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path: root/drivers/acpi/executer/exconfig.c
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-rw-r--r--drivers/acpi/executer/exconfig.c487
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diff --git a/drivers/acpi/executer/exconfig.c b/drivers/acpi/executer/exconfig.c
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+/******************************************************************************
+ *
+ * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+
+#include <acpi/acpi.h>
+#include <acpi/acinterp.h>
+#include <acpi/amlcode.h>
+#include <acpi/acnamesp.h>
+#include <acpi/acevents.h>
+#include <acpi/actables.h>
+#include <acpi/acdispat.h>
+
+
+#define _COMPONENT ACPI_EXECUTER
+ ACPI_MODULE_NAME ("exconfig")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_add_table
+ *
+ * PARAMETERS: Table - Pointer to raw table
+ * parent_node - Where to load the table (scope)
+ * ddb_handle - Where to return the table handle.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Common function to Install and Load an ACPI table with a
+ * returned table handle.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_add_table (
+ struct acpi_table_header *table,
+ struct acpi_namespace_node *parent_node,
+ union acpi_operand_object **ddb_handle)
+{
+ acpi_status status;
+ struct acpi_table_desc table_info;
+ union acpi_operand_object *obj_desc;
+
+
+ ACPI_FUNCTION_TRACE ("ex_add_table");
+
+
+ /* Create an object to be the table handle */
+
+ obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_REFERENCE);
+ if (!obj_desc) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ /* Install the new table into the local data structures */
+
+ ACPI_MEMSET (&table_info, 0, sizeof (struct acpi_table_desc));
+
+ table_info.type = ACPI_TABLE_SSDT;
+ table_info.pointer = table;
+ table_info.length = (acpi_size) table->length;
+ table_info.allocation = ACPI_MEM_ALLOCATED;
+
+ status = acpi_tb_install_table (&table_info);
+ if (ACPI_FAILURE (status)) {
+ goto cleanup;
+ }
+
+ /* Add the table to the namespace */
+
+ status = acpi_ns_load_table (table_info.installed_desc, parent_node);
+ if (ACPI_FAILURE (status)) {
+ /* Uninstall table on error */
+
+ (void) acpi_tb_uninstall_table (table_info.installed_desc);
+ goto cleanup;
+ }
+
+ /* Init the table handle */
+
+ obj_desc->reference.opcode = AML_LOAD_OP;
+ obj_desc->reference.object = table_info.installed_desc;
+ *ddb_handle = obj_desc;
+ return_ACPI_STATUS (AE_OK);
+
+
+cleanup:
+ acpi_ut_remove_reference (obj_desc);
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_load_table_op
+ *
+ * PARAMETERS: walk_state - Current state with operands
+ * return_desc - Where to store the return object
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Load an ACPI table
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_load_table_op (
+ struct acpi_walk_state *walk_state,
+ union acpi_operand_object **return_desc)
+{
+ acpi_status status;
+ union acpi_operand_object **operand = &walk_state->operands[0];
+ struct acpi_table_header *table;
+ struct acpi_namespace_node *parent_node;
+ struct acpi_namespace_node *start_node;
+ struct acpi_namespace_node *parameter_node = NULL;
+ union acpi_operand_object *ddb_handle;
+
+
+ ACPI_FUNCTION_TRACE ("ex_load_table_op");
+
+
+#if 0
+ /*
+ * Make sure that the signature does not match one of the tables that
+ * is already loaded.
+ */
+ status = acpi_tb_match_signature (operand[0]->string.pointer, NULL);
+ if (status == AE_OK) {
+ /* Signature matched -- don't allow override */
+
+ return_ACPI_STATUS (AE_ALREADY_EXISTS);
+ }
+#endif
+
+ /* Find the ACPI table */
+
+ status = acpi_tb_find_table (operand[0]->string.pointer,
+ operand[1]->string.pointer,
+ operand[2]->string.pointer, &table);
+ if (ACPI_FAILURE (status)) {
+ if (status != AE_NOT_FOUND) {
+ return_ACPI_STATUS (status);
+ }
+
+ /* Table not found, return an Integer=0 and AE_OK */
+
+ ddb_handle = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
+ if (!ddb_handle) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ ddb_handle->integer.value = 0;
+ *return_desc = ddb_handle;
+
+ return_ACPI_STATUS (AE_OK);
+ }
+
+ /* Default nodes */
+
+ start_node = walk_state->scope_info->scope.node;
+ parent_node = acpi_gbl_root_node;
+
+ /* root_path (optional parameter) */
+
+ if (operand[3]->string.length > 0) {
+ /*
+ * Find the node referenced by the root_path_string. This is the
+ * location within the namespace where the table will be loaded.
+ */
+ status = acpi_ns_get_node_by_path (operand[3]->string.pointer, start_node,
+ ACPI_NS_SEARCH_PARENT, &parent_node);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ /* parameter_path (optional parameter) */
+
+ if (operand[4]->string.length > 0) {
+ if ((operand[4]->string.pointer[0] != '\\') &&
+ (operand[4]->string.pointer[0] != '^')) {
+ /*
+ * Path is not absolute, so it will be relative to the node
+ * referenced by the root_path_string (or the NS root if omitted)
+ */
+ start_node = parent_node;
+ }
+
+ /*
+ * Find the node referenced by the parameter_path_string
+ */
+ status = acpi_ns_get_node_by_path (operand[4]->string.pointer, start_node,
+ ACPI_NS_SEARCH_PARENT, &parameter_node);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ /* Load the table into the namespace */
+
+ status = acpi_ex_add_table (table, parent_node, &ddb_handle);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ /* Parameter Data (optional) */
+
+ if (parameter_node) {
+ /* Store the parameter data into the optional parameter object */
+
+ status = acpi_ex_store (operand[5], ACPI_CAST_PTR (union acpi_operand_object, parameter_node),
+ walk_state);
+ if (ACPI_FAILURE (status)) {
+ (void) acpi_ex_unload_table (ddb_handle);
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ *return_desc = ddb_handle;
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_load_op
+ *
+ * PARAMETERS: obj_desc - Region or Field where the table will be
+ * obtained
+ * Target - Where a handle to the table will be stored
+ * walk_state - Current state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Load an ACPI table from a field or operation region
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_load_op (
+ union acpi_operand_object *obj_desc,
+ union acpi_operand_object *target,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status;
+ union acpi_operand_object *ddb_handle;
+ union acpi_operand_object *buffer_desc = NULL;
+ struct acpi_table_header *table_ptr = NULL;
+ acpi_physical_address address;
+ struct acpi_table_header table_header;
+ u32 i;
+
+ ACPI_FUNCTION_TRACE ("ex_load_op");
+
+
+ /* Object can be either an op_region or a Field */
+
+ switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
+ case ACPI_TYPE_REGION:
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Region %p %s\n",
+ obj_desc, acpi_ut_get_object_type_name (obj_desc)));
+
+ /*
+ * If the Region Address and Length have not been previously evaluated,
+ * evaluate them now and save the results.
+ */
+ if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
+ status = acpi_ds_get_region_arguments (obj_desc);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ /* Get the base physical address of the region */
+
+ address = obj_desc->region.address;
+
+ /* Get the table length from the table header */
+
+ table_header.length = 0;
+ for (i = 0; i < 8; i++) {
+ status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
+ (acpi_physical_address) (i + address), 8,
+ ((u8 *) &table_header) + i);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ /* Sanity check the table length */
+
+ if (table_header.length < sizeof (struct acpi_table_header)) {
+ return_ACPI_STATUS (AE_BAD_HEADER);
+ }
+
+ /* Allocate a buffer for the entire table */
+
+ table_ptr = ACPI_MEM_ALLOCATE (table_header.length);
+ if (!table_ptr) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ /* Get the entire table from the op region */
+
+ for (i = 0; i < table_header.length; i++) {
+ status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
+ (acpi_physical_address) (i + address), 8,
+ ((u8 *) table_ptr + i));
+ if (ACPI_FAILURE (status)) {
+ goto cleanup;
+ }
+ }
+ break;
+
+
+ case ACPI_TYPE_LOCAL_REGION_FIELD:
+ case ACPI_TYPE_LOCAL_BANK_FIELD:
+ case ACPI_TYPE_LOCAL_INDEX_FIELD:
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Field %p %s\n",
+ obj_desc, acpi_ut_get_object_type_name (obj_desc)));
+
+ /*
+ * The length of the field must be at least as large as the table.
+ * Read the entire field and thus the entire table. Buffer is
+ * allocated during the read.
+ */
+ status = acpi_ex_read_data_from_field (walk_state, obj_desc, &buffer_desc);
+ if (ACPI_FAILURE (status)) {
+ goto cleanup;
+ }
+
+ table_ptr = ACPI_CAST_PTR (struct acpi_table_header, buffer_desc->buffer.pointer);
+
+ /* Sanity check the table length */
+
+ if (table_ptr->length < sizeof (struct acpi_table_header)) {
+ return_ACPI_STATUS (AE_BAD_HEADER);
+ }
+ break;
+
+
+ default:
+ return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
+ }
+
+ /* The table must be either an SSDT or a PSDT */
+
+ if ((!ACPI_STRNCMP (table_ptr->signature,
+ acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
+ acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
+ (!ACPI_STRNCMP (table_ptr->signature,
+ acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
+ acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Table has invalid signature [%4.4s], must be SSDT or PSDT\n",
+ table_ptr->signature));
+ status = AE_BAD_SIGNATURE;
+ goto cleanup;
+ }
+
+ /* Install the new table into the local data structures */
+
+ status = acpi_ex_add_table (table_ptr, acpi_gbl_root_node, &ddb_handle);
+ if (ACPI_FAILURE (status)) {
+ goto cleanup;
+ }
+
+ /* Store the ddb_handle into the Target operand */
+
+ status = acpi_ex_store (ddb_handle, target, walk_state);
+ if (ACPI_FAILURE (status)) {
+ (void) acpi_ex_unload_table (ddb_handle);
+ }
+
+ return_ACPI_STATUS (status);
+
+
+cleanup:
+
+ if (buffer_desc) {
+ acpi_ut_remove_reference (buffer_desc);
+ }
+ else {
+ ACPI_MEM_FREE (table_ptr);
+ }
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_unload_table
+ *
+ * PARAMETERS: ddb_handle - Handle to a previously loaded table
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Unload an ACPI table
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_unload_table (
+ union acpi_operand_object *ddb_handle)
+{
+ acpi_status status = AE_OK;
+ union acpi_operand_object *table_desc = ddb_handle;
+ struct acpi_table_desc *table_info;
+
+
+ ACPI_FUNCTION_TRACE ("ex_unload_table");
+
+
+ /*
+ * Validate the handle
+ * Although the handle is partially validated in acpi_ex_reconfiguration(),
+ * when it calls acpi_ex_resolve_operands(), the handle is more completely
+ * validated here.
+ */
+ if ((!ddb_handle) ||
+ (ACPI_GET_DESCRIPTOR_TYPE (ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
+ (ACPI_GET_OBJECT_TYPE (ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
+ return_ACPI_STATUS (AE_BAD_PARAMETER);
+ }
+
+ /* Get the actual table descriptor from the ddb_handle */
+
+ table_info = (struct acpi_table_desc *) table_desc->reference.object;
+
+ /*
+ * Delete the entire namespace under this table Node
+ * (Offset contains the table_id)
+ */
+ acpi_ns_delete_namespace_by_owner (table_info->table_id);
+
+ /* Delete the table itself */
+
+ (void) acpi_tb_uninstall_table (table_info->installed_desc);
+
+ /* Delete the table descriptor (ddb_handle) */
+
+ acpi_ut_remove_reference (table_desc);
+ return_ACPI_STATUS (status);
+}
+