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linux-next/drivers/acpi/acpica/dsutils.c
Bob Moore 56a3d5e755 ACPICA: Add infrastructure for External() opcode. 
ACPICA commit d115fe2ffdab449d6107d58580c5afd0a81d65fe

This change adds the basic low-level infrastructure for the External
AML opcode. The interpreter will simply ignore this op, as the op
is intended for use by the disassembler only.

Note that External() opcode is useful for disassembler, interpreter
can simply ignore it and still return exceptions for unknown control
methods so the kernel part only includes the grammar definition of
External() opcode in order to ignore it but doesn't interpret it.

Link: https://github.com/acpica/acpica/commit/d115fe2f
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-14 14:51:54 +02:00

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/*******************************************************************************
*
* Module Name: dsutils - Dispatcher utilities
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2015, 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 "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acdebug.h"
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsutils")
/*******************************************************************************
*
* FUNCTION: acpi_ds_clear_implicit_return
*
* PARAMETERS: walk_state - Current State
*
* RETURN: None.
*
* DESCRIPTION: Clear and remove a reference on an implicit return value. Used
* to delete "stale" return values (if enabled, the return value
* from every operator is saved at least momentarily, in case the
* parent method exits.)
*
******************************************************************************/
void acpi_ds_clear_implicit_return(struct acpi_walk_state *walk_state)
{
ACPI_FUNCTION_NAME(ds_clear_implicit_return);
/*
* Slack must be enabled for this feature
*/
if (!acpi_gbl_enable_interpreter_slack) {
return;
}
if (walk_state->implicit_return_obj) {
/*
* Delete any "stale" implicit return. However, in
* complex statements, the implicit return value can be
* bubbled up several levels.
*/
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Removing reference on stale implicit return obj %p\n",
walk_state->implicit_return_obj));
acpi_ut_remove_reference(walk_state->implicit_return_obj);
walk_state->implicit_return_obj = NULL;
}
}
#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
*
* FUNCTION: acpi_ds_do_implicit_return
*
* PARAMETERS: return_desc - The return value
* walk_state - Current State
* add_reference - True if a reference should be added to the
* return object
*
* RETURN: TRUE if implicit return enabled, FALSE otherwise
*
* DESCRIPTION: Implements the optional "implicit return". We save the result
* of every ASL operator and control method invocation in case the
* parent method exit. Before storing a new return value, we
* delete the previous return value.
*
******************************************************************************/
u8
acpi_ds_do_implicit_return(union acpi_operand_object *return_desc,
struct acpi_walk_state *walk_state, u8 add_reference)
{
ACPI_FUNCTION_NAME(ds_do_implicit_return);
/*
* Slack must be enabled for this feature, and we must
* have a valid return object
*/
if ((!acpi_gbl_enable_interpreter_slack) || (!return_desc)) {
return (FALSE);
}
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Result %p will be implicitly returned; Prev=%p\n",
return_desc, walk_state->implicit_return_obj));
/*
* Delete any "stale" implicit return value first. However, in
* complex statements, the implicit return value can be
* bubbled up several levels, so we don't clear the value if it
* is the same as the return_desc.
*/
if (walk_state->implicit_return_obj) {
if (walk_state->implicit_return_obj == return_desc) {
return (TRUE);
}
acpi_ds_clear_implicit_return(walk_state);
}
/* Save the implicit return value, add a reference if requested */
walk_state->implicit_return_obj = return_desc;
if (add_reference) {
acpi_ut_add_reference(return_desc);
}
return (TRUE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_is_result_used
*
* PARAMETERS: op - Current Op
* walk_state - Current State
*
* RETURN: TRUE if result is used, FALSE otherwise
*
* DESCRIPTION: Check if a result object will be used by the parent
*
******************************************************************************/
u8
acpi_ds_is_result_used(union acpi_parse_object * op,
struct acpi_walk_state * walk_state)
{
const struct acpi_opcode_info *parent_info;
ACPI_FUNCTION_TRACE_PTR(ds_is_result_used, op);
/* Must have both an Op and a Result Object */
if (!op) {
ACPI_ERROR((AE_INFO, "Null Op"));
return_UINT8(TRUE);
}
/*
* We know that this operator is not a
* Return() operator (would not come here.) The following code is the
* optional support for a so-called "implicit return". Some AML code
* assumes that the last value of the method is "implicitly" returned
* to the caller. Just save the last result as the return value.
* NOTE: this is optional because the ASL language does not actually
* support this behavior.
*/
(void)acpi_ds_do_implicit_return(walk_state->result_obj, walk_state,
TRUE);
/*
* Now determine if the parent will use the result
*
* If there is no parent, or the parent is a scope_op, we are executing
* at the method level. An executing method typically has no parent,
* since each method is parsed separately. A method invoked externally
* via execute_control_method has a scope_op as the parent.
*/
if ((!op->common.parent) ||
(op->common.parent->common.aml_opcode == AML_SCOPE_OP)) {
/* No parent, the return value cannot possibly be used */
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"At Method level, result of [%s] not used\n",
acpi_ps_get_opcode_name(op->common.
aml_opcode)));
return_UINT8(FALSE);
}
/* Get info on the parent. The root_op is AML_SCOPE */
parent_info =
acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode);
if (parent_info->class == AML_CLASS_UNKNOWN) {
ACPI_ERROR((AE_INFO, "Unknown parent opcode Op=%p", op));
return_UINT8(FALSE);
}
/*
* Decide what to do with the result based on the parent. If
* the parent opcode will not use the result, delete the object.
* Otherwise leave it as is, it will be deleted when it is used
* as an operand later.
*/
switch (parent_info->class) {
case AML_CLASS_CONTROL:
switch (op->common.parent->common.aml_opcode) {
case AML_RETURN_OP:
/* Never delete the return value associated with a return opcode */
goto result_used;
case AML_IF_OP:
case AML_WHILE_OP:
/*
* If we are executing the predicate AND this is the predicate op,
* we will use the return value
*/
if ((walk_state->control_state->common.state ==
ACPI_CONTROL_PREDICATE_EXECUTING)
&& (walk_state->control_state->control.
predicate_op == op)) {
goto result_used;
}
break;
default:
/* Ignore other control opcodes */
break;
}
/* The general control opcode returns no result */
goto result_not_used;
case AML_CLASS_CREATE:
/*
* These opcodes allow term_arg(s) as operands and therefore
* the operands can be method calls. The result is used.
*/
goto result_used;
case AML_CLASS_NAMED_OBJECT:
if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||
(op->common.parent->common.aml_opcode == AML_DATA_REGION_OP)
|| (op->common.parent->common.aml_opcode == AML_PACKAGE_OP)
|| (op->common.parent->common.aml_opcode ==
AML_VAR_PACKAGE_OP)
|| (op->common.parent->common.aml_opcode == AML_BUFFER_OP)
|| (op->common.parent->common.aml_opcode ==
AML_INT_EVAL_SUBTREE_OP)
|| (op->common.parent->common.aml_opcode ==
AML_BANK_FIELD_OP)) {
/*
* These opcodes allow term_arg(s) as operands and therefore
* the operands can be method calls. The result is used.
*/
goto result_used;
}
goto result_not_used;
default:
/*
* In all other cases. the parent will actually use the return
* object, so keep it.
*/
goto result_used;
}
result_used:
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Result of [%s] used by Parent [%s] Op=%p\n",
acpi_ps_get_opcode_name(op->common.aml_opcode),
acpi_ps_get_opcode_name(op->common.parent->common.
aml_opcode), op));
return_UINT8(TRUE);
result_not_used:
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Result of [%s] not used by Parent [%s] Op=%p\n",
acpi_ps_get_opcode_name(op->common.aml_opcode),
acpi_ps_get_opcode_name(op->common.parent->common.
aml_opcode), op));
return_UINT8(FALSE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_delete_result_if_not_used
*
* PARAMETERS: op - Current parse Op
* result_obj - Result of the operation
* walk_state - Current state
*
* RETURN: Status
*
* DESCRIPTION: Used after interpretation of an opcode. If there is an internal
* result descriptor, check if the parent opcode will actually use
* this result. If not, delete the result now so that it will
* not become orphaned.
*
******************************************************************************/
void
acpi_ds_delete_result_if_not_used(union acpi_parse_object *op,
union acpi_operand_object *result_obj,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ds_delete_result_if_not_used, result_obj);
if (!op) {
ACPI_ERROR((AE_INFO, "Null Op"));
return_VOID;
}
if (!result_obj) {
return_VOID;
}
if (!acpi_ds_is_result_used(op, walk_state)) {
/* Must pop the result stack (obj_desc should be equal to result_obj) */
status = acpi_ds_result_pop(&obj_desc, walk_state);
if (ACPI_SUCCESS(status)) {
acpi_ut_remove_reference(result_obj);
}
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_resolve_operands
*
* PARAMETERS: walk_state - Current walk state with operands on stack
*
* RETURN: Status
*
* DESCRIPTION: Resolve all operands to their values. Used to prepare
* arguments to a control method invocation (a call from one
* method to another.)
*
******************************************************************************/
acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state)
{
u32 i;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state);
/*
* Attempt to resolve each of the valid operands
* Method arguments are passed by reference, not by value. This means
* that the actual objects are passed, not copies of the objects.
*/
for (i = 0; i < walk_state->num_operands; i++) {
status =
acpi_ex_resolve_to_value(&walk_state->operands[i],
walk_state);
if (ACPI_FAILURE(status)) {
break;
}
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_clear_operands
*
* PARAMETERS: walk_state - Current walk state with operands on stack
*
* RETURN: None
*
* DESCRIPTION: Clear all operands on the current walk state operand stack.
*
******************************************************************************/
void acpi_ds_clear_operands(struct acpi_walk_state *walk_state)
{
u32 i;
ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state);
/* Remove a reference on each operand on the stack */
for (i = 0; i < walk_state->num_operands; i++) {
/*
* Remove a reference to all operands, including both
* "Arguments" and "Targets".
*/
acpi_ut_remove_reference(walk_state->operands[i]);
walk_state->operands[i] = NULL;
}
walk_state->num_operands = 0;
return_VOID;
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_operand
*
* PARAMETERS: walk_state - Current walk state
* arg - Parse object for the argument
* arg_index - Which argument (zero based)
*
* RETURN: Status
*
* DESCRIPTION: Translate a parse tree object that is an argument to an AML
* opcode to the equivalent interpreter object. This may include
* looking up a name or entering a new name into the internal
* namespace.
*
******************************************************************************/
acpi_status
acpi_ds_create_operand(struct acpi_walk_state *walk_state,
union acpi_parse_object *arg, u32 arg_index)
{
acpi_status status = AE_OK;
char *name_string;
u32 name_length;
union acpi_operand_object *obj_desc;
union acpi_parse_object *parent_op;
u16 opcode;
acpi_interpreter_mode interpreter_mode;
const struct acpi_opcode_info *op_info;
ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg);
/* A valid name must be looked up in the namespace */
if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
(arg->common.value.string) &&
!(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n",
arg));
/* Get the entire name string from the AML stream */
status =
acpi_ex_get_name_string(ACPI_TYPE_ANY,
arg->common.value.buffer,
&name_string, &name_length);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* All prefixes have been handled, and the name is in name_string */
/*
* Special handling for buffer_field declarations. This is a deferred
* opcode that unfortunately defines the field name as the last
* parameter instead of the first. We get here when we are performing
* the deferred execution, so the actual name of the field is already
* in the namespace. We don't want to attempt to look it up again
* because we may be executing in a different scope than where the
* actual opcode exists.
*/
if ((walk_state->deferred_node) &&
(walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD)
&& (arg_index ==
(u32) ((walk_state->opcode ==
AML_CREATE_FIELD_OP) ? 3 : 2))) {
obj_desc =
ACPI_CAST_PTR(union acpi_operand_object,
walk_state->deferred_node);
status = AE_OK;
} else { /* All other opcodes */
/*
* Differentiate between a namespace "create" operation
* versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
* IMODE_EXECUTE) in order to support the creation of
* namespace objects during the execution of control methods.
*/
parent_op = arg->common.parent;
op_info =
acpi_ps_get_opcode_info(parent_op->common.
aml_opcode);
if ((op_info->flags & AML_NSNODE)
&& (parent_op->common.aml_opcode !=
AML_INT_METHODCALL_OP)
&& (parent_op->common.aml_opcode != AML_REGION_OP)
&& (parent_op->common.aml_opcode !=
AML_INT_NAMEPATH_OP)) {
/* Enter name into namespace if not found */
interpreter_mode = ACPI_IMODE_LOAD_PASS2;
} else {
/* Return a failure if name not found */
interpreter_mode = ACPI_IMODE_EXECUTE;
}
status =
acpi_ns_lookup(walk_state->scope_info, name_string,
ACPI_TYPE_ANY, interpreter_mode,
ACPI_NS_SEARCH_PARENT |
ACPI_NS_DONT_OPEN_SCOPE, walk_state,
ACPI_CAST_INDIRECT_PTR(struct
acpi_namespace_node,
&obj_desc));
/*
* The only case where we pass through (ignore) a NOT_FOUND
* error is for the cond_ref_of opcode.
*/
if (status == AE_NOT_FOUND) {
if (parent_op->common.aml_opcode ==
AML_COND_REF_OF_OP) {
/*
* For the Conditional Reference op, it's OK if
* the name is not found; We just need a way to
* indicate this to the interpreter, set the
* object to the root
*/
obj_desc =
ACPI_CAST_PTR(union
acpi_operand_object,
acpi_gbl_root_node);
status = AE_OK;
} else if (parent_op->common.aml_opcode ==
AML_EXTERNAL_OP) {
/* TBD: May only be temporary */
obj_desc =
acpi_ut_create_string_object((acpi_size) name_length);
ACPI_STRNCPY(obj_desc->string.pointer,
name_string, name_length);
status = AE_OK;
} else {
/*
* We just plain didn't find it -- which is a
* very serious error at this point
*/
status = AE_AML_NAME_NOT_FOUND;
}
}
if (ACPI_FAILURE(status)) {
ACPI_ERROR_NAMESPACE(name_string, status);
}
}
/* Free the namestring created above */
ACPI_FREE(name_string);
/* Check status from the lookup */
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Put the resulting object onto the current object stack */
status = acpi_ds_obj_stack_push(obj_desc, walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object
(obj_desc, walk_state));
} else {
/* Check for null name case */
if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
!(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
/*
* If the name is null, this means that this is an
* optional result parameter that was not specified
* in the original ASL. Create a Zero Constant for a
* placeholder. (Store to a constant is a Noop.)
*/
opcode = AML_ZERO_OP; /* Has no arguments! */
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Null namepath: Arg=%p\n", arg));
} else {
opcode = arg->common.aml_opcode;
}
/* Get the object type of the argument */
op_info = acpi_ps_get_opcode_info(opcode);
if (op_info->object_type == ACPI_TYPE_INVALID) {
return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
}
if ((op_info->flags & AML_HAS_RETVAL)
|| (arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Argument previously created, already stacked\n"));
ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object
(walk_state->
operands[walk_state->num_operands -
1], walk_state));
/*
* Use value that was already previously returned
* by the evaluation of this argument
*/
status = acpi_ds_result_pop(&obj_desc, walk_state);
if (ACPI_FAILURE(status)) {
/*
* Only error is underflow, and this indicates
* a missing or null operand!
*/
ACPI_EXCEPTION((AE_INFO, status,
"Missing or null operand"));
return_ACPI_STATUS(status);
}
} else {
/* Create an ACPI_INTERNAL_OBJECT for the argument */
obj_desc =
acpi_ut_create_internal_object(op_info->
object_type);
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Initialize the new object */
status =
acpi_ds_init_object_from_op(walk_state, arg, opcode,
&obj_desc);
if (ACPI_FAILURE(status)) {
acpi_ut_delete_object_desc(obj_desc);
return_ACPI_STATUS(status);
}
}
/* Put the operand object on the object stack */
status = acpi_ds_obj_stack_push(obj_desc, walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object
(obj_desc, walk_state));
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_operands
*
* PARAMETERS: walk_state - Current state
* first_arg - First argument of a parser argument tree
*
* RETURN: Status
*
* DESCRIPTION: Convert an operator's arguments from a parse tree format to
* namespace objects and place those argument object on the object
* stack in preparation for evaluation by the interpreter.
*
******************************************************************************/
acpi_status
acpi_ds_create_operands(struct acpi_walk_state *walk_state,
union acpi_parse_object *first_arg)
{
acpi_status status = AE_OK;
union acpi_parse_object *arg;
union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS];
u32 arg_count = 0;
u32 index = walk_state->num_operands;
u32 i;
ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg);
/* Get all arguments in the list */
arg = first_arg;
while (arg) {
if (index >= ACPI_OBJ_NUM_OPERANDS) {
return_ACPI_STATUS(AE_BAD_DATA);
}
arguments[index] = arg;
walk_state->operands[index] = NULL;
/* Move on to next argument, if any */
arg = arg->common.next;
arg_count++;
index++;
}
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"NumOperands %d, ArgCount %d, Index %d\n",
walk_state->num_operands, arg_count, index));
/* Create the interpreter arguments, in reverse order */
index--;
for (i = 0; i < arg_count; i++) {
arg = arguments[index];
walk_state->operand_index = (u8)index;
status = acpi_ds_create_operand(walk_state, arg, index);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"Created Arg #%u (%p) %u args total\n",
index, arg, arg_count));
index--;
}
return_ACPI_STATUS(status);
cleanup:
/*
* We must undo everything done above; meaning that we must
* pop everything off of the operand stack and delete those
* objects
*/
acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state);
ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index));
return_ACPI_STATUS(status);
}
/*****************************************************************************
*
* FUNCTION: acpi_ds_evaluate_name_path
*
* PARAMETERS: walk_state - Current state of the parse tree walk,
* the opcode of current operation should be
* AML_INT_NAMEPATH_OP
*
* RETURN: Status
*
* DESCRIPTION: Translate the -name_path- parse tree object to the equivalent
* interpreter object, convert it to value, if needed, duplicate
* it, if needed, and push it onto the current result stack.
*
****************************************************************************/
acpi_status acpi_ds_evaluate_name_path(struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_parse_object *op = walk_state->op;
union acpi_operand_object **operand = &walk_state->operands[0];
union acpi_operand_object *new_obj_desc;
u8 type;
ACPI_FUNCTION_TRACE_PTR(ds_evaluate_name_path, walk_state);
if (!op->common.parent) {
/* This happens after certain exception processing */
goto exit;
}
if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_REF_OF_OP)) {
/* TBD: Should we specify this feature as a bit of op_info->Flags of these opcodes? */
goto exit;
}
status = acpi_ds_create_operand(walk_state, op, 0);
if (ACPI_FAILURE(status)) {
goto exit;
}
if (op->common.flags & ACPI_PARSEOP_TARGET) {
new_obj_desc = *operand;
goto push_result;
}
type = (*operand)->common.type;
status = acpi_ex_resolve_to_value(operand, walk_state);
if (ACPI_FAILURE(status)) {
goto exit;
}
if (type == ACPI_TYPE_INTEGER) {
/* It was incremented by acpi_ex_resolve_to_value */
acpi_ut_remove_reference(*operand);
status =
acpi_ut_copy_iobject_to_iobject(*operand, &new_obj_desc,
walk_state);
if (ACPI_FAILURE(status)) {
goto exit;
}
} else {
/*
* The object either was anew created or is
* a Namespace node - don't decrement it.
*/
new_obj_desc = *operand;
}
/* Cleanup for name-path operand */
status = acpi_ds_obj_stack_pop(1, walk_state);
if (ACPI_FAILURE(status)) {
walk_state->result_obj = new_obj_desc;
goto exit;
}
push_result:
walk_state->result_obj = new_obj_desc;
status = acpi_ds_result_push(walk_state->result_obj, walk_state);
if (ACPI_SUCCESS(status)) {
/* Force to take it from stack */
op->common.flags |= ACPI_PARSEOP_IN_STACK;
}
exit:
return_ACPI_STATUS(status);
}
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