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Diffstat (limited to 'drivers/acpi/executer/exstoren.c')
| -rw-r--r-- | drivers/acpi/executer/exstoren.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/acpi/executer/exstoren.c b/drivers/acpi/executer/exstoren.c new file mode 100644 index 000000000000..d3677feb07fd --- /dev/null +++ b/drivers/acpi/executer/exstoren.c @@ -0,0 +1,306 @@ + +/****************************************************************************** + * + * Module Name: exstoren - AML Interpreter object store support, + * Store to Node (namespace object) + * + *****************************************************************************/ + +/* + * 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> + + +#define _COMPONENT ACPI_EXECUTER + ACPI_MODULE_NAME ("exstoren") + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_resolve_object + * + * PARAMETERS: source_desc_ptr - Pointer to the source object + * target_type - Current type of the target + * walk_state - Current walk state + * + * RETURN: Status, resolved object in source_desc_ptr. + * + * DESCRIPTION: Resolve an object. If the object is a reference, dereference + * it and return the actual object in the source_desc_ptr. + * + ******************************************************************************/ + +acpi_status +acpi_ex_resolve_object ( + union acpi_operand_object **source_desc_ptr, + acpi_object_type target_type, + struct acpi_walk_state *walk_state) +{ + union acpi_operand_object *source_desc = *source_desc_ptr; + acpi_status status = AE_OK; + + + ACPI_FUNCTION_TRACE ("ex_resolve_object"); + + + /* + * Ensure we have a Target that can be stored to + */ + switch (target_type) { + case ACPI_TYPE_BUFFER_FIELD: + case ACPI_TYPE_LOCAL_REGION_FIELD: + case ACPI_TYPE_LOCAL_BANK_FIELD: + case ACPI_TYPE_LOCAL_INDEX_FIELD: + /* + * These cases all require only Integers or values that + * can be converted to Integers (Strings or Buffers) + */ + + case ACPI_TYPE_INTEGER: + case ACPI_TYPE_STRING: + case ACPI_TYPE_BUFFER: + + /* + * Stores into a Field/Region or into a Integer/Buffer/String + * are all essentially the same. This case handles the + * "interchangeable" types Integer, String, and Buffer. + */ + if (ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_LOCAL_REFERENCE) { + /* Resolve a reference object first */ + + status = acpi_ex_resolve_to_value (source_desc_ptr, walk_state); + if (ACPI_FAILURE (status)) { + break; + } + } + + /* For copy_object, no further validation necessary */ + + if (walk_state->opcode == AML_COPY_OP) { + break; + } + + /* + * Must have a Integer, Buffer, or String + */ + if ((ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_INTEGER) && + (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_BUFFER) && + (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_STRING) && + !((ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_LOCAL_REFERENCE) && (source_desc->reference.opcode == AML_LOAD_OP))) { + /* + * Conversion successful but still not a valid type + */ + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Cannot assign type %s to %s (must be type Int/Str/Buf)\n", + acpi_ut_get_object_type_name (source_desc), + acpi_ut_get_type_name (target_type))); + status = AE_AML_OPERAND_TYPE; + } + break; + + + case ACPI_TYPE_LOCAL_ALIAS: + case ACPI_TYPE_LOCAL_METHOD_ALIAS: + + /* + * Aliases are resolved by acpi_ex_prep_operands + */ + ACPI_REPORT_ERROR (("Store into Alias - should never happen\n")); + status = AE_AML_INTERNAL; + break; + + + case ACPI_TYPE_PACKAGE: + default: + + /* + * All other types than Alias and the various Fields come here, + * including the untyped case - ACPI_TYPE_ANY. + */ + break; + } + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_store_object_to_object + * + * PARAMETERS: source_desc - Object to store + * dest_desc - Object to receive a copy of the source + * new_desc - New object if dest_desc is obsoleted + * walk_state - Current walk state + * + * RETURN: Status + * + * DESCRIPTION: "Store" an object to another object. This may include + * converting the source type to the target type (implicit + * conversion), and a copy of the value of the source to + * the target. + * + * The Assignment of an object to another (not named) object + * is handled here. + * The Source passed in will replace the current value (if any) + * with the input value. + * + * When storing into an object the data is converted to the + * target object type then stored in the object. This means + * that the target object type (for an initialized target) will + * not be changed by a store operation. + * + * This module allows destination types of Number, String, + * Buffer, and Package. + * + * Assumes parameters are already validated. NOTE: source_desc + * resolution (from a reference object) must be performed by + * the caller if necessary. + * + ******************************************************************************/ + +acpi_status +acpi_ex_store_object_to_object ( + union acpi_operand_object *source_desc, + union acpi_operand_object *dest_desc, + union acpi_operand_object **new_desc, + struct acpi_walk_state *walk_state) +{ + union acpi_operand_object *actual_src_desc; + acpi_status status = AE_OK; + + + ACPI_FUNCTION_TRACE_PTR ("ex_store_object_to_object", source_desc); + + + actual_src_desc = source_desc; + if (!dest_desc) { + /* + * There is no destination object (An uninitialized node or + * package element), so we can simply copy the source object + * creating a new destination object + */ + status = acpi_ut_copy_iobject_to_iobject (actual_src_desc, new_desc, walk_state); + return_ACPI_STATUS (status); + } + + if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_GET_OBJECT_TYPE (dest_desc)) { + /* + * The source type does not match the type of the destination. + * Perform the "implicit conversion" of the source to the current type + * of the target as per the ACPI specification. + * + * If no conversion performed, actual_src_desc = source_desc. + * Otherwise, actual_src_desc is a temporary object to hold the + * converted object. + */ + status = acpi_ex_convert_to_target_type (ACPI_GET_OBJECT_TYPE (dest_desc), + source_desc, &actual_src_desc, walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + if (source_desc == actual_src_desc) { + /* + * No conversion was performed. Return the source_desc as the + * new object. + */ + *new_desc = source_desc; + return_ACPI_STATUS (AE_OK); + } + } + + /* + * We now have two objects of identical types, and we can perform a + * copy of the *value* of the source object. + */ + switch (ACPI_GET_OBJECT_TYPE (dest_desc)) { + case ACPI_TYPE_INTEGER: + + dest_desc->integer.value = actual_src_desc->integer.value; + + /* Truncate value if we are executing from a 32-bit ACPI table */ + + acpi_ex_truncate_for32bit_table (dest_desc); + break; + + case ACPI_TYPE_STRING: + + status = acpi_ex_store_string_to_string (actual_src_desc, dest_desc); + break; + + case ACPI_TYPE_BUFFER: + + /* + * Note: There is different store behavior depending on the original + * source type + */ + status = acpi_ex_store_buffer_to_buffer (actual_src_desc, dest_desc); + break; + + case ACPI_TYPE_PACKAGE: + + status = acpi_ut_copy_iobject_to_iobject (actual_src_desc, &dest_desc, + walk_state); + break; + + default: + /* + * All other types come here. + */ + ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Store into type %s not implemented\n", + acpi_ut_get_object_type_name (dest_desc))); + + status = AE_NOT_IMPLEMENTED; + break; + } + + if (actual_src_desc != source_desc) { + /* Delete the intermediate (temporary) source object */ + + acpi_ut_remove_reference (actual_src_desc); + } + + *new_desc = dest_desc; + return_ACPI_STATUS (status); +} + + |