Orange Pi5 kernel

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: dsutils - Dispatcher utilities
 *
 ******************************************************************************/
 
#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;
<------>}
}
 
/*******************************************************************************
 *
 * 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_BUFFER_OP)
<------><------>    || (op->common.parent->common.aml_opcode ==
<------><------><------>AML_VARIABLE_PACKAGE_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;
}
 
/*******************************************************************************
 *
 * 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_CONDITIONAL_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) {
<------><------><------><------><------>/*
<------><------><------><------><------> * This opcode should never appear here. It is used only
<------><------><------><------><------> * by AML disassemblers and is surrounded by an If(0)
<------><------><------><------><------> * by the ASL compiler.
<------><------><------><------><------> *
<------><------><------><------><------> * Therefore, if we see it here, it is a serious error.
<------><------><------><------><------> */
<------><------><------><------><------>status = AE_AML_BAD_OPCODE;
<------><------><------><------>} 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(walk_state->scope_info,
<------><------><------><------><------><------>     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_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)) {
<------><------><------>/*
<------><------><------> * 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_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_VARIABLE_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);
}