1 /******************************************************************************
3 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2007, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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
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44 #include <acpi/acpi.h>
45 #include <acpi/acinterp.h>
46 #include <acpi/amlcode.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acevents.h>
49 #include <acpi/actables.h>
50 #include <acpi/acdispat.h>
52 #define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME("exconfig")
55 /* Local prototypes */
57 acpi_ex_add_table(acpi_native_uint table_index,
58 struct acpi_namespace_node *parent_node,
59 union acpi_operand_object **ddb_handle);
61 /*******************************************************************************
63 * FUNCTION: acpi_ex_add_table
65 * PARAMETERS: Table - Pointer to raw table
66 * parent_node - Where to load the table (scope)
67 * ddb_handle - Where to return the table handle.
71 * DESCRIPTION: Common function to Install and Load an ACPI table with a
72 * returned table handle.
74 ******************************************************************************/
77 acpi_ex_add_table(acpi_native_uint table_index,
78 struct acpi_namespace_node *parent_node,
79 union acpi_operand_object **ddb_handle)
82 union acpi_operand_object *obj_desc;
84 ACPI_FUNCTION_TRACE(ex_add_table);
86 /* Create an object to be the table handle */
88 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
90 return_ACPI_STATUS(AE_NO_MEMORY);
93 /* Init the table handle */
95 obj_desc->reference.opcode = AML_LOAD_OP;
96 *ddb_handle = obj_desc;
98 /* Install the new table into the local data structures */
100 obj_desc->reference.object = ACPI_CAST_PTR(void, table_index);
102 /* Add the table to the namespace */
104 status = acpi_ns_load_table(table_index, parent_node);
105 if (ACPI_FAILURE(status)) {
106 acpi_ut_remove_reference(obj_desc);
110 return_ACPI_STATUS(status);
113 /*******************************************************************************
115 * FUNCTION: acpi_ex_load_table_op
117 * PARAMETERS: walk_state - Current state with operands
118 * return_desc - Where to store the return object
122 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
124 ******************************************************************************/
127 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
128 union acpi_operand_object **return_desc)
131 union acpi_operand_object **operand = &walk_state->operands[0];
132 acpi_native_uint table_index;
133 struct acpi_namespace_node *parent_node;
134 struct acpi_namespace_node *start_node;
135 struct acpi_namespace_node *parameter_node = NULL;
136 union acpi_operand_object *ddb_handle;
137 struct acpi_table_header *table;
139 ACPI_FUNCTION_TRACE(ex_load_table_op);
141 /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
143 if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
144 (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
145 (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
146 return_ACPI_STATUS(AE_BAD_PARAMETER);
149 /* Find the ACPI table in the RSDT/XSDT */
151 status = acpi_tb_find_table(operand[0]->string.pointer,
152 operand[1]->string.pointer,
153 operand[2]->string.pointer, &table_index);
154 if (ACPI_FAILURE(status)) {
155 if (status != AE_NOT_FOUND) {
156 return_ACPI_STATUS(status);
159 /* Table not found, return an Integer=0 and AE_OK */
161 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
163 return_ACPI_STATUS(AE_NO_MEMORY);
166 ddb_handle->integer.value = 0;
167 *return_desc = ddb_handle;
169 return_ACPI_STATUS(AE_OK);
174 start_node = walk_state->scope_info->scope.node;
175 parent_node = acpi_gbl_root_node;
177 /* root_path (optional parameter) */
179 if (operand[3]->string.length > 0) {
181 * Find the node referenced by the root_path_string. This is the
182 * location within the namespace where the table will be loaded.
185 acpi_ns_get_node(start_node, operand[3]->string.pointer,
186 ACPI_NS_SEARCH_PARENT, &parent_node);
187 if (ACPI_FAILURE(status)) {
188 return_ACPI_STATUS(status);
192 /* parameter_path (optional parameter) */
194 if (operand[4]->string.length > 0) {
195 if ((operand[4]->string.pointer[0] != '\\') &&
196 (operand[4]->string.pointer[0] != '^')) {
198 * Path is not absolute, so it will be relative to the node
199 * referenced by the root_path_string (or the NS root if omitted)
201 start_node = parent_node;
204 /* Find the node referenced by the parameter_path_string */
207 acpi_ns_get_node(start_node, operand[4]->string.pointer,
208 ACPI_NS_SEARCH_PARENT, ¶meter_node);
209 if (ACPI_FAILURE(status)) {
210 return_ACPI_STATUS(status);
214 /* Load the table into the namespace */
216 status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
217 if (ACPI_FAILURE(status)) {
218 return_ACPI_STATUS(status);
221 /* Parameter Data (optional) */
223 if (parameter_node) {
225 /* Store the parameter data into the optional parameter object */
227 status = acpi_ex_store(operand[5],
228 ACPI_CAST_PTR(union acpi_operand_object,
231 if (ACPI_FAILURE(status)) {
232 (void)acpi_ex_unload_table(ddb_handle);
233 return_ACPI_STATUS(status);
237 status = acpi_get_table_by_index(table_index, &table);
238 if (ACPI_SUCCESS(status)) {
240 "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
241 table->signature, table->oem_id,
242 table->oem_table_id));
245 /* Invoke table handler if present */
247 if (acpi_gbl_table_handler) {
248 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
249 acpi_gbl_table_handler_context);
252 *return_desc = ddb_handle;
253 return_ACPI_STATUS(status);
256 /*******************************************************************************
258 * FUNCTION: acpi_ex_load_op
260 * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
262 * Target - Where a handle to the table will be stored
263 * walk_state - Current state
267 * DESCRIPTION: Load an ACPI table from a field or operation region
269 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
270 * objects before this code is reached.
272 * If source is an operation region, it must refer to system_memory, as
273 * per the ACPI specification.
275 ******************************************************************************/
278 acpi_ex_load_op(union acpi_operand_object *obj_desc,
279 union acpi_operand_object *target,
280 struct acpi_walk_state *walk_state)
282 union acpi_operand_object *ddb_handle;
283 struct acpi_table_desc table_desc;
284 acpi_native_uint table_index;
288 ACPI_FUNCTION_TRACE(ex_load_op);
290 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
292 /* Source Object can be either an op_region or a Buffer/Field */
294 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
295 case ACPI_TYPE_REGION:
297 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
299 acpi_ut_get_object_type_name(obj_desc)));
301 /* Region must be system_memory (from ACPI spec) */
303 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
304 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
308 * If the Region Address and Length have not been previously evaluated,
309 * evaluate them now and save the results.
311 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
312 status = acpi_ds_get_region_arguments(obj_desc);
313 if (ACPI_FAILURE(status)) {
314 return_ACPI_STATUS(status);
319 * We will simply map the memory region for the table. However, the
320 * memory region is technically not guaranteed to remain stable and
321 * we may eventually have to copy the table to a local buffer.
323 table_desc.address = obj_desc->region.address;
324 table_desc.length = obj_desc->region.length;
325 table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED;
328 case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
330 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
331 "Load from Buffer or Field %p %s\n", obj_desc,
332 acpi_ut_get_object_type_name(obj_desc)));
334 length = obj_desc->buffer.length;
336 /* Must have at least an ACPI table header */
338 if (length < sizeof(struct acpi_table_header)) {
339 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
342 /* Validate checksum here. It won't get validated in tb_add_table */
344 status = acpi_tb_verify_checksum((struct acpi_table_header *)
345 obj_desc->buffer.pointer,
347 if (ACPI_FAILURE(status)) {
348 return_ACPI_STATUS(status);
352 * We need to copy the buffer since the original buffer could be
353 * changed or deleted in the future
355 table_desc.pointer = ACPI_ALLOCATE(length);
356 if (!table_desc.pointer) {
357 return_ACPI_STATUS(AE_NO_MEMORY);
360 ACPI_MEMCPY(table_desc.pointer, obj_desc->buffer.pointer,
362 table_desc.length = length;
363 table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
367 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
371 * Install the new table into the local data structures
373 status = acpi_tb_add_table(&table_desc, &table_index);
374 if (ACPI_FAILURE(status)) {
379 acpi_ex_add_table(table_index, walk_state->scope_info->scope.node,
381 if (ACPI_FAILURE(status)) {
383 /* On error, table_ptr was deallocated above */
385 return_ACPI_STATUS(status);
388 /* Store the ddb_handle into the Target operand */
390 status = acpi_ex_store(ddb_handle, target, walk_state);
391 if (ACPI_FAILURE(status)) {
392 (void)acpi_ex_unload_table(ddb_handle);
394 /* table_ptr was deallocated above */
396 acpi_ut_remove_reference(ddb_handle);
397 return_ACPI_STATUS(status);
400 /* Invoke table handler if present */
402 if (acpi_gbl_table_handler) {
403 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
405 acpi_gbl_table_handler_context);
409 if (ACPI_FAILURE(status)) {
411 /* Delete allocated buffer or mapping */
413 acpi_tb_delete_table(&table_desc);
415 return_ACPI_STATUS(status);
418 /*******************************************************************************
420 * FUNCTION: acpi_ex_unload_table
422 * PARAMETERS: ddb_handle - Handle to a previously loaded table
426 * DESCRIPTION: Unload an ACPI table
428 ******************************************************************************/
430 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
432 acpi_status status = AE_OK;
433 union acpi_operand_object *table_desc = ddb_handle;
434 acpi_native_uint table_index;
435 struct acpi_table_header *table;
437 ACPI_FUNCTION_TRACE(ex_unload_table);
440 * Validate the handle
441 * Although the handle is partially validated in acpi_ex_reconfiguration(),
442 * when it calls acpi_ex_resolve_operands(), the handle is more completely
446 (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
447 (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
448 return_ACPI_STATUS(AE_BAD_PARAMETER);
451 /* Get the table index from the ddb_handle */
453 table_index = (acpi_native_uint) table_desc->reference.object;
455 /* Invoke table handler if present */
457 if (acpi_gbl_table_handler) {
458 status = acpi_get_table_by_index(table_index, &table);
459 if (ACPI_SUCCESS(status)) {
460 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
462 acpi_gbl_table_handler_context);
467 * Delete the entire namespace under this table Node
468 * (Offset contains the table_id)
470 acpi_tb_delete_namespace_by_owner(table_index);
471 acpi_tb_release_owner_id(table_index);
473 acpi_tb_set_table_loaded_flag(table_index, FALSE);
475 /* Delete the table descriptor (ddb_handle) */
477 acpi_ut_remove_reference(table_desc);
478 return_ACPI_STATUS(AE_OK);