1 files changed, 869 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c
new file mode 100644
index 000000000000..9c88846ca2ce
--- /dev/null
+++ b/drivers/acpi/acpica/dsutils.c
@@ -0,0 +1,869 @@
+/*******************************************************************************
+ *
+ * Module Name: dsutils - Dispatcher utilities
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
+#include <acpi/acparser.h>
+#include <acpi/amlcode.h>
+#include <acpi/acdispat.h>
+#include <acpi/acinterp.h>
+#include <acpi/acnamesp.h>
+#include <acpi/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 {
+                                        /*
+                                         * 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++;
+        }
+
+        index--;
+
+        /* It is the appropriate order to get objects from the Result stack */
+
+        for (i = 0; i < arg_count; i++) {
+                arg = arguments[index];
+
+                /* Force the filling of the operand stack in inverse order */
+
+                walk_state->operand_index = (u8) index;
+
+                status = acpi_ds_create_operand(walk_state, arg, index);
+                if (ACPI_FAILURE(status)) {
+                        goto cleanup;
+                }
+
+                index--;
+
+                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+                                  "Arg #%d (%p) done, Arg1=%p\n", index, arg,
+                                  first_arg));
+        }
+
+        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 %d", 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 = ACPI_GET_OBJECT_TYPE(*operand);
+
+        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);
+}