rsutils.c

来自「linux 内核源代码」· C语言 代码 · 共 728 行 · 第 1/2 页

		    acpi_rs_strcpy(resource_source->string_ptr,
				   ACPI_CAST_PTR(char,
						 &aml_resource_source[1]));

		return ((acpi_rs_length) total_length);
	}

	/* resource_source is not present */

	resource_source->index = 0;
	resource_source->string_length = 0;
	resource_source->string_ptr = NULL;
	return (0);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_set_resource_source
 *
 * PARAMETERS:  Aml                 - Pointer to the raw AML descriptor
 *              minimum_length      - Minimum length of the descriptor (minus
 *                                    any optional fields)
 *              resource_source     - Internal resource_source

 *
 * RETURN:      Total length of the AML descriptor
 *
 * DESCRIPTION: Convert an optional resource_source from internal format to a
 *              raw AML resource descriptor
 *
 ******************************************************************************/

acpi_rsdesc_size
acpi_rs_set_resource_source(union aml_resource * aml,
			    acpi_rs_length minimum_length,
			    struct acpi_resource_source * resource_source)
{
	u8 *aml_resource_source;
	acpi_rsdesc_size descriptor_length;

	ACPI_FUNCTION_ENTRY();

	descriptor_length = minimum_length;

	/* Non-zero string length indicates presence of a resource_source */

	if (resource_source->string_length) {

		/* Point to the end of the AML descriptor */

		aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);

		/* Copy the resource_source_index */

		aml_resource_source[0] = (u8) resource_source->index;

		/* Copy the resource_source string */

		ACPI_STRCPY(ACPI_CAST_PTR(char, &aml_resource_source[1]),
			    resource_source->string_ptr);

		/*
		 * Add the length of the string (+ 1 for null terminator) to the
		 * final descriptor length
		 */
		descriptor_length +=
		    ((acpi_rsdesc_size) resource_source->string_length + 1);
	}

	/* Return the new total length of the AML descriptor */

	return (descriptor_length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_prt_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _PRT value of an object
 *              contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_prt_method_data(struct acpi_namespace_node * node,
			    struct acpi_buffer * ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_prt_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status = acpi_ut_evaluate_object(node, METHOD_NAME__PRT,
					 ACPI_BTYPE_PACKAGE, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Create a resource linked list from the byte stream buffer that comes
	 * back from the _CRS method execution.
	 */
	status = acpi_rs_create_pci_routing_table(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_crs_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _CRS value of an object
 *              contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_crs_method_data(struct acpi_namespace_node *node,
			    struct acpi_buffer *ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_crs_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status = acpi_ut_evaluate_object(node, METHOD_NAME__CRS,
					 ACPI_BTYPE_BUFFER, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Make the call to create a resource linked list from the
	 * byte stream buffer that comes back from the _CRS method
	 * execution.
	 */
	status = acpi_rs_create_resource_list(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_prs_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _PRS value of an object
 *              contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
			    struct acpi_buffer *ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_prs_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status = acpi_ut_evaluate_object(node, METHOD_NAME__PRS,
					 ACPI_BTYPE_BUFFER, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Make the call to create a resource linked list from the
	 * byte stream buffer that comes back from the _CRS method
	 * execution.
	 */
	status = acpi_rs_create_resource_list(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}
#endif				/*  ACPI_FUTURE_USAGE  */

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_method_data
 *
 * PARAMETERS:  Handle          - Handle to the containing object
 *              Path            - Path to method, relative to Handle
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _CRS or _PRS value of an
 *              object contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_method_data(acpi_handle handle,
			char *path, struct acpi_buffer *ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status =
	    acpi_ut_evaluate_object(handle, path, ACPI_BTYPE_BUFFER, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Make the call to create a resource linked list from the
	 * byte stream buffer that comes back from the method
	 * execution.
	 */
	status = acpi_rs_create_resource_list(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_set_srs_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              in_buffer       - Pointer to a buffer structure of the
 *                                parameter
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to set the _SRS of an object contained
 *              in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 * Note: Parameters guaranteed valid by caller
 *
 ******************************************************************************/

acpi_status
acpi_rs_set_srs_method_data(struct acpi_namespace_node *node,
			    struct acpi_buffer *in_buffer)
{
	struct acpi_evaluate_info *info;
	union acpi_operand_object *args[2];
	acpi_status status;
	struct acpi_buffer buffer;

	ACPI_FUNCTION_TRACE(rs_set_srs_method_data);

	/* Allocate and initialize the evaluation information block */

	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
	if (!info) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	info->prefix_node = node;
	info->pathname = METHOD_NAME__SRS;
	info->parameters = args;
	info->parameter_type = ACPI_PARAM_ARGS;
	info->flags = ACPI_IGNORE_RETURN_VALUE;

	/*
	 * The in_buffer parameter will point to a linked list of
	 * resource parameters. It needs to be formatted into a
	 * byte stream to be sent in as an input parameter to _SRS
	 *
	 * Convert the linked list into a byte stream
	 */
	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
	status = acpi_rs_create_aml_resources(in_buffer->pointer, &buffer);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Create and initialize the method parameter object */

	args[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
	if (!args[0]) {
		/*
		 * Must free the buffer allocated above (otherwise it is freed
		 * later)
		 */
		ACPI_FREE(buffer.pointer);
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	args[0]->buffer.length = (u32) buffer.length;
	args[0]->buffer.pointer = buffer.pointer;
	args[0]->common.flags = AOPOBJ_DATA_VALID;
	args[1] = NULL;

	/* Execute the method, no return value is expected */

	status = acpi_ns_evaluate(info);

	/* Clean up and return the status from acpi_ns_evaluate */

	acpi_ut_remove_reference(args[0]);

      cleanup:
	ACPI_FREE(info);
	return_ACPI_STATUS(status);
}