552 lines
14 KiB
C
552 lines
14 KiB
C
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/******************************************************************************
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*
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* Module Name: exresolv - AML Interpreter object resolution
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, 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 <acpi/amlcode.h>
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#include <acpi/acdispat.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acparser.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exresolv")
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/* Local prototypes */
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static acpi_status
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acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
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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_resolve_to_value
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*
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* PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can
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* be either an (union acpi_operand_object *)
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* or an acpi_handle.
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* walk_state - Current method state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert Reference objects to values
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*
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******************************************************************************/
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acpi_status
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acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr);
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if (!stack_ptr || !*stack_ptr) {
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ACPI_ERROR((AE_INFO, "Internal - null pointer"));
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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/*
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* The entity pointed to by the stack_ptr can be either
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* 1) A valid union acpi_operand_object, or
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* 2) A struct acpi_namespace_node (named_obj)
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*/
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if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_OPERAND) {
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status = acpi_ex_resolve_object_to_value(stack_ptr, 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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if (!*stack_ptr) {
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ACPI_ERROR((AE_INFO, "Internal - null pointer"));
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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}
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/*
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* Object on the stack may have changed if acpi_ex_resolve_object_to_value()
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* was called (i.e., we can't use an _else_ here.)
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*/
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if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_NAMED) {
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status =
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acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
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(struct acpi_namespace_node,
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stack_ptr), 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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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr));
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_resolve_object_to_value
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*
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* PARAMETERS: stack_ptr - Pointer to an internal object
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* walk_state - Current method state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Retrieve the value from an internal object. The Reference type
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* uses the associated AML opcode to determine the value.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
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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 *stack_desc;
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union acpi_operand_object *obj_desc = NULL;
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u16 opcode;
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ACPI_FUNCTION_TRACE(ex_resolve_object_to_value);
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stack_desc = *stack_ptr;
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/* This is an union acpi_operand_object */
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switch (ACPI_GET_OBJECT_TYPE(stack_desc)) {
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case ACPI_TYPE_LOCAL_REFERENCE:
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opcode = stack_desc->reference.opcode;
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switch (opcode) {
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case AML_LOCAL_OP:
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case AML_ARG_OP:
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/*
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* Get the local from the method's state info
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* Note: this increments the local's object reference count
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*/
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status = acpi_ds_method_data_get_value(opcode,
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stack_desc->
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reference.offset,
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walk_state,
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&obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"[Arg/Local %X] ValueObj is %p\n",
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stack_desc->reference.offset,
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obj_desc));
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/*
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* Now we can delete the original Reference Object and
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* replace it with the resolved value
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*/
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acpi_ut_remove_reference(stack_desc);
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*stack_ptr = obj_desc;
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break;
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case AML_INDEX_OP:
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switch (stack_desc->reference.target_type) {
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case ACPI_TYPE_BUFFER_FIELD:
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/* Just return - do not dereference */
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break;
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case ACPI_TYPE_PACKAGE:
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/* If method call or copy_object - do not dereference */
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if ((walk_state->opcode ==
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AML_INT_METHODCALL_OP)
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|| (walk_state->opcode == AML_COPY_OP)) {
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break;
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}
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/* Otherwise, dereference the package_index to a package element */
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obj_desc = *stack_desc->reference.where;
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if (obj_desc) {
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/*
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* Valid object descriptor, copy pointer to return value
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* (i.e., dereference the package index)
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* Delete the ref object, increment the returned object
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*/
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acpi_ut_remove_reference(stack_desc);
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acpi_ut_add_reference(obj_desc);
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*stack_ptr = obj_desc;
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} else {
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/*
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* A NULL object descriptor means an uninitialized element of
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* the package, can't dereference it
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*/
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ACPI_ERROR((AE_INFO,
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"Attempt to dereference an Index to NULL package element Idx=%p",
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stack_desc));
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status = AE_AML_UNINITIALIZED_ELEMENT;
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}
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break;
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default:
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/* Invalid reference object */
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ACPI_ERROR((AE_INFO,
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"Unknown TargetType %X in Index/Reference object %p",
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stack_desc->reference.target_type,
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stack_desc));
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status = AE_AML_INTERNAL;
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break;
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}
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break;
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case AML_REF_OF_OP:
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case AML_DEBUG_OP:
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case AML_LOAD_OP:
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/* Just leave the object as-is, do not dereference */
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break;
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case AML_INT_NAMEPATH_OP: /* Reference to a named object */
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/* Dereference the name */
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if ((stack_desc->reference.node->type ==
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ACPI_TYPE_DEVICE)
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|| (stack_desc->reference.node->type ==
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ACPI_TYPE_THERMAL)) {
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/* These node types do not have 'real' subobjects */
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*stack_ptr = (void *)stack_desc->reference.node;
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} else {
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/* Get the object pointed to by the namespace node */
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*stack_ptr =
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(stack_desc->reference.node)->object;
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acpi_ut_add_reference(*stack_ptr);
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}
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acpi_ut_remove_reference(stack_desc);
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break;
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default:
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ACPI_ERROR((AE_INFO,
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"Unknown Reference opcode %X (%s) in %p",
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opcode, acpi_ps_get_opcode_name(opcode),
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stack_desc));
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status = AE_AML_INTERNAL;
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break;
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}
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break;
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case ACPI_TYPE_BUFFER:
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status = acpi_ds_get_buffer_arguments(stack_desc);
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break;
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case ACPI_TYPE_PACKAGE:
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status = acpi_ds_get_package_arguments(stack_desc);
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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case ACPI_TYPE_LOCAL_REGION_FIELD:
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case ACPI_TYPE_LOCAL_BANK_FIELD:
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case ACPI_TYPE_LOCAL_INDEX_FIELD:
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"FieldRead SourceDesc=%p Type=%X\n",
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stack_desc,
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ACPI_GET_OBJECT_TYPE(stack_desc)));
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status =
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acpi_ex_read_data_from_field(walk_state, stack_desc,
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&obj_desc);
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/* Remove a reference to the original operand, then override */
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acpi_ut_remove_reference(*stack_ptr);
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*stack_ptr = (void *)obj_desc;
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break;
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default:
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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_resolve_multiple
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*
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* PARAMETERS: walk_state - Current state (contains AML opcode)
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* Operand - Starting point for resolution
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* return_type - Where the object type is returned
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* return_desc - Where the resolved object is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Return the base object and type. Traverse a reference list if
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* necessary to get to the base object.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state,
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union acpi_operand_object *operand,
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acpi_object_type * return_type,
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union acpi_operand_object **return_desc)
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{
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union acpi_operand_object *obj_desc = (void *)operand;
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struct acpi_namespace_node *node;
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acpi_object_type type;
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple);
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/* Operand can be either a namespace node or an operand descriptor */
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switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
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case ACPI_DESC_TYPE_OPERAND:
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type = obj_desc->common.type;
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break;
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case ACPI_DESC_TYPE_NAMED:
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type = ((struct acpi_namespace_node *)obj_desc)->type;
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obj_desc =
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acpi_ns_get_attached_object((struct acpi_namespace_node *)
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obj_desc);
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/* If we had an Alias node, use the attached object for type info */
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if (type == ACPI_TYPE_LOCAL_ALIAS) {
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type = ((struct acpi_namespace_node *)obj_desc)->type;
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obj_desc =
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acpi_ns_get_attached_object((struct
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acpi_namespace_node *)
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obj_desc);
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}
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break;
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default:
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/* If type is anything other than a reference, we are done */
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if (type != ACPI_TYPE_LOCAL_REFERENCE) {
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goto exit;
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}
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/*
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* For reference objects created via the ref_of, Index, or Load/load_table
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* operators, we need to get to the base object (as per the ACPI
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* specification of the object_type and size_of operators). This means
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* traversing the list of possibly many nested references.
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*/
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while (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REFERENCE) {
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switch (obj_desc->reference.opcode) {
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case AML_REF_OF_OP:
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case AML_INT_NAMEPATH_OP:
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/* Dereference the reference pointer */
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if (obj_desc->reference.opcode == AML_REF_OF_OP) {
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node = obj_desc->reference.object;
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} else { /* AML_INT_NAMEPATH_OP */
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node = obj_desc->reference.node;
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}
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/* All "References" point to a NS node */
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if (ACPI_GET_DESCRIPTOR_TYPE(node) !=
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ACPI_DESC_TYPE_NAMED) {
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ACPI_ERROR((AE_INFO, "Not a NS node %p [%s]",
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node,
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acpi_ut_get_descriptor_name(node)));
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return_ACPI_STATUS(AE_AML_INTERNAL);
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}
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/* Get the attached object */
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obj_desc = acpi_ns_get_attached_object(node);
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if (!obj_desc) {
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/* No object, use the NS node type */
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type = acpi_ns_get_type(node);
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goto exit;
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}
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/* Check for circular references */
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if (obj_desc == operand) {
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return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE);
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}
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break;
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case AML_INDEX_OP:
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/* Get the type of this reference (index into another object) */
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type = obj_desc->reference.target_type;
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if (type != ACPI_TYPE_PACKAGE) {
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goto exit;
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}
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/*
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* The main object is a package, we want to get the type
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* of the individual package element that is referenced by
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* the index.
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*
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* This could of course in turn be another reference object.
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*/
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obj_desc = *(obj_desc->reference.where);
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if (!obj_desc) {
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/* NULL package elements are allowed */
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type = 0; /* Uninitialized */
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goto exit;
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}
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break;
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case AML_LOAD_OP:
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type = ACPI_TYPE_DDB_HANDLE;
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goto exit;
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case AML_LOCAL_OP:
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case AML_ARG_OP:
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if (return_desc) {
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status =
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acpi_ds_method_data_get_value(obj_desc->
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reference.
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opcode,
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obj_desc->
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reference.
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offset,
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walk_state,
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&obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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acpi_ut_remove_reference(obj_desc);
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} else {
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status =
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acpi_ds_method_data_get_node(obj_desc->
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reference.
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opcode,
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obj_desc->
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reference.
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offset,
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walk_state,
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&node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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obj_desc = acpi_ns_get_attached_object(node);
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if (!obj_desc) {
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type = ACPI_TYPE_ANY;
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goto exit;
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}
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}
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break;
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case AML_DEBUG_OP:
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/* The Debug Object is of type "DebugObject" */
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type = ACPI_TYPE_DEBUG_OBJECT;
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goto exit;
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default:
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ACPI_ERROR((AE_INFO,
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"Unknown Reference subtype %X",
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obj_desc->reference.opcode));
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return_ACPI_STATUS(AE_AML_INTERNAL);
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}
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}
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/*
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* Now we are guaranteed to have an object that has not been created
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* via the ref_of or Index operators.
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*/
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type = ACPI_GET_OBJECT_TYPE(obj_desc);
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exit:
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/* Convert internal types to external types */
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switch (type) {
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case ACPI_TYPE_LOCAL_REGION_FIELD:
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case ACPI_TYPE_LOCAL_BANK_FIELD:
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case ACPI_TYPE_LOCAL_INDEX_FIELD:
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type = ACPI_TYPE_FIELD_UNIT;
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break;
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case ACPI_TYPE_LOCAL_SCOPE:
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/* Per ACPI Specification, Scope is untyped */
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type = ACPI_TYPE_ANY;
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break;
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default:
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/* No change to Type required */
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break;
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}
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*return_type = type;
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if (return_desc) {
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*return_desc = obj_desc;
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}
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return_ACPI_STATUS(AE_OK);
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}
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