/****************************************************************************** * * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) * *****************************************************************************/ /* * Copyright (C) 2000 - 2016, 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 #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, 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, union acpi_operand_object **ddb_handle) { 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); } /* Init the table handle */ obj_desc->common.flags |= AOPOBJ_DATA_VALID; obj_desc->reference.class = ACPI_REFCLASS_TABLE; obj_desc->reference.value = table_index; *ddb_handle = obj_desc; 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; u32 table_index; ACPI_FUNCTION_TRACE(ex_load_table_op); /* Find the ACPI table in the RSDT/XSDT */ acpi_ex_exit_interpreter(); status = acpi_tb_find_table(operand[0]->string.pointer, operand[1]->string.pointer, operand[2]->string.pointer, &table_index); acpi_ex_enter_interpreter(); 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_unlocked(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_unlocked(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 */ ACPI_INFO(("Dynamic OEM Table Load:")); acpi_ex_exit_interpreter(); status = acpi_tb_load_table(table_index, parent_node); acpi_ex_enter_interpreter(); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } status = acpi_ex_add_table(table_index, &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); } } *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); } 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(("Dynamic OEM Table Load:")); acpi_ex_exit_interpreter(); status = acpi_tb_install_and_load_table(table, ACPI_PTR_TO_PHYSADDR(table), ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, TRUE, &table_index); acpi_ex_enter_interpreter(); if (ACPI_FAILURE(status)) { /* Delete allocated table buffer */ ACPI_FREE(table); 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, &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); 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); }