--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, Intel Corp.
+ * 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 "accommon.h"
+#include "acinterp.h"
+#include "acnamesp.h"
+#include "actables.h"
+#include "acdispat.h"
+#include "acevents.h"
+#include "amlcode.h"
+
+#define _COMPONENT ACPI_EXECUTER
+ACPI_MODULE_NAME("exconfig")
+
+/* Local prototypes */
+static acpi_status
+acpi_ex_add_table(u32 table_index,
+ struct acpi_namespace_node *parent_node,
+ union acpi_operand_object **ddb_handle);
+
+static acpi_status
+acpi_ex_region_read(union acpi_operand_object *obj_desc,
+ u32 length, u8 *buffer);
+
+/*******************************************************************************
+ *
+ * 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.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_add_table(u32 table_index,
+ struct acpi_namespace_node *parent_node,
+ union acpi_operand_object **ddb_handle)
+{
+ union acpi_operand_object *obj_desc;
+ acpi_status status;
+ acpi_owner_id owner_id;
+
+ 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);
+ }
+
+ /* Init the table handle */
+
+ obj_desc->common.flags |= AOPOBJ_DATA_VALID;
+ obj_desc->reference.class = ACPI_REFCLASS_TABLE;
+ *ddb_handle = obj_desc;
+
+ /* Install the new table into the local data structures */
+
+ obj_desc->reference.value = table_index;
+
+ /* Add the table to the namespace */
+
+ status = acpi_ns_load_table(table_index, parent_node);
+ if (ACPI_FAILURE(status)) {
+ acpi_ut_remove_reference(obj_desc);
+ *ddb_handle = NULL;
+ return_ACPI_STATUS(status);
+ }
+
+ /* Execute any module-level code that was found in the table */
+
+ acpi_ex_exit_interpreter();
+ acpi_ns_exec_module_code_list();
+ acpi_ex_enter_interpreter();
+
+ /*
+ * Update GPEs for any new _Lxx/_Exx methods. Ignore errors. The host is
+ * responsible for discovering any new wake GPEs by running _PRW methods
+ * that may have been loaded by this table.
+ */
+ status = acpi_tb_get_owner_id(table_index, &owner_id);
+ if (ACPI_SUCCESS(status)) {
+ acpi_ev_update_gpes(owner_id);
+ }
+
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * 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 from the RSDT/XSDT
+ *
+ ******************************************************************************/
+
+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_namespace_node *parent_node;
+ struct acpi_namespace_node *start_node;
+ struct acpi_namespace_node *parameter_node = NULL;
+ union acpi_operand_object *ddb_handle;
+ struct acpi_table_header *table;
+ u32 table_index;
+
+ ACPI_FUNCTION_TRACE(ex_load_table_op);
+
+ /* Validate lengths for the Signature, oem_id, and oem_table_id strings */
+
+ if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
+ (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
+ (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
+ return_ACPI_STATUS(AE_AML_STRING_LIMIT);
+ }
+
+ /* Find the ACPI table in the RSDT/XSDT */
+
+ status = acpi_tb_find_table(operand[0]->string.pointer,
+ operand[1]->string.pointer,
+ operand[2]->string.pointer, &table_index);
+ 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_integer_object((u64) 0);
+ if (!ddb_handle) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ *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(start_node, operand[3]->string.pointer,
+ 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] != AML_ROOT_PREFIX) &&
+ (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
+ /*
+ * 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(start_node, operand[4]->string.pointer,
+ ACPI_NS_SEARCH_PARENT, ¶meter_node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ /* Load the table into the namespace */
+
+ status = acpi_ex_add_table(table_index, 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);
+
+ acpi_ut_remove_reference(ddb_handle);
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ status = acpi_get_table_by_index(table_index, &table);
+ if (ACPI_SUCCESS(status)) {
+ ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
+ acpi_tb_print_table_header(0, table);
+ }
+
+ /* Invoke table handler if present */
+
+ if (acpi_gbl_table_handler) {
+ (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
+ acpi_gbl_table_handler_context);
+ }
+
+ *return_desc = ddb_handle;
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_region_read
+ *
+ * PARAMETERS: obj_desc - Region descriptor
+ * length - Number of bytes to read
+ * buffer - Pointer to where to put the data
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Read data from an operation region. The read starts from the
+ * beginning of the region.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
+{
+ acpi_status status;
+ u64 value;
+ u32 region_offset = 0;
+ u32 i;
+
+ /* Bytewise reads */
+
+ for (i = 0; i < length; i++) {
+ status =
+ acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
+ region_offset, 8, &value);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ *buffer = (u8)value;
+ buffer++;
+ region_offset++;
+ }
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_load_op
+ *
+ * PARAMETERS: obj_desc - Region or Buffer/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
+ *
+ * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
+ * objects before this code is reached.
+ *
+ * If source is an operation region, it must refer to system_memory, as
+ * per the ACPI specification.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_load_op(union acpi_operand_object *obj_desc,
+ union acpi_operand_object *target,
+ struct acpi_walk_state *walk_state)
+{
+ union acpi_operand_object *ddb_handle;
+ struct acpi_table_header *table_header;
+ struct acpi_table_header *table;
+ u32 table_index;
+ acpi_status status;
+ u32 length;
+
+ ACPI_FUNCTION_TRACE(ex_load_op);
+
+ /* Source Object can be either an op_region or a Buffer/Field */
+
+ switch (obj_desc->common.type) {
+ case ACPI_TYPE_REGION:
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Load table from Region %p\n", obj_desc));
+
+ /* Region must be system_memory (from ACPI spec) */
+
+ if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /*
+ * 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 table header first so we can get the table length */
+
+ table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
+ if (!table_header) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ status =
+ acpi_ex_region_read(obj_desc,
+ sizeof(struct acpi_table_header),
+ ACPI_CAST_PTR(u8, table_header));
+ length = table_header->length;
+ ACPI_FREE(table_header);
+
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Must have at least an ACPI table header */
+
+ if (length < sizeof(struct acpi_table_header)) {
+ return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+ }
+
+ /*
+ * The original implementation simply mapped the table, with no copy.
+ * However, the memory region is not guaranteed to remain stable and
+ * we must copy the table to a local buffer. For example, the memory
+ * region is corrupted after suspend on some machines. Dynamically
+ * loaded tables are usually small, so this overhead is minimal.
+ *
+ * The latest implementation (5/2009) does not use a mapping at all.
+ * We use the low-level operation region interface to read the table
+ * instead of the obvious optimization of using a direct mapping.
+ * This maintains a consistent use of operation regions across the
+ * entire subsystem. This is important if additional processing must
+ * be performed in the (possibly user-installed) operation region
+ * handler. For example, acpi_exec and ASLTS depend on this.
+ */
+
+ /* Allocate a buffer for the table */
+
+ table = ACPI_ALLOCATE(length);
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Read the entire table */
+
+ status = acpi_ex_region_read(obj_desc, length,
+ ACPI_CAST_PTR(u8, table));
+ if (ACPI_FAILURE(status)) {
+ ACPI_FREE(table);
+ return_ACPI_STATUS(status);
+ }
+ break;
+
+ case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Load table from Buffer or Field %p\n",
+ obj_desc));
+
+ /* Must have at least an ACPI table header */
+
+ if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
+ return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+ }
+
+ /* Get the actual table length from the table header */
+
+ table_header =
+ ACPI_CAST_PTR(struct acpi_table_header,
+ obj_desc->buffer.pointer);
+ length = table_header->length;
+
+ /* Table cannot extend beyond the buffer */
+
+ if (length > obj_desc->buffer.length) {
+ return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
+ }
+ if (length < sizeof(struct acpi_table_header)) {
+ return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+ }
+
+ /*
+ * Copy the table from the buffer because the buffer could be modified
+ * or even deleted in the future
+ */
+ table = ACPI_ALLOCATE(length);
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ ACPI_MEMCPY(table, table_header, length);
+ break;
+
+ default:
+
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /* Install the new table into the local data structures */
+
+ ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
+ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+ status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
+ ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
+ TRUE, TRUE, &table_index);
+
+ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+ if (ACPI_FAILURE(status)) {
+
+ /* Delete allocated table buffer */
+
+ ACPI_FREE(table);
+ return_ACPI_STATUS(status);
+ }
+
+ /*
+ * Note: Now table is "INSTALLED", it must be validated before
+ * loading.
+ */
+ status =
+ acpi_tb_validate_table(&acpi_gbl_root_table_list.
+ tables[table_index]);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /*
+ * Add the table to the namespace.
+ *
+ * Note: Load the table objects relative to the root of the namespace.
+ * This appears to go against the ACPI specification, but we do it for
+ * compatibility with other ACPI implementations.
+ */
+ status =
+ acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
+ if (ACPI_FAILURE(status)) {
+
+ /* On error, table_ptr was deallocated above */
+
+ return_ACPI_STATUS(status);
+ }
+
+ /* 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);
+
+ /* table_ptr was deallocated above */
+
+ acpi_ut_remove_reference(ddb_handle);
+ return_ACPI_STATUS(status);
+ }
+
+ /* Remove the reference by added by acpi_ex_store above */
+
+ acpi_ut_remove_reference(ddb_handle);
+
+ /* Invoke table handler if present */
+
+ if (acpi_gbl_table_handler) {
+ (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
+ acpi_gbl_table_handler_context);
+ }
+
+ 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;
+ u32 table_index;
+ struct acpi_table_header *table;
+
+ ACPI_FUNCTION_TRACE(ex_unload_table);
+
+ /*
+ * Temporarily emit a warning so that the ASL for the machine can be
+ * hopefully obtained. This is to say that the Unload() operator is
+ * extremely rare if not completely unused.
+ */
+ ACPI_WARNING((AE_INFO, "Received request to unload an ACPI 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.
+ *
+ * Handle must be a valid operand object of type reference. Also, the
+ * ddb_handle must still be marked valid (table has not been previously
+ * unloaded)
+ */
+ if ((!ddb_handle) ||
+ (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
+ (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
+ (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /* Get the table index from the ddb_handle */
+
+ table_index = table_desc->reference.value;
+
+ /* Ensure the table is still loaded */
+
+ if (!acpi_tb_is_table_loaded(table_index)) {
+ return_ACPI_STATUS(AE_NOT_EXIST);
+ }
+
+ /* Invoke table handler if present */
+
+ if (acpi_gbl_table_handler) {
+ status = acpi_get_table_by_index(table_index, &table);
+ if (ACPI_SUCCESS(status)) {
+ (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
+ table,
+ acpi_gbl_table_handler_context);
+ }
+ }
+
+ /* Delete the portion of the namespace owned by this table */
+
+ status = acpi_tb_delete_namespace_by_owner(table_index);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ (void)acpi_tb_release_owner_id(table_index);
+ acpi_tb_set_table_loaded_flag(table_index, FALSE);
+
+ /*
+ * Invalidate the handle. We do this because the handle may be stored
+ * in a named object and may not be actually deleted until much later.
+ */
+ ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
+ return_ACPI_STATUS(AE_OK);
+}
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