exoparg1.c

linux-2.6.15.6

	case AML_TO_BUFFER_OP:	/* to_buffer (Data, Result) */

		status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
		if (return_desc == operand[0]) {
			/* No conversion performed, add ref to handle return value */
			acpi_ut_add_reference(return_desc);
		}
		break;

	case AML_TO_INTEGER_OP:	/* to_integer (Data, Result) */

		status = acpi_ex_convert_to_integer(operand[0], &return_desc,
						    ACPI_ANY_BASE);
		if (return_desc == operand[0]) {
			/* No conversion performed, add ref to handle return value */
			acpi_ut_add_reference(return_desc);
		}
		break;

	case AML_SHIFT_LEFT_BIT_OP:	/* shift_left_bit (Source, bit_num) */
	case AML_SHIFT_RIGHT_BIT_OP:	/* shift_right_bit (Source, bit_num) */

		/* These are two obsolete opcodes */

		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "%s is obsolete and not implemented\n",
				  acpi_ps_get_opcode_name(walk_state->opcode)));
		status = AE_SUPPORT;
		goto cleanup;

	default:		/* Unknown opcode */

		ACPI_REPORT_ERROR(("acpi_ex_opcode_1A_1T_1R: Unknown opcode %X\n", walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}

	if (ACPI_SUCCESS(status)) {
		/* Store the return value computed above into the target object */

		status = acpi_ex_store(return_desc, operand[1], walk_state);
	}

      cleanup:

	if (!walk_state->result_obj) {
		walk_state->result_obj = return_desc;
	}

	/* Delete return object on error */

	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(return_desc);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
{
	union acpi_operand_object **operand = &walk_state->operands[0];
	union acpi_operand_object *temp_desc;
	union acpi_operand_object *return_desc = NULL;
	acpi_status status = AE_OK;
	u32 type;
	acpi_integer value;

	ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_0T_1R",
				acpi_ps_get_opcode_name(walk_state->opcode));

	/* Examine the AML opcode */

	switch (walk_state->opcode) {
	case AML_LNOT_OP:	/* LNot (Operand) */

		return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		/*
		 * Set result to ONES (TRUE) if Value == 0.  Note:
		 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
		 */
		if (!operand[0]->integer.value) {
			return_desc->integer.value = ACPI_INTEGER_MAX;
		}
		break;

	case AML_DECREMENT_OP:	/* Decrement (Operand)  */
	case AML_INCREMENT_OP:	/* Increment (Operand)  */

		/*
		 * Create a new integer.  Can't just get the base integer and
		 * increment it because it may be an Arg or Field.
		 */
		return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		/*
		 * Since we are expecting a Reference operand, it can be either a
		 * NS Node or an internal object.
		 */
		temp_desc = operand[0];
		if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
		    ACPI_DESC_TYPE_OPERAND) {
			/* Internal reference object - prevent deletion */

			acpi_ut_add_reference(temp_desc);
		}

		/*
		 * Convert the Reference operand to an Integer (This removes a
		 * reference on the Operand[0] object)
		 *
		 * NOTE:  We use LNOT_OP here in order to force resolution of the
		 * reference operand to an actual integer.
		 */
		status =
		    acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
					     walk_state);
		if (ACPI_FAILURE(status)) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "%s: bad operand(s) %s\n",
					  acpi_ps_get_opcode_name(walk_state->
								  opcode),
					  acpi_format_exception(status)));

			goto cleanup;
		}

		/*
		 * temp_desc is now guaranteed to be an Integer object --
		 * Perform the actual increment or decrement
		 */
		if (walk_state->opcode == AML_INCREMENT_OP) {
			return_desc->integer.value =
			    temp_desc->integer.value + 1;
		} else {
			return_desc->integer.value =
			    temp_desc->integer.value - 1;
		}

		/* Finished with this Integer object */

		acpi_ut_remove_reference(temp_desc);

		/*
		 * Store the result back (indirectly) through the original
		 * Reference object
		 */
		status = acpi_ex_store(return_desc, operand[0], walk_state);
		break;

	case AML_TYPE_OP:	/* object_type (source_object) */

		/*
		 * Note: The operand is not resolved at this point because we want to
		 * get the associated object, not its value.  For example, we don't
		 * want to resolve a field_unit to its value, we want the actual
		 * field_unit object.
		 */

		/* Get the type of the base object */

		status =
		    acpi_ex_resolve_multiple(walk_state, operand[0], &type,
					     NULL);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}
		/* Allocate a descriptor to hold the type. */

		return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		return_desc->integer.value = type;
		break;

	case AML_SIZE_OF_OP:	/* size_of (source_object) */

		/*
		 * Note: The operand is not resolved at this point because we want to
		 * get the associated object, not its value.
		 */

		/* Get the base object */

		status = acpi_ex_resolve_multiple(walk_state,
						  operand[0], &type,
						  &temp_desc);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		/*
		 * The type of the base object must be integer, buffer, string, or
		 * package.  All others are not supported.
		 *
		 * NOTE: Integer is not specifically supported by the ACPI spec,
		 * but is supported implicitly via implicit operand conversion.
		 * rather than bother with conversion, we just use the byte width
		 * global (4 or 8 bytes).
		 */
		switch (type) {
		case ACPI_TYPE_INTEGER:
			value = acpi_gbl_integer_byte_width;
			break;

		case ACPI_TYPE_BUFFER:
			value = temp_desc->buffer.length;
			break;

		case ACPI_TYPE_STRING:
			value = temp_desc->string.length;
			break;

		case ACPI_TYPE_PACKAGE:
			value = temp_desc->package.count;
			break;

		default:
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "size_of - Operand is not Buf/Int/Str/Pkg - found type %s\n",
					  acpi_ut_get_type_name(type)));
			status = AE_AML_OPERAND_TYPE;
			goto cleanup;
		}

		/*
		 * Now that we have the size of the object, create a result
		 * object to hold the value
		 */
		return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		return_desc->integer.value = value;
		break;

	case AML_REF_OF_OP:	/* ref_of (source_object) */

		status =
		    acpi_ex_get_object_reference(operand[0], &return_desc,
						 walk_state);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}
		break;

	case AML_DEREF_OF_OP:	/* deref_of (obj_reference | String) */

		/* Check for a method local or argument, or standalone String */

		if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
		    ACPI_DESC_TYPE_NAMED) {
			switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
			case ACPI_TYPE_LOCAL_REFERENCE:
				/*
				 * This is a deref_of (local_x | arg_x)
				 *
				 * Must resolve/dereference the local/arg reference first
				 */
				switch (operand[0]->reference.opcode) {
				case AML_LOCAL_OP:
				case AML_ARG_OP:

					/* Set Operand[0] to the value of the local/arg */

					status =
					    acpi_ds_method_data_get_value
					    (operand[0]->reference.opcode,
					     operand[0]->reference.offset,
					     walk_state, &temp_desc);
					if (ACPI_FAILURE(status)) {
						goto cleanup;
					}

					/*
					 * Delete our reference to the input object and
					 * point to the object just retrieved
					 */
					acpi_ut_remove_reference(operand[0]);
					operand[0] = temp_desc;
					break;

				case AML_REF_OF_OP:

					/* Get the object to which the reference refers */

					temp_desc =
					    operand[0]->reference.object;
					acpi_ut_remove_reference(operand[0]);
					operand[0] = temp_desc;
					break;

				default:

					/* Must be an Index op - handled below */
					break;
				}
				break;

			case ACPI_TYPE_STRING:

				/*
				 * This is a deref_of (String). The string is a reference
				 * to a named ACPI object.
				 *
				 * 1) Find the owning Node
				 * 2) Dereference the node to an actual object.  Could be a
				 *    Field, so we need to resolve the node to a value.
				 */
				status =
				    acpi_ns_get_node_by_path(operand[0]->string.
							     pointer,
							     walk_state->
							     scope_info->scope.
							     node,
							     ACPI_NS_SEARCH_PARENT,
							     ACPI_CAST_INDIRECT_PTR
							     (struct
							      acpi_namespace_node,
							      &return_desc));
				if (ACPI_FAILURE(status)) {
					goto cleanup;
				}

				status =
				    acpi_ex_resolve_node_to_value
				    (ACPI_CAST_INDIRECT_PTR
				     (struct acpi_namespace_node, &return_desc),
				     walk_state);
				goto cleanup;

			default:

				status = AE_AML_OPERAND_TYPE;
				goto cleanup;
			}
		}

		/* Operand[0] may have changed from the code above */

		if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
		    ACPI_DESC_TYPE_NAMED) {
			/*
			 * This is a deref_of (object_reference)
			 * Get the actual object from the Node (This is the dereference).
			 * This case may only happen when a local_x or arg_x is
			 * dereferenced above.
			 */
			return_desc = acpi_ns_get_attached_object((struct
								   acpi_namespace_node
								   *)
								  operand[0]);
			acpi_ut_add_reference(return_desc);
		} else {
			/*
			 * This must be a reference object produced by either the
			 * Index() or ref_of() operator
			 */
			switch (operand[0]->reference.opcode) {
			case AML_INDEX_OP:

				/*
				 * The target type for the Index operator must be
				 * either a Buffer or a Package
				 */
				switch (operand[0]->reference.target_type) {
				case ACPI_TYPE_BUFFER_FIELD:

					temp_desc =
					    operand[0]->reference.object;

					/*
					 * Create a new object that contains one element of the
					 * buffer -- the element pointed to by the index.
					 *
					 * NOTE: index into a buffer is NOT a pointer to a
					 * sub-buffer of the main buffer, it is only a pointer to a
					 * single element (byte) of the buffer!
					 */
					return_desc =
					    acpi_ut_create_internal_object
					    (ACPI_TYPE_INTEGER);
					if (!return_desc) {
						status = AE_NO_MEMORY;
						goto cleanup;
					}

					/*
					 * Since we are returning the value of the buffer at the
					 * indexed location, we don't need to add an additional
					 * reference to the buffer itself.
					 */
					return_desc->integer.value =
					    temp_desc->buffer.
					    pointer[operand[0]->reference.
						    offset];
					break;

				case ACPI_TYPE_PACKAGE:

					/*
					 * Return the referenced element of the package.  We must
					 * add another reference to the referenced object, however.
					 */
					return_desc =
					    *(operand[0]->reference.where);
					if (return_desc) {
						acpi_ut_add_reference
						    (return_desc);
					}

					break;

				default:

					ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
							  "Unknown Index target_type %X in obj %p\n",
							  operand[0]->reference.
							  target_type,
							  operand[0]));
					status = AE_AML_OPERAND_TYPE;
					goto cleanup;
				}
				break;

			case AML_REF_OF_OP:

				return_desc = operand[0]->reference.object;

				if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
				    ACPI_DESC_TYPE_NAMED) {

					return_desc =
					    acpi_ns_get_attached_object((struct
									 acpi_namespace_node
									 *)
									return_desc);
				}

				/* Add another reference to the object! */

				acpi_ut_add_reference(return_desc);
				break;

			default:
				ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
						  "Unknown opcode in ref(%p) - %X\n",
						  operand[0],
						  operand[0]->reference.
						  opcode));

				status = AE_TYPE;
				goto cleanup;
			}
		}
		break;

	default:

		ACPI_REPORT_ERROR(("acpi_ex_opcode_1A_0T_1R: Unknown opcode %X\n", walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}

      cleanup:

	/* Delete return object on error */

	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(return_desc);
	}

	walk_state->result_obj = return_desc;
	return_ACPI_STATUS(status);
}