503 lines
15 KiB
C
503 lines
15 KiB
C
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/******************************************************************************
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*
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* Module Name: exstore - AML Interpreter object store support
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2012, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acdispat.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exstore")
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/* Local prototypes */
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static acpi_status
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acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
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union acpi_operand_object *dest_desc,
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struct acpi_walk_state *walk_state);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store
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*
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* PARAMETERS: *source_desc - Value to be stored
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* *dest_desc - Where to store it. Must be an NS node
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* or a union acpi_operand_object of type
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* Reference;
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* walk_state - Current walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Store the value described by source_desc into the location
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* described by dest_desc. Called by various interpreter
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* functions to store the result of an operation into
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* the destination operand -- not just simply the actual "Store"
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* ASL operator.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store(union acpi_operand_object *source_desc,
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union acpi_operand_object *dest_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status = AE_OK;
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union acpi_operand_object *ref_desc = dest_desc;
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ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
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/* Validate parameters */
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if (!source_desc || !dest_desc) {
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ACPI_ERROR((AE_INFO, "Null parameter"));
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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/* dest_desc can be either a namespace node or an ACPI object */
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if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
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/*
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* Dest is a namespace node,
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* Storing an object into a Named node.
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*/
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status = acpi_ex_store_object_to_node(source_desc,
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(struct
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acpi_namespace_node *)
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dest_desc, walk_state,
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ACPI_IMPLICIT_CONVERSION);
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return_ACPI_STATUS(status);
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}
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/* Destination object must be a Reference or a Constant object */
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switch (dest_desc->common.type) {
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case ACPI_TYPE_LOCAL_REFERENCE:
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break;
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case ACPI_TYPE_INTEGER:
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/* Allow stores to Constants -- a Noop as per ACPI spec */
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if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
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return_ACPI_STATUS(AE_OK);
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}
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/*lint -fallthrough */
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default:
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/* Destination is not a Reference object */
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ACPI_ERROR((AE_INFO,
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"Target is not a Reference or Constant object - %s [%p]",
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acpi_ut_get_object_type_name(dest_desc),
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dest_desc));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* Examine the Reference class. These cases are handled:
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*
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* 1) Store to Name (Change the object associated with a name)
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* 2) Store to an indexed area of a Buffer or Package
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* 3) Store to a Method Local or Arg
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* 4) Store to the debug object
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*/
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switch (ref_desc->reference.class) {
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case ACPI_REFCLASS_REFOF:
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/* Storing an object into a Name "container" */
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status = acpi_ex_store_object_to_node(source_desc,
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ref_desc->reference.
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object, walk_state,
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ACPI_IMPLICIT_CONVERSION);
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break;
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case ACPI_REFCLASS_INDEX:
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/* Storing to an Index (pointer into a packager or buffer) */
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status =
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acpi_ex_store_object_to_index(source_desc, ref_desc,
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walk_state);
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break;
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case ACPI_REFCLASS_LOCAL:
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case ACPI_REFCLASS_ARG:
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/* Store to a method local/arg */
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status =
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acpi_ds_store_object_to_local(ref_desc->reference.class,
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ref_desc->reference.value,
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source_desc, walk_state);
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break;
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case ACPI_REFCLASS_DEBUG:
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/*
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* Storing to the Debug object causes the value stored to be
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* displayed and otherwise has no effect -- see ACPI Specification
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"**** Write to Debug Object: Object %p %s ****:\n\n",
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source_desc,
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acpi_ut_get_object_type_name(source_desc)));
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ACPI_DEBUG_OBJECT(source_desc, 0, 0);
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break;
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default:
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ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
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ref_desc->reference.class));
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ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
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status = AE_AML_INTERNAL;
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break;
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_object_to_index
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*
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* PARAMETERS: *source_desc - Value to be stored
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* *dest_desc - Named object to receive the value
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* walk_state - Current walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Store the object to indexed Buffer or Package element
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
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union acpi_operand_object *index_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status = AE_OK;
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *new_desc;
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u8 value = 0;
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u32 i;
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ACPI_FUNCTION_TRACE(ex_store_object_to_index);
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/*
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* Destination must be a reference pointer, and
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* must point to either a buffer or a package
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*/
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switch (index_desc->reference.target_type) {
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case ACPI_TYPE_PACKAGE:
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/*
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* Storing to a package element. Copy the object and replace
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* any existing object with the new object. No implicit
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* conversion is performed.
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*
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* The object at *(index_desc->Reference.Where) is the
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* element within the package that is to be modified.
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* The parent package object is at index_desc->Reference.Object
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*/
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obj_desc = *(index_desc->reference.where);
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if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
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source_desc->reference.class == ACPI_REFCLASS_TABLE) {
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/* This is a DDBHandle, just add a reference to it */
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acpi_ut_add_reference(source_desc);
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new_desc = source_desc;
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} else {
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/* Normal object, copy it */
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status =
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acpi_ut_copy_iobject_to_iobject(source_desc,
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&new_desc,
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walk_state);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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if (obj_desc) {
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/* Decrement reference count by the ref count of the parent package */
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for (i = 0; i < ((union acpi_operand_object *)
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index_desc->reference.object)->common.
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reference_count; i++) {
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acpi_ut_remove_reference(obj_desc);
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}
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}
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*(index_desc->reference.where) = new_desc;
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/* Increment ref count by the ref count of the parent package-1 */
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for (i = 1; i < ((union acpi_operand_object *)
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index_desc->reference.object)->common.
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reference_count; i++) {
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acpi_ut_add_reference(new_desc);
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}
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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/*
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* Store into a Buffer or String (not actually a real buffer_field)
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* at a location defined by an Index.
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*
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* The first 8-bit element of the source object is written to the
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* 8-bit Buffer location defined by the Index destination object,
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* according to the ACPI 2.0 specification.
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*/
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/*
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* Make sure the target is a Buffer or String. An error should
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* not happen here, since the reference_object was constructed
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* by the INDEX_OP code.
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*/
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obj_desc = index_desc->reference.object;
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if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
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(obj_desc->common.type != ACPI_TYPE_STRING)) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* The assignment of the individual elements will be slightly
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* different for each source type.
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*/
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switch (source_desc->common.type) {
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case ACPI_TYPE_INTEGER:
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/* Use the least-significant byte of the integer */
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value = (u8) (source_desc->integer.value);
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break;
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case ACPI_TYPE_BUFFER:
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case ACPI_TYPE_STRING:
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/* Note: Takes advantage of common string/buffer fields */
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value = source_desc->buffer.pointer[0];
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break;
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default:
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/* All other types are invalid */
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ACPI_ERROR((AE_INFO,
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"Source must be Integer/Buffer/String type, not %s",
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acpi_ut_get_object_type_name(source_desc)));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/* Store the source value into the target buffer byte */
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obj_desc->buffer.pointer[index_desc->reference.value] = value;
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break;
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default:
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ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
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status = AE_AML_OPERAND_TYPE;
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break;
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_object_to_node
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*
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* PARAMETERS: source_desc - Value to be stored
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* Node - Named object to receive the value
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* walk_state - Current walk state
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* implicit_conversion - Perform implicit conversion (yes/no)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Store the object to the named object.
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*
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* The Assignment of an object to a named object is handled here
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* The value passed in will replace the current value (if any)
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* with the input value.
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*
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* When storing into an object the data is converted to the
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* target object type then stored in the object. This means
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* that the target object type (for an initialized target) will
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* not be changed by a store operation.
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*
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* Assumes parameters are already validated.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
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|
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struct acpi_namespace_node *node,
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struct acpi_walk_state *walk_state,
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|
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u8 implicit_conversion)
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{
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acpi_status status = AE_OK;
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||
|
|
union acpi_operand_object *target_desc;
|
||
|
|
union acpi_operand_object *new_desc;
|
||
|
|
acpi_object_type target_type;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
|
||
|
|
|
||
|
|
/* Get current type of the node, and object attached to Node */
|
||
|
|
|
||
|
|
target_type = acpi_ns_get_type(node);
|
||
|
|
target_desc = acpi_ns_get_attached_object(node);
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
|
||
|
|
source_desc,
|
||
|
|
acpi_ut_get_object_type_name(source_desc), node,
|
||
|
|
acpi_ut_get_type_name(target_type)));
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Resolve the source object to an actual value
|
||
|
|
* (If it is a reference object)
|
||
|
|
*/
|
||
|
|
status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* If no implicit conversion, drop into the default case below */
|
||
|
|
|
||
|
|
if ((!implicit_conversion) ||
|
||
|
|
((walk_state->opcode == AML_COPY_OP) &&
|
||
|
|
(target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
|
||
|
|
(target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
|
||
|
|
(target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
|
||
|
|
/*
|
||
|
|
* Force execution of default (no implicit conversion). Note:
|
||
|
|
* copy_object does not perform an implicit conversion, as per the ACPI
|
||
|
|
* spec -- except in case of region/bank/index fields -- because these
|
||
|
|
* objects must retain their original type permanently.
|
||
|
|
*/
|
||
|
|
target_type = ACPI_TYPE_ANY;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do the actual store operation */
|
||
|
|
|
||
|
|
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:
|
||
|
|
|
||
|
|
/* For fields, copy the source data to the target field. */
|
||
|
|
|
||
|
|
status = acpi_ex_write_data_to_field(source_desc, target_desc,
|
||
|
|
&walk_state->result_obj);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ACPI_TYPE_INTEGER:
|
||
|
|
case ACPI_TYPE_STRING:
|
||
|
|
case ACPI_TYPE_BUFFER:
|
||
|
|
|
||
|
|
/*
|
||
|
|
* These target types are all of type Integer/String/Buffer, and
|
||
|
|
* therefore support implicit conversion before the store.
|
||
|
|
*
|
||
|
|
* Copy and/or convert the source object to a new target object
|
||
|
|
*/
|
||
|
|
status =
|
||
|
|
acpi_ex_store_object_to_object(source_desc, target_desc,
|
||
|
|
&new_desc, walk_state);
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (new_desc != target_desc) {
|
||
|
|
/*
|
||
|
|
* Store the new new_desc as the new value of the Name, and set
|
||
|
|
* the Name's type to that of the value being stored in it.
|
||
|
|
* source_desc reference count is incremented by attach_object.
|
||
|
|
*
|
||
|
|
* Note: This may change the type of the node if an explicit store
|
||
|
|
* has been performed such that the node/object type has been
|
||
|
|
* changed.
|
||
|
|
*/
|
||
|
|
status =
|
||
|
|
acpi_ns_attach_object(node, new_desc,
|
||
|
|
new_desc->common.type);
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Store %s into %s via Convert/Attach\n",
|
||
|
|
acpi_ut_get_object_type_name
|
||
|
|
(source_desc),
|
||
|
|
acpi_ut_get_object_type_name
|
||
|
|
(new_desc)));
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Storing %s (%p) directly into node (%p) with no implicit conversion\n",
|
||
|
|
acpi_ut_get_object_type_name(source_desc),
|
||
|
|
source_desc, node));
|
||
|
|
|
||
|
|
/* No conversions for all other types. Just attach the source object */
|
||
|
|
|
||
|
|
status = acpi_ns_attach_object(node, source_desc,
|
||
|
|
source_desc->common.type);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|