_ACPI_STATUS(AE_BAD_PARAMETER);
146 }
147
148 /* Find the ACPI table in the RSDT/XSDT */
149
150 status = acpi_tb_find_table(operand[0]->string.pointer,
151 operand[1]->string.pointer,
152 operand[2]->string.pointer, &table_index);
153 if (ACPI_FAILURE(status)) {
154 if (status != AE_NOT_FOUND) {
155 return_ACPI_STATUS(status);
156 }
157
158 /* Table not found, return an Integer=0 and AE_OK */
159
160 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
161 if (!ddb_handle) {
162 return_ACPI_STATUS(AE_NO_MEMORY);
163 }
164
165 ddb_handle->integer.value = 0;
166 *return_desc = ddb_handle;
167
168 return_ACPI_STATUS(AE_OK);
169 }
170
171 /* Default nodes */
172
173 start_node = walk_state->scope_info->scope.node;
174 parent_node = acpi_gbl_root_node;
175
176 /* root_path (optional parameter) */
177
178 if (operand[3]->string.length > 0) {
179 /*
180 * Find the node referenced by the root_path_string. This is the
181 * location within the namespace where the table will be loaded.
182 */
183 status =
184 acpi_ns_get_node(start_node, operand[3]->string.pointer,
185 ACPI_NS_SEARCH_PARENT, &parent_node);
186 if (ACPI_FAILURE(status)) {
187 return_ACPI_STATUS(status);
188 }
189 }
190
191 /* parameter_path (optional parameter) */
192
193 if (operand[4]->string.length > 0) {
194 if ((operand[4]->string.pointer[0] != '\\') &&
195 (operand[4]->string.pointer[0] != '^')) {
196 /*
197 * Path is not absolute, so it will be relative to the node
198 * referenced by the root_path_string (or the NS root if omitted)
199 */
200 start_node = parent_node;
201 }
202
203 /* Find the node referenced by the parameter_path_string */
204
205 status =
206 acpi_ns_get_node(start_node, operand[4]->string.pointer,
207 ACPI_NS_SEARCH_PARENT, &parameter_node);
208 if (ACPI_FAILURE(status)) {
209 return_ACPI_STATUS(status);
210 }
211 }
212
213 /* Load the table into the namespace */
214
215 status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
216 if (ACPI_FAILURE(status)) {
217 return_ACPI_STATUS(status);
218 }
219
220 /* Parameter Data (optional) */
221
222 if (parameter_node) {
223
224 /* Store the parameter data into the optional parameter object */
225
226 status = acpi_ex_store(operand[5],
227 ACPI_CAST_PTR(union acpi_operand_object,
228 parameter_node),
229 walk_state);
230 if (ACPI_FAILURE(status)) {
231 (void)acpi_ex_unload_table(ddb_handle);
232 return_ACPI_STATUS(status);
233 }
234 }
235
236 status = acpi_get_table_by_index(table_index, &table);
237 if (ACPI_SUCCESS(status)) {
238 ACPI_INFO((AE_INFO,
239 "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]",
240 table->signature, table->oem_id,
241 table->oem_table_id));
242 }
243
244 /* Invoke table handler if present */
245
246 if (acpi_gbl_table_handler) {
247 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
248 acpi_gbl_table_handler_context);
249 }
250
251 *return_desc = ddb_handle;
252 return_ACPI_STATUS(status);
253}
254
255/*******************************************************************************
256 *
257 * FUNCTION: acpi_ex_load_op
258 *
259 * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
260 * obtained
261 * Target - Where a handle to the table will be stored
262 * walk_state - Current state
263 *
264 * RETURN: Status
265 *
266 * DESCRIPTION: Load an ACPI table from a field or operation region
267 *
268 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
269 * objects before this code is reached.
270 *
271 * If source is an operation region, it must refer to system_memory, as
272 * per the ACPI specification.
273 *
274 ******************************************************************************/
275
276acpi_status
277acpi_ex_load_op(union acpi_operand_object *obj_desc,
278 union acpi_operand_object *target,
279 struct acpi_walk_state *walk_state)
280{
281 union acpi_operand_object *ddb_handle;
282 struct acpi_table_header *table;
283 struct acpi_table_desc table_desc;
284 u32 table_index;
285 acpi_status status;
286 u32 length;
287
288 ACPI_FUNCTION_TRACE(ex_load_op);
289
290 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
291
292 /* Source Object can be either an op_region or a Buffer/Field */
293
294 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
295 case ACPI_TYPE_REGION:
296
297 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
298 "Load table from Region %p\n", obj_desc));
299
300 /* Region must be system_memory (from ACPI spec) */
301
302 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
303 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
304 }
305
306 /*
307 * If the Region Address and Length have not been previously evaluated,
308 * evaluate them now and save the results.
309 */
310 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
311 status = acpi_ds_get_region_arguments(obj_desc);
312 if (ACPI_FAILURE(status)) {
313 return_ACPI_STATUS(status);
314 }
315 }
316
317 /*
318 * Map the table header and get the actual table length. The region
319 * length is not guaranteed to be the same as the table length.
320 */
321 table = acpi_os_map_memory(obj_desc->region.address,
322 sizeof(struct acpi_table_header));
323 if (!table) {
324 return_ACPI_STATUS(AE_NO_MEMORY);
325 }
326
327 length = table->length;
328 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
329
330 /* Must have at least an ACPI table header */
331
332 if (length < sizeof(struct acpi_table_header)) {
333 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
334 }
335
336 /*
337 * The memory region is not guaranteed to remain stable and we must
338 * copy the table to a local buffer. For example, the memory region
339 * is corrupted after suspend on some machines. Dynamically loaded
340 * tables are usually small, so this overhead is minimal.
341 */
342
343 /* Allocate a buffer for the table */
344
345 table_desc.pointer = ACPI_ALLOCATE(length);
346 if (!table_desc.pointer) {
347 return_ACPI_STATUS(AE_NO_MEMORY);
348 }
349
350 /* Map the entire table and copy it */
351
352 table = acpi_os_map_memory(obj_desc->region.address, length);
353 if (!table) {
354 ACPI_FREE(table_desc.pointer);
355 return_ACPI_STATUS(AE_NO_MEMORY);
356 }
357
358 ACPI_MEMCPY(table_desc.pointer, table, length);
359 acpi_os_unmap_memory(table, length);
360
361 table_desc.address = obj_desc->region.address;
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 =
379 ACPI_CAST_PTR(struct acpi_table_header,
380 obj_desc->buffer.pointer);
381 length = table->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 modified
394 * or even deleted in the future
395 */
396 table_desc.pointer = ACPI_ALLOCATE(length);
397 if (!table_desc.pointer) {
398 return_ACPI_STATUS(AE_NO_MEMORY);
399 }
400
401 ACPI_MEMCPY(table_desc.pointer, table, length);
402 table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
403 break;
404
405 default:
406 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
407 }
408
409 /* Validate table checksum (will not get validated in tb_add_table) */
410
411 status = acpi_tb_verify_checksum(table_desc.pointer, length);
412 if (ACPI_FAILURE(status)) {
413 ACPI_FREE(table_desc.pointer);
414 return_ACPI_STATUS(status);
415 }
416
417 /* Complete the table descriptor */
418
419 table_desc.length = length;
420 table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
421
422 /* Install the new table into the local data structures */
423
424 status = acpi_tb_add_table(&table_desc, &table_index);
425 if (ACPI_FAILURE(status)) {
426 goto cleanup;
427 }
428
429 /*
430 * Add the table to the namespace.
431 *
432 * Note: Load the table objects relative to the root of the namespace.
433 * This appears to go against the ACPI specification, but we do it for
434 * compatibility with other ACPI implementations.
435 */
436 status =
437 acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
438 if (ACPI_FAILURE(status)) {
439
440 /* On error, table_ptr was deallocated above */
441
442 return_ACPI_STATUS(status);
443 }
444
445 /* Store the ddb_handle into the Target operand */
446
447 status = acpi_ex_store(ddb_handle, target, walk_state);
448 if (ACPI_FAILURE(status)) {
449 (void)acpi_ex_unload_table(ddb_handle);
450
451 /* table_ptr was deallocated above */
452
453 acpi_ut_remove_reference(ddb_handle);
454 return_ACPI_STATUS(status);
455 }
456
457 /* Invoke table handler if present */
458
459 if (acpi_gbl_table_handler) {
460 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
461 table_desc.pointer,
462 acpi_gbl_table_handler_context);
463 }
464
465 cleanup:
466 if (ACPI_FAILURE(status)) {
467
468 /* Delete allocated table buffer */
469
470 acpi_tb_delete_table(&table_desc);
471 }
472 return_ACPI_STATUS(status);
473}
474
475/*******************************************************************************
476 *
477 * FUNCTION: acpi_ex_unload_table
478 *
479 * PARAMETERS: ddb_handle - Handle to a previously loaded table
480 *
481 * RETURN: Status
482 *
483 * DESCRIPTION: Unload an ACPI table
484 *
485 ******************************************************************************/
486
487acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
488{
489 acpi_status status = AE_OK;
490 union acpi_operand_object *table_desc = ddb_handle;
491 u32 table_index;
492 struct acpi_table_header *table;
493
494 ACPI_FUNCTION_TRACE(ex_unload_table);
495
496 /*
497 * Validate the handle
498 * Although the handle is partially validated in acpi_ex_reconfiguration(),
499 * when it calls acpi_ex_resolve_operands(), the handle is more completely
500 * validated here.
501 */
502 if ((!ddb_handle) ||
503 (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
504 (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
505 return_ACPI_STATUS(AE_BAD_PARAMETER);
506 }
507
508 /* Get the table index from the ddb_handle */
509
510 table_index = table_desc->reference.value;
511
512 /* Invoke table handler if present */
513
514 if (acpi_gbl_table_handler) {
515 status = acpi_get_table_by_index(table_index, &table);
516 if (ACPI_SUCCESS(status)) {
517 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
518 table,
519 acpi_gbl_table_handler_context);
520 }
521 }
522
523 /*
524 * Delete the entire namespace under this table Node
525 * (Offset contains the table_id)
526 */
527 acpi_tb_delete_namespace_by_owner(table_index);
528 (void)acpi_tb_release_owner_id(table_index);
529
530 acpi_tb_set_table_loaded_flag(table_index, FALSE);
531
532 /* Table unloaded, remove a reference to the ddb_handle object */
533
534 acpi_ut_remove_reference(ddb_handle);
535 return_ACPI_STATUS(AE_OK);
536}