dsutils.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

			 * by the evaluation of this argument
			 */

			status = acpi_ds_result_pop_from_bottom (&obj_desc, walk_state);
			if (ACPI_FAILURE (status)) {
				/*
				 * Only error is underflow, and this indicates
				 * a missing or null operand!
				 */
				return (status);
			}

		}

		else {
			/* Create an ACPI_INTERNAL_OBJECT for the argument */

			obj_desc = acpi_cm_create_internal_object (data_type);
			if (!obj_desc) {
				return (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_cm_delete_object_desc (obj_desc);
				return (status);
			}
	   }

		/* Put the operand object on the object stack */

		status = acpi_ds_obj_stack_push (obj_desc, walk_state);
		if (ACPI_FAILURE (status)) {
			return (status);
		}

		DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
	}

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_create_operands
 *
 * PARAMETERS:  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 (
	ACPI_WALK_STATE         *walk_state,
	ACPI_PARSE_OBJECT       *first_arg)
{
	ACPI_STATUS             status = AE_OK;
	ACPI_PARSE_OBJECT       *arg;
	u32                     arg_count = 0;


	/* For all arguments in the list... */

	arg = first_arg;
	while (arg) {
		status = acpi_ds_create_operand (walk_state, arg, arg_count);
		if (ACPI_FAILURE (status)) {
			goto cleanup;
		}

		/* Move on to next argument, if any */

		arg = arg->next;
		arg_count++;
	}

	return (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);

	return (status);
}


/*******************************************************************************
 *
 * 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 (
	ACPI_WALK_STATE         *walk_state)
{
	u32                     i;
	ACPI_STATUS             status = AE_OK;


	/*
	 * Attempt to resolve each of the valid operands
	 * Method arguments are passed by value, not by reference
	 */

	/*
	 * TBD: [Investigate] Note from previous parser:
	 *   Ref_of problem with Acpi_aml_resolve_to_value() conversion.
	 */

	for (i = 0; i < walk_state->num_operands; i++) {
		status = acpi_aml_resolve_to_value (&walk_state->operands[i], walk_state);
		if (ACPI_FAILURE (status)) {
			break;
		}
	}

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_map_opcode_to_data_type
 *
 * PARAMETERS:  Opcode          - AML opcode to map
 *              Out_flags       - Additional info about the opcode
 *
 * RETURN:      The ACPI type associated with the opcode
 *
 * DESCRIPTION: Convert a raw AML opcode to the associated ACPI data type,
 *              if any.  If the opcode returns a value as part of the
 *              intepreter execution, a flag is returned in Out_flags.
 *
 ******************************************************************************/

OBJECT_TYPE_INTERNAL
acpi_ds_map_opcode_to_data_type (
	u16                     opcode,
	u32                     *out_flags)
{
	OBJECT_TYPE_INTERNAL    data_type = INTERNAL_TYPE_INVALID;
	ACPI_OPCODE_INFO        *op_info;
	u32                     flags = 0;


	op_info = acpi_ps_get_opcode_info (opcode);
	if (ACPI_GET_OP_TYPE (op_info) != ACPI_OP_TYPE_OPCODE) {
		/* Unknown opcode */

		return (data_type);
	}

	switch (ACPI_GET_OP_CLASS (op_info))
	{

	case OPTYPE_LITERAL:

		switch (opcode)
		{
		case AML_BYTE_OP:
		case AML_WORD_OP:
		case AML_DWORD_OP:

			data_type = ACPI_TYPE_NUMBER;
			break;


		case AML_STRING_OP:

			data_type = ACPI_TYPE_STRING;
			break;

		case AML_NAMEPATH_OP:
			data_type = INTERNAL_TYPE_REFERENCE;
			break;

		default:
			break;
		}
		break;


	case OPTYPE_DATA_TERM:

		switch (opcode)
		{
		case AML_BUFFER_OP:

			data_type = ACPI_TYPE_BUFFER;
			break;

		case AML_PACKAGE_OP:

			data_type = ACPI_TYPE_PACKAGE;
			break;

		default:
			break;
		}
		break;


	case OPTYPE_CONSTANT:
	case OPTYPE_METHOD_ARGUMENT:
	case OPTYPE_LOCAL_VARIABLE:

		data_type = INTERNAL_TYPE_REFERENCE;
		break;


	case OPTYPE_MONADIC2:
	case OPTYPE_MONADIC2_r:
	case OPTYPE_DYADIC2:
	case OPTYPE_DYADIC2_r:
	case OPTYPE_DYADIC2_s:
	case OPTYPE_INDEX:
	case OPTYPE_MATCH:
	case OPTYPE_RETURN:

		flags = OP_HAS_RETURN_VALUE;
		data_type = ACPI_TYPE_ANY;
		break;

	case OPTYPE_METHOD_CALL:

		flags = OP_HAS_RETURN_VALUE;
		data_type = ACPI_TYPE_METHOD;
		break;


	case OPTYPE_NAMED_OBJECT:

		data_type = acpi_ds_map_named_opcode_to_data_type (opcode);
		break;


	case OPTYPE_DYADIC1:
	case OPTYPE_CONTROL:

		/* No mapping needed at this time */

		break;


	default:

		break;
	}

	/* Return flags to caller if requested */

	if (out_flags) {
		*out_flags = flags;
	}

	return (data_type);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_map_named_opcode_to_data_type
 *
 * PARAMETERS:  Opcode              - The Named AML opcode to map
 *
 * RETURN:      The ACPI type associated with the named opcode
 *
 * DESCRIPTION: Convert a raw Named AML opcode to the associated data type.
 *              Named opcodes are a subsystem of the AML opcodes.
 *
 ******************************************************************************/

OBJECT_TYPE_INTERNAL
acpi_ds_map_named_opcode_to_data_type (
	u16                     opcode)
{
	OBJECT_TYPE_INTERNAL    data_type;


	/* Decode Opcode */

	switch (opcode)
	{
	case AML_SCOPE_OP:
		data_type = INTERNAL_TYPE_SCOPE;
		break;

	case AML_DEVICE_OP:
		data_type = ACPI_TYPE_DEVICE;
		break;

	case AML_THERMAL_ZONE_OP:
		data_type = ACPI_TYPE_THERMAL;
		break;

	case AML_METHOD_OP:
		data_type = ACPI_TYPE_METHOD;
		break;

	case AML_POWER_RES_OP:
		data_type = ACPI_TYPE_POWER;
		break;

	case AML_PROCESSOR_OP:
		data_type = ACPI_TYPE_PROCESSOR;
		break;

	case AML_DEF_FIELD_OP:                          /* Def_field_op */
		data_type = INTERNAL_TYPE_DEF_FIELD_DEFN;
		break;

	case AML_INDEX_FIELD_OP:                        /* Index_field_op */
		data_type = INTERNAL_TYPE_INDEX_FIELD_DEFN;
		break;

	case AML_BANK_FIELD_OP:                         /* Bank_field_op */
		data_type = INTERNAL_TYPE_BANK_FIELD_DEFN;
		break;

	case AML_NAMEDFIELD_OP:                         /* NO CASE IN ORIGINAL  */
		data_type = ACPI_TYPE_ANY;
		break;

	case AML_NAME_OP:                               /* Name_op - special code in original */
	case AML_NAMEPATH_OP:
		data_type = ACPI_TYPE_ANY;
		break;

	case AML_ALIAS_OP:
		data_type = INTERNAL_TYPE_ALIAS;
		break;

	case AML_MUTEX_OP:
		data_type = ACPI_TYPE_MUTEX;
		break;

	case AML_EVENT_OP:
		data_type = ACPI_TYPE_EVENT;
		break;

	case AML_REGION_OP:
		data_type = ACPI_TYPE_REGION;
		break;


	default:
		data_type = ACPI_TYPE_ANY;
		break;

	}

	return (data_type);
}