| /****************************************************************************** |
| * |
| * 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 <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, 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(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; |
| |
| 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; |
| |
| /* |
| * Release the interpreter lock so that the table lock won't have |
| * strict order requirement against it. |
| */ |
| acpi_ex_exit_interpreter(); |
| status = acpi_tb_unload_table(table_index); |
| acpi_ex_enter_interpreter(); |
| |
| /* |
| * 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. |
| */ |
| if (ACPI_SUCCESS(status)) { |
| ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID; |
| } |
| return_ACPI_STATUS(status); |
| } |